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ESTATE MON BIJOU ST. CROIX, VIRGIN ISLANDS FINAL DETAILED PROJECT REPORT AND ENVIRONMENTAL ASSESSMENT SECTION 205 FLOOD CONTROL US Army Corps of Engineers Jacksonville District South Atlantic Divisicfl FINAL DETAILED PROJECT REPORT AND ENVIRONMENTAL ASSESSMENT FOR ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS DECEMBER 1987 ESTATE MON BIJOU/GLYNN ST. CROIX. U.S. VIRGIN ISLANDS SECTION 205 DETAILED PROJECT REPORT SYLLABUS The purpose of this study is to determine the feasibility of reducing flood damages and related problems in the Estate Mon Bijou and Glynn resi- dential areas of the island of St. Croix in the U.S. Virgin Islands. This study was conducted at the request of the Department of Public Works for the U.S. Virgin Islands. The report was prepared under the authority provided in Section 205 of the 1948 Flood Control Act. as amended. The u.s. Army Corps of Engineers has primary responsibility for conducting the study and preparing this report. The Mon Bijou and Glynn residential areas are located in the upper part of the Salt River watershed about 5 miles west of the city of Christiansted. St. Croix. A tributary to the Salt River. Canaan Gut. originates on the south slopes of the northern coastal mountain range of St. Croix. Canaan Gut drains the southern slopes of Blue Mountain and Mount Eagle before entering the Mon Bijou area at the base of the mountains. It travels through the Mon Bijou and Glynn areas before joining with another tributary to form the Salt River just below Glynn. The total drainage area of Canaan Gut is 2.5 square miles. of which only 0.87 square miles lie above the Mon Bijou area. However. due to heavy rainfall generated by the mountains and the steep slopes. flood flows are substantial with a 100-year flood flow of over 3.200 cubic feet per second (cfs) where Canaan Gut enters Mon Bijou. This combined with severe encroachment of the flood plain of the normally dry stream. has resulted in 96 homes being subject to flooding by a 100-year event. This would result in over $1.7 million in damages and related flood losses. Even a 2-year event produces over $340.000 in damages. Total average annual damages are estimated at $442.150. During the period 1975-1980. three major floods occurred in the area which caused widespread damage. To address these flood problems. several plans were developed and eval- uated to determine their effectiveness in reducing flooding and their overall economic. environmental. social. and other impacts. As a result of the investigations performed. a plan was developed which provides for the construction of a bypass channel around the developed portions of Mon Bijou and Glynn. This plan involves the construction of a grass-lined channel about 6.500 feet long. At the upstream end. a levee is included to help divert flows into the new channel. To control flow velocities in the chan- nel. thirty-four gabion-lined drop structures would be required. Additionally. two new bridges would be built to span the new channel. In all this plan would cost $3.6 million initially. or $338.000 annually. Annual benefits are estimated at $415.600. The benefit-cost ratio would be 1.2. Based on an analysis of overall economic. environmental. and social impacts, the above plan was found to be in the Federal interest and justified for implementation. Therefore. the plan is recommended for approval for Federal construction. --:·· DETAILED PROJECT REPORT AND ENVIRONMENTAL ASSESSMENT ESTATE MOM BIJOU ST. CROIX. u.s. VIRGIN ISLANDS TABLE OF CONTENTS Title Study Authority Study Purpose and Scope Prior Studies and Reports Study Participants Plan Formulation Study Area Description Existing Conditions · Future Conditions Problems. Needs. and Opportunities Planning Objectives Planning Constraints Possible Measures Initial Screening Alternative Plans Initial Evaluation Detailed Plans Assessment and Evaluation Trade-off Analysis Identification of NED Plan Plan Selection - The Selected Plan Plan Description Design and Construction Operation and Maintenance Accompli sl'unents Cultural Resources Mitigation Requirements Other Considerations TC-1 Page No. 1 1 2 2 2 2 3 6 6 1 8 8 10 12 15 17 19 33 34 '34 34 34 35 36 36 38 38 38 Rev 04/21/88 TABLE OF CONTENTS - Cont'd Title Plan Implementation Institutional Requirements Division of Responsibilities and Cost-Sharing Public Involvement Conclusions Recommendations Findings of No Significant Impact Environmental Assessment TC-2 Page No. .39 39 39 40 41 42 No. 1 2 3 4 5 6 7 No. 1 2 3 4 5 6 7 8 9 10 LIST OF TABLES Title St. Croix Population Flood Plain Evacuation Channel Modi fica ti on Plans Channel Bypass Plans Summary Comparison of Detailed Plans Proposed Plan Cost Estimate Cost Sharing LIST OF PLATES Title Study Area Selected Plan Plan Details Design Condition Profile Existing Condition-Flooded Area Pa~e No. 4 13 14 15 20 37 40 With-Project Condition-Flooded Area Non-Structural Alternative Concrete Culvert Alternative Open Channel Upper End - Alternative Cultural Resources TC-3 APPENDIXES Appendix A - Hydrology and Hydraulics . Appendix B Geotechnical and Materials Appendix c Recreation Appendix D Engineering, Design, and Cost Estimates Appendix E - Economic Analysis Appendix F - Cultural Resources • Appendix G Local Cooperation and Public Involvement TC-4 DETAILED PROJECT REPORT ON ESTATE MON BIJOU/GLYNN ST. CROIX, U. S. VIRGIN ISLANDS This report presents the results of investigations into flooding and related problems for the Estate Mon Bijou/Glynn areas of St. Croix in the U. S. Virgin Islands. The report was prepared in response to a request by the Department of Public Works, Virgin Islands, for assistance in reducing flooding in the Mon Bijou area. This area is a residential suburb of Christiansted and is subject to frequent and severe flooding. STUDY AUTHORITY This report was prepared under the authority provided by Section 205 of the 1948 Flood Control Act, as amended. Section 205 authorizes the Chief of Engineers to investigate and construct, within certain cost limitations, small projects for flood control when such work is found advisable. The advisability of constructing a project under this program is dependent upon a detailed investigation of the engineering, economic, and environmental aspects of the area and a determination of the Federal interest in such work. In general, a project must be in the overall public interest, complete within itself, engineeringly feasible, economically justified, and environmentally sound in order to be included in this program. Also, there is a limitation, currently $5 million, on the amount that the Federal Government can contribute to any one project. All costs in excess of that amount, as well as certain other costs, must be borne by local interests. STUDY PURPOSE AND SCOPE The primary purpose of this study is to investigate flooding and related problems in the Mon Bijou area, determine if feasible means for reducing these problems exist, and recommend the most appropriate course of action. In this regard, investigations were conducted in accordance with the procedures contained in the Water Resource Council's .. Economic and Environmental Principles and Guidelines for Water and Related Land Resources Implementation Study" (48FR10259). Because of the inherent limitations of the Section 205 program, studies were generally confined to the immediate study area of Mon Bijou. However, the investigations were of sufficient detail to identify those problems being experienced, determine probable future changes, identify and evaluate possible plans for addressing these problems, develop detailed plans for possible implementation, determine public support for such plans, and recommend a course of action as appropriate. -1- PRIOR STUDIES AND REPORTS Several studies have been conducted regarding flooding and related problems in the Mon Bijou area. The primary reports applicable to this study are: a. Reconnaissance Report of the Estate Mon Bijou, dated May 1980, prepared by the Jacksonville District, U. S. Army Corps of Engineers. This report was a prelude to this investigation and identified flood problems in the area as well as a need for further study. b. Post Disaster Report for Virgin Islands, dated 10 January 1978, prepared by the Jacksonville District to document the flooding and damage that resulted from a tropical wave (atmospheric condition) on 7-8 October 1977. This document identified significant flooding and damage in the Mon Bijou and Glynn areas. c. Cultural Resources Survey: Mon Bijou Project, St. Croix, V.I., dated 17 January 1984, prepared under contract to Jacksonville District to document the cultural resources in the study area as a part of this overall investigation. A summary of this report is contained in Appendix H. d. Flood Insurance Study U.S. Virgin Islands, Island of St. Croix, dated April 1980, prepared by the Federal Emergency Management Agency to identify flood-prone areas and establish various zones for flood insurance purposes. e. A Flood Damage Mitigation Plan for the U. S. Virgin Islands, dated June 1979, prepared by CH2M Hill Engineering to identify flood problems in the Virgin Islands and present possible solutions to these problems. STUDY PARTICIPANTS The Jacksonville District was t~e lead agency in the preparation of this report. Valuable information and assistance was provided by the Department of Public Works of the U. S. Virgin Islands, the State Historic Preservation Officer, the U. S. Fish and Wildlife Service, and other local and Federal agencies. PLAN FORMULATION STUDY AREA DESCRIPTION The primary study area is the Estate Mon Bijou and Glynn residential area which is located in the upper part of the Salt River watershed about 5 miles west of Christiansted. Christiansted is located on the north central coast of the island of St. Croix. This island is a part of the U. S. Virgin Island Territories and is located about 1200 miles southeast of Miamt, Florida and 80 miles southeast of San Juan, Puerto Rico (see plate 1). -2- I The Mon Bijou/Glynn area is a suburban residential area consisting of medium density, single family units located at the foot of Blue Mountain and Mount Eagle. It is drained by the Canaan Gut tributary of the Salt River. The drainage .basin of Canaan Gut covers about 2.5 square miles of which 0.87 square miles lie above the residential development. The terrain is very steep above the Mon Bijou area with elevations ranging from the Blue Mountain peak of 1165 feet above National Geodetic Vertical Datum (NVGD) to 200 feet NGVD at the upper end of Mon Bijou. Within the Mon Bijou area ele- vations range from 80 feet NGVD to 200 feet NGVD. A second tributary, Little Fountain Gut, drains into Canaan Gut from the east. It joins Canaan Gut just downstream from the start of Mon Bijou. Both streams are normally dry discharging only as a direct result of rainfall. EXISTING CONDITIONS The island of St. Croix is the largest of the 50 islands and cays that make up the Territory of the U.S. Virgirr Islands. It is 23 miles long and 1 to 6 miles wide. In all, it provides about 80 square miles of land area. These islands are part of the Caribbean Island chain that stretches from just east of the Florida coast to just east of the northeastern tip of South America. This string of islands form the boundary between the Atlantic Ocean and the Caribbean Sea. St. Croix is typical of these subtropical. islands displaying a sharply varying terrain and a very warm climate. It has a low mountain range that forms a spine along its length, a large coastal plain on its south shore and numerous smaller flat areas. The geological composition of the island primarily reflects its volcanic orgin in the ocean environment. It is characterized by a volcanic or limestone base overlain by alluvial clay, marl, and decomposed limestone. The Canaan Gut drainage basin displays this typical topographical and geological makeup with the upper basin having steep slopes of 35 percent and a relatively thin layer of clayey overburden with the volcanic base. This rapidly gives way to a deeper, more varied overburden as the slopes decrease at the Mon Bijou area and the alluvial fan develops. Top soils in this area are generally characterized as a clay loam of varying composition. The climate of the area is classified as subtropical with warm temperatures that range from a minimum of 67 degrees Fahrenheit to a maximum of 97 degrees. The mean annual temperature is 78.3 degrees. Despite the relatively warm climate and island setting, average annual rainfall is only 45.7 inches and varies widely from year to year. This is apparently due to the small size of the island which is not conducive to generating rainfall. Rainfall patterns also vary within the year with the largest amounts being received during September - December and the smallest amounts during February- March. This reflects the influence of tropical waves and disturbances on the island which occur primarily during the latter part of the year. On the island the distribution of rainfall varies significantly with the mountainous northern area and western end receiving the majority of the rain. Rainfall in the Mon Bijou area tends to be heavier than much of the rest of the island due to the proximity of the mountains. -3- As a result of the steep terrain and widely varying rainfall, vegetation in the study area tends to reflect a more drought resistant composition. The mountains with their steep slopes and heavier rainfall are covered with decidous and evergreen trees. These rapidly give way to upland grasses, thorn scrubs, and other drought resistant species at the Mon Bijou area. The only significant wetland area is located some distance away at the mouth of Salt River. Wildlife in the area is very limited, consisting of small birds and animals. There are no criticl habitats or species listed or proposed for listing in the primary study area. Two endangered species which may occur in the general area include the St. Croix ground lizard and the Virgin Islands tree boa. Land use in the Canaan Gut drainage basin is governed by the two very distinct topographical areas. The upper part of the basin with very steep terrain is sparsely developed and covered with natural vegetation. The lower part of the basin, beginning at Mon Bijou, is considerably less sloping which has allowed development of the area into residential and agricultural use. While agricultural use has been present since early settlement of the islands, the residential development has resulted from the more recent urban growth of the Christiansted area. Historically, the economy of St. Croix was based on the production of sugarcane and the transhipment of goods. However, these both declined in importance during the 1800's with accompanying decline in the economy and decrease in island population. Developmental pressures remained absent until 1930 when sugarcane reemerged as an important crop. However, it was not until 1960 that significant growth took place. During the period from 1960-1970 the population doubled and the economy turned to tourism as a major activity. This was accompanied by an expanding divergence in the economy with an increase in commercial and industrial activity. The result of this expansion and population increase was urban sprawl which fostered the development of suburban communities for the rising middle class. Table 1 provides information on the historical and projected population of St. Croix. Year 1970 1975 1980 1990 2000 2010 2020 2030 TABLE 1 ST. CROIX POPULATION -4- Population 35,945 36,131 49,725 52,260 54,926 57,727 60,670 63,763 The Mon Bijou area is a typical example of the economic activity on St. Croix. It is primarily a medium density, middle class neighborhood comprised of single family, privately owned homes. Much of the commercial activity is located in the Christiansted area and most of the r~on Bijou residents commute to work. Mon Bijou is a typical residential subdivision with paved' streets and houses arranged in orderly fashion. Downstream in the Glynn area, development is more random and less dense. Below the Glynn area another major tributary, Bonne Esperance joins canaan Gut to form the Salt River. At this point the watershed becomes somewhat flatter with a more pronounced flood plain. As such, the flood plain is less developed with considerably more natural vegetation rimmed by agricultural develop- ment. As noted earlier, the distribution of rainfall in the Mon Bijou area varies widely during the year. It is characterized by long, dry seasons with intermittent periods of high intensity rainstorms. The more intense storms generally result from tropi ca 1 disturbances that move across the area. These dump large volumes of rainfall over relatively short periods of time. Estimates of potential rainfall for various return frequency rainfall events in the study area were taken from the U.S. Weather Bureau's Technical Paper No. 42 and No. 25 for Puerto Rico and the Virgin Islands. Based on this data, a storm with a return period of once every 100 years would generate a six-hour total rainfall of nine inches. A similar storm of 12-hour duration would generate 12 inches of rainfall. By comparison, the storm that struck the Mon Bijou area on 7 October 1977, resulted in a total 12-hour rainfall of 12 to 14 inches. The most extreme events recorded in the general area involved a storm which produced a total of 23.7 inches of rainfall over a 24-hour period at American Hill on St. John Island, and another that produced 15.5 inches at Estate Charlotte Amalie on St. Thomas. Thus, significant events do occur in the study area which generate large volumes of rainfall over relatively short periods of time. As a result of the intermittent occurrence of rainfall in the study area most of the stream channels are normally dry discharging only during periods of rainfall. Therefore, ground water is often used as the primary source of water supply. Also, the normally dry state of the stream channels belie the runoff that may be conveyed during periods of intense rainfall. In the Canaan Gut Basin, this problem is particularly acute due to the extremely steep nature of the upper basin. This steep slope combined with the soil characteristics yield a short concentration time and relatively high runoff rate. This combined with the intense rainfall that occurs yields a flashflood effect in the r~on Bijou area. This is readily exhibited in the upper part of Canaan Gut by an average lag time of less than 30 minutes. Thus, even with a drainage area of only 0.87 square miles above Mon Bijou, the estimated 10-year frequency flood discharge is in excess of 1800 cubic feet per second (cfs) while the 100-year frequency flood discharge is in excess of 3270 cfs. Not only are the flows considerable, but the flow velocity is also high due to the steep slope of the basin. Even in the flatter Mon Bi jou/Glynn area the channel velocity is sti 11 8-10 feet per second under flood conditions. -5- Flood stages in the area, while dependent on the magnitude and velocity of flow, also greatly reflect the condition of the channel. Previous runoff has established a water course through the area to the Salt River. For the most part this water course reflects the topography, soil composition, and high velocities, i.e., it is a fairly well defined channel with rocky bottom and sides. However, the aevelopment associated with Mon Bijou has greatly altered this condition near the center of the Canaan Gut basin. Tw.o roads cross the normally dry channel just above the Mon Bijou residential area. Both have small culverts which pass only minimal flow. Therefore they are frequently overtopped forcing water up and out of the channel. Just downstream of these two roads at the residential area, the stream is diverted into a 700-foot-long, four-foot by six-foot box culvert. Again, · the carrying capacity of this structure is so small that much of the storm runoff is forced up and out of the stream channel. However, at this point the overflow enters the residential area and floods homes, streets, cars, and other property. The flood problem in this area is compounded by the confluence of Little Fountain Gut. The channel for this subbasin is less well defined, even above Mon Bijou. However, as it enters the residential area, it flat- tens out and becomes completely obscured with no drainage course through the area. Thus, all of its flow is haphazard through the housing area until it reaches the Canaan Gut channel downstream of the culvert. At this point, the flow from both Canaan Gut and Little Fountain Gut is concentrated back in the channel area. The steep slope and well defined channel through the remainder of the residential area contain some of the runoff within the immediate channel area. At the lower end near the beginning of the Salt River portion the slope flattens to generate higher backwater with a corresponding widening of the flood plain and flooded area. FUTURE CONDITIONS Because of the nature of the steep terrain in the Canaan Gut drainage basin above the Mon Bijou area, little additional development is expected. Therefore, no increases are expected in runoff from the upper basin. Development within the Mon Bijou/Glynn area is expected to continue. However, this development should be either located outside of floodprone areas or at least compatible with the flood hazard. Therefore, no increase is expected in the amount of property subject to flooding. PROBLEMS, NEEDS, AND OPPORTUNITIES In the Mon Bijou/Glynn area there are 31 houses subject to flooding from a 2-year frequency flood. This increases to 96 houses for a 100-year flood. As such, a 2-year flood would produce over $344,000 in flood damages while a 100-year flood would generate $1.7 million damage. Average annual damages amount to $442,150. In addition to the monetary damage. the nature of the flooding endangers residents of the area. As noted earlier, there is only a 30-minute lag time for the watershed above Mon Bijou. Thus, within that time a heavy rainstorm can send a 4 to 6 feet deep torrent through the -6- residential area. Under these conditions, there is a substantiaT and sign_ificant threat to the safety of the Mon Bijou residents. The frequency of flooding of the r~on Bi jou area compounds the problem of severe flooding. From 1975-1980 the area was subjected to three significant floods. The flood in October 1977 was by far the worst with an estimated return frequency in excess of 100 years. As~a result of the significant and frequent flooding of the area, many of the more flood-prone homes- have been periodically abandoned. However, because of the need for housing and the disarming appearance of the dry streambed, reoccupancy by others occurs quickly. From the previous description of the area and the flooding experienced, it can be readily seen that the flood problems are primarily the result of encroachment into the flood plain and obstruction of the fl~od flow by inadequate facilities. Given the nature of the flooding with significant damage and threat to human life. there exists a definite need for measures to reduce the flooding or its effects on the area. There also exists a substantia 1 opportunity to enhance the economic status. safety, and genera 1 well-being of the Mon Bijou community through the reduction of flooding in the area. PLANNING OBJECTIVES In order to determine a potential solution to water resource related problems such as those described above, it is necessary to identify the objectives that any such solution should strive to attain. The Water Resource Council•s (WRC) Principles and Guidelines (P&G), noted earlier, provide the national objective for all water resource related studies. SpeCifically, the study should strive to develop plans that enhance. or make positive contributions to National Economic Development in a manner that is consistent with protection of the environment. For the Mon Bijou study area this can be refined to objectives which address the specific problems of the a rea , name 1 y : a. Reduce flood damages and other related costs in the Estate Man Bijou and Glynn areas; b. Restore, enhance, and/or preserve environmental attributes of the area; c. Enhance recreational opportunities in the study area; d. Reduce hazard to life and property due to flooding in the study area; and e. Protect, preserve, or minimize impacts on significant historical and cultural resources of the study area. -7- PLANNING CONSTRAINTS While the above planning objectives describe the goals of the study, there are certain limitations which must be considered in evaluating any plan for possible implementa-tion. The primary constraint that must be • considered is the overall scope of the study. As noted earlier, this investigation is being conducted under the Continuing Authority Program as provided by Section 205 of the 1948 Flood Control Act, as amended. As noted in the authorizing legislation, this program specifically addresses small projects for flood control. Therefore, any study conducted under this program should be primarily for flood control and be of a more localized or limited nature. Basinwide or regional studies are beyond the scope and intent of this program. Based on this constraint, the study was directed primarily at flood control for the r~on Bijou/Glynn area. Study investigations were then conducted only to the level of detail necessary to define and quantify the flooding and related problems and identify the most appropriate plan for addressing these problems. Additional constraints relate to various laws, Executive Orders, directives, and regulations which govern the investigation of water resource problems. Of these, two Executive Orders, 11988 governing Flood Plain Development and 11990 concerning conservation of Wetland areas, provide specific criteria which must be addressed by any proposed action. E.O. 11988 requires consideration of 4 specific criteria. Namely: * Avoid development in the base flood plain (100-year) except where it is the only practical alternative. welfare. * Reduce the hazard and risk associated with floods. *Minimize the impact of floods on human safety, health, and * Restore and preserve the natural and beneficial value of the base floodplain. POSSIBLE MEASURES In light of the above objectives and overall study constraints, the possible measures that were initially considered were directed primarily at the problem of flooding in the Mon Bijou/Glynn area. These include: a. No action b. Flood warning c. Floodproofing d. Flood plain evacuation e. Clearing and snagging f. Levees -8- g. Retention/detention reservoirs h. Channel modifications i. Streamflow diversion The "no action" alternative represents the expected future conditions of the area in lieu of implementation of any of the other above plans. It provides the baseline conditions against which all effects and impacts may be measured. It is carried through the entire planning process as a selectable option should studies fail to identify a more feasible and implementable alternative. Under this alternative flood plain zoning is assumed to be in effect. Thus, future development is assumed to be either in areas without flooding or to be compatible with the flood hazard. Flood warning is used primarily to provide residents of flood-prone areas an opportunity to prepare for an impending flood. It is very useful to alert such residents of approaching storms that may generate flooding or on large watersheds, to warn of flood waters that are moving toward a particular area. Floodproofing can be used to modify existing flood plain development to make it more compatible with the flood hazard. Generally, this is accomplished by elevating structures above flood levels, providing ring levees, or dikes, or waterproofing a structure~ Flood plain evacuation involves the removal of damageable property from the flood prone area. This can be done by moving the house or structure to another location or by demolishing the existing structure and rebuilding elsewhere. Evacuation thus restores the flood plain to original condition allowing it to function as an overflow storage area. Clearing and snagging can be used on streams that have obstructions to flow. Such obstructions retard the streamflow causing a decrease in velocity and an increase in water levels. This is very useful for areas where vegetation may clog the channel, old trees or debris may fall or be blown or discarded into the channel, or low velocities are insufficient to maintain a well defined and efficient channel. In such cases clearing and snagging can be used to increase flow rates and reduce flood levels. Levees generally involve either earthen or concrete walls which block water movement into certain areas. Thus, they reduce the extent of area subject to flooding and the property subject to danger. In this manner, the flood plain is altered to be more compatible with existing or planned development. Occasionally, training levees may be used along either or both sides of the stream to confine flood water to the stream area or floodway. In reducing the extent of flooding and the flood plain, levees also reduce available storage and can cause an increase in flow rate and flood level. Therefore, the usefulness depends a great deal on the topography and other physical characteristics of the area. -9- Flood retention/detention reservoirs can be used to temporarily store flood waters above flood-prone areas, thus reducing the downstream flow volumes and flood levels. Later, the flood waters can be released at a controlled rate to minimize the downstream effect. The usefulness of such reservoirs is very dependent on the physical characteristics of the upper watershed and the status of development within that area. Channel modification can be used to alter the existing stream channel and increase its carrying capacity. This is usually acomplished by excavating to make the stream channel either wider or deeper or both. This increases the velocity and flow rate of the floodwaters thereby reducing flood levels and the extent of flooding. The magnitude and extent of the effect of channel modification on flooding is directly dependent on the extent of excavation, the larger the channel the greater the reduction in flood levels. However, since flood plain storage in the channelized area is reduced and flow velocities are increased, downstream flooding may actually be greater due to greater flow rates and hydrologic regime alteration. Thus, the usefulness of this measure may depend on downstream conditions as well. Stream flow diversion can be used to redirect flood waters around a particular area. This precludes their entry into the problem area thereby greatly reducing the flood prob 1 ems of that area. This is often accomplished by constructing a secondary channel bypass around the problem area to connect at some downstream point or to another drainage course. The effectiveness of this measure is thus very dependent on the physical setting and characteristics of the area. INITIAL SCREENING In order to develop alternative plans for the Mon Bijou area it was necessary to examine each of the above possible measures in light of its specific applicability to the problems at Mon Bijou. In this manner, plans could be developed that incorporate features applicable to the specific problems being experienced. As noted earlier, the "no action" measure provides the basis of the without project conditions for the study area. Therefore, it was carried through the evaluation process as the "No Action Plan". Flood warning in the Mon Bijou area is based solely on prediction of excessive rainfall. Because of the small basin size and short lag time, there is no warning of approaching flood water. Thus, flood prediction is indirect depending on the accuracy of meterological forecasts of rainfall volume and intensity. Based on the nature of flooding experienced, this is generally good only for significant atmospheric disturbances such as tropical depressions. Even for these, the residents can only remove themselves and readily transportable belongings to areas of relative safety. Little can be done to protect the houses from the flood waters. Thus, while this measure is good for protecting life and some property, it is not -10- ' considered adequate for effectively reducing flood damges in the area. For this reason, it was not considered further in this study even though it should be continued and enhanced at the local level to protect life in the area. Floodproofing was reviewed based on the physical characteristics of the Mon Bijou area. The nature of the flooding, i.e., rapidly rising flood waters with high velocity, make floodproofing by structure raising or waterproofing undesirable. With the high velocity flows, there is some danger of potentia 1 structura 1 collapse due to the water force on the structures. Also, the need for emergency evacuation may actually increase due to the perceived protection provided which results in people remaining in houses too long and thus becoming trapped. The extent and density of development preclude the use of ring levees as a possible measure for reducing flood damages. Therefore, the alternative of floodproofing was not considered further in the analysis. Flood plain evacuation can be used in the Mon Bijou area to remove the more flood-prone structures from the area. This would tend to restore the flood plain area to a low or no damage floodway. The current residents would be relocated to property elsewhere thus protecting them from future floods. The homes would be permanently removed thus preventing further flood damage or future re-occupancy. Since implementation of this measure is potentially feasible for the r~on Bijou area, it was retained for more detailed consi deration. Clearing and snagging in the main problem area of Mon Bijou was not deemed appropriate since much of the flood problem stems from insufficient culvert capacity at Mon Bijou. Below the culvert, the natural channel is maintained in reasonably good condition by the high velocities, even though vegetation has overgrown the channel in some areas. Because of the large volume of flow, additional clearing or debris removal would not significantly alter flood conditions. Therefore, this measure was not considered further. Levees could be used in the Mon Bijou area to channel flood flows around housing areas where topography would permit. In examining the Mon Bijou topography there appears to be only one area where a levee could be used, that is near the Little Fountain Gut drainage entrance into Mon Bi jou. A levee could be used there to divert runoff from Little Fountain Gut away from the houses. Elsewhere, along the Canaan Gut Channel, the density of development, nature of flooding, and topography generally preclude the use of levees as a singular solution. Also, the levee diversion at Little Fountain Gut would have to be accompanied by additional Canaan Gut channel work to reduce overall flood levels at Mon Bijou. Therefore, levee construction was only considered in combination with other structural measures for the area and generally as a flow diversion action. Where warranted it was included with other plans as discussed below. The potential of flood retention/detention reservoirs in the Mon Bijou area is dependent on the upstream basin size, shape, and other physical -11- L characteristics as well as the volumes of runoff expected. As previously noted, the drainage area above Mon Bijou is very small. However, the slopes are steep and the runoff rates are high. This combination of features precludes the use of an upstream storage reservoir. The large volumes of runoff and 1 imi ted capacity of any site yie 1 d poor conditions for upstream storage possibilities. Therefore, no plans were developed and this measure was dropped from further consideration. Channel modification can be used at Mon Bi jou to enlarge the channel through areas where natural or manmade features obstruct or retard flow causing higher flood levels. Upstream of the Mon Bijou area there is a relatively well defined channel with little development which obviates any need for enlargement or modification of the channel. At Mon Bijou the original channel has been replaced by a small box culvert through the upper part of the housing development. This culvert is grossly inadequate for handling flow from Canaan Gut. Either culvert enlargement or removal would signific~tly reduce flood levels in the area. Downstream of the culvert, ~he natural channel resumes with a significant carrying capacity. Although flooding in this downstream area is still a problem, it is not as severe as the upstream culvert portion. Therefore, since channel enlargement in the upper Mon Bijou area does appear to offer a potential solution to the flood problem being experienced, it was retained for more detailed consideration. As noted earlier, streamflow diversion is practical where topography and other conditions permit the construction of bypass channels around problem areas. In the r~on Bijou area the more concentrated development is found in the Mon Bijou/Glynn residential area. The area surrounding the housing area is largely open farm land. While the topography can still be classified as rolling, it is similar to the housing area and could support a bypass diversion plan. By diverting flow from Canaan Gut and Little Fountain Gut away from Mon Bijou the flooding and associated damage could be greatly reduced. The CH2M Hill report noted earlier identified a diversion plan as a feasible solution to flooding in the Mon Bijou area. Therefore, it was retained for more detailed analysis. Thus, of the possible measures initially considered, only evacuation of the flood plain, channel modification, and stream flow diversion appear to offer any potentially feasible solution to the flood problems at Mon Bijou. The "no action" alternative was also retained for comparative purposes as well as possible recommendation. The other possible measures were dropped from further consideration or combined as special features of those measures retained as noted above. ALTERNATIVE PLANS Based on the initial screening above, alternative plans were developed for those possible measures that were identified as being potentially feasible for implementation in the Mon Bijou area. The "no action" plan ·represents the without project conditions for the future should all of the other alternatives prove to be not implementable for economic, -12- I environmental, institutional, or other reasons. Under this alternative periodic and devastating floods would continue to strike the area, From past experience, it is assumed that the accompanying cycle of periodic abandonment of the mort severely damaged houses would follow significant flood events. As in the past, it is anticipated that reoccupation of the abandoned structures would occur during prolonged flooa- fret periods. Therefore, the flood damage potential is expected to remain for the current development in the flood plain. However, considering the unsuitable nature of the upper Canaan Gut Basin for development due to the steep'terrain, any increase in flood levels due to increased runoff is unlikely. Also, with proper enforcement of flood plain zoning regulations, there should be only minimal increase in the overall damage potential of the area due to control of future development of flood-prone areas. Therefore, average annual flood damages are expected to continue at $442,150. Evacuation of the flood plain could be used to reduce these damages by removing the flood-prone structures from the flood plain. Considering the type of construction, evacuation in the Mon Bijou/Glynn areas would involve the relocation of the occupants to another dwelling and the demolition and removal of the house. In Mon Bijou several levels of evacuation were analyzed based on frequency of flooding. Estimated benefits were based on the externalized costs res~lting from flooding, i.e. those costs borne by non flood plain residents. Estimated implementation costs include the purchase of the structure and land, relocation of the residents, demolition of structure, and clearing and restoration of the site. Table 2 presents a summary of estimated costs and benefits for different levels of evacuation. TABLE 2 FLOOD PLAIN EVACUATION NUMBEA OF EXTERNALIZED ESTIMATED ANNUAl NET BC LEVEL STRUCTURES ANNUAL BENEFITS FIRST COSTS COSTS BENEFITS RATIO 2-Yr 31 $248,120 $2,579,180 $245,370 $ 2, 750 1.01 5-Yr 40 340,200 3,270,500 310,850 29,350 1.09 10-Yr 47 350,700 4,027,890 364,630 -13,930 0.96 25-Yr 64 355,320 5,114,080 485,470 -130,150 0.73 The above table indicates that the 2- and 5-year levels of evacuation are economically feasible. These would involve the removal of the more flood-prone houses in the Mon Bijou and Glynn areas. This would not reduce actual flooding in the area, only the damage sustained. Channel modification could be used to reduce the actual flood levels in the Mon Bijou area thereby reducing damages resulting from these floods. ln analyzing possible schemes for channel modification for the upper Mon 81jou ar·ea two approaches appeared feasible; -13- ... a. To replace the existing box culvert with a larger culvert and improve inflow and exit conditions, and b. Restore the original ch~nnel by removing sOme houses and excavating a channel through the area. _ ~ . . · To handle the flow from little Fountain Gut a small diversion channel with bordering levee could be provided to divert water directly to the Canaan Gut Channel. This would eli~inate the overland-flow flooding frO. this tributary. Benefits attributable to either of these two plans would be a direct result of reduced flooding in the area. Table 3 below shows the average annual benefits . and costs for each plan. Channel modification in the lower part of the Mo~. Bijou/Glynn area was not economically feasible. Therefore, it was not · included in any of the shown plans. TABLE 3 CHANNEL MODIFICATION PLANS ANNUAL ESTIMATED ANNUAL PLAN BENEFITS FIRST COSTS COSTS Enlarged Culvert $382,720 $3,675,000 $335,640 Open Channel $378,320 $3,623,450 $330,300 NET BENEFITS $47,080 $48,020 B-C RATIO 1.14 1.15 As shown in Table 3 both plans represent economically feasible solutions to the flood problems by reducing flood levels in Mon Bijou. In analyzing possible schemes for streamflow diversion at Mon Bijou, consideration was initially given to the diversion plan presented in the CH2M Hill report. This provides a bypass channel extending from Canaan Gut just upstream of Man Bijou, around the north side of the housing area, intercepting Little Fountain Gut, and rejoining Canaan Gut downstream of the Glynn area at the beginning of Salt River. Several variations of the basic plan were analyzed which included different channel sizes and linings, levee diversions, drop structures, and instream detention ponds for water control. Included within these variations was the possible use of roller compacted concrete (RCC) which was evaluated to determine the feasibility of this measure based on its constructibility. This option was not found to be a viable alternative during the evaluation process and was discontinued. Table 4 below presents a summary of the economics for some of the plans con- sidered. As noted in the table, only one bypass plan is considered to be economically feasible. Therefore, only that plan was retained for further consideration. The bypass plans were formulated in accordance with paragraph 3-4, b.(l) of ER 1105-2-20. The division levee was designed to the SPF level to prevent a catastrophic event should it be overtopped. Due to the extremely steep gradient, the bypass channels were designed for hydraulic integrity to prevent the loss of velocity controls by flows bypassing them out of bank. The existing drainage system through Estate Man Bijou and Glynn is adequate to handle runoff from the drainage area downstream of the division with minimal damage. For levels of protection less than that provided by the considered bypass plans, a structure would be required through the diversion levee to allow flow to continue through the developed area. This would increase the costs of the diversion alternatives while reducing the benefits, therefore the plans did not consider these alternatives and the bypass plans are considered to be optimized as described above. Rev. 4/88 -14- '~ ·- •. e TABLE 4 CHANNEL BYPASS PLANS ANNUAL FIRST ANNUAL NET B-C PLAN BENEFITS COSTS COSTS BENEFITS RATIO Concrete Bypass $415,800 $8,225,000 $720,920 -305,120 0.6 Gabi on Bypass $415,800 $4,950,000 $443,870 - 28,070 0.9 (Completely lined) Earthen Bypass $415,800 $5,355,000 $476,700 - 60,900 0.9 (w/sheet pile drop) Earthen Bypass $415,800 $3,667,800 $338,000 $77,800 1.2 (w/Gabion drop) INITIAL EVALUATION The alternative plans discussed above were evaluated to determine significant impacts and identify major areas of concern that would be useful in the development of detailed plans. Potential impacts were assessed in terms of anticipated economic, environmental, social, and other changes in the without project condition that would result from the implementation of the considered alternative. As discussed earlier, the "no action" plan represents the without project conditions for the future. Under this con- dition the present flooding would continue with average annual damages of $442,150. The economic well-being of the area would suffer because of this continuing damage. Given the availability of flood insurance, the monetary losses from flooding would be largely borne by persons outside the Mon Bijou area. This adversely affects economic activity at the territory and national level. Locally borne costs would continue to adversely affect the flood plain residents and local government agencies responsible for emergency duty and cleanup. Continued flooding would also discourage property improvement or upkeep thereby depressing normal affluence-related increases in economic levels for Mon Bijou. Environmentally, continued "no action" would have negligible impacts on existing conditions. The Mon Bijou natural environment has been substantially altered by the previous activities of man. There are no present plans to alter this condition. Future development of the area would probably be characterized by the continued conversion of farm lands to resi- dential and commercial areas. However, no significant or outstanding environmental attributes were noted in the immediate Mon Bijou area that would be affected by this continued growth. Aesthetically, the area would suffer adverse side effects from the flooding primarily due to the house and yard damage and deterioration or lack of upkeep during periods of abandon- ment. Other significant impacts of continued no action would relate to the safety and overall well-being of the area residents. As discussed earlier, the area is subject to flash-flooding. This poses a continuing threat to ~ life of the flood plain occupants. Although no loss of life has yet been -15- reported, the threat and potential are significant under the existing flood conditions. This constant threat would continue to have a demoralizing effect on the residents adversely affecting their general well-being. The flood plain evacuation alternative would reduce the flood damages being experienced by removing the structures from the flood hazard area. Since most of the current damages are borne outside the flood plain, a reduction would be of widespread benefit. The costs associated with removal of these structures would also be borne by non-flood plain residents. This would be a widespread detriment. However, since the benefits exceed the costs for the 2- and 5-year levels of evacuation (Table 2), the overall effect would be beneficial. Locally, the construction effort would have a minor, temporary beneficial impact on the area. Environmentally, evacuation would provide potentially beneficial though minor impacts for the area. Removal of the structures and replacement with green areas could have a beneficial effect if properly maintained. Assuming replacement property was required elsewhere, the net effect for the island would probably be negligible. There would be some minor temporary adverse effects associated with the construction effort. These should cease shortly after completion of construction. Other impacts would be primarily related to the relocation of the residents. While the overall safety and well-being of those evacuated would be improved, there would be other varying effects that would depend on individual circumstances, e.g. movement away from friends or relatives, jobs, etc. and disruption of established neighborhood. Channel modification would also reduce flood damages in the area. However, in this case, it would result from an actual reduction in flooding. This would be beneficial to both flo~d plain and non-flood plain residents. Costs of construction would adversely impact primarily non-area residents. However, as shown in Table 3, the benefits outweigh the costs. Therefore, the net impact would be beneficial. As with evacuation, there would also be some minor, temporary beneficial impacts on the local economy due to the construction effort. The environmental effects of channel modification in the Mon Bijou area would be generally minor. As noted earlier, the original stream channel in the primary problem area has been replaced by a concrete culvert. The culvert modification plan would have temporary adverse impacts during construction. Otherwise, the constructed facility would be similar to the existing one. The open channel plan would restore an open stream channel through the area. It would have adverse impacts during construction. However, long-term impacts would tend to be beneficial due to the reestablishment of an open channel. Other impacts of channel modification would be primarily beneficial, related to the reduction in flooding, flood damage, and threat to life and safety. -16- Only one of the stream flow diversion plans was found to be economi- cally feasible. This plan would involve the construction of a bypass chan- nel around the northern side of the Mon Bijou and Glynn areas. This channel would be grass-lined and have 34 gabion-lined drop structures to control flow velocities in the channel. The bypass channel would begin just upstream of the Mon Bijou area and end at the Salt River just downstream of the Glynn area. This plan would reduce flood damages in the area by diverting the flood waters away from the developed areas. This reduction in flood damages would have a beneficial effect on area residents as well as the general economy. Construction costs would have an adverse effect on primarily non-flood plain residents. However, since the reduction in flood damages is greater than the costs required to achieve that reduction, the effect on the economy would be beneficial. Other economic impacts would be related to the minor, though temporary, beneficial impacts on the local economy due to the construction effort. Environmentally, this alternative would have generally adverse, though minor impacts. Existing vegetation along the construction right-of-way would be destroyed. This would be replaced by a grassed area which would be periodically mowed. Other impacts would be minor. Social impacts would be mainly related to the reduced flooding and improved safety and well-being of area residents. This would have a signi- ficant beneficial impact on local residents. DETAILED PLANS In reviewing the alternative plans discussed above, four main plans, in addition to the "no action" plan, appear to warrant a detailed investigation: a. Flood plain evacuation; b. Construction of new culvert through upper portion of Mon Bijou; c. Channel modification through the upper portion only; d. Channel diversion around the developed areas. Since two economically feasible levels of evacuation exist, the economically optimum level, 5-year, was chosen for detailed analysis. The two upper portion only channel modification plans were both retained for detailed analysis due to their significantly different designs and economic feasibility. The flood plain evacuation plan (plan A) would remove all structures within the 5-year flood plain. This involves 35 houses in Mon Bijou and five houses in the Glynn area (see plate 7). Implementation of this plan would require the purchase of the land and improvements from the then current owners. Relocation assistance would be provided to the occupants in accor- dance with the provisions of Public Law 91-646. When the structures are empty, all salvageable equipment would be removed and the structures demo- lished. The area would be cleaned and replanted as necessary to provide an acceptable appearance. -17- In all, this plan would initially cost about $3.27 million. On an annual basis, at 8-5/8% interest for 50 years, the total cost would be $310,850. Average annual flood damages would be reduced from $442,150 to $84,150. Annual benefits would be the externalized (national level) reduction in costs. This is approximated by the total flood damages eliminated ($358,000) less the costs borne by flood plain occupants ($11,300 for flood insurance premiums and $7,320 for deductible losses). Costs associated with administration ($800) are added in. The result amounts to $340,200 annually. This yields a net annual benefit of $29,350 and a benefit to cost ratio of 1.09. The culvert enlargement plan (Plan B) actually would involve the construction of a new culvert adjacent to the existing culvert (see plate 8). The existing culvert would be left in place. This plan would include a diversion channel and levee to intercept flow from Little Fountain Gut and direct it to Canaan Gut. Also included would be two new concrete bridges with paved approaches, a debris basin, a gabion-lined approach channel, a 10-by-15-foot reinforced concrete box culvert 512 feet long with stilling basin, and a gabion-lined exit channel. A construction easement would be needed to install the box culvert while areas of the open channel, levee, and debris basin would have to be acquired. No relocation of houses or other structures would be required under this plan even though minor utility and street work would be required. Periodic maintenance would also be required to remove debris from the debris basin, maintain the gabion lining, and maintain the levee and access areas. It should be noted that this plan involves a high velocity (>20 feet per second) culvert. Therefore, the debris basin is very important to the proper functioning of the works. In all, this plan would initially cost about $3.7 million. On an annual basis, at 8-5/8% interest for 50 years, the cost would be $335,640. Annual benefits would result from the reduction in flooding. Average annual damages would be reduced from $442,150 to $59,430 resulting in an annual benefit of $382,720. This yields a net benefit of $47,080 annually and a benefit to cost ratio of 1.14. The open channel plan (Plan C) involves the reestablishment of an open channel through the upper Man Bijou area. A channel would be excavated as shown on Plate 9. A diversion plan for Little Fountain Gut would be included to direct the flow to the new channel. Plan C would require the removal of six houses along the new channel right-of-way. These would be acquired, the occupants relocated, and the structures removed to permit construction of the channel. The main channel would be trapezoidal with a bottom width of 20 feet and side slopes of one vertical to two horizontal. The sides and bottom would be grassed to reduce erosion. Seven steel sheet pile drop structures would be provided to reduce velocities in the new chan- nel reach. Each structure would lower the channel grade about six feet. The total length of the new channel would be about 1800 feet. Two new bridges would be required to span the new channel. One local street would be barricaded. -18- In all, this plan would initially cost about $3.6 million. On an annual basis, the cost would be $330,300. Annual benefits would result from the reduction in average annual flood damages from $442,150 to $59,430. Since six houses would be relocated, some damage reduction benefits would be lost due to externalization. Average annual benefits are thus estimated at $378,320. This would yield net benefits of $48,020 and a benefit to cost ratio of 1.15. Plan 0 involves the construction of a 6,500-foot-long bypass channel around the northern side of Mon Bijou and Glynn. This channel would begin at the roadway upstream of the Mon Bijou area and travel through the undevel- oped areas in an easterly direction. A levee on the southern side of the new channel would divert runoff into the new channel. The new channel and levee would also intercept water draining from Little Fountain Gut. This diversion channel would follow the n~tural ground slope through the existing dam which would be removed. It would then rejoin the Canaan Gut channel at the headwaters of the Salt River just downstream of Glynn. The diversion channel would be trapezoidal with a bottom width of 75 feet and a side slope of 3 horizontal to 1 vertical. Channel depth would vary w~th topography but generally range 8-12 feet. To control flow velocities in the channel, a series of 34 gabion-lined drop structures would be placed along the channel. Each would lower the water some 3-4 feet. The main channel would be grass lined between the drop structures. Two new bridges would be required for the channel as well as the removal of at least 3 houses in the lower portion of Glynn. In all, this plan would cost about $3.8 million. On an annual basis, this would amount to $338,000. Annual benefits, which would result from a reduction in flooding would amount to $415,800. This would yield a benefit- cost ratio of 1.23 and net benefits of $77,800. ASSESSMENT AND EVALUATION In order to determine the most appropriate plan for implementation in the Mon Bijou area, the detailed plans presented above were evaluated in light of their overall accomplishments and effects. To facilitate comparison these were evaluated only in light of the net change to the without project conditions that would be experienced under the uno action'' plan. Table 5 shows a summary comparison of the four detailed plans. -19- PLAN A ITEM EVACUATION A. Plan Description 1 • Major Features Removal of 40 houses from 5 year floodplain InMon Bljou and Glynn area. 2. First Cost $3,270,500 B. Accomp II shments 1 • Reduce f I ood Reduces damaqes to those Damaqe houses removed. N 0 2. Enhance Restores II ml ted area to Environment more natural condition. 3. Enhance Recreation No enhancement. 4. Reduce F I ood Reduces flood damaqe. Does Hazard not reduce hazard of flooding to remalnlnq houses. 5. Protect, No enhancement. Enhance Cultural Resources • TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS PLAN B PLAN C CONCRETE CULVERT OPEN CHANNEL Construction of new culvert Construction of an open In upper portion of Mon Bljou. channel through upper portion of Mon Bljou. $3,675,000 $3,623,450 Reduces flood dama9es In upper Reduces flood damaqes by portion by reduclnq flood reduclnq flood levels In levels. upper portion. No enhancement. No enhancement. PLAN D DIVERSION CHANNEL Construction of a new diversion channel around the northside of the area. $3,667,800 Reduces flood damaqes by reducing flood levels In Mon Bljou and Glynn area. No enhancement. Reduces floodlnq In area. Reduces flooding In area. Significantly reduces flooding In area. Reduces flood hazard by lowerlnq flood levels. No enhancement. e R~uces flood hazard by Reduces flood hazards lowering flood levels. by diverting flow. No enhancement. No enhancement. • ITEM c. N - • SIGNIFICANT IMPACTS: PLAN A EVACUATION e TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS PLAN B CONCRETE CULVERT 1. National Economic Development a. b. c. d. 2. a. Annual Benefits Annual Costs Net Benefits B-C Ratio Environmental Quality Beneficial Impacts 1) Manmade Resources 2) National Resources* 3) Air Quality* 4) Water Quality* 5) FIsh and W II d II fe 6) Archaeological and a. $340,200 b. $310,850 c. $ 29,350 d. 1.09 Nl Nl Nl Nl Nl Nl a. $382,720 b. $335,640 c. $ 47,080 d. 1.14 Reduces flood damage along stream by reducing overall f I ood I eve I s. Nl Nl Nl Nl Nl Historical Sturctures 7) Aesthetics* 8) Nolse* Enhanced through removal of Reduced f food I nq wou I d more frequently damaqed homes. encourage better upkeep of area. Nl Nl PLAN C <PEN a-IANNEL a. $378,320 b. $330,300 c. $ 48,020 d. 1.15 Reduces flood damage along stream by reducing overal I flood levels. Nl Nl Nl Nl Nl Reduced f I ood I ng wou I d encourage better upkeep of area. Nl e PLAN D DIVERSION CHANNEL a. $415,800 b. $338,000 c. $ 77,800 d. 1 .23 Reduces f I ood damage a I ong stream by reducl ng overal I flood levels. Nl Nl Nl Nl Nl Reduced f I ood I ng wou I d encourage better upkeep of area. Nl ITEM b. Adverse Impacts 1) Manmade Resources* 2) Natural Resources* 3) A I r Qua I I ty * 4) Water Qua II ty* N N 5) Fish and WI ldllfe 6) Archeological and Historical Structures 7) Aesthetics* 8) Noise* 3. REGIONAL ECONOMIC DEVELOPMENT a. Beneficial Impact 1) Tax Revenues* 2) Property Values* 3) Land Use • TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS PLAN A EVACUATION Removes 40 houses from area. Nl Minor during construction. Nl Nl Nl Minor durinq construction. Minor during construction. Nl Nl Changes existing use to use more compatible with flood hazard • PLAN B CONCRETE CULVERT Nl Minor removal of vegetatIon. Minor durlnq construction. Minor durlnq construction. Nl Nl Minor during construction. Minor durlnq construction. Minor Increases due to reduced floodlnq. Minor Increases due to reduced flooding. Reduces flooding of developed areas. e PLAN C OPEN CHANNEL Removes 6 houses from area. Minor removal of vegetation. Minor during construction. Minor durinq construction. Nl Nl Minor durinq construction. Minor during construction. Minor Increases due to reduced flood losses. Minor Increases due to reduced floodlnq. Reduces flooding of deve I oped areas. PLAN D DIVERSION CHANNEL Removes at least 3 houses from area. M I nor remova I of vegetation. Minor durinq construction. Minor during construction. Nl Nl Minor during construction. Minor durlnq construction. Minor Increases due to reduced flood losses. Minor Increases due to reduced flooding. Reduces flooding of deve I oped areas. e e ITEM 4) Public Facilities* 5) Public Services* 6) Regional Growth 7) Employment* N 8) Business and Industrial VI Activity* 9) Real Income Distribution 10) Displacement of Farms* 11) National Defense b. Adverse Impacts 1) Tax Revenues* 2) Property Values* 3) Land Use 4) Pub II c Fac II I ties* 5) Public Services* PLAN A EVACUATION Nl e TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS PLAN B CONCRETE CULVERT Reduced damage and disruption from flooding. PLAN C OPEN (}lANNEL Reduced damage and disruption from flooding. Reduced disruption from flooding. Reduced disruption from flooding. Reduced disruption from flooding. Nl Nl Nl Nl Minor Increase during Minor Increase during construction. construction. Nl Nl Nl Nl Nl Nl Nl Nl Nl Nl Nl Nl Removal of 40 houses Nl Nl from local tax base. Decreases value of Nl Nl property affected. Nl Nl Nl Nl Minor disruption during Minor. disruption during construction. (:ons tructlon. Nl Nl Nl e PLAN D DIVERSION CHANNEL Reduced damage and disruption from flooding. Reduced disruption from flood lng. Nl Minor Increase during construct ton. Nl Nl Nl Nl Nl Nl Nl Minor disruption during construction. Nl TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS ITEM 6) Regional Growth 7) Employment* 8) Business and Industrial Activity* 9) Real Income Distribution 10) Displacement of Farms* 11) National Defense ~ 4. OTHER SOCIAL EFFECTS a. Benet lela! Impacts PLAN A EVACUATION Nl Nl Nl Nl Nl Nl 1) Displacement of Reduces requirement for Peop I e* evacuatIon dur I ng f I ood s 2) Housing Reduces physical damage from flooding. 3) Leisure Opportunities Minor Increase with more open areas. 4) Community Cohesion* Nl 5) Community Growth* Nl e PLAN B CONCRETE CULVERT Nl Nl Nl Nl Nl Nl Reduces requirement for evacuation during floods Reduces physical damage from floodIng. Nl MInor enhancement due to reduced disruption from f I ood I ng. Minor enhancem~nt due to reduced flood potential. e PLAN C OPEN a-tANNEL .- Nl Nl Nl Nl Nl Nl Reduces requirement for evacuatIon durIng f I oods Reduces physical damage from flooding. Nl Minor enhancement due to reduced disruption from flooding. Minor enhancem~nt due to reduced flood potential. PLAN D DIVERSION CHANNEL Nl Nl Nl . Nl Nl Nl Reduces requIrement for evacuation during floods. Reduces physical damages from flooding. Nl Minor enhancement due to reduced disruption from flooding. Minor enhancement due to reduced flood potentIal. e N 1.11 e ITEM 6) Health and Safety e TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS PLAN A EVACUATION Minor Increase due to reduced f I ood I ng. ·PLAN B CONCRETE CULVERT Minor Increase due to reduced flooding. b. Adverse Impacts D. I) Displacement of People* Relocates 40 families from area. 2) Housing 3) Leisure Opportunities 4) Community Cohesion* 5) Community Growth* 6) Health and Safety RESPONSE TO PLANNING CRITERIA I l Accept ab I II ty 2) Completeness 3) Effectiveness Decreases available housing In area. Nl Disrupts existing neighborhood. Nl Nl Generally acceptable, but not strongly supported. Complete within Itself requiring only periodic maintenance of evacuated areas. Effective for reducing damage to those houses removed. Nl Nl Nl Nl Nl Nl General ly acceptab I e. Complete within Itself requiring only periodic maintenance. Effective for reduclnq damage. 4 ) E ff I c I ency Potential benefits exceed costs. Potential benefits exceed costs. PLAN C <PEN Q-IANNEL Minor Increase due to reduced f I ood I ng. Relocate 6 families. Removes 6 houses. Nl Nl Nl Nl Generally acceptable. e PLI\N D DIVERSION Q-IANNEL Minor Increase due to reduced flooding. Relocate at least 3 famlll es. Removes at least 3 houses. Nl Nl Nl Nl General ly acceptable .and supported. Complete within Itself Complete within Itself requiring only periodic requiring only periodic maIntenance. maIntenance. Effective tor reducing damages. PotentIal benet Its exceed costs. Most effective plan for reducl ng damages. Potential benefits exceed costs. Most efflcl ent plan. ITEM E. SENSITIVITY N "' 1. RISI( 2. UNCERTAINTY PLAN A EVACUATION Large floods can occur, however property subject to flooding Is reduced. Flood stages may be higher or lower for a particular event depending on hydrologic condi- tions at time. Note: Nl- No or Negligible Impact TABLE 5 SUMMARY COMPARISON OF DETAILED PLANS PLAN B CONCRETE CULVERT large f I oods can occur exceed I ng design capacity. Plan shoud stll I reduce flooding without failure. Flood stages may be higher or lower for a particular event depending on hydrologic condi- tions at time. However, overal I stages should be considerably lower. PLAN C OPEN Q-IANNEL Large f I oods can occur excl'led I ng design capacity. Plan should still reduce f I ood I ng wIthout fa II ure. Flood stages may be higher or lower for a particular event depending on hydrologic condi- tions at time. However, overal I stages should be considerably lower. * -Denotes Items speclfical ly mentioned In Section 122 of Pl 91-61 I. e e PLAN D DIVERSION Q-IANNEL large f I oods can occur exceedIng des lgn capacIty. Plan 'should still reduce f loodl ng wl thout fall ure. Flows are diverted. Most f I ood I ng shou I d be eliminated. e Plan A - Evacuation As noted earlier, this plan provides for the removal of 40 houses from the Mon Bijou/Glynn areas. This would remove all damageable property within the estimated_S-year flood plain and return the area to a semi-natural state with only low intensity use. This plan would meet the objectives of reducing flood damages by removing damageable property from the flood plain, enhancing the environment by restoring part of the flood plain to green areas, enhancing recreational opportunities by providing additional open areas for public use, and increasing overall safety by removing the more frequently flooded homes from the area. There are no known archeological or historical sites in the immediate area affected. Therefore, there would not be any contribution toward this objective. Significant impacts of this plan include the effects on the NED account. Benefits to NED would be generated by the reduction in national costs of the losses attributed to flooding in the area. The current losses for the 40 houses to be removed are estimated at $3~9,620 annually. The removal costs necessary to achieve this benefit would be $3.3 million dollars initially, or $310,850 on an annual basis. Thus, the net effect on NED would be positive as indicated by the net benefit of $29,350 and a benefit to cost ratio of 1.09. Beneficial environmental impacts of this plan, as noted in Table 5, would be primarily related to the restoration of the flood plain area through the removal of the existing development and creation of green areas. Since the areas created would not be very large and would be located between two residential areas, the overall beneficial impact would be minor. There would be minor improvement in air quality, water quality, fish and wildlife, and esthetics of the area due to the decreased human habitation. Adverse environmental impacts would mainly be both temporary and minor and associated primarily with the construction activities generated by this plan. These temporary adverse impacts would be characterized by a decrease in air quality and esthetic quality as well as an increase in noise level during the removal of the houses. One significant non-temporary adverse impact that would result from the implementation of this plan is the adverse impact on manmade resources due to the removal of the 40 houses. Beneficial impacts on Regional Economic Development (RED) would be associated with the reduction in flood damages due to changing current land use patterns and with the minor increase in construction-related employment during implementation of this plan. Adverse impacts on RED would be related to the removal of 40 houses from the area tax roles and the decrease in eco- nomic value of the land affected. Beneficial social effects would be related to the increase in area available for recreation and an increase in the safety and well-being of the area residents resulting from the removal of the more frequently flooded houses from the area. Adverse impacts would be related to the permanent displacement of 40 families from the area and the removal of 40 houses from the community, thus disrupting the current neighborhood. -27- The implernentability of this plan is indicated by its response to certain criteria, i.e., acceptability, completeness, effectiveness, and efficiency. This plan is not the most desirable plan from the local viewpoint due to the large acquisition of houses involved and the change of developed, privately owned land to non-developed, publically owned land. The plan is complete within itself providing the benefits as stated for the level of evacuation specified. It does not offer any improvement for the remaining houses in the 100-year flood plain. It is however, dependent on sponsorship by the local government. This plan is effective in reducing the flood damages as stated. It does not a 1 ter the level of flooding. only the flood damage experienced. Since those houses evacuated are permanently removed from the hazard area, this plan is the most effective in assuring future damages are eliminated for these structures. This plan is not the most economically efficient plan in that it does not provide the maximum net benefits. It does, however, provide the maximum net benefits of all the evacuation plans considered. The sensitivity of this plan can be measured in terms of risk and uncertainty. Risk can be represented by the probabi 1 i ty that the plan will function as proposed and produce the results predicted. Uncertainty is an indication of the unknown iterns that cannot be predicted but may occur and cause unanticipated results. InMon Bijou the risks associated with Plan A are those related to the houses remaining in the flood plain. These houses would still be susceptible to periodic flooding. However, this risk is neither increased or decreased by implementation of Plan A. The uncertainty of Plan A relates both to the unknown parameters generating the floods and the specific impacts on individuals who are relocated. Regarding the unknown factors related to flooding, the expected flood levels are based on anticipated average conditions. However, for any specific event those conditions may vary considerably generating either higher or lower flood levels. Since the stream is normally dry and not gaged, there is no correlation data other than randomly observed high water marks. However, given the overland flow nature of the flooding in Mon Bijou covering a rather wide area, significant variations in flood levels are not anticipated. Therefore, the expected levels as presented, should be representative of the flooding probable in the area. The specific impacts on individuals who would be relocated are difficult to assess without a very detailed study and personal interview. Also, such impacts tend to be very time-dependent with the severity of the impact varying with the personal situation at time of implementation. Therefore, there is a large unknown factor involved that produces considerable uncertainty in this area. However, if this plan is selected for implementation, special consideration and arrangements could be made to lessen all such impacts. Plan B - Culvert Enlargement This plan would involve building a new, larger culvert through the upper Mon Bijou area as described earlier. This plan would meet the objective of reducing flood damages by lowering expected flood levels in the area. It -28- would increase safety in the area by reducing the flooding of inhabited areas. However, this plan would not enhance the environment or recreation opportunities of the area. Any protection of historical or cultural resources would be incidental, related only to the reduction in flood levels in the area. Signiticant impacts of this plan on the NED account include the beneficial effects which would result from the reduction in average annual flood damages. These would amount to $382,720 annually. Adverse effects would result from the cost of implementation of this plan. The first cost of this plan would be $3.7 million which would yield an annual cost of $335,640. The net effect on NED would be positive and amount to $47,080 annually with a benefit to cost ratio of 1.14. Environmental impacts would be mainly adverse though minor. Some beneficial effects could be expected related to the protection of the manmade resources of the area. However, most of the remaining impacts would be adverse resulting from the construction activity. This would generate temporary adverse impacts on noise, air quality, and esthetics during the construction phase. Long-term, minor adverse impacts on esthetics and wildlife could be expected from the creation of the debris basin and diver- sion channel for Little Fountain Gut. Regional economic development (RED) impacts would be beneficial, though minor. These would mainly stem from the improved economic conditions of the area related to the reduction in flood losses. There would be a minor increase in tax revenue due to reduced deductions for casualty loss as well as a probable increase in property values. There would also be beneficial impacts related to a reduction in expenditures for repair of public facilities damaged by flooding, as well as a reduction in costs for similar public services. During the construction phase there would also be a minor, though temporary, increase in employment opportunities. Adverse impacts would be generated by the local costs of implementation of this plan and the temporary disruption of public facilities and services during the construction phase. Other social effects (OSE) would be mainly beneficial. These would relate to the reduction in flooding which would reduce the requirement for emergency evacuation and the associated community disruption as well as improve the overall health, safety, and general well-being of the community as a whole. As with Plan A, the implemertability of this plan can be assessed by ascertaining its response to certain criteria; namely, acceptability, completeness, effectiveness, and efficiency. Plan B is generally acceptable to the local interests as a means of reducing flooding and associated damage in the area. It is complete within itself for achieving the results stated requiring only periodic maintenance of the channel work and debris basin. It is an effective means of reducing flooding and associated damage by achieving an 86% reduction in damage. It is an efficient means of reducing damages in that benefits exceed costs. -29- In examining the sensitivity of this plan, it should be noted that because of the hydraulic change, flood levels are lowered. This results in a decrease in the risk for flooding of the houses in the area. However, there is still the risk that large floods will occur, perhaps larger than the design capacity of Plan B •• Also, for any given event, flood levels may be slightly higher or lower than predicted levels. However, the overall design should maintain its integrity and contribute to a significant reduction in overall flood levels even though some residual flooding could still be expected. Therefore, there is some remaining risk associated with exceeding the design capacity of Plan B. At that point, excess flow would again be uncontrolled overland flow and flood the Mon Bijou area. A similar rationale can be applied to the uncertainty associated with Plan B related to variations in hydrologic conditions at time of event occurren~. Under Plan B, flood profiles would still be lower than existing conditions. Other items of uncertainty relate to the condition of the ~edification at time of occurrence. A lack of maintenance of the diversion channel or debris basin could result in higher flood levels than design. However, under almost any condition, flood levels would still be lower than existing. Plan C - Open Channel This plan would require excavating a new channel through the Mon Bijou area, in effect restoring the natural drainageway. By restoring the drainageway, this plan would lower flood levels in the area thereby meeting the objectives of reducing flood damages and improving the safety and well- being of area residents. There would also be some minor enhancement of the area's environment resulting from restoration of the channel area. No provisions would be included for enhancing recreational opportunities primarily due to a lack of local interest. As with Plan B, any protection of historical or cultural resources would be incidental resulting from reduced flooding in the area. Significant impacts of this plan are similar to Plan B. Beneficial NED effects could be expected from reduced flooding in the area. These would amount to an estimated $378,320 annually. Adverse impacts would result from the cost of implementation which would amount to a $3.62 million first cost or an annual cost of $330,300. This yields net annual benefits of $48,020 and a benefit to cost ratio of 1.15. Environmental impacts of this plan would mainly be related to the construction activity and the restoration of the open channel area. Beneficial impacts could be expected due to the restoration of the channel area which would create a greenway through the housing area. There would also be a minor reduction in overall noise level and minor improvement in esthetic quality due to the replacement of a part of the developed area with ·an uninhabited greenway. Adverse impacts could be expected during the construction period which would be temporary and minor. There would be some degradation of air quality and esthetic quality during the construction activity as well as an increase in overall noise level. These would be similar to Plan B. -30- L Regional Economic Development impacts under this plan would be similar to Plan B. There would be beneficial impacts related to the reduced flooding and improved economic conditions in the study area. Adverse impacts would be related to the costs of implementation on local financial resources and the impacts related to the relocation of six houses. However. overall impacts should be beneficial. Other social effects would be a mixture of Plans A and B. Beneficial impacts would result from the reduced flooding which would reduce the need for emergency evacuation and enhance safety. area housing. and community cohesion. Adverse impacts would result from the displacement of those living in the houses to be removed from the area. This would cause some disruption of the community and create hardships on those directly affected. The implementability of this plan is also similar to Plan B. Plan C is generally acceptable to local interests even though. as with Plan A. there is concern over removable of the six houses. Plan C is complete within itself in that it will reduce flooding and flood damages in the Mon Bijou area once implemented. Other than minor maintenance. it does not require additional action to achieve estimated results. Plan C is an effective method for reducing flood damages achieving an 85% reduction in average annual flood damage. The sensitivity of Plan C also reflects a combination of that noted for Plans A and B. As noted for Plan B. the risk associated with Plan Cis considerably less than the risk under existing conditions. Flood levels which cause damage are still possible under Plan C. However. the probability of their occurrence for any given level of flooding is significantly reduced. The uncertainty of Plan C is also reflected in the unknown conditions related to flooding and flood levels as well as specific impacts on those persons relocated. The uncertainty related to flood levels would be less than Plan 8 due to the decreased dependent on maintenance of the debris basin and high velocity channel. Also. the uncertainty related to humanistic impacts would be considerably less than Plan A due to the significant decrease in number of houses affected. Plan D - Diversion Channel This plan would require excavating a new channel around the Mon Bijou and Glynn areas to divert flood water away from the existing development. All flows from Canaan Gut and Little Fountain Gut that enter the upper portion of Mon Bijou would be diverted by levee and channel works north of the area. This plan would therefore greatly reduce the flooding potential of the area thus meeting the objectives of reducing flood damages and improving the safety and well-being of area residents. Due to the construc- tion effort and creation of the new channel. this plan would not provide any -31- enhancement of the natural environment. However, the human environment would be significantly improved by the reduction in flooding. Again, no provisions would be included for enhancing local recreational opportunities. Also, any protection or enhancement of historical or cultural resources would be incidental resulting from reduced flooding in the area. Significant economic impacts of this plan are similar to Plan C. Beneficial NED effects could be expected from reduced flooding in the area. These would amount to $415,800 annually. Adverse impacts would result from the cost of implementation which would amount to almost $3.6 million first cost or an annual cost of $338,000. This would yield a net beneficial effect of $77,800 and a benefit to cost ratio of 1.23. Environmental impacts of this plan would be mainly related to the construction activity along the bypass route. Existing vegetation would be destroyed and replaced with an altered landscape and periodically maintained channel and right-of-way. There would also be minor adverse effects asso- ciated with the construction activity. These would relate to the temporary degradation of air quali~, increased noise level, and impaired esthetics of the area. This should cease following completion of construction. Regional Economic Development impacts under this plan would be similar to Plan C though somewhat more beneficial. The reduced flooding and improved economic conditions of the area would have a beneficial impact on the local economy and financial resources. The costs of project implemen- tation would adversely affect local area financial resources. However, as with NED, the net effect should be beneficial. Other social effects would be related to the reduction in flooding which would improve the safety and general well-being of the area resi- dents. The reduction in flooding would also tend to allow an improvement in the community by allowing normal appreciation and property improvements. This plan would beneficially impact more people than any of the other plans considered and avoid most of the adverse effects of the relocation plans. The implementability of Plan D is similar to Plan C. Plan D is accept- able to local interests and strongly supported as the most appropriate method for reducing flood damages. It is complete within itself producing the estimated flood damage reduction without requiring additional action. Only periodic maintenance would be required to insure proper functioning of the work. Plan D is the most effective and efficient means for reducing flood damages by achieving a 94% reduction in damages and the greatest net benefits. The sensitivity of Plan D reflects the factors noted before. The risk associated with Plan D are considerably less than that noted for any other plans. Since all flood waters would be diverted around most of the develop- ment, much of the flood risk is virtually eliminated. Only an extremely rare event (exceeding SPF) may produce some residual flood damage. The uncertainty associated with Plan D is considerably less than that of the other plans since flood waters would be diverted rather than just lowered. -32- TRADE-OFF ANALYSIS In the above evaluation, the impacts of the various plans were sum- marized. In order to arrive at the optimum plan for the Mon B~jou area, an analysis of the relative differences in the above plans is necessary. Then, either the best plan from those considered could be selected for implemen- tation, or the most beneficial features of the various plans could be com- bined to form a new alternative which maximizes the beneficial effects while minimizing the adverse effects. In reviewing the four detailed plans considered above, Plan A was shown to provide significant beneficial effects in reducing flood damages in the area through the removal of the flood prone property. Also, there are bene- ficial, though not significant, impacts on the local area environment through the removal of the houses and creation of green belts. However, there are also adverse impacts on the human resources and community due to the removal of the homes from the area and the relocation of these resi- dents. Plan B provided a similar beneficial impact on the reduction in flood damages. However, it does not provide any improvement of the existing natural environment nor does it generate the adverse social effects noted above from relocating people. Plan C, likewise, provides a similar benefi- cial economic effect by reducing flood damages. However, it also provides some enhancement of the environment by the reestablishment of the open chan- nel and green way through the area. This is done at the expense of the local community cohesion by removing some houses from the area, although the impact is far less significant than Plan A. Additionally, Plan C, like Plan B does nothing for flooding in the lower Mon Bijou and Glynn areas. Plan D has a similar beneficial, though significantly greater impact on the economy, due to the protection of a larger area and thus, a greater reduction in flood damages. It does not provide any enhancement to the environment. Its social impacts are mainly beneficial resulting from the reduction in flooding. There would still be some minor adverse impacts associated with the relocation of at least 3 houses. However, this is considerably less than either Plan A or C. In analyzing these plans and their relative impacts some trade-offs bet- ween Plans A, B, and C may be possible to achieve either a more environmen- tally oriented or socially oriented goal. However, trade-offs between Plan D and the others do not appear warranted since the features of Plan D fall generally outside the directly affected area of the other plans and since implementation of Plan D would completely obviate the need for any other flood reduction work. Therefore, no trade-offs are considered warranted for Plan D. Likewise, since Plans A, B, and C represent different methods of reducing flood damages with other impacts solely dependent on the method used to reduce damages, trade-offs between those plans are not considered warranted. -33- IDENTIFICATION OF THE NED PLAN Consistent with Federal guidelines for water resource development, the plan yielding the greatest economic benefits in excess of economic costs, consistent with protection of the environment, is designated as the NED plan. Based on the above comparative analysis, Plan D is shown to yield the greatest net benefit for the area. This plan also achieves these results in a manner consistent with protecting the resources of the area. Therefore, Plan D is designated as the NED plan. PLAN SELECTION In reviewing the above assessment and evaluation of the four plans, as summarized on Table 5, it becomes apparent that Plan D provides a signifi- cant reduction in flooding of the area while minimizing the disruption of the community. As such, it generates overall beneficial effects related to the reduction in flooding and associated damages. While Plan A achieves a similar reduction in flood damage and thus a similar beneficial effect, it also requires the removal of 40 houses which significantly increases the adverse impacts associated with relocation on the community and its resi- dents. Plan B also achieves a similar significant reduction in flooding and flood damages. However, it does not require any relocations. Therefore, its adverse effect on the community and its residents are minimized. However, with Plan B, as noted earlier, there is a higher risk and uncer- tainty level than with Plan C and D due to the nature of the design, depen- dence on maintenance, and capacity limitation of the improvement. Plan C, likewise, achieves a significant reduction in flood damages. However, this plan, like Plan B, does nothing for flooding in the lower Mon Bijou and Glynn area. From an economic standpoint, all four plans are feasible solutions to the flood problems. Also, given the relative range of net annual benefits ($29,350 to $77,800), all four plans achieve similar economic efficiency. However, since Plan D does yield the highest net benefits, it has been designated as the NED plan. In light of the above evaluation and assessment and in accordance with current planning guidance Plan D, the NED plan, is designated as the selected plan. It achieves the highest net economic benefits while mini- mizing adverse impacts. Also, it represents a significant improvement in the area as compared to the without project condition that would be experienced under the "no action" plan. THE SELECTED PLAN PLAN DESCRIPTION As noted earlier, Plan D, diversion channel, involves the construction of a bypass channel around the Mon Bijou and Glynn area. The proposed plan would be located as shown on Plate 2. The main channel would have a grass- lined trapezoidal section with a bottom width of 75 feet and side slopes of -34- one vertical to three horizontal. The channel work would extend some 6,500 feet beginning downstream of the Glynn area and extending around the north side of the developed area to just above Mon Bijou. Thirty-four gabfon drop structures would be provided to reduce velocities and control the stream gradient through the area. Two new bridges would be required along the new channel to maintain existing traffic routes. A levee would be pro- - vided on the upstream end to divert water into the new channel. Right-of-way requirements for this plan include the removal of at least three houses from the area. These are located in the lower Glynn area. The occupants would be given assistance in finding replacement housing elsewhere under the provisions of Public Law 91-646. The houses would be demolished after acquisition. Additional easements would be required where the construction right-of-way crossed parts of other properties. DESIGN AND CONSTRUCTION The design capacity of the bypass channel is based on the 10 year discharge at the lower end of the Mon Bijou area, some 3,370 cubic feet oer second. This discharge is carried throughout the 6,500 feet length for velocity and flow profile determination. At the upper end of the diversion, the design flow is in excess gf a 100 year event due to the smaller basin. Local inflows increase the discharge for a particular event as the flow tra- vels downstream. However, since the diversion crosses into another drainage area that does not rejoin the Canaan Gut/Salt River channel until at a point below the developed area, this effect will not alter the basic performance of the channel in diverting the flow. Based on the flow, soil conditions, and type of channel, a design maximum discharge velocity was set to establish channel dimensions. For the design, a discharge velocity of about 6 feet per second was used. This would provide a channel with a 75-foot bottom width, 3 to 1 side slopes, and a 6 foot flow depth. Since the flow in the channel is intermittent, depending directly on rainfall, vegetative cover in the channel should be well established. Also, the short duration of flows should minimize the time of potentially scouring flows. Therefore, under these conditions scour should be minimal. In order to control velocities in the stream channel, drop structures will be required. The bypass channel drops about 120 feet over its 6,500- foot length. Since flow will be intermittent and of short duration, gabion- lined drop structures were selected to provide flow control and grade change. In all, some 34 structures would be provided, each producing a 3-4 foot drop. Overland flow from Little Fountain Gut will enter the main chan- nel between drop structures 28 and 29 (Sta. 56+00 and 57+00). The channel reach between the drop structures would be lined with a gabion mattress for a length of about 200 feet. Details of a typical drop structure are shown on plate 3. -35- At the upper end where the bypass channel joins canaan Gut a:levee would be constructed to help divert flow from the existing channel into the new channel. This levee would extend along the new channel for about 400 feet to insure diversion of tanaaft Gut runoff. This levee would be constructed to contain the Standard Project Flood with adequate freeboard. A ~pical section is shown on plate 3. As noted earlier this plan also includes the construction of 2 new bridges. The first would be at Canaan Road near the upstream end of the diversion. The.other would be on a local street near the lower end of the Glynn area as shown on plate 2. If authorized and following completion of any necessary revisions to the basic design, detailed plans and specifications would be prepared for bid solicitation and construction. Construction would be accomplished under contract with supervision by the Corps of Engineers. It is estimated that the project could be completed in 12 months. A detailed cost estimate for the proposed plan is provided in table 6. All work is based on July 1987 price levels, utilizing the FY-88 discount rate of 8-5/81 to determine an annualized cost. OPERATION AND MAINTENANCE Operation and maintenance of the proposed project would require only periodic grass cutting of the channel area and occasional repair of any eroded or damaged areas. There is no requirement for onsite operation nor is any permanent machinery involved, other than during construction. In addition to mowing, the project would be inspected on an annual basis and also following significant events to evaluate performance and condition. ACCOMPLISHMENTS As noted earlier, this plan would reduce flooding and associated damage in the Mon Bijou area. It would enhance the overall health, safety, and general well-being of the area residents. It achieves the national goals of maximizing contributions to NED consistent with protection of the environment. The overall impacts of this plan on area attributes and resources are noted on table 5. In summary, there would be a net positive effect on the NED account due to the excess of benefits over costs resulting in a benefit- cost ratio of 1.2. There would also be a minor adverse effect on the EQ account due to the construction of the bypass channel. The net effect on the RED account would also be positive due to the reduced flooding and improved economic condition of the area. And, there would be a net positive effect on the OSE account due to the increased safety and well-being of Mon Bijou residents. -36- TABLE 6 PROPOSED PLAN COST ESTIMATE Unit Total Item Unit Quantity Cost Cost Channel Work Mobilization/Demob Job 1 L.S. $ 20,000 Excavation C.Y. 285,000 2.50 712,500 Levee Construction C.Y. 1,500 1.25 1,875 Clearing and Grubbing Acre 25 1500 37,500 Grassing Acre 10 1500 15,000 Gabion Control Structure C.Y. 8,500 90 765,000 Inlet Modifications Job 1 L.S. 63,500 Building Removal Job 3 2000 6,000 Subtotal $1,621,375 Contingencies (20%)+ 324,275 Contract Price - $1,945,650 Engineering and Design/S&A (18%) + 350,150 Subtotal $2,295,800 Relocations and Alterations Bridges 2 L.S. $ 605,000 Utilities L.S. 25,000 Subtotal $ 630,000 Contingencies (20% +) 125,000 Subtotal $ 755,000 Lands and Dama~es Right-of-way and Easements $ 307,500 Residential acquisitions 150,000 PL 91-646 31,500 Administrative Costs (10% +) 47,500 Subtotal $ 536,500 Contingencies (15% +) 80,000 Subtotal $ 617,000 TOTAL INITIAL COST $3,667,800 INTEREST DURING CONSTRUCTION 150,000 TOTAL INVESTMENT COST $3,817,800 Annua 1 Costs Interest & Amortization $ 334,600 (8 5/8% for 50 years) e Maintenance 3,400 $ 338,000 TOTAL -37- CULTURAL RESOURCES A cultural resources survey was conducted of the proposed project area, defined as a corridor approximately 61 meters wide and 2,016 meters long (Cultural Resources Survey: Mon Bijou, St. Croix, V.I., 1984) (See Plate 10). This work was accomplished in accordance with the National Historic Preservation Act of 1966, as amended (PL 89-665); the Archeological and Historic Preservation Act, as amended (PL 93-291); and Executive Order 11593; and was coordinated with the State Historic Preservation Officer (SHPO). The results of the survey indicate that although the project does include a section of the Upper Salt River Archeological District of the National Register of Historic Places, it will not adversely affect any known prehistoric sites. However, two sites - Glynn and the Lebanon Dam Site - are located adjacent to the channel and must be carefully avoided during all phases of construction. In addition, a depression area that may be a signi- ficant resource was located during the survey, west of the Estate Lebanon stock pond. Given the proximity of known National Register sites to the project area and the identification of a possible cultural resource within the corridor, the SHPO concurs with the survey report's recommendation for archeological monitoring during construction (letter dated January 25, 1984). A monitor will be present during construction to ensure that signi- ficant sites are not adversely impacted. The construction contractor will clean the depression area (previously identified as a potential site) of stones to allow the monitor access to examine this area and determine if it is a significant site. Some concern also exists regarding indirect impacts from water discharged by the proposed channel. Since the water level and velocity will not be increased by the proposed project, no adverse effects to downstream sites due to channel construction and operation are anticipated. MITIGATION REQUIREMENTS As discussed above and noted earlier, the selected plan does not adversely impact any significant environmental resource in the area. Thus, no mitigation plan is required. However, there are known archeological sites in the area and care must be taken to avoid adversely impacting these sites. At present, there are no known sites that would be adversely affected. However, if during construction, sites are uncovered by the above mentioned monitor appropriate action will be taken as specified in 36 CFR 800 "Protection of Historic Properties". OTHER CONSIDERATIONS As noted earlier, Executive Order 11988 requires Federal agencies to recognize significant values of flood plains and to consider public benefits that would be realized from restoration or preservation of flood plains. The four criteria cited earlier provide the basis for determining overall plan compliance with the order. In this regard, it is noted that the flood -38- plain iri the project area has been greatly. altered by the housing development. While the proposed plan ts withtn the flood plain. tt ts considered to be tht only practical alternative for implementation. It also actually reduces ~he extent of tht flood plain. In this re,ard. fts overall effect is to reduct the hazards and rtsks associated with f oods and thus _ minimize the impacts of floods on safety. health. and the general well-being of the area. • • In ~few of these effects and findings. the proposed plan 1s considered to be in full compliance with Executive Order 11988. Additionally. since there are no wetlands in the proposed area. the provisions of Executive Order 11990 regarding protection of wetland areas, are not considered applicable to the proposed plan. PLAN IMPLEMENTATION INSTITUTIONAL REQUIREM~NTS This final report is to be forwarded for further review within the Corps of Engineers. When and if approved, the project would be placed on the national list of projects. awaiting funding. When funds become available, plans and specifications would be prepared, local interests would be asked to sign formal agreements, and a contract then advertised and awarded to perform the work. Once rights-of-way and easements are provided, construction would be commenced under supervision of the Corps. Following completion of construction, all project works would be transferred to the local interests for operation and maintenance. · DIVISION OF RESPONSIBILITIES AND COST SHARING The implementation of the proposed plan is a joint endeavor by local and Federal interests. Thus, responsibilities for implementation are shared by each. The Federal Government, through the Corps of Engineers, would be the lead agency in plan implementation. As such, the Corps would be responsible for all design work and engineering, preparation of all necessary contract documents, contract award, supervision of construction, and assuring project completion. However, prior to implementation, local interests must enter into an agreement with the United States in accordance with Section 103(j) of the Water Resources Development Act WROA) of 1986 (PL 99-662). Generally, they must agree to provide all lands, easements, rights-of-way, relocations, highway bridge alterations, and certain other costs associated with the project, as well as operate and maintain the project when complete as specified in a Local Cooperation Agreement. The Act further modified the cost-sharing requirements. Table 7 below shows the cost-sharing requirements for the proposed plan under the present cost- sharing arrangements. It should be noted that all costs for operation and maintenance are a local responsibility. Section 103(m) of the Act reduces the non-Federal cost-share of a flood control project under an •ability to pay" determination. Guidelines for this determination were derived from 33 CFR Part 241 contained 1n the Federal Register of September 23, 1987. -39- ~ev. 4/88 . . The Benefits Based F·loor (BBF) of 30 percent and tffictency Factor (lF) of 1 were utilized as specified in the referenced gutdeltnes. Also. ·Section 1156 of the WRDA of 1986 waives certain cost-sharing requirements up to szoo.ooo for any one project. These cost sharing determinations are reflected tn the table below. The local sponsor has expressed the ftnancfal capabtltty to ••t the non-Federal obltgatfons as shown tn table 7 and ai spectfted tn the .Local Cooperation Agreement (LCA). TABLE 7 PROPOSED PLAN COST SHARING Item - Channel Work Relocations Land and Damages TOTAL 51 Non-Federal Contribution Subtotal Total $2,295,800 755,000 617,000 $3,667,800 251 Minimum Contribution 50S Maximum Contribution Adjustment for Min. or Max. Subtotal Section 103(m) Adjustment Subtotal Section 1156 Adjustment TOTAL FIRST COST Federal $2,295,800 $2,295,800 - 183,400 $2,112,400 0 s2.u2,4oo + 455,000 $2,567,400 + 200,000 $2,767,400 PUBLIC INVOLVEMENT Non-Federal $ 755,000 617,000 $1,372,000 + 183,400 $1,555,400 917,000 1,833,900 0 $1,555,400 - 455,000 $1,100,400 - 200,000 s 900,400 Throughout preparation of this report close coordination has been main- tained with the local sponsor, the Public Works Department of the Government of the u.s. Virgin Islands, and with other governmental offices, elected officials, special interest groups, and individual citizens. On May 29, 1987, the Corps distributed the Draft Detailed Project Report for review and comment. A list of those receiving the draft report is provided below: Federal Agencies Environmental Protection Agency National Marine Fisheries Service Department of Agriculture (SCS) -40- Federal Agencies (Continued) National Park Service Federal Highway Administration u.s. Fish and Wildlife Service U.S. Geological Survey Territorial Agencies Governor of the U.S. Virgin Islands Virgin Islands Port Authority Department of Conservation and Cultural Affairs Virgin Islands Public Relations Office Department of Commerce Department of Public Works Department of Agriculture Director of Tourism Virgin Islands Housing Authority Virgin Islands Urban Renewal Board State Historic Preservation Officer Office of Coastal Zone Management Virgin Islands Planning Office On June 30, 1987, a Public Workshop was held at the John H. Woodson Junior High School adjacent to the Mon Bijou community on St. Croix. The purpose for the workshop which was sponsored by the Public Works Department, was for the Corps to present a summary of the flood problems at Mon Bi jou and to provide a discussion of the study findings and recommendations. Approximately 60-65 people were in attendance at t~ meeting which provided an op.portuni ty for the attendees to ask Corps representatfft'S. as well as Public Works officials, specific questions related to local concerns and issues of the proposed project. These concerns focused on the residents• desire to implement flood reduction measures without delay. The need for safety precautions was expressed as several residents were fearful of children playing within short proximity of the proposed bypass canal. The requirement for continued upkeep and maintenance was similarly stressed. The meeting which received local press and television coverage was well received by local residents who have long endured disastrous flooding which threatened lives and property. The local sponsor has agreed to fulfill the requirements of local cooperation as stated within the Local Cooperation Agreement between the Department of the Army and the Government of the U.S. Virgin Islands. This Letter of Intent and other pertinent correspondence can be found in Appendix G of this report. CONCLUSIONS Based on the analyses presented earlier and the input provided by others, Plan D, construction of a bypass diversion channel around the Mon Bijou area, appears to be in the best overall public interest and the most -41- feasible plan for implementation. This plan meets designated criteria for participation by the Federal Government in improvements for flood control. It also conforms to the guidelines for Federal water resource project development as provided under Principles and Guidelines. There are no more economical plans identified that address the primary study objectives and achieve a significant reduction in flood damages for the area. The impacts of the proposed plan are deemed beneficial overall and the plan is con- sidered to be in full compliance with all pertinent environmental statutes as well as other Federal laws and directives regarding water resource project development. For these reasons and in view of the comments received from other interested parties, Plan 0 was determined to be the best plan for implementation. RECOMMENDATIONS Therefore, I recommend that the selected plan described in this report for flood control at Estate Mon Bijou on the island of St. Croix, U. s. Virgin Islands, be authorized for Federal implementation under Section 205 of the 1948 Flood Control Act, as amended, with such modifications as in the discretion of the Chief of Engineers may be advisable at a presently esti- mated Federal first cost of $2,767,400 subject to cost sharing and financing arrangements satisfactory to the President and the Congress. This recommendation is made with the provision that, prior to implementation, local interests will, in addition to the general requirements of law for this ~pe of project, agree to: a. Provide, during the period of construction, an amount equal to not less than 25 percent of total projects costs for flood control, at least 5 percent of which will be cash. The Virgin Islands shall receive a waiver of $200,000 of its required cost-sharing requirements as specified by Section 1156 of Public Law 99-662. This waiver is applicable to the 5 per- cent contribution and additional cash contributions as may be required. The amount to be provided shall include the value or cost of all lands, ease- ments, right-of-way, and utility and facility alteration and relocations necessary for construction and subsequent maintenance of the project including suitable borrow and dredged material disposal areas, as may be determined by the Chief of Engineers. b. Provide all lands, easements and rights-of-way, including suitable disposal areas as determined by the Chief of Engineers, necessary for construction and maintenance of the project. c. Accomplish all relocations and alterations of structures, utilities, highways, railroads, bridges (other than railroad bridges and approaches), sewers, and related and special facilities determined to be necessary for construction of the project; d. Hold and save the United States free from damages due to the construction or operation and maintenance of the project, except for damages due to the fault or negligence of the United States or its contractors. -42- e. Maintain and operate all the works after completion in accordance with regulations prescribed by the Secretary of the Army. f. Publicize flood plain information in the area concerned and provide this information to zoning and other regulatory agencies for their guidance and leadership in preventing unwise future development in the flood plain and in adopting such regulations as may be necessary to prevent unwise future development and to ensure compatability with protection levels pro- vided by the project; g. To the extent of its powers, prescribe and enforce regulations to prevent obstruction of or encroachment on the project that would reduce the level of protection it affords or that would hinder operation and maintenance; h. Assume full responsibility for all project costs in excess of the Federal cost limitation of $5,000,000; i. Fulfill the requirements as specified by the applicable provi- sions of the Uniform Relocation Assistance and Real Property Acquisition Policies Act of 1970 (Public Law 91-646) approved 2 January 1971; and j. Comply with Section 601 of Title VI of the Civil Rights Act of 1964 (Public Law 88-352) and Department of Defense Directive 5500.11 issued pursuant thereto and published in Part 300 of Title 32, Code of Federal Regulations, in connection with construction, operation, maintenance, and rehabilitation of the project. The recommendations contained herein reflect information available at this time and current Departmental policies governing formulation of individual projects. They do not reflect program and budgeting priorities inherent in the formulation of a national civil works construction program nor the perspective of higher levels within the Executive Branch. Consequently, the recommendations may be modified before they are approved for implementation. C2H~tl Q Robert L. Herndon Colonel, Corps of Engineers District Engineer -43- • REPLY TO ATIENTION OF CESAJ-PD-ES DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS P. 0. BOX 4970 JACKSONVILLE, FLORIDA 32232·0019 ESTATE MON BIJOU, ST. CROIX, U.S. VIRGIN ISLANDS FLOOD CONTROL STUDY FINDING OF NO SIGNIFICANT IMPACT I have reviewed the planning document and the Environmental Assessment of the planned action. These documents reflect pertinent data obtained from cooperating Federal agencies having jurisdiction by law and/or special expertise and from the interested public. The concerns applicable to whether or not this project would significantly affect the human environment are addressed in those documents and are summarized below. a. No wildlife habitats, wildlife concentrations, or environmental properties that sustain and enrich human life would be significantly degraded. b. Archeological surveys and coordination with the SHPO provided a suitable plan for protecting and preserving cultural resources in the project area. c. No threatened or endangered species'existence would be jeopardized, and no critical habitats would be adversely affected. I find, based on the above summary, the planned action will not signifi- cantly affect the quality of the human environment and does not require an Environmental Impact Statement. W£ J.L.Q__ DATE: 17 December 1987 Robert L. Herndon Colonel, Corps of Engineers District Engineer ENVIRONMENTAL ASSESSMENT ESTATE MON BIJOU, ST. CROIX, V.I., FLOOD CONTROL STUDY DECEMBER 1987 1.00 Project Location: A 2.5-square-mile watershed area containing a resi- dential community about 5 miles west of Christiansted in north-central St. Croix, U.S. Virgin Islands. See the attached location maps. 2.00 Purpose and Need for Project: The Mon Bijou area and the watershed to the east, Glynn area, are flow-through areas between Blue Mountain and Mount Eagle to the west and Salt River Bay to the northeast. The flow-through water is normally contained in Canaan Gut (drains Blue Mountain and Mount Eagle) and Little Fountain Gut from elevations exceeding 1,000 feet m.s.l. in the mountains through the Mon Bijou/Glynn areas, with elevations ranging from 80 to 200 feet m.s.l., to sea level in Salt River Bay. Intense rain- storms in the mountains cause sudden high-volume runoff towards the east through Canaan Gut. These flash floods have overflowed into the Mon Bijou area three times in the 5 years preceding 1980. These overflows inundate over 90 private homes and cause extensive damage. Some provision is needed to contain and drain these flash floods that will remove this threat to human life and private property. 3.00 Project Plans Coordination: The following agencies were consulted concerning control measures contemplated, endangered and threatened species, environmental concerns, cultural concerns, and fish and wildlife values: u.s. Fish and Wildlife Service (FWS), u.s. Department of Agriculture, u.s. National Marine Fisheries Service (NMFS), U.S. Environmental Protection Agency (EPA), the U.S. Virgin Islands Planning Office, and the U.S. Virgin Islands Department of ~onservation and Cultural Affairs. 4.00 Flood-Control Alternatives: 4.01 Nonstructural Alternatives. a. NS-1. Without condition (No Action) Alternative: This alter- native would allow the periodic flash floods to continue causing damage to private and commercial property in the project area. This alternative would not meet the study's objective of determining an economical method for con- taining and drawing off the periodic flash flood waters; therefore, it is unacceptable. b. NS-2. Relocation of houses from the flood-prone areas. This alternative is not feasible because a replacement community for the moved houses with streets and utilities located outside the flood plain would be required, and such activities would greatly increase project 'costs. c. NS-3. Establishment of local government flood plain regulations {zoning ordinances, building codes, and restrictions). This alternative would only prevent flood damages to future homes. The existing homes, and people living in those homes, would still be subject to periodic flash flooding. This alternative is, therefore, not feasible. d. NS-4. Flood warning, temporary flood evacuation, and other emergency planning would not be an effective response to flash flooding; therefore, this alternative would not be feasible. e. NS-5. Flood proofing the existing homes: Raising the homes is not feasible because of their type of construction {slab-on-grade). Ring levees or walls cannot be guaranteed to be overflow or damage-and-collapse proof. Ring levees or walls would not protect people and property caught outside during a flash flood. This alternative is, therefore, not feasible. f. NS-6. Relocate residents. This alternative would require the purchase, at fair market value, of both lots and buildings, and it would require compliance with PL 91-646 {Uniform Relocation Assistance and Real Property Acquisition Policies of 1970). The total cost of relocating all of the families currently living in this flood-prone area into flood-safe and adequate dwellings would be acceptable. This alternative does offer a potentially feasible plan for reducing flood damage. 4.02 Structural Alternatives {see plates 2, 8, and 9 in the main report). a. S-1. Construction of a grass-lined bypass channel with gabion-lined drop structures north of the flood-prone areas. This alter- native would provide a bypass for flash-flood waters to the north of the flood-prone areas. It appears to be feasible from pertinent economical, engineering, environmental, and historical and cultural concerns. This alternative is the recommended plan. b. S-2. Construction of a bypass channel north of the flood-prone areas with the addition of a storage area and dam located at the site of an existing, but relatively small, pond. This alternative appears feasible from engineering and environmental viewpoints; however, dam construction would significantly add to project costs, dam construction could damage historical and cultural resources (see paragraph 5.03-Lebanon Dam) located on the south side of the considered dam site, and the storage area is not necessary to accomplish the desired flood control. c. S-3. Construction of a bypass channel north of the flood-prone areas with the addition of a leveed detention area at the downstream end of the channel. This alternative appears feasible from engineering and environmental viewpoints, but it does not appear feasible from historical, cultural, and economic viewpoints. The area being considered for the deten- tion area contains four clusters of aboriginal sites dating back to 100 A.D. The area has been nominated for inclusion in the National Register of Historic Places and appears to be a valuable archaeological resource. This 2 alternative would provide downstream storage and recreation potential; however, this additional storage capacity does not appear to be necessary to solve the flooding problem. d. S-4. Construction of a bypass channel with the addition of an upstream storage area and a downstream detention area (Alternatives S-2 and S-3 combined): This alternative would be feasible from engineering and environmental viewpoints, but the reservations listed in paragraphs b and c above would still apply. e. S-5. Construction of a bypass channel through Mon Bijou along an existing drainage ditch route with one entrance channel from the north, one entrance channel from the west, and a debris basin between the entrance channels and the bypass channel. This alternative would provide a rapid bypass for flash-flood waters through the center of the flood-prone areas, and it is feasible from the economic, environmental, and engineering view- points. This alternative's location is believed to be in an area of high cultural resource sensitivity, therefore, it has the potential of destroying valuable historic and cultural resources. 5.00 Environmental Impacts: 5.01 The project area has the following ecological characteristics. The vegetation is wholly upland grasses and large trees such as Flamboyan (Delonix re~ia), Thorn scrub (Acacia), gumbo-limbo (Bursera simaruba), mango (Mangitera 1ndica), and tamarindo {Tamarindus indica). There are no wet- lands in the area of considered flood-control activities. The Salt River Bay, northeast of the project area, has valuable mangrove and salt pond wetland areas. This wetland area receives the freshwater runoff from the project area but would not be adversely affected by any of the contemplated alternatives. There are no significant habitats, wildlife concen- trations, or other valuable environmental characteristics in the project area. 5.02 No critical habitats or threatened and endangered species occur in the project area. The U.S. Fish and Wildlife letter of June 17, 1987 (copy in the correspondence section of the Detailed Project Report) completes the requirements of Section Seven of the Threatened and Endangered Species Act. 5.03 The Virgin Islands State Historical Preservation Officer (SHPO) notified the Corps by letter dated 10 December 1982 (copy included in the correspondence section of the Detailed Project Report) of the requirement for a systematic archaeological survey for any selected construction plan. A cultural resources survey (copy on file in the Jacksonville District Office) of the S-1 plan corridor concluded that only insignificant effects on two of the area's prehistoric archaeological sites (labeled Glynn 1 and Lebanon Dam on the cultural resources location map) could be expected as a result of the recommended plan. The recommended plan includes a pre- construction survey of a potential archaeological site (depression west of 3 the existing pond). Effects on any significant cultural or archaeological resources uncovered during construction would be avoided, or unavoidable damage to such resources would be mitigated. Plans S-2, S-3, and S-4 could cause significant damage at the Glynn 1 site and/or at the Lebanon Dam site. A cultural resources survey has not been performed for Plan S-5, and the SHPO has identified the Plan S-5 route as an area of high cultural resource sensitivity. A survey would be performed for S-5 if it is selected. The selected plan (S-1) is in full compliance with the National Historic Preservation Act of 1966, as amended, for the current stage of planning. The State Historical Preservation Office has offered to assist in project monitoring for the protection of significant deposits located near the pro- posed channel's corridor and to evaluate possible secondary effects on cultural resources located downstream of the proposed construction area. 5.04 Puerto Rico Coastal Management Program. This study is consistent with the approved Virgin Islands CZMP, because the planned work and flood control effects would not occur in the Virgin Islands Coastal Zone. 5.05 Flood Plain Management. (a) The selected plan would occur in a flood plain. (b) There are no practicable alternatives to the selected plan, and the selected plan cannot occur outside the flood plain. (c) A Public Notice to notify all interested agencies and the general public in the study area of the necessity for implementing the Selected Plan in the subject flood plain and to request views and comments will be sent out before commitment of resources for this work. (d) The planned action would prevent the flooding of the residential and commercial areas in and around Estate Mon Bijou, and no significant adverse impacts have been identified. No natural and beneficial flood plain values would be lost. (e) No development as a result of flood control in the study area is anticipated. (f) No adverse impacts will occur; therefore, no method to minimize adverse impacts will be required. (g) The Selected Plan is the most responsive to the study's objective of providing economical flood control without causing significant environ- mental damage, and it is consistent with the objectives of Executive Order 11988 on Flood Plain Management. 5.06 Protection of fish and wildlife resources. The Contractor shall keep construction activities under surveillance, management, and control to mini- mize interference with, disturbance to, and damage to fish and wildlife resources. Species that require specific attention along with measures for 4 their protection will be listed by the Contractor prior to the beginning of construction operations. 5.07 The relationships of plans to environmental protection statutes and other environmental requirements are shown in Table 1. The U.S. Soil Conservation Service states that this proposal will not adversely affect prime or unique agricultural lands; therefore, this proposal does not require evaluation for compliance with the Analysis of Impacts on Prime and Unique Farmland. 6.00 The agencies consulted during the preparation of this document are listed below: Director Office of Federal Activities EPA, Region II 26 Federal Plaza New York, New York 10278-0012 Area Supervisor National Marine Fisheries Service Environmental Assessment Branch 3500 Delwood Beach Road Panama City, Florida 32407-7403 Director, caribbean Area Soil Conservation Service, USDA GPO Box 4868 San Juan, Puerto Rico 00936 Superintendent Virgin Islands National Park National Park Service Post Office Box 806 St. Thomas, Virgin Islands 00801-0806 Territorial Representative Federal Highway Administration U.S. Federal Building, Room 114 Veterans Drive St. Thomas, Virgin Islands 00801 Chief Environmental Impacts Branch U.S. Environmental Protection Agency 26 Federal Plaza, Room 400 New York, New York 10278-0001 5 Honorable Alexander A. Farrelly Governor of the Virgin Islands of the United States Office of the Governor Charlotte Amalie, St. Thomas, Virgin Islands 00801 Executive Director Virgin Islands Port Authority Post Office Box 597 St. Thomas, U.S. Virgin Islands 00801-0597 Office of the Commissioner Department of Conservation and Cultural Affairs 179 Altona & Weigunst Charlotte Amalie, St. Thomas, U.S. Virgin Islands 00801 Director, Public Relations Office Government of the U.S. Virgin Islands St. Thomas, U.S. Virgin Islands 00801 Commissioner Virgin Islands Department of Commerce Post Office Box 1692 St. Thomas, U.S. Virgin Islands 00801-1692 Commissioner of Public Works Government of the U.S. Virgin Islands Post Office Box 4400 St. Thomas, U.S. Virgin Islands 00801 Regional Director U.S. Fish and Wildlife Service 75 Spring Street Southwest Atlanta, Georgia 30303-3309 Field Supervisor u.s. Fish and Wildlife Service Caribbean Field Office Post Office Box 491 Boqueron, Puerto Rico 00622-0491 Virgin Island Housing Authority Post Office Box 979 St. Thomas, U.S. Virgin Islands 00801-0979 Chief, Caribbean District, WRD U.S. Geological Survey GPO Box 4424 San Juan, Puerto Rico 00936 Executive Director Virgin Islands Urban Renewal Board Post Office Box 2295 St. Thomas, U.S. Virgin Islands 00801 Mr. William Tobias Division of Fish and Wildlife Box 1878, Frederiksted St. Croix, U.S. Virgin Islands 00840 Director Virgin Islands Planning Office Chinnery Building 129-133 Sub-Base St. Thomas, U.S. Virgin Islands 00801-5000 Mr. O'Neal A. Abel Assistant Commissioner Department of Public Works Post Office Box H, Christiansted St. Croix, U.S. Virgin Islands 00820 Assistant Commissioner Department of Agriculture Post Office Box 82 St. Thomas, U.S. Virgin Islands 00801-0082 Director of Tourism Post Office Box 1692 St. Thomas, U.S. Virgin Islands 00801-1692 San Juan Area Office U.S. Army Corps of Engineers ATTN: SAJPG 400 Fernandez Juncos Avenue San Juan, Puerto Rico 00901-3299 State Historic Preservation Officer Virgin Islands Planning Office Division for Archeology & Historic Preservation Chinnery Building 129-133 Sub-Base St. Thomas, U.S. Virgin Islands 00801-5000 Mr. Benjamin Nazario, P.E. Director Coastal Zone Managment Division Department of Conservation and Cultural Affairs 179 Altona & Weigunst Charlotte Amalie, St. Thomas, U.S. Virgin Islands 00801 Mr. Gabriel St. Surin Special Assistant Department of Public Works Government of the U.S. Virgin Islands Post Office Box 4400 St. Thomas, U.S. Virgin Islands 00801 6.01 A scoping letter (dated September 5, 1984} and a copy of the Draft Report and Environmental Assessment with cover letter (dated May 29, 1987} were sent to the addressees listed in section 6.00. Copies of the letters of response are in appendix G of the main report. 6 6.02 Issues raised by letters of response and the Corps' responses are addressed below. (a) U.S. Environmental Protection Agency (EPA) letter dated October 18, 1984: Any effect on wetlands as a result of this project will require application of 404(b)(1) Guidelines. Corps' response: No wetland areas will be affected by the alternative plans being considered. (b) EPA letter dated August 13, 1987: 1. Information should be provided to support the conclusion that the Salt River Bay mangrove and salt pond wetlands will not be adversely affected. Corps' response: The Salt River Bay wetland area now receives the fresh- water runoff that flows through the project area through the existing chan- nels (Canaan Gut and Little Fountain Gut) and, when the drainoff water volume exceeds these channels' capacity, overland through Mon Bijou. The proposed flood control measures will only remove the requirement for the water to flow overland through Mon Bijou. No significant change in the volume of water flowing to the wetland will occur, and the only possible change in fresh water quality entering the wetland area would be a reduction in the amount of domestic pollution picked-up enroute to the wetland area. 2. The clearing of lower channels leading into Salt River Bay should be added to the plan as requested in the EPA July 21, 1982 letter. Corps' response: The study of any action unrelated to containing and draining flood waters from the Estate Mon Bijou area would be beyond the scope of this study and, therefore, cannot be added to the plan. 3. Destruction of·soil retention vegetation should be prevented. Corps' response: No vegetation outside the selected plan's channel align- ment and immediate work areas would be significantly damaged. 4. Pre-historic sites at Glynn I and Lebanon Dam should not be disturbed. Corps' response: A cultural resources survey of the selected plan's channel alignment concluded only insignificant effects on Glynn I and Lebanon Dam would be expected as a result of the plan. 7.00 Conclusion: This project will not cause a significant impact on the human environment, because there are no significant habitats, wildlife con- centrations, or other valuable environmental characteristics in the path of the selected channel route or close enough to be affected by the necessary construction activities. An Environmental Impact Statement will not be required for this project. 7 00 TABLE 1 RELATIONSHIP OF PLANS TO ENVIRONMENTAL PROTECTION STATUTES AND OTHER ENVIRONMENTAL REQUIREMENTS ESTATE MON BIJOU, ST. CROIX, V.I., FLOOD CONTROL STUDY, 1987 Selected Plan: Construction of a Bypass Channel - Plan S-1 Plan S-1 Plan S-2 Plan S-3 Plan S-4 Plan S-5 Federal Statutes Archeological and Historic Preservation Act, as amended, 16 u.s.c. 469, .!!..!!!l.e Full Full Full Full Non 1! Clean Air Act, as amended, 42 u.s.c. 1857h-7, et ~· Full Full Full Full Full Clean Water Act, as amended, (Federal Water Pollution Control Act> 33 u.s.c. 1251, .!!.~· Full Full Full Full Full Coastal Zone Management Act, as amended, 16 u.s.c. 1451, .!!..~· N/A N/A N/A N/A N/A Endangered Species Act, as amended, 16 u.s.c. 1531, .!!...!!!!l• Full Full Full Full Full Estuary Protection Act, 16 u.s.c. 1221, .!!...!!!l.e N/A N/A N/A N/A N/A Federal Water Project Recreation Act, as amended, 16 u.s.c. 4601-(12), .!!...!!!!l• N/A N/A N/A N/A N/A Fish and Wildlife Coordination Act, as amended, 16 u.s.c. 661, et .!!!!l• Full Full Full Full Full Land and Water Conservation Fund Act, as amended, 16 u.s,c. 4601 - 4601-11, .!!...!!!!l• Fu II Full Full Full Full Marine Protection, Research, and Sanctuaries Act, 33 u.s.c. 1401, et .!!!!l• N/A N/A N/A N/A N/A National Envlronmenhl Polley Act, as amended, 42 u.s.c. 4321, et .!!!!l• Full Full Full Full Full National Historic Preservation Act, as amended, 16 u.s.c. 470a, et .!!!!l• Fu II Fu II Full Full Full Rivers and Harbors Act, 33 u.s.c. 401, .!!..!!!!l• N/A N/A N/A N/A N/A Watershed Protection and Flood Prevention Act, 16 u.s.c. 1001, .!!...!!!!l• N/A N/A N/A N/A N/A Wild and Scenic Rivers Act, as amended, 16 u.s.c. 1271, .!!..!!!!l• N/A N/A N/A N/A N/A Executive Order, Memoranda, etc. Floodplain Management (E.O. 11988) Fu II Full Full Full Full Protection of Wetlands (E.O. 11990) N/A N/A N/A N/A N/A Analysis of Impacts on Prime and Unique Farmlands (CEO Memorandum, 11 Aug 80) N/A N/A N/A N/A N/A NOTES: For each Item listed enter one of the following: a. Full Compliance. Having met all requirements of the statute, E.O., or other environmental requirements for the current staQe of planning (either preauthorlzatlon of postauthorlzatlon>. • b. Partial Compliance. Not having met some of the requirements that normally are met In the current stage of planning. Partial compliance entries should be explained In appropriate places In the report and/or EA and referenced In the table. c. Noncompliance. VIolation of a requirement of the Statute, E.O., or other environmental requirement. Noncompliance entries should be explained In appropriate places In the report and/or EA and referenced In the table. d. Not applicable. No requlr~nts for the Statute, E.O., or other environmental requirement for the current staQe of planning. 1/ - A culturl'll rAo;curcl'!<; o;urvey h"o; not h-mn OArformed for the S-5 route; how"!ver, a surv"!y would be p<!rformed If this alternative route Is selected • e • ~',. - ....... ,~ ( I I I I '- • 1- 0:: 0 a,. (/) 0 z <{ ...J (/) UJ ::::>- 10 a: 0 01- :2~ N u me> z UJ z ~ 0..., 0 > -0 ~ 1-a::"""'. ua.. w~ w 0 !i ::::> (/)UJ ..... ~ ...J rn x <:( UJ 0 I- a: w u 0 ....= (/) <( w Q: <t "-- --/ I I • ( '' ) 0 z w _j LL.. ~~1 e INLET'' CHA,NNEt:. ~~ #""" e - SECT ION ' 205 DETA fLED PROJECT REPORT ESTATE MON BIJOU ST CR OI X , U. S V IRG IN I SLANDS SELECT-ED PLAN BYPASS CHANN! L DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE, FLORIDA FILE NO 109-34,414 e e - ~---------------,-------------------------------------------------------------------------------------------------------------------------------------------------------------~ -, FLOW ..... .__ -- ......4 ' Typico I Levee Height Varies 15' M hlC, iLti Varies--.~. ~ 75' 1/S;;;tlt=::f/F-r ... j (30FT.) SECTION A-A r:rr::tfl11111111~ A~ 1/SJ/E!!/1§// Hc=44'(3JJ . I f)' I ~I ~ 1's =11111@]1~111111111111111 ~ j __bit I Cut Off Wall 1 T!o' .. 9.0' • • 26.0: .. 1 .. 9.0' ... 1~~~. jS.O' .,.jA ~ 6.0' (18.6) 6.0 1 ( 2.0) PROFILE ~ T T r _J T_J ."""" - v I__,..... • r-L...- 12"Gobion Lining_> - ~-- 0 0 -~ ~ - 1- 0 - tri ·~ I'- rt) -- ..... - !. ~ .....-- ...j ~ l. .J.. ~ 1 1 1 -L- ~ ~ J ~ ...j .4 lV on 3H PLAN VIEW t -------· ·~ -·····•·•··• ···• ··~ _, SECTION 20~ DETAILED PROJECT R£POftT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS PLAN DETAILS DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE, FLORIDA FILE NO. IOtt.- 34, 414 PLATE 3 • 180 f70 160 e ~ ..J ~ ~ ._ 1- ItO LL z 0 ~ > IU ..J IU e. ,., .... ~I.) i Ql&.l ., ~~ 1&.1 C) UJCL 0 iX I ID LEVEE I ''--. \ .... _, ·---.'-- .... , \ '- .... , ~ '--, ·...___., '--.... -..... '--, "-""". ' --, --------. '--, -..._ .......... , '--- '--.... . '--, '--, LEGEND 7f7'iW/Iflllf/SII llllfllllllf EXISTING GROUND DESIGN WATER SURFACE DESIGN INVERT ELEVATION MINIMUM REOUIREO t.EVEE GRADE ..L 60+00 ....L 50+00 '--, ..L 40+00 STATIO~ tFT). 30-:l:oo (\j d z UJ C) 0 a: ID 0 ..J z UJ UJ z C) z 0 <( - J: a: 1.) II) .... UJ ..J z J: .... ~ z 0 ~ 1.) z :::> .., r ....L 20+00 ...L" · to-too· ..... i--- ·-·. ~- ---~­ L&J ..... > ~ -~-• II) ·%··--··~-----+-- .... .:~ z :o ·~ t ~ • ~ - ~ - - ~ • - .: ::~r·· z .::1 ., :: : : : 1 .. : : ~-~ ~ ~~ ~--... ---~--- .. -. -~----·-------- : l .j •• -- 1 t . ~ . ~··-•···- -~~-::... SECTION 205 OETAILlD ~J£CT MfiOftT ESTATE MON IIJOU ST. CltOIX, U.S. VIRGIN ISLANDS WITH PROJECT PERFORMANCE OE ..... TM[NT OF THE ARMY .IACICIC*VILI.I DIITitiCT, COtt~l M EIMIIIEEttl .IACKIC*VILLI, P'LOitiOA P'IL.E lfO. IOe-14,414 PLATE 4 e e e ""'' . ' ·,1{ 1/ j ·(' ', I.·.-- /_jl c ., I I/"/ : I \~~~-.;);r -~"--~ ,,(.I _...~- ,. , .. --AOO '-....., / -___.:.:--: .I . ~~ ~~- >-· I /~ __ '_./ \ ' ; \ \ -~·-;.~ .. 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VIRGIN ISLANDS i,~=;J \ di STUDY AREA DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE, FLORIDA FILE NO.I09-34.414 PLATE J ~~~ ·<j;: e e e N SECTION ' 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST CROIX, LJ . S VIRGIN I SLANDS SELECT-ED PLAN BYPASS CHANNEL DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE, FLORIDA F'ILE NO 109-34,414 .. e e ~ ., .................... ------~--~~~,,~~-~-·-·~·~·~,,~~~------------------------------.............................................................................................................................................................................................................................................................................................. .. FLOW....,. -- ' Typica I Levee Height Varies 15' M J.ILCIILCS Vories--1.. I 75' /lliiiiii11E:1/F-I ~ • (30FT.) SECTION A-A o:n9'1111111~ A~ 1/BI/S/I/i;i/( Hc=~'(3J) , 1.0' I ~~ ~ 1's · · · ~lttll@]l~ttllttllltllllt ~ l _bit I Cut Off Wall 1 ho• ··- 9.o' •• 26.o: ~!. 9.o' .1~1. 1a.o· .. jA__.J 6.0' 08.6} 6.0' (2.0) PROFILE f T T T T J -., / ,-.....-- ,..._ ~ 12"Gobion Lining j ~ ~ ~ 0 0 v. - - - tO 0 Ul ,..._ rt) ~ -- - ' ~ ~ L-r- I.. II.. ..l ~ ...... 1 1 l _L. J J lV on 3H PLAN VIEW :t . ~"" . SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX , U.S. VIRGIN ISLANDS PLAN DETAILS DEPARTMENT OF THE ARMY JACI<SONVILLE DISTRICT, CORttS Of' ENGINEERS JACKSONVILLE, FLORIDA FILE NO. lOt,- S4, 414 PLATE 3 e 180 f7-() 160 ·~ e ~ ...J <I! 120 ~ --I- 110 LL z 0 I- <( > 11.1 ...J w .e 1- II.~ o.., 0~ ~Q. I rtl ~ LIJ C) 0 a: m LEVEE I -~ \.__, '-., '--.,. '--\ '- .... , ~ '--, •....._., / '--, ---.. '--, ·~. ' --, ------,.---- '--, ...... -, "--- '--, ."-- '--, \ "--, '--.'---- '--, '\_ '--- .\ '--, ---., LEGEND N 0 z LIJ C) 0 0: m II F:!SII$!ill f!!!i!f/1 EXISTING GROUND DESIGN WATER SURFACE ' '---·~ --,_..,.'\. .... -~ '--, . '--""""' -~'"---..,....,,. '---'\. ·---....: 0 ..J z LIJ z LIJ z C) < e J: 0: 0 ji) 1- ~ z J: 1- ~ ~ j: u z ~ l ~ffi- > ir .... ·.;;~· c( II) %• 1- .:~ z 2 ...... -j. . i. - .. t-- . -.. ::l f... ~ ... J. ------~--:~---~-~~-~---· i 1111111111 II DESIGN INVERT ELEVATION MINIMUM REOUIREO lEVEE GRADE '---,'--,. -.'---. '--,'---,'---, . ~- .... \~.--· '- ,__- "\ ' . . '----.;: ' .... _... . . . . \ --, t ~-- --- 1':==-====,z__-+--- .... -L------------~----- I. t ~- -~ . t I . . I _L 60+00 ...L 50+00 ..L 40+00 STATIQ~ (f'Tt · 30-ioo . ...L 20+00 ~­ io+oo I I .:..1.:. .... "0+00 --~ -~ --- SECTION 205 OE:TAIL£0 llf'OJf:CT M~ ESTATE MOH IIJOU ST. "'OIX , U.S. VlltGIN ISLANDS WITH PROJECT PERFORMANCE OE:~TMlNT OF THE ARMY .IACKIOttVILI.I DISTitiCT, COit .. l Of' I ... INIIItl "'ACKIOMVILLI, 'LOitiOA '"'' 110. .......... PLATE 4 - l e LEGEND I I FLOODED AREA WATER SURFACE 40.2---ELEVATION, FT., M.S.L. .,........--.._ __ WATER SURFACE CONTROL N t GRAPHIC SCALE 200' 0 200 ' 400' SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX A FLOODED AREA MAP EXISTING CONDITIONS 100- YEAR DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT CORPS OF ENGINEERS JACKSONVILLE FLORIDA D.O. FILE NO. 109-34,414 PLATE 5 e e - ~ LEGEND I I FLOODED AREA WATER SURFACE ----ELEVATION, FT., M.S.L. --WATER SURFACE CONTROL N t GRAPHIC SCALE 200' 0 200' 400' SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX A FLOODED AREA MAP WITH PROJECT 100- YEAR DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT CORPS OF ENGINEERS JACKSONVILLE FLORIDA L----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------1----------------------~D~ . O~.~F~IL~E~NQ 109-34 ,4 14 PLATE 6 e e e se:crroN' !05 OETA il£0 PROJeCT RePORT ESTATE IIftON BIJOll ST. CROIX, U.S VlRGtN tSLA~O.S ALTERNATIVE PLAN NONSTRUCTURAL PLAN OEPARTMENT OF THE .ARMY JA\CK$0t\IVH •• L'E DI.Sm!Ct,_ t~~ Off ~~-$ JP,CK$0NVttL~,,ft.Mtt>A 7 • II J 01 • 0 .. Q z z I ~ w a: ~~ ' ..,5_ w et~t..,z a.. ~~- I ot-- a.. N me :::J lllz! ~a?> _.l I'll~ -~~:~. w tLw - z i I .., !;i=> z .01-' ~ <( lr 11.1(1))( I :!wa (..) ~ ~ z 11.1 (.) 0 .,_; w a.. ., 0 , • Ce re E 0 0 "' : E 0 0 PLATE 10 Vl LU u 0::: :=1 0 c./') LU 0::: ....J C( 0::: ::::> 1- ....J :=1 u • DETAILED PROJECT REPORT SUPPORTING DATA FOR MON BIJOU ST. CROIX, VIRGIN ISLANDS The supporting data for the Mon Bijou study is arranged into Appendices based on subject matter. Each appendix furnishes detailed information on the technical aspects of the studies conducted and the plans considered. The Appendices are arranged in the following order: A - HYDROLOGY AND HYDRAULICS -B - GEOTECHNICAL AND MATERIALS C - RECREATION ASSESSMENT D - ENGINEERING, DESIGN, AND COST ESTIMATES E - ECONOMIC ANALYSIS F - CULTURAL RESOURCES G - LOCAL COOPERATION AND PUBLIC INVOLVEMENT SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX A HYDROLOGY - HYDRAULICS SECTION 205 DETAILED PROJECT Rf/)RT ESTATE MON BIJOU ST. CROIX, U.s. VIRGIN ISLANDS APPENDIX A HYDROLOGY - HYDRAULICS TABLE OF CONTENTS A. INTRODUCTION B. HYDROLOGY Watershed Description Previous Hydrologic Studies Unit Hydrograph Analysis Rai nfa 11 Design Rainfall Results C. HYDRAULICS Existing Conditions Study Area Hydraulic Model Development of the Model Hydraulic Design Criteria General Design Water Surface Profiles Channel Characteristics Starting Conditions Cross Sections Transitions Roughness Coefficient Alignment Superelevation Freeboard Stilling Basin Bridges Debris Basin Drop Structures Inlet Structures Gabion Drop Structures Hydraulic Design of Alternative Plans General Nonstructural Plan Concrete Culvert Plan A-i PAGE NO. A-1 A-1 A-1 A-1 A-1 A-3 A-3 A-4 A-5 A-5 A-5 A-5 A-5 A-5 A-5 A-6 A-6 A-6 A-6 A-6 A-6 A-6 A-6 A-6 A-7 A-7 A-7 A-7 A-7 A-8 A-8 A-8 A-ll A-1 A-2 A-3 A-4 A-5 A-6 A-7 A-1 A-2 A-1 A-2 A-3 A-4 A-5 TABLE OF CONTENTS (Continued) Partial Bypass Earthen Bypass With Gabion Drop Structures Proposed Plan Channels Main Channel Inlet Channel Gabion Drop Structures Bridges LIST OF TABLES Summary of Hydrologic Parameters Peak Rainfall-Frequency at Mon Bijou Summary and Comparison of Discharge Average Depths and Velocities for Nonstructural Plan Summary of Hydraulic Design Data for Channels Summary of Hydraulic Design Data for Inlet Channel Surmary of Hydraulic Design Data for Bridges LIST OF FIGURES Drainage Basins Distribution of Discharge and Flow Area at a Cross Section - Existing Condition LIST OF PLATES (Plates follow text) - Flood Profiles Flooded Area Map - Existing Conditions - 10-Year Flood Flooded Area Map - Existing Conditions - 100-Year Flood Flooded Area Map - Existing Conditions - Standard Project Main Channel - Hydraulic Design Profile A-ii PAGE NO. A-ll A-ll A-ll A-ll A-ll A-ll A-ll A-12 A-3 A-4 A-4 A-9 A-13 A-18 A-19 PAGE NO. A-2 A-10 Flood A. INTRODUCTION 1. This appendix presents the basic hydrologic data and studies which were conducted to define the hydraulics of Salt River and its main tributaries at Mon Bijou, St. Croix, under existing conditions and with various flOod pro- tection plans in place. B. HYDROLOGY 2. Watershed Description. Mon Bijou is located in north central St. Croix, U.S. Virgin Islands, at the foot of Canaan Gut in the upper end of Salt River Basin. Canaan Gut collects runoff from 440 acres on the steep eastern slopes of Blue Mountain. This small watershed drops 1,000 feet in elevation over a length of 1.6 miles. The lateral slopes of Canaan Gut•s V-shaped basin are even-steeper; averaging about 35 percent. Canaan Gut beqins to fan out into a floodolain just above Mon Bijou where it is joined by a smaller but similar watershed known as Little Fountain Gut. Together they comprise a drainage area above Mon Bijou of less than 1 square mile. Through Mon Bijou and below, Canaan Gut collects another 0.3 square miles of drainage area. About 1 mile below Mon Bijou, Canaan Gut is joined by two other tributaries. The total drainage area at this junction is 2.45 square miles. Figure A-1 delineates the drainage basin and subbasins in the study area. 3. Previous Hydrologic Studies. A report entitled, "A Flood Damage Mitigation Plan for the U.s. Virgin Islands," dated April 1981, was prepared by CH2M Hill, an engineering firm in Gainesville, Florida. The report was prepared for the Disaster Preparedness Office of the Governor of the -Virgin Islands. In part, the report contains a detailed hydrologic evaluation of Salt River Basin, with a view towards providing a bypass channel around Mon Bijou. 4. A report entitled, "Flood Insurance Study U.S. Virgin Islands, Island of St. Croix," dated April 1980, was prepared by the firm Tippets-Abbett-McCarthy-Stratton (TAMS) under contract with the Federal Emergency Management Agency. The study includes a detailed hydrologic eval- uation of the Salt River Basin. 5. Unit Hydrograph Analysis. Hydrology of the Mon Bijou area involves the determination of peak rates of supercritical flow f~om small basins of less than 1 square mile with basin slopes of up to 35 percent. There are no data upon which to calibrate a rainfall-runoff model; nor are there any synthetic method specifically designed for flash flood analysis in the Virgin Islands. In past studies of small basins in Puerto Rico and the Virgin Islands, numerous synthetic methods have been used. Several of these methods were reviewed and the U.S. Soil Conservation Service (SCS) small watershed ap- proach was selected. The SCS method has widespread acceptance and use and has the advantage over some of the other methods, in that it was developed for small drainage areas. Hydrologic computations were performed with the A-1 MON BIJOU SALT RIVER DRAINAGE BASIN FIGURE A-1 use .of HEC-1 flood hydrograph package. Flood routings were accompli shed by the modified puls option of HEC-1 from discharge-storage data produced by HEC-2 backwater profiles~ Table A-1 lists the hydrologic parameters for subbasins in the Salt River basin. TABLE A-1 Summary of Hydrologic Parameters DA L Basin Slope Lag scs Subbasin {sg.mi.) (mi.) % Minutes Curve # #1 Canaan Gut • 70 1.6 35.0 16 83 2 Little Fountain Gut .16 .95 31.0 11 84 3 Lebanon Hi 11 .12 .50 20.0 9 81 4 Bonne Esperance .54 1.23 37.0 13 82 5 Lower Canaan Gut .27 1.08 7.8 27 80 6 Frieden sfe 1 d .59 1.48 9.5 36 78 7 .07 .40 2.8 22 78 8 .36 1.46 20.0 22 80 9 .18 .53 5.2 21 76 10 .29 1.29 20.0 20 79 11 .11 .59 8.8 19 74 12 .38 1.42 26.0 20 78 13 .34 .66 6.5 26 72 14 .43 .53 30.0 17 72 6. Rainfall Losses. Rainfall losses were accounted for by the SCS curve number procedure using antecedent moisture condition II. Curve numbers varied between 80 and 84 in the upper basin above Mon Bijou and from 72 to 80 below the project area. 7. Design Rainfall. Six-hour design rainfall for 2-year to SPF were estimated from isohyetal maps in Weather Bureau Technical Paper No. 42, (TP-42), "Generalized Estimates of Probable Maximum Precipitation and Rainfall Frequency Data for Puerto Rico and Vir~in Islands." TP-42 contains isohyetal maps for duration from 30 minutes to 4 hours. Technical Paper No. 25 (TP-25) "Rainfall Intensity-Duration-Freguency Curves" was used to distribute the design rainfall into 5-minute increments. TP-25 gives rain- fall frequency down to 5-minute intervals for various rainfall stations in the United States and San Juan, Puerto Rico. The depth duration of the design storm for the peak 1 hour was patterned after the gauge at San Juan, Puerto Rico. The distribution of the 5-minute intervals were arranged in a critical 11, 9, 7, 5, 3, 1, 2, 4, 6, 8, 10, 12 order. Table A-2 lists peak rainfall rates for various return periods. A-3 TABLE A-2 Peak Rainfall-Freguency at Mon Bijou Return Period (years) Duration 2 5 10 25 50 100 SPS 5-minute .32 .42 .51 .62 .72 .81 1.26 1-hour 2.0 2.6 3.1 3.8 4.4 5.0 7.7 6-hour 3.6 4.7 5.7 6.9 8.0 9.0 14.0 8. Results. Table A-3 lists the discharge frequency at two locations along Canaan Gut. Also shown are the results of the two previous studies. The TAMS study used the same SCS small watershed method with SCS curve number techniques. The primary different between the TAMS study and the analysis in this report is in the rainfall distribution and time intervals. TAMS used 30-minute computation intervals compared to a 5-minute computation interval used in this study. The study by CH2M Hill used an empirical lag equation (Lag= .65A•403), and 10-minute computation intervals. The lag equation compared reasonably well with the SCS method on all but the extremely steep subbasins. TABLE A-3 Summary and Comparison of Discharges (CFS) At Confluence of Canaan Gut and Little Fountain Gut, DA = 0.86 sq. mi. This study TAMS CH2MHill 10-year 1,830 1,441 1,700 At Bottom of Canaan Gut DA 2.45 sq. mi. This study TAMS CH2MHill Note: NA means Not Available. 10-year 4,110 NA 3,650 A-4 50-year 100-year SPF 2,840 3,270 5,390 2,538 3,150 NA 2,390 2,790 NA 50-year 100-year SPF 6,560 7,605 12,803 NA NA NA 5,330 6,280 NA C. HYDRAULICS Existing Conditions. 9. Study Area. The study area consists of the 4,400-foot reach of Canaan Gut and Salt River which passes through the residential areas of Glynn and Mon Bijou. The primary cause of flooding in the residential area is due to construction infringement into, and in some areas total elimina- tion of, the natural floodway of Salt River. The principal hydraulic feature in the area is a 700-foot-long, 4-foot by 6-foot concrete box culvert in the west end of Mon Bijou. This culvert is the sole means of conveying flows from upstream runoff through the area. The limited capacity of the culvert is usually further reduced by debris blockage. As a result, flood flows sweep over the low culvert headwall into the streets and houses of Mon Bijou before reentering the natural watercourse downstream. Flooding is further aggravated by the minimal capacity of a 2-foot by 4-foot highway culvert located about 200 feet upstream ef the residential area and by runoff from Little Fountain Gut, a tributary, to the north passing uncontrolled over the main highway into houses and streets in the northwest portion of Mon Bijou. 10. Hydraulic Model. Water surface profiles were developed for existing condit1ons us1ng the Hydrologic Engineering Center HEC-2 Computer Program "Water Surface Profiles." This program was developed to calculate subcriti- cal and supercritical water surface profiles in natural or manmade channels of any cross section for steady gradually varied flow. The computational procedure is based on the solution of the one dimensional energy equation. This method applies Bernoullis Theorem for the total energy at each cross section and uses Manning's formula to determine the frictional head loss between cross sections. This procedure is generally known as the Standard Step Method. 11. Development of the Model. The HEC-2 hydraulic model was formed using 19 cross sect1ons from aerial topography flown in January 1983. The topography had a scale of 1 inch equals 50 feet with 2-foot contour inter- vals. Mean high water of 0.2 feet, msl, was used as a starting condition in Sugar Bay at the mouth of Salt River. Manning "n" values were calibrated from the flood of October 8, 1977, which was estimated to be a 25-year flood in the study area. Verified Manning's "n" values varied from 0.055 to 0.095 for the main channel and 0.100 to 0.300 for overbank areas. This model was then used to develop 2-, 5-, 10-, 25-, so-, and 100-year and Standard Project Flood Profiles using hydrologic data previously discussed. The existing condition hydraulic profiles are shown on plate A-1 and flooded areas are shown on plates A-2, 3, and 4 for the 10 year, 100 year, and Standard Project floods, respectively. Hydraulic Design Criteria. 12. General. Hydraulic design criteria and procedures used herein are in accordance with standard engineering practice and applicable provisions of Corps Engineering Manuals and the Waterways Experimental Station "Hydraulic Design Criteria" relative to design and construction of Civil Works Projects. A-5 Engineering criteria adopted to meet special local conditions are in accor- dance with that previously approved for similar projects. 13. Design Water Surface Profiles. The most significant factor affecting design criteria of the water surface profiles is that Estate Mon Bijou lies directly in the path of the Salt River watercourse with minimal capacity for flood flow conveyance in the culvert under the development. Because of this, primary consideration was given to diversion plans to minimize impacts on local residences, highways, bridges, and utilities. 14. Channel Characteristics. The below listed criteria were used in the analysis of various plans involving channel modification. a. Starting conditions. Flow downstream of the study area is predomi- nantly subcritical. The starting condition for downstream considerations was an elevation of 0.18 feet, msl, in Sugar Bay, which is the mean high tide, with back water computations extending upstream to the junction of the bypass design with the natural channel. b. Cross Sections. The most efficient hydraulic section was used to convey flows in-bank for the design flood within geologic constraints of side slope stability, maximum allowable velocities and maximum depth of economic excavation. c. Transitions. Transitions would be provided at all changes in channel geometry. d. Roughness Coefficient. Manning's "n" values of 0.013, 0.030, and 0.035 were used for concrete, gabion, and earthen sections, respectively. e. Alignment. The design alignment would minimize the required real estate acquis1tions and conform to minimum radius criteria outlined in "Hydraulic Design of Flood Control Channels," EM 1110-2-1601. f. Superelevation. Invert banking would be provided for all curved concrete channels in conjunction with spiral transitions to insure flow stability and minimize the total rise in water surface between the channel center line and outside wall. g. Freeboard. A minimum freeboard allowance of 1 foot above the design water surface elevation was used as a basis of setting the top of channel elevation. h. Stilling Basin. The stilling basins were designed to contain the change of flow regimen. Hydraulic design of the stilling basins conform with standard design criteria and procedures established in Engineering Manuals EM 1110-2-1601, "Hydraulic Design of Flood Control Channels," EM 1110-2-1602, "Hydraulic Design of Reservoir Outlet Structures," and EM 1110-2-1603, "Hydraulic Design of Spillways." A-6 i. Bridges. Bridges were analyzed to insure acceptable flow charac- teristics in terms of acceptable net velocities, flow stability, and flow depth. In areas of subcritical flow, piers having semicircular nose and tail were designed to not restrain this net flow area by more than 10 per- cent. In areas having supercritical flow, bridges were required to be full span. Bridge low chord was set to be a minimum of 1-foot above the design water surface elevation. j. Debris Basin. A leveed debris basin would be required at the upstream end of the project for concrete channel alternatives. For this study, the required basin was sized based on a drainage area proportion com- pared to those used for the Portugues and Bucana Project in Ponce, Puerto Rico. Detailed designs of debris basins would include consideration that a major flood event could occur almost any time of the year and annual sedi- : ment yields could reach the project in one event with little or no sediment the remainder of the year. Consideration would also be given to sediment gradation to insure that gravels and cobbles would not damage concrete_ lining and stilling basins. k. Sheet Pile Drop Structures. The 12 drop structures used in the earthern bypass alternative plan were designed in accordance with criteria set forth in EM 1110-2-1601, Hydraulic Design of Flood Control Channels, Appendix III, plate 43. This criteria was limited to design head of 6 feet for sheet pile weir construction in accordance with procedures used for grade stabilization structures in the Tennessee Tombigbee project. Sheet pile CIT type drop structures having a height of 10 feet were considered as an alternative plan; however, the total initial cost of $5,100,000 was not economically justified. 1. Inlet Structures. Inlet structures would be provided for some alternat1ves at ex1st1ng inflow points. These structures would consist of corrugated metal pipe culverts with stoplog risers to control inflow into the canal. The structures would be designed to convey runoff during a 10-year storm with entrance and exit losses totaling 1.69 times the velocity head and barrel friction based on Manning's formula with an "n" value of 0.024. m. Gabion Drop Structures. The 34 gabion drop structures used in the proposed plan were designed in accordance with criteria set forth in ETL 1110-2-194, Gabion Channel Control Structures. Hydraulic Design of Alternative Plans. 15. General. Of the four plans presented in the plan formulation portion of the ma1n report, three structural plans and one nonstructural plan were found to be implementable. Hydraulic design considerations of the four plans follow. A-7 16. Nonstructural Plan. This plan consists of purchasing those residential propert1es located within the 5-year flood plain and relocating the residents elsewhere. Use of this measure would reduce flood damages to the most often flooded residences. Howe~er, flooding will continue. Flow velocities and water depths, after project implementation, in the overbank areas and near the channel are of great concern, therefore, HEC-2 computer model analysis for a variety of flood flows in these areas were performed and the results are presented in table A-4. The primary consideration in applying steady flow theory to the calculation of water surface profiles in natural rivers involves converting hydraulic parameters, which are distributed across complex sections, into averages. The flow velocity, which is required to· apply the energy equation, must be a representative average velocity for each cross section. The theory is applied by subdividing each cross section into separate portions, or subsections, as shown in Figure A-2. The velo- city within each subsection (V in FPS) is equal to the discharge (Q in CFS) ·divided by the area (A in square feet). For example, the velocity in the right overbank (ROB) area is equal to QROB/AROB. Average velocities and water depths from several cross sections of the study area were taken from the HEC-2 model output and are shown in table A-4. These are an indication of average velocities and water depths in the overbank areas. A-8 TABLE A-4 - AVERAGE DEPTH AND VELOCITIES FOR NONSTRUCTURAL PLAN Cross Section Frequency Average Depth Average Velocity Average Velocity Sector From To Flood Overbank (Ft.) Overbank ( FT /S) Near Channel 1 - D/S Glynn 11.20 12.20 2 Yr 0.30 0.05 4.40 10 Yr 2.20 0.40 6.50 100 Yr 3.10 0.50 8.00 2 - Glynn 12.20 14.10 2 Yr 0.20 0.05 5.80 10 Yr 1.80 0.10 7.20 100 Yr 2.90 0.10 9.00 3 - Glynn to Park 14.10 15.10 2 Yr 0.10 0.04 5.70 10 Yr 1.80 0.10 8.50 100 Yr 3.00 0.10 10.50 4 - U/S Glynn 15.10 17.02 2 Yr 0.10 0.04 7.20 10 Yr 1. 70 0.10 10.30 100 Yr 4.70 0.10 13.50 A-9 FIGURE A-2 DISTRIBUTION OF DISCHARGE AND FLOW AREA (A) AT A CROSS SECTION LEFT OVERBANK MAIN CHANNEL RIGHT OVERBANK (LOB) (MCH) (ROB) ws QMCH ,, \\.' /lr \.'- AMCH DEPTH QLOB QROB ALOB AROB "', \. , ..... A-10 17. Concrete Culvert Plan. This plan considered passing flood flows through the western part of t~on B1jou and would limit flood protection to the most damage prone area. In order to minimize impacts on local real estate, a channel design was based on slope controlled supercritical flow in a rec- tangular section. The channel would be about 1,125 feet long including a stilling basin near the downstream end and a gabion channel transition back to natural stream conditions. The covered concrete section would be about 461 feet long. A debris basin was located upstream of Mon Bijou in such a manner as to include runoff from Canaan Gut, the mainstream, and also Little Fountain Gut, a tributary north of the study area. The debris basin would keep rocks and abrasive material from entering the concrete channel and would serve as a check dam to insure stable conditions entering the concrete channel. 18. Partial Bypass. This plan included constructing a bypass channel parallel to the main north road and then through the residential area of Mon Bijou. The bypass would be about 2,300 feet long using a trapezoidal gabion-lined channel, designed for velocity control and using single, and double staged sheet pile drop structures. This plan would also require a standard project flood levee to protect the northern part of the i>'lon Bi jou area. 19. 'Earthen Bypass With Gabion Drop Structures. This plan considered a bypass channel north of the residential areas of Mon Bijou and Glynn using a trapezoidal earthen channel designed for velocity control and using 34 gabion drop structures. Proposed Plan. 20. Channels. a. Main Channel. The main channel would be about 6,500 feet long and have a trapezoidal grass-lined section with a 75-foot bottom width. At the downstream end, the channel would transition to natural stream conditions. A summary of hydraulic design data for the main channel is shown in table A-5 and a profile is shown on Plate A-5. b. Inlet Channel. This inlet channel would be about 350 feet long and have a trapezoidal grass-lined section with a 30-foot bottom width. A summary of hydraulic design data is shown in table A-6. c. Little Fountain Gut Inflow. Overland flow from Little Fountain Gut will enter the main channel between drop structures No. 28 and No. 29. The channel reach between the drop structures would be lined with gabion mattress. This channel reach would be about 200 feet long. 21. Gabion Drop Structures. Thirty-three gabion drop structures were used along the bypass channel and one drop structure for the drainage Area No. 4 inlet channel in order to minimize channel erosion by controlling the effec- tive gradient. These 34 structures were sized to pass the design discharge A-ll with the concurrent design headwater and tailwater elevations. The 33 bypass channel structures would have a crest length (L) of 101 feet and a crest height (He) of 4.39 feet. Plate 3 of the main report shows a plan detail of the gabion drop structures. A crest height (He) of 4.39 feet was selected in order to have a total head loss ( H) of 3.0 feet at this struc- ture. Reference is made to plate 2 and 3 of ETL 1110-2-194, a unit discharge (q) of 30 cfs/foot will correspond to a gross head on crest (H) of 4.5 feet. From plate 2, tailwater depth (h) relative to crest is equal to 1.5 feet (H- H). Then, with a tailwater depth of 5.89 feet minus (h) it will give an (He) of 4.39 feet. The remaining drop structure for the Area 4 inlet channel was scaled down as indicated in parentheses on plate 3 of the main report. 22. Bridges. Bridge sizes were developed to insure hydraulic efficiency based on net area provided below the design water surface elevation. Bridges in subcritical flow areas were designed to have a semi-circular nose and tail on piers. A summary of hydraulic design data for bridges is provided on table A-7. A-12 )> I 1-' w e Station 0+00 2+00 2+60 4+00 4+60 7+00 7+60 11+20 11+80 14+00 14+60 17+40 18+00 19+60 20+20 ----· Width(FT)I 75 75 75 75 75 75 75 75 75 75 75 75 75 75 ... 75 e TABLE A-5 SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNELS Water Surface Elevation Invert (FT. MSL) ( FT) MSL 60.8 54.9 61.1 55.2 64.6 58.7 66.0 60.1 69.0 63.1 69.2 63.3 72.2 66.3 73.0 67.1 76.0 70.1 77 .o 71.1 80.0 74.1 81.0 75.1 84.0 78.1 84.2 78.3 87.2 81.3 Side Slopes Left Right VELOCITY DISCHARGE 1 on 1 on ( FT /S) DEPTH (FT) (CFS) 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3,371 3 3 6.1 5.9 3'~371 -·--- -- ----- e LINING COMMENTS Junct1on w/Salt Grass River Ta 11 water Drop Structure # 1 Heactwa ter Drop Structure # 1 1 a11 water urop Structure # 2 Headwater Drop Structure # 2 Ta1lwater Drop Structure # 3 Heactwa ter Drop Structure # 3 Tallwater Drop Structure # 4 Headwater Drop Structure # 4 Ta 1 1 water Drop Structure # 5 Headwater Drop Structure # 5 1a11water urop Structure # 6 Heactwa ter Drop Structure # 6 Ta 11 water Drop Structure # 7 Heaawa ter Drop Structure # 7 Table Continued Next Page )> I ...... .p. e Station 20+60 21+60 22+20 23+80 24+40 24+80 25+60 26+20 27+60 28+00 29+20 29+80 31+00 Width(FT) 75 75 75 75 75 75 75 75 75 75 75 75 75 Water Surface TABLE A-5 SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNELS (Continued) • Side Slopes Elevation Invert Left Right VELOCITY DISCHARGE (FT. MSL) (FT) MSL 1 on 1 on ( FT /S) DEPTH (FT) (CFS) 87.2 81.3 3 3 6.1 5.9 3,371 87.4 81.5 3 3 6.1 5.9 3,371 90.4 84.5 3 3 6.1 5.9 3,371 91.4 85.5 3 3 6.1 5.9 3,371 94.0 88.1 3 3 6.1 5.9 3,371 94.5 88.6 3 3 6.1 5.9 3,371 95.0 89.1 3 3 6.1 5.9 3,371 98.0 92.1 3 3 6.1 5.9 3,371 98.2 92.3 3 3 6.1 5.9 3,371 101.2 95.3 3 3 6.1 5.9 3,371 102.0 96.1 3 3 6.1 5.9 3,371 105.0 99.1 3 3 6.1 5.9 3,371 105.2 99.3 3 3 6.1 5.9 3,371 --- ·- - - - - - - - -- - -- e LINING COMMENTS Grass Bridge No. 1 Ta11water Drop Structure # 8 Heaawa ter Drop StruCture # 8/ Junction W/ Inlet Channel Ta 11 water Drop Structure # 9 Heaawa ter Drop Structure # 9 Grass Bridge No. 2 1a11water Drop Structure # 10 Headwater Drop Structure # 10 1a11water urop Structure # 11 Headwater Drop Structure # 11 Ta 11 water Drop Structure # 12 Headwater urop Structure # 12 Ta 11 water Drop Structure # 13 e ):> I ..... (.]1 e Station 31+60 32+80 33+40 34+60 35+20 36+40 37+00 38+00 38+60 40+00 40+60 41+40 42+00 43+00 43+60 Width(FT) 75 75 75 75 75 75 75 75 75 75 75 75 75 75 75 --- Water Surface e TABLE A-5 SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNEL (Continued) Side Slopes Elevation Invert Left Right VELOCITY DISCHARGE (FT. MSL) (FT) MSL 1 on 1 on- (FT/S) DEPTH (FT) (CFS) 108.2 102.3 3 3 6.1 5.9 3,371 ' 109.0 103.1 3 3 6.1 5.9 3,371 112.0 106.1 3 3 6.1 5.9 3,371 112.2 106.3 3 3 6.1 5.9 3,371 115.2 109.3 3 3 6.1 5.9 3,371 116.0 110.1 3 3 6.1 5.9 3,371 119 .o 113.1 3 3 6.1 5.9 3,371 119.2 113.3 3 3 6.1 5.9 3,371 122.2 116.3 3 3 6.1 5.9 3,371 123.0 117.1 3 3 6.1 5.9 3,371 126.0 120.1 3 3 6.1 5.9 3,371 126.1 120.2 3 3 6.1 5.9 3,371 129.1 123.2 3 3 6.1 5.9 3,371 130.0 124.1 3 3 6.1 5.9 3,371 133.2 127.1 3 3 6.1 5.9 3,371 e LINING COMMENTS Headwater Drop Structure # 13 Ta1lwater Drop Structure # 14 Headwater Drop Structure # 14 Ta 11 water Drop Structure # 15 Headwater Drop Structure # 15 Ta1lwater Drop Structure # 16 Heactwa ter Drop Structure # 16 Ta1lwater Drop Structure # 17 Headwater Drop Structure # 17 Ta 11 water Drop Structure # 18 Headwater Drop Strli'Cture # 18 ra11water urop Structure # 19 Headwater Drop Structure # 19 Tailwater Drop I Structure # 20 Headwater Drop Structure # 20 )> I 1-' O"l Station 44+60 45+20 46+00 46+60 47+60 48+20 49+20 49+80 50+60 51+20 52+20 52+80 53+80 e Width(FT) 75 75 75 75 75 75 75 75 75 75 75 75 75 Water Surface 1/-\0LI:.. /-\-:> SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNEL (Continued) Side Slopes Elevation Invert Left Right VELOCITY DISCHARGE (FT. MSL) (FT) MSL 1 on- 1 on- ( FT /S) DEPTH ( FT) (CFS) 133.2 127.3 3 3 6.1 5.9 3,371 136.2 130.3 3 3 6.1 5.9 3,371 136.2 130.3 3 3 6.1 5.9 3,371 139.2 133.3 3 3 6.1 5.9 3,371 139.5 133.6 3 3 6.1 5.9 3,371 142.5 136.6 3 3 6.1 5.9 3,371 142.7 136.8 3 3 6.1 5.9 3,371 145.7 139.8 3 3 6.1 5.9 3,371 146.0 140.1 3 3 6.1 5.9 3,371 149.0 143.1 3 3 6.1 5.9 3,371 150.0 144.1 3 3 6.1 5.9 3,371 153.0 147.1 3 3 6.1 5.9 3,371 153.2 147.3 3 3 6.1 5.9 3,371 e LINING COMMENTS Ta11water Drop Structure # 21 Headwater LJrop Structure # 21 1a11water urop Structure # 22 Headwater Drop Structure # 22 Ta 11 water Drop Structare # 23 Heaawa ter urop Structure # 23 Ta1lwater Drop Structure # 24 Headwater Drop Structure # 24 Ta1lwater Drop Structure # 25 Headwater Drop Structure # 25 Ta1lwater Drop Structure # 26 Heaawa ter Drop Structure # 26 Tailwater Drop Structure # 27 e )> I t-' ....... e Station 54+40 55+40 56+00 57+00 57+60 58+60 59+20 60+00 60+60 61+40 62+00 63+00 63+60 64+60 Width(FT) 75 75 75 75 75 75 75 75 75 75 75 75 75 75 Water Surface e TABLE A-5 SUMMARY OF HYDRAULIC DESIGN DATA FOR CHANNEL (Continued) Side Slopes Elevation Invert Left Right VELOCITY DISCHARGE (FT. MSL) (FT) MSL 1 on 1 on (FT/S) DEPTH (FT) (CFS) 156.2 150.3 3 3 6.1 5.9 3,371 156.5 150.6 3 3 6.1 5.9 3,371 159.5 153.6 3 3 6.1 5.9 3,371 160.2 154.3 3 3 6.1 5.9 3,371 163.2 157.3 3 3 6.1 5.9 3,371 163.7 157.8 3 3 6.1 5.9 3,371 • 166.7 160.8 3 3 6.1 5.9 3,371 167.0 161.1 3 3 6 .• 1 5.9 3,371 170.0 164.1 3 3 6.1 5.9 3,371 170.2 164.3 3 3 6.1 5.9 3,371 173.2 167.3 3 3 6.1 5.9 3,371 173.5 167.6 3 3 6.1 5.9 3,371 176.5 170.6 3 3 6.1 5.9 3,371 177.0 171.1 3 3 6.1 5.9 3,371 e LINING COMMENTS Headwater Drop Structure # 27 Ta 11 water Drop Structure # 28 Headwater Drop Gabion Structure # 28 1 a 11 water Drop Gab ion Structure # 29 Headwater Drop Structure # 29 Ta11water Drop Structure # 30 Headwater Drop Structure # 30 Ta 11 water Drop Structure # 31 Headwater Drop Structure # 31/ Bridge No. 3 Ta 11 water urop Structure # 32 Headwater Drop Structure # 32 Ta 11 water Drop Structure·# 33 Headwater Drop Structure # 33 Trans1 t1on to Natura 1 Stream :J> I 1-' 00 e Station 23+00 23+75 24+00 25+25 Width(FT) 30 30 30 30 TABLE A-6 SUMMARY OF HYDRAULIC DESIGN DATA FOR INLET CHANNELS Water Surface Elevation Invert (FT. MSL) (FT) MSL 91.4 87.4 91.8 87.8 94.3 90.3 94.9 90.9 Side Slopes Left Right VELOCITY 1 on- 1 on- (FT/S) 3 3 7.0 3 3 7.0 3 3 7.0 3 3 7.0 e DISCHARGE DEPTH (FT) (CFS) 4.0 1,179 4.0 1,179 4.0 1,179 4.0 1,179 LINING COMMENTS Junct10n Wl th Grass Main Channe 1 1a11water Gabi on Control Grass S true ture No. 34 Heaawater Gabion Control Grass Structure No. 34 Up stream Terminus & Transition to Grass Natura 1 Stream e )> I ....... \0 • Bridge Name No. 1 No. 2 Station Design WSEL (Ft.) (FT. MSL) 20+60 87.20 60+60 170.00 -----·--- e e TABLE A-7 SUMMARY OF HYDRAULIC DESIGN DATA FOR BRIDGES APPROACH CHANNEL Max. Allow Vel. Min. Reqd. Bottom Bottom Min. Area Design Q Thru Bridge Low Width Elev. Side Reqd. Thru (CFS) (FT/S) Chord (FT) (FT. MSL) Slopes Bridge ( FT2) 3,371 6.00 88.20 75.0 81.30 1 on 3 506 3,371 6.00 171.00 75.0 164.10 1 on 3 506 e .J cri ~ e t-= u. .... ~ ~ L&J .J L&J e 190 180 170 160 110 90 eo .. 4f . •· ' ' I ~---r---: •· ' ' ' I •.. -. --- . r. -. 1 LEG§NQ ~- -. ·i:X-1-ST~~+GM·PRQFtLE. 2 YR FLOOD: PROFfLE - ---- ---- -IO·¥R~~-~PR0Fft.£. tOO'VR FLOO& PRORLE ---Jlf ·SPF·-··PROAL£ -~· 5400 ..... _j ·m· ~ ,..: 1&. •+ .... z 2 ; 1 ·W -~-~ ··----~-~~~ :> ' ' Wi .: ... : .J : . ~J!,L.~~~----+-- --~~ SECTION 205 DETAILED PROJECT REPORT . ·-r· :···-:. :~-; · ~ · ~T FLOOD PROFILE ·. -·----.11.· :'_···· ·5t: ' .. .. i'··-·-·-·--·1 ST.E::~~~~::=~~~NDS E i l l 1 : l l i i I t ' l l l : ; : ' ; p • ; - . .. - •• • ~ 'P~~· ··- --· --11 DEPARTMENT OF THE ARMY .y:· ·u.:.. . -'--~·..:.·· .. -·-··;:····· ... --·--·~:.. .J .. __ ..:...:.-- 1 ____ I I ·i , ,. I , _ _I_ , _ _~_ , '· JACKSONYILLEDISTIIttCT,COitltSO,.ENGINEl .. .JACKSONYILLR, ,-LORIDA DISTANCE UPSTREAM OF CROSS ,-ILE NO. 10.-14,414 PLATE A-1 \ " e e e LEGEND FLOODED AREA WATER SURFACE ....-----ELEVATION, FT., M.S.L. 40.2 ~WATER SURFACE CONTROL N 1 GRAPHIC SCALE 200' 0 200' 400' SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX A FLOODED AREA MAP EXISTING CONDITIONS 10- YEAR DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT CORPS OF ENGINE ERS JACKSONVILLE FLORIDA D. O. FILE NO. 109-34, 4 14 PLATE A- 2 e l e e LEGEND I I FLOODED AREA WATER SURFACE 40.2 ....----ELEVATION, FT., M.S.L. ~WATER SURFACE CONTROL N t GRAPHIC SCAL E 200' 0 200' 40 0 ' SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPEN DI X A FL OODED AREA MAP EXISTING CONDITIONS 100- YEAR DEPARTMENT OF THE ARMY .JACKSONVILLE DISTRICT CORPS OF ENGINEERS JACKSONVILLE FLORIDA D. O. FILE NO. 109-34,4 14 PL ATE A-3 e l e e LEGEND I I FLOODED AREA WATER SURFACE ---ELEVATION, FT., M.S.L. 40.2 ~WATER SURFACE CONTROL N t GRAPHIC SCALE 200' 0 200' 400 ' SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX A FLOODED AREA MAP EXISTING CONDITIONS SPF DEPARTMENT OF THE ARMY .JACKSONVILLE DISTRICT CORPS OF ENGINE ERS .JACKSONVILLE FLORIDA D.O. FILE NO. 109-3!i~ 4 1 4 PLATE A-4 e e - ~ ..J ~ ~ ._ 1-u. z 0 ~ > UJ ..J UJ IEK> 170 160 1- u.O ow ., oo za: wCL I ,., ~ w C> 0 a: ID LEVEE I ' \_,_ ...... _, .___,, '--.....__ '--\_ '--, -----.. '--, ......._., '--... -..... '--, ·~ '--, ·~ ' ·.....__, --, ....... _, ' LEGEND TfJ:S I/$!;/ I f!!!!/1/ EXISTING GROUND DESIGN WATER SURFACE DESIGN INVERT ELEVATION MINIMUM REQUIRED tEVEE GRADE ...L 60+00 ....L 50+00 _L 40+00 STATION (FT) ....L 30+00 (\j d z w C> 0 a: co d ..J z w w z C> z 0 <( - :I: a: 0 co 1-w ...J ~ :I: 1- ~ z 0 i= 0 z ;:) .., ....L 20+00 r L --- __L IO+oO ffi- > a: ..... ...J C( ~ %' ... ·-- 1- -~ z 2 ..... ~ :l ., .... __ ,_, ---------+----- : t . i. ____L ... 0+00 --~-.- SECTION 20~ OETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS WITH PROJECT PERFORMANCE DEPARTMENT OF THE ARMY ..IACKSONVILLI DISTitiCT, COit~S 0, IENGINIEEitS JACKSONVILLE, 'LOitiDA "LI NO. JOe- 14,414 PLATE A-5 SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX. U.S. VIRGIN ISLANDS APPENDIX B GEOTECHNICAL AND MATERIALS A. B. c. D. E. B-1 B-2 B-3 B-4 • B-5 B-6 SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX B GEOTECHNICAL AND MATERIALS TABLE OF CONTENTS INTRODUCTION LOCATION AND PHYSIOGRAPHY GEOLOGIC HISTORY INVESTIGATIONS PERFORMED Core Borings Materials Encountered Groundwater Laboratory Testing SOILS ENGINEERING ANALYSES AND CONSIDERATIONS Levee Levee Foundation Materials Dewatering Levee Fill Materials Levee Design Slopes Stability Analysis Slope Protection Levee Consolidations - Settlement Channel Channel Excavation Dewatering Channel Design Slopes Gabion Drop Structures Foundation Materials Gabion Fill Bridges LIST OF PLATES (Plates follow text) Vicinity and Location Maps Regional Geologic Map Legend - Regional Geologic Map Core Boring Locations Map Core Boring Logs Hole No. CB-VIM-1 CB-VIM-2 B-i PAGE NO. B-1 B-1 B-1 B-1 B-2 B-2 B-2 B-2 B-2 B-2 B-2 B-2 B-2 B-3 B-3 B-3 B-3 B-3 B-3 B-3 B-3 B-4 B-4 B-4 B-4 TABLE OF CONTENTS (Continued) LIST OF PLATES (Continued) (Plates follow text) B-7/B-8 CB-VIM-3 B-9 CB-VIM-3B B-10/B-11 CB-VIM-4 B-12 CB-VIM-5 B-13 CB-VIM-6 B-14/B-15 CB-VIM-7 B-16 CB-VIM-8 B-17 CB-VIM-9 B-18/B-19 CB-VIM-10 B-20/B-21 CB-VIM-11 B-22/B-23 CB-VIM-12 B-24/B-25 CB-VIM-13 B-26 CB-VIM-14 B-27 CB-VIM-15 B-28 CB-VIM-16 B-29 CB-VIM-17 B-30 CB-VIM-18 B-31 Laboratory Test Results Summary Gradation Curves B-32 CB-VIM-1 B-33 CB-VIM-2 B-34 CB-VIM-3 B-35 CB-VIM-4 B-36 CB-VIM-5 B-37 CB-VIM-6 B-38 CB-VIM-7 B-39 CB-VIM~B B-40 CB-VIM-9 B-41 CB-VIM-10 B-42 CB-VIM-11 B-43 CB-VIM-12 B-44 CB-VIM-13 B-45 CB-VIM-14 B-46 CB-VIM-15 B-47 CB-VIM-16 B-48 CB-VIM-17 B-49 CB-VIM-18 B-50 Plan-Soil Profile B-ii TABLE OF CONTENTS {Continued) LIST OF PLATES {Continued) (Plates follow text) Stability Analyses B-51 Slope Stability - Levee- End of Construction B-52 Slope Stability - Channel - End of Construction B-53 Slope Stability Channel - End of Construction • B-iii A. INTRODUCTION 1. This appendix presents the geotechnical investigations and tests which. were conducted to define the geotechnical conditions at Mon Bijou, St. Croix, U.S. Virgin Islands. B. LOCATION AND PHYSIOGRAPHY 2. The island of St. Croix is the largest of the three u.s. Virgin Islands. The island is 23 miles long from east to west and from 1 to 6 miles wide. The areal extent is given as 80 square miles. The bank on which the island stands is, however, 35 miles long and in places, 20 miles wide. Location and vicinity maps are shown on plate B-1. 3. The hills of St. Croix are composed largely of igneous rock and rise abruptly from the northern shore (highest point is Mt. Eagle, 1,165 ft.). The hills give way to fertile rolling lands, lagoons, and beaches to the south. The mean annual temperature of St. Croix is 74 oF and has an average rainfall of 45.7 inches yearly. C. GEOLOGIC HISTORY 4. The Virgin Islands and their bank continue the geology of Puerto Rico for another 100 miles eastward to the point where the Antillean geanticline is pinched off and the Anegada fault trough goes down to a maximum depth of 7,120 feet. Forty miles to the southeast, the limestone-covered Caribbe.s begin. To the south of the Virgin bank, and between it and St. Croix, is a fault trough 28 miles in width, and about 15,000 feet deep at its maximum. The island of St. Croix, with its bank, is about 35 miles long; it is an isolated part of the Antillean geanticline, both island and bank having the same northeast- southwest trend (about N. 70 oE.). The strike of the rocks on the Virgin bank, however, has two different trends, that of the late Cretaceous being northwest-southeast, while the Younger Series trends about east-west. 5. The basement of the Virgin and St. Croix islands is a very thick mass of essentially volcanic materials like that of Puerto Rico; it has thin fossil zones that are of late Cretaceous (Gosau) time, and younger intrusives, all of which are more or less intensely folded and fault~d. The dioritic intrusives are most common in the eastern islands. The older formations together make up the Mount Eagle series. Epeirogenic elevation in Eocene time amounted in the west to 750 feet, with a further rise of 500 feet in the early Oligocene; toward the east these elevations descend rapidly. 6. Unconformably over the old basement rocks on the southern side lies the Kingshill series of marine sediments having a thickness of at least 600 feet and representing the time from the middle Oligocene into the middle Miocene. Their deposition was followed by renewed epeirogenic elevation combined with block faulting on a tremendous scale. This differential movement began late B-1 in the Miocene and endured through most or all of Pliocene time, bringing on the present geography and the overdeepened submarine topography. See plate B-2 for a regional geologic map. D. INVESTIGATIONS PERFORMED 7. Core Borings. Eighteen (18) core borings (CB-VIM-1 thru CB-VIM-18) were drilled along the proposed bypass alignment plan. The borings were drilled to depths of 20-35 feet. The unconsolidated materials and softer rock were sampled by standard penetration tests (1-3/8-inch I.D. x 2-inch O.D. split spoon wi~h 140-pound hammer falling 30 inches). Rock was sampled using 4- x 5 1/2-inch diamond bits. All materials recovered from core borings (exclusive of samples used for testing) were placed in core boxes, sealed, and stored at the Corps of Engineers• San Juan Area Office. Core boring locations are shown on plate B-4 with core boring drilling logs shown on plates B-5 through B-30. 8. Materials Encountered. Materials encountered consisted of layers of firm to very stiff silts (ML, MH), firm to hard clays (CL, CH), firm to very dense sands (SM, SC) and firm to very dense silty, clayey gravels (GM, GC). All borings terminated before encountering hard rock. Plate B-50 shows soil profile along the proposed levee and channel alignments. 9. Groundwater. Groundwater was encountered in borings immediately upstream, downstream and east of the in-place earthen.dam located approxi- mately midway of the bypass alignment plan. The groundwater was generally 8-12 feet below the ground surface and followed ground surface contours. The groundwater table fluctuates; therefore, groundwater elevations shown on the borings are only indicative of conditions at the time the borings were taken. 10. Laboratory Testing. Laboratory tests (visual classification, moisture content, atterburg limits, and gradation analysis) were performed on repre- sentative samples of overburden materials. Laboratory tests results and gradation curves are shown on plate B-31 through B-49. E. SOILS ENGINEERING ANALYSES AND CONSIDERATIONS 11. Levee. a. Levee Foundation. (1) Materials. The materials along the proposed levee alignment appear suitable for levee foundation materials. The levee will be founded on firm to very dense sands and gravels and very stiff silts. (2) Dewatering. No dewatering of the levee foundation is anticipated. B-2 b. Levee Fill Materials. The levee will be constructed of those materials requ1red to be excavated from the channel. The excavated materials will consist of firm to very stiff silts (ML, MH), firm to hard clays (CL, CH), firm to very dense sands (SM, SC), and firm to very dense silty, clayey gravels (GM, GC). Moisture contents for the excavated · material ranges between 6% to 51%, however, the majority of the silty clayey materials are within, or close to, maximum moisture-compaction limits which are 19% (ML), 17% (CL), 36% (MH), and 25% (CH). These materials should be suitable for levee fill materials. Levee fill materials will be required to be compacted to 95 percent of standard maximum density. c. Levee Design Slopes. (1) Stability Analyses. Slope stability analyses were per- formed for a levee-foundatlon section in conjunction with a channel excava- tion section at boring CB-VIM-2. Slopes at this location were considered to be typical levee slopes. Material shear strengths used were based on · material type and blow counts from standard penetration tests. Slopes were analyzed for end of construction conditions. Flooding conditions are of short duration with steady seepage conditions and slope saturation with rapid drawdown condition unlikely to occur; therefore, stability analyses for these conditions were not performed. Slopes were analyzed for both wedge and circular arc failures (UTEXAS2 Computer Program). Factor of safety obtained was 4.51 (end of construction conditions). Slope stability analyses indicate stable levee slopes of lV to 2.5H. Levee slope stability analyses are shown on plate B-51. (2) Slope Protection. Gabions (12" thick) will provide slope pro- tection in the vicinity of the drop structures. Seeding and natural grass, which takes over quickly, should provide adequate slope protection for all other slopes. d. Levee Consolidation - Settlement. The maximum height of the levee will be approximately 4 feet with levee materials compacted to 95 percent of standard maximum density and constructed on firm to very stiff foundation materials, therefore, little to no consolidation-settlement is expected during and after levee construction. 12. Channel. a. Channel Excavation. Maximum channel excavation depth will be approximately 30 feet. Channel excavation materials will consist of firm to very stiff silts (ML, MH), firm to hard clays (CL, CH), firm to very dense sands (SM, SC), and firm to very dense silty, clayey gravels (GM, GC). Groundwater is generally below channel excavation grade exclusive of the in- place earthen dam area. No rock excavation will be required. Excavation of materials can be made with conventional excavation equipment. B-3 b. Channel Design Slopes. Slope stability analyses were performed for channel excavation sections near borings CB-VIM-6 and CB-VIM-11. Slopes at these locations were considered to be the critical and maximum channel excavation slopes. Material shear strengths used were based on material type and blow counts from standard penetration tests. Slopes were analyzed for end pf construction stability conditions. Flooding conditions are of short duration with steady seepage conditions and slope saturation with rapid drawdown conditions unlikely to occur; therefore, stability ana- lyses for these conditions were not performed. Slopes were analyzed for both wedge and circular arc failures (UTEXAS2 Computer Program). Factors of safety obtained were 2.29 (end of construction) at boring CB-VIM-6 and 1.52 (end of construction) at boring CB-VIM-11. Slope stability analyses indi- cate stable excavation slopes of 1V to 3H. Excavation slope stability ana- lyses are shown on plates B-52 and B-53. 13. Gabion Drop Structures. a. Foundation Materials. Foundation materials for the gabion drop structures along the proposed bypass alignment plan are of sufficient den- sity to provide adequate structure support. The gabions should be underlain by filter fabric to prevent intrusion and piping of fine foundation material from beneath and into the gabion drop structures. b. Gabion Fill. Fill for having a un1t we1ght of 165 pcf inches (Guide Spec. CW-02541). duce concrete aggregate will be materials. 14. Bridges. gabion drop structures should be stone (SSD) well graded between 4 inches and 8 It is anticipated local quarries which pro- able to provide suitable gabion fill The local sponsor is responsible for all permanent bridge crossings. No temporary bridges should be needed during construction. B-4 + e i i ·"l. e + <Qt• •<>to e -+ .... '' VICINITY SCALE IN lllllU I 0 11111 I' MAP I 01 ,, ... '. + ... ., A T I. A N T I C 0 C £ A N ll"&.::· F~"·· ~t '~~·~t. .• ' -- .~. "l -' .., .... r •"' _., It , "'\ c:::2- ~ •' vaac:IM ~~ ... ~'!4 -- . ..,.. \\ I DDn.:,.. "-- \\. T lni"ATin!IJ. ·~ CARtii£AN S E A IUU !II-CI I r .. IC • LOCATION MAP ~ SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX 8 VICINITY AND LOCATION MAPS DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS. OF ENGINEERS JACKSONVILLE, FLORIDA D.O. FILE NO. 109·34,414 PLATE: A·l e e e ~ # .. • -+-+ ...... \J Kw ISLA DE CULEBRA --- ~·1 ----- . ... . ·-·-·-- ,y •• ~ /'\ \., . \ \ , ~ I /"'" /./ t-1 s \, ;..'f. ~ 0 s E f'OR LEGEND SEE PLATE 8-3 . SECTION 20S . OETAIL£0 PROJECT REP<>f'T ESTATE MON BIJOU ST. CROIX, U.S • . VIRGIN ISLANDS APPENDIX 8 . REGIONAL GEOLDGIC MAP DEPARTMENT OF THE ARMY .IACKSONVILL~ DISTRICT, CORPS OF E:NGINEERS JACKSONVILLE, FLORIDA FILE NO. 10.-54,414 PLATE S-2 e e e I ~ l ;§ J ~ Q J EXPLANATION ~ s.m ... tary ..,_ta, IIMivicw Jl•nN liMIIUN, c.Zc•r•ttitt, .. ~. tA.ZI, ••rl, ~~ .. tte, GM clar; GU -'""'i•l, l•u•u.. k.cA, .,",..· .... ,. MClrtA, GM .,..., ~ G Sedimentary and voleanic reeka, _. .... In Puerto Rico; ftlteron•, tattdtt.N, CO"flo_.,..,., .Z,.Z ,.,... eron., lava, ttif/, larg•lv dtpoeittd in a -",.. lttftr.,.t!Mttt, mer include eonu pluronic attd lavdrot~r .,..,...., tWb attd tom• etrata of Crltac•oue Clfl; in Vir,itt .W.U., ...,, quarlz·attduite and a-ugit•·andttitf br•ccia attd ttiff...., Ia~ and mccia Plutonic rocka In Pwerto Rico, Vilq"''· and Cultbra, larg•lv grafiOdionu au q"artz diontt, eo me diorite, quartz porpAvrv, gabbro, •tiC toMt smpAibolitt; in Virgin leland•, predominantlr eo...lit.l, toMt •U.tl tv,ff, ,..,,_tit., la.mproplavr• dibe, attd didul; klwM ro "'" bun tmplaced during Late CretCICIOVI, Pal.e~N, •tiC EocMe Voleanie and Mdimentary roeka, uMiyided Ttiffaclttt~,l M~, tiltltottl, br•ccica, •*' c"floMtrt~tl,lava, ttif/, tOMI li11tutonc a"d flttubro"c; l•r1•lv dcpotitcd it~ G 11tarine lttvirOR*'"t; ,.., ittelucl• ""'' AvdrotA•rJII4llv alttrcd rock• at&d IOMI •tr•t& •I PsilOCIN au (or) Eoceflc ~· GJ • + Serpentinite S.rpentiniz•d peridotite(?); probablytmpla.ced duri"fl tAl Early or early Lat. Creta.c1DU1 Volcanic and S,edimentary rocka, undivided Tuff. tuflaceoue breccia, rome 1a11d1ttme, rilt1tone, at~d li•· rwn.; in Puerto Rico, lava, lava breccia, BOMI amplt.ibolit.l and laydroth.•rmally altere4 rocke; in Virgi1t lela1ttl1, klr4· toplt,yre and spitite flow•, volcanic wac/us, IIU1it4-attdetite breccia, radiolarite, at&d 10?11# CO"'lo'"*rllte; lt~rrelr U~d in a marin. envirOR-Nnt; m«JV i1tcludc -.ome 1tratfJ. of Lat. Creta.ub"' ag 0)- z~ •c >-Z ~~ cw -~ ~c ~::» ~0 )o cr: c ~ 1&.1 ~ IJ) ::» 0 41 u c ~ g; u . ---------- Contact DatltMl w..,., utteerl4in I t I~~"'-'-- ........ , 4 D • ~ fault iavolviac buement movement SolWI it~ ea-ri,.. sr•., kted · 0t1 etiemic datG.. D..IIH wl&trc eztra,ol4ttd; dotutl wl&ere epeculated batH 0t1 to,Jef· rapAr G"tl magNtic gradu"t' ••d tr•ue; querild wwe doubiftd or i'4ferred. 0 or ticltt, iuic•te u-tAro- lfM; U, "PtAro10f& tide; arrow• eAow dir•ctiott of•pJN.rnt ltri.kA- •lip MOWM~ttt,· t11tA 0t1 "PPfr pl4te of tAruet f•tdt ....__...____._ ~ ~-'- ~ ........... ? Minor fault in ledimentary cover Not klit••d ro '"•olv• be~,.,.,"t. Solid '" "'b•ariN a,.. baud n ttitMic data. Dael&ttl wl&tre •ztre~poltJtltl; dottld wAITC •~; f"'Nd wAin doubiftd or i'4/tnwd. ficb itteUccu ~ro- .UU •. , ...,.....,....,....~w-.... Fault lODe ZON •I "",.,""' do10tt-to-batin fe~tdtl Clio,.. iN"lar ,.._,.,- •! Jlwrtoe ~A; fatdt pc~Uonl """rl4i" ......__ . --- Axial trace of fold IJ,tAttl wAcn e~trapolattd; dir•ction of plunge indicllt.fd wlacre · ktt010t&; arrow• denote dip of eedinentG.ry laori~gne away f"* creet .J.. .J.. _t, ..!.. .J.. ...t. ..!. ..!. ..!.. .L MoiiOClinal.flelture 1'4ferr•d t"nd of monocline it~volving tub-bottom Aoriz0t11 of V f"Czutla.n batin along eoJdla margin of MUI1'UI• Trot4gh. +--+ + - + Poeitive magnetic ~Y 7rlt&d of ,.,ftdtlal1JlGIMtic MIOmalV ,,.,.,..,~ + 15{) gamm~~~ SECT~ 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX B LEGEND- REGIONAL GEOLOGIC DEPARTMENT OF THE ARMY JACKSONVILLfj DISTRICT, CORPS OF ENGJ.NEERS JACKSONVILLE, FLORIDA FILE NO. 109• 34,414 PLATE B-3 ~ . e -,~ J e ~~-~ -- .,. 'I ( j / '/( ,-c ~' · • ...-~2- - . /~-r-.· .· / (/ ): / /.-~ :;;.;;/·:<'" - ' --...., I ' ' /?' . ~-('_ ~ _, _....,{.· -~ ~- \~ I t SCALE IN FEET 100 0 100 200 N LEGEND @ CORE BORING LOCATION AND NUMBER CI·VIM-2 NOTE: _PROfiOSED L£YEE J..OCATIQfiAfl) ALIGNMENT _PROPOSED CHANNEL LOCATION AND AUGNMENT I. FOR CORE BORING ORILLI!lG LOGS SEE PLATES S-5 .THRU 8-30. ·· · 2. FOR PLAN-SOIL PROFILE,SEE PLATE B-50. SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST CROIX, U.S. VIRGIN ISLANDS APPENDIX B CORE BORINGS LOCATION MAP DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS. OF ENGINEERS JACKSONVILLE, FLORIDA D.O. FIL£ NO.IOI-54,414 PLATE 8-4 Hole No CB- VIM-1 ~IVISION INSTALLATION ~~HE£~ DriLLING LOG SOUTH ATLANTIC JACKSONVILLE OISTRICT OP' 1 S~EETS 1. ,.ROJI:CT ..... u ~ .. o TY~ o~ .,T srL n JPuor~ sAt:PL<:R _12 ft ESTATE" MON BIJOU ST. CROIX v. I. ... U~' U• ·~ '"u•" < •o•.., .. 1.) , LOCATIOt1 (~....,- ., .,_,._, MSL Y = 1 fo7? 4?R V= 73. I>:'" 12. MANUP'ACTUIIER'I OIESIGNATIOM OF OR ILL L ORILLINQ AORNCY CME 45B (Hollow stem auger-drilling) GEO CIM INC. 11.. TOTAL MO. OF OVER~ 1 DI8TURe&o ! UNOfiTU'IIt8&0 o. :,L:,!'~.:.---··-"""! CB-VIM-1 IIUROO:N IAM .. LI!I TAKI!N, 13 ' •o.ToTAL•u••~t,.cou ... x~ts1- For plastic jars I. NAME OP' DIIUL.L£1111 FLOR RIVERA ... o:Lo:v•Too• ""ou•o wATI!" Not ·encountered L DI .. IECTION OF MOLl! f1TAIIITCD 1 cow.-LaTao IXJvaiiiTICAL QINCLINIEO ... DATE HOLlE h0-24-83 ll0-24-63 D& •• P'IIIOM V&lltT. 7. THICKNESS OF OVI!R.UROE:N Greater than 20 ft. 1?. I!LO:VATION TOP 0~ HOU 175.fi1 ft. 18. TOTAL CCMIIE RE:COVI:fV' FOR IIORING 72%, il. DE~TM OfiiiLLEO INTO ROCK No rock drilled ... SIGNATURI! 0~ INI .. ECT~/ '~ 1-· TOTAL DEPTM OF NOLIE 20ft. Guillermo Abudo ~Qr ~ CLAIIIP'ICATIOII OF MATUUALS ~CORC: •ox OR tDr••- ,,.:•!~:.Kf" ... ...,. of &LIIVATION DIIPTH LEG liND "'-- lti:COV• SAIIPLIE ft, fi DY .... ; l!lo::""'Tr" -'ii II o-t.c.nd . 4 . I 175.61 0- SILT, some clay, some rock lZ r-L- N=N-value = fragments, trace fine sand, 1 5 10 14. W=water 1-= dark yellowish brown. (ML) ~ content 1 5 = 5 in %. ,. 174.11 . - '/ /' 1, ~ 2-= I 140# ham- = [,/~ ROCK FRAGMENTS, subangular 2 ~- 17 11.5 ~er with - ' to subrounded, some fine 8 I 30" drop 3-= f / ,._,' sand, little silt, light V,:. f-1-- Llsed on = olive brown. (GC) * 2 ft. long - 3 8 19 9.7 f.l it SJDOn 4-= ; - 1-3/8' IDx 4.5 = % 11 I 2" OD) -' '~ ~ ~ 5-= = ~ 4 r-12--t 34 9.2 - 6-= ,. 15 ! = ~ % ~ ~.6 \ = 5 f-ll.-; 41 7-= *Unified Soils Classifica- 7.5 = tion symbol and legend % 32 - ~ reflect lab test data % r-E- 8-= results. 6 r-!2-- 37 B.8. = 9 - '/ % lB lli6.61 /j z = 9 - 1- 5.3 w-= Silty CLAY, little fine 7 .ll 28 .- ~ sand, hard, yellowish brown 17 10.5= % mixed olive dark brown ;,:. 14 n-= stains, trace rock = ~ fragments (CL). 8 18 41 1as - % 23 12-= = ;,:. 9 - ~ 9 16 34 13.3 13-= I - 18 I 13.5= % 14 ...:::. t% ;.:: 12 ! i = 10 14 31 16.7 - 17 I - 15 - " 16a.GI ~ z 10 = ROCK FRAGMENTS, some silty 11 17 38 15.8 - clay lumps, little fine 16-= ~ sand, medium, light olive % 21 16.5 = brown (GC). lZ 1? - 7-= 12 16 43 18.3 = ~ 27 - ' 8-:: % 7 v.: 16 = 13 42 83 2.5 - ~9 -: v; 18 - 15:i.!;l ffi : % 65 EHG FORM 18 36 Pii':EVIOUS EDITIONS Ail':£ O.SOLETE. PRO~ECT ESTATE MON BIJOU, I HOLE-NO. - (TRANSLUCENT) ST. CROIX, USVI CB VIM 1 MAR 7f PLATE B-5 Hole No CB- V U1-2 I OIVISIOH DRILLING LOG SOUTH ATLANTIC INSTALLATION ISH£.'[ T JACKSONVILLE o• 1 .~ .... 1 1. ~"OJIECT 10. '""AND TYP£ o• e1T ( 1-3/i'"lDxZ''OD soli t -;oor4 Ir-Es;-;-.. ' A,.T,.;E;ru;f·10,N=B:::I::::J::O::-U-::· :-;S::T::;.::;-C_RO_I_X_:, __ u_sv_I ____ ., 11. DAl u• '""' ~ .. u~' OUft >Hu• .... ~ ..... , . ~~1T:8'~c,Tc\',r-., ·~"'1t:574 f1SL 12. MANUP'ACTU"IIR'S DESIGNATION OP' DRILL CME-458 Hollow stem auqer drilling J,. DRILLING AGCNCY GEO CIM INC. &. MOLE NO. (A• .,_._.- ...... tlfl• -m·-• ! CB-VIM-2 11. ~~~~~NNfA::Lili!TA,\IIti!N l o.•{311t••o ~ UHDI•Tullll•l:o L NAME OP' DltiLLI:" 14 TOTAL IIUIIBEIO COIOE .OXEI) for olastiC iars FLOR RIVERA II. llLitVATIOM GROUND WATitiO nOt enCOUntered a. DIWt:CTIOH OP' MOLE IJ¥•111TICA1.. QtNCL.IN.D ----- o••· P'tiiiO.. Y&IIIIT. ••. DATE HOLE I Yo".:'2~~83 : 1B':"2'n"-·lf~ 7. THICKNESS 0' OVERBURDEN greater t~an 20 ft • 17. ELIEVATION TOP OF HOLlE 17::_3.:._• 9:_:8:::_cfc_:t:..:•.;,.· ::;-;;;--------i . DE .. TH ""ILL ltD INTO ROCK nO roCk dr1ll l ng e. TOTAL DE,.,.M OF MOLlE t:U n;. ~ ~~.:. 8 1 r-L ...__::: . IllY ~ 17 ~-- ,~ ROCK FRAGMENTS, subangular 1 .~ = ~ /,, to l"--4'-'4c.:;;%,.__-+-'""t£~--+--- subrounded, fine sand, z 18 , I ~ / little silt, trace clay, 2 ~ 87 6 _3 = , / compact, friable, varying 1 62 , :r-::/-.!-' from dark brown (samples 1.2~;,:--+---+~-1-2- 1 --+-1--, =("/to light yellowish brown 3 ~ 28 j 4 •2 4-::~ _ and olive brown. , 11 = ~ (GC) * 1'-8- .. >-,-,/ --t---+-10-:----+! -- 5-::•/ 4-' - ~ / ~ 37 i14 ~ /? 1"-/_4_7%+--~17 __ --t-1 -- - =·/· ::!. ~ -/ 5 r-:: ~ ___.2._ 27 - % 18 ; =_! ~ ~----+----~------4---- v.. z 20 j a-:v/ 6 2o 64; 5.1 ~~ 1"--~%*-_~34~-~~-~: =,.,/ l flU i ,,._::t- / 7 ~ 3117.3 1v -v-.,- % ' 13 : ' 1~r'-; F--%--+--8-+-'-11--+-, -,f-, _____, =V' *Unified Soils Classifica- ~ 62 1 6 t' ,.,_::I / tion symbol and legend % i 173.98 10 6.6 = results. r----: I i -~~ g~33! 1 .. -l/:;~ reflect lab test data 1'-%--'-'--~--+-1-5 __ _,11----i 1~~ ' ,-- '' I 9.4 I lG0.48 3.5 • % 16 i I 1~/ox• SAND, weathered rock frag- z rli--1 1 = • ments, some clay, littl~ 10 I"' : -".~silt, compact, friable, ~36 i 13.3 1s-:: ,/o" yellowish brown. (SC) i,:S" %,;, 20 =_"'%"' kJ i I _.A'o 0 _ 11 17 1 ~12 J 1~ 0 h i--- 138 ,. ' -~ 21 i 1~~ /,:,3" % 12 ~ 'I !I :/o () ~~8 13.7 1&-::_-~ 24 i ! o / AUGEIRED ~" : ,/•. 1./" _13 ! 19""':: p _;....- =/'. 13 "" 1 153.92 - 0 / ~53 '12 2o - v- · ' 94"' ?R EMMCA!~~M 18 J6 PRIEVIOUS EDITIONS AIOIE OIISOLETE. (TRANSLUCIUiT.) PLATE B-6 PIIIOJECT ESTATE MON BIJOU ST. CROIX, U. S. V. I. I HOI..E NO. CB-VIM-2 HeleNe CB-VIM ~ IMUT 1 DRILLING LOG l"'voaSoUTH ATLANTIC IIOIITALLATIOjACKSONV ILLE OF 2 SHEETS I. -OJEC:T .-<;TAT. r.ifiN R 1.1011 ST ronTY <; V T L DIIIILLINO AO.NCY GFO CIM. INC .. NOLl: MO. (Aa .,__- ........ Hll• oo. son MD Tv .. c>P ••T 4x5! core oarre IZ. -IOUP'Ac:1 Ultll,..l DIISIOIOATIOOI OP' DltiLL CME 458 ' ••. ~3~~kNN:A:tLil~AKIUI ~DiaT'i2aao ! UNOtiTu.-aao -•·- ! CB-VIM-3 L MAliC. OP' DIULL&IIt 1=1011 IITVI=IIA IL TOTAL IIUIIURCOIIE liOXEI 1-fOr plaStiC .iarS&C ... ELEVATION OROUIID WATER NONE •• OIRRCTION 011' MOLl: 11TA .. TIEO (C~L.TIED 'XlYIUITICAL QINCLINIED ---- D& •• P'ROM YIEJIT. ... DATE MOLE I 10-21-83 ID-28 -83 17. ELEVATION TO .. OP' MOLE 172, 72 ft. 7. TMICKIIIISI OF OYIIR8URDt:N8ed roCk not reached, II .. TOTAL COlliE Rt:C:DYI!RY FOil 80RIIIG /) 62 1-· DIIOOTM OltiLLt:D INTO ROCK • U- ••· SIGNATURE o.- INI"Er . yy /7.L. _L .v'. Guillermo Abudo "'~./~41"~ ' je. TOTAL DIEOOTM OF MOLE 1 ft a:LCVATION ft •• 172.72 71.22 62.22 -~ 51lty clay,trace nne sana, V,:, _ 6 g> =v; hard, little white silty 1 ,!2 1_: concretions, dark brown. (CL) .JL_ 23 20 - / . - % 15 ;:: .5 /;:? [{. 2-: • Silty fine sand, little lQ.._ 10 N )( 0 0 N -%: clay, mixed weathered 2 ~ 33 =v ;/ rock fragments, 1 i ght 72 " 18 ~V/ yellowish brown.(SC)* 1'~......;~+---+.;. 12 ;;.._-+---+---;:,: =~ 3 ~ 41 9 §:-- 4-=v-/ ~ .· : g~ ~i~ ~4::", ....... ;'r---+'1""0--+----: ---;!' i~ 5 = ,/' / 4 tlL- 26 11 I~~ = / lea·~ ' : -;;; ~ o-:_r:-: [Zo 5" ~; ; :o :~ 5 rlL- 38 11 ~~~ -r-: /-:./ l :;;::: ..c:: • ,._:=_t{ 12'/'/ ~~ ~~:11 0 - ' 1----20 1.. 38 7 I I : ~- C// / 0 I =;- • '', - . / ~ I 6]~; ~ i z ~ §! ,Jt::2 '/ , :; " ,I 1 i! ~~:~ : / Q- L/ 78"' I <n ~;::!; o.5 v 17 5.. I u--= /F>ilty clay, trace fine sand, . ~ ' :v/ ~ard1 yellowish brown,dark 8 ~ 95 17 l i - ./ I:JrOWn SpOtS, ;rac,e rOCk 64' i on I 1 .. =V" :;,:: rW- =r Y ine sand, weathered rock 9 13-:1-{' /!fragments, hard clayey ~ 1---- -/ y ilt lumps, yellowish "' - · lfr;onmPnt~ \ CLJ ·' " ' L..l.:L 14-::r / SC)* 1o ~ =r:/.fkunified Soils C~assification ~ 102/ Boulder 6" I 13 · 1 ' I 102 ' 10 I ! =v . ..,Prown mixed white. z 22 ~-=V . ..,. symbol and legend reflect 7_%_ 15 =V lab test data results. "'2'~L.Iil...+---+_-2"'7:--+---+-l---l =k 11 39 84 9 w:r. ~ % 45 i '--=~ ""r;,;:-=-:..:::.,+---t-2.:.;8::.......t---t--i~~~~t 1t :~ 12 34 76 12 Drilli 54.72\ .18 :/. % --:rr- ~3-27 154.68-r~~~r.==:======"f::nmQ:&~~~~:t:=c.:...; :~.PSub angular to subrounded 12/' 1) Used 1g_:~# rock frag'!l'!nts i~ a silty 4x5t Core Barrel - • clay matr1x vary1ng to 13 2) Drilling time :r; ./" layey silty sand,(GC) 3pm-6pm. 152.72 20 -V• PROJCCT I MOLE NO". Mon-Bi jou ,St. CrolX,U. S. V.I. CB.VI~,-3 EMM~!~~M 18 36 PRI!:YIOUS IEDITIOOII AlliE O .... LETI£. (TltAifSLUCSifT) PLATE B-7 DRILLING LOG (Cont Sheetll'"v•rooN ro• Of""" 172.72 Hole No. CB-VIM-3 I'IIOJfCT !INSTAlLATION I''"" t. Estate Mon Bi ·ou St. Croix U.S.V.I. Jacksonville Of 2 SHUTS ClA$SifiCATION Of MATtRIAlS %COlE lOX 01 lfM.UKS ELEVATION DEPTH LEGEND (~-) IECOV· SAMPLE ( o,..ll,., ,.... ...,r ,,.,. Jrpcb llj flY NO. .,.u"""l· •lc .. •f "6"'/tct~•tJ . b c d . f 8 152.72 20 -~ Core run from 18-21 ft. /33% = (GC) 13 21 - . = ~ No recovery /:: 10-28-83 - 14 9:20 am to 1 pm. 22 -= ~ Rock fragments in silty clay % 15 t&16.,Split- spoon sample - .,;/. matrix, coarse sand (GC) 14g.]2 23 --- This borehole stopped - at 23 ft. d pth. _:::. Boring 38 drilled next to bor ng CB VIM-3 - was completed to required 30 t. de th. -= - = = -= = -= = I = - - ' - I -- -= I - =1 ---! ~ -< --1 j j -< ' --1 i --J ! -i - I - I - I - i - : I =1 i ; ' ' --1 ---! -; --1 ! ::J ---i i --1 I - I -< ! -- -' I I I -; I I -= = = -= -= --= -= --- -= = = I -= I : -= = - lNG»< ~ 1136-A 011'0 IMt Of'-Ut·l•l I'IIOJICT !_""" NO Estate Mon Bijou, st. Cro1x, u.s.v.r. CB-VIM-3 PLATE B-8 • • fR-VTM-3.R ........ DRILLING LOG 'DIVISION SOUTH ATI ANTTf IMou•LLAnOII JACKSONVILLE I'"UT 1 OP' 1 SHII~TI I . ..,OJECT IO.IIUAMDTY"EowoiT4X5i Core Barrel{see rema ESTATE MON BIJOU. ST. CROIX U.S.V.I , UAT- ·- •••• ·---.. ·~-- L"'"A !~ (~-.. -~-- MSL X= 1 072,798 Y= 73 794 2. MAMUPACc'M'Eit'4ssU10MA1 1- "" -ILL 1- DRILLING ACII:NCV r.l"n fTM TNf tl. TOTAL MO. o~ oveR- 1 DIITUR•ao i UNDtiTU ... &D &. ~LC NO. (Ae ...... _. ...... Htl• •uRDEM IAIIPLIII TAKEN , 1 -•·-"" i CB-Vll-1-38 toL TOTAL MUHD CORE _,XI:I 1 L NAME OP' GRILLO FLOR RIVERA IL ltLttYATIOII OltDUMD WATER nOt enCOUntered, a. DIIIII:CTIOM OP' MOLl: ~ITAAT&D tc~L.&Tao 0YfRTICA.._ QINCLIN&D te. DATit MDLI: lll-03-83 : 11-08-83 D& •• r'WOM Y& .. T. 7. TMICICMI!SI DP DVt:ltOUitDt:N breater tnan . JU_ tt, 17. I:LI:VATION T~ OP' HOLE 172.72 ft. 18. TOTAL COitl: RI:COVI:RY POIII _,RING /') .. . ot:I'TM DRILLED INTD otococ Bedrock not reached ... IIGNATUIIIE OP' IMiftE~~ .. L.~~ :_) I. TOTAL Dt:I'TM DP MOLE 30 ft. GUILLERMO ABUDO /..._./<. CLAIIIP'ICATION OP' IIATIDUALI -.cORa ODX- fDrlll,.. ,::..~ ... ...,,. ol I:LI:YATION OIIPTH LI:GENO ~- It I: COY· - DIY MD. ....-...... ··~· " •• ,.,Unc) ft .• ~ c 4 . I 172.72 0 : Augered to 18 feet; then : set casing to 18 feet and ~ rotated it to advance to 19 feet. ~ f- = - 154.72 lll - : KocK tragments, SlltY Clay ~ sample from cas1ng - matrix. shoe. (ZW). 153.72 10 - : ~ ~ - ·.// 1 2~ Subangular to subrounded 1 Water pressure = ~/~/ rock fragments, in a ~4" I in drilling (psi) 28 .-~/,r greenish brown silty clay ' 21--= matrix; matrix makes up I 1 = ~ .. /,. approximately 10% to 30% / - / .. · by volume; clay has high /100 22--= . . dry strength, plastic, = sticky when wet, trace % Water press. 10-15 psi - ... / silt; rock fragments up to 1 2~ 1./· 8 em diameter include . - andesite, tuff, siliceous 1" - • tuff, chert, quartz-horn- I Water press. 10-35 psi - 24--= _/ • blende, phanerite, basalt, I 1 -vc moderately strong to very /4~~ - strong rock fragments. - ..• N-Blows 25-= ,·//:_. Soil matrix varies to = ~:-~· sandy gravelly silt. ~: w 140# harrrner, 30" - (GC) 1 drop on 2 ft. long 26-= 1-3/8"IOx2"00 spli = • 811 / spoon sampler. . . / = . 1 Water press. 8 psi ./ 67 27-:: , .. I %' = // • 1 Water pres~ 15-30 psi 28--= 8 = /' ~ -» 29--= 1 Water press. 15 psi = ~~ - 142.72 30 -= : -:: -= -= : --= : I = -= = - ENG FORM 18 36 PREVIOUS I!DITIONS A .. l: 08SOLI:TE. PRoJEcT Estate Mon Bijou I HOLE NO. MAR 7! St. Cro1x, U. S. V. I. CB-VIM-3B PLATE B-9 s nt~ ,~ tit'' 't --- Helo "-·CB-VIM-4 lliiiVISIOit INS ALLATION SMI:I:T 1 D .. LLING LOG SOUTH ATLANTIC JACKSONVILLE OP' ? SHI:t:TS I. NOJCCT 10. s1u ""o TVN o~ on 1-3/S"!Dx2"0D Sol it sooon ESTATE MON BIJOU, ST. CROIX, V.I. I. DATI ... ~- OR ..... R ·------ xoc;"T1':'MT.!~ .. r~.697 MSL II.. IIAMUP'ACTUIIEWI o•IIONA llliJIIIIIII Of' OIIIIILL S.IHIU .. I.IMe AeiENCY CME 458 ( ho 11 ow stern auoer drill i no l G!=O CIM INC. ''- :S~~ .. ·fA:.r ... ~~·.rA ...... 1 Dl'20"••o ! UNOIITU•eCO C. NOLa NO. (A• .,_ ... - ....... tHie -•·- i CB-VI~l-14 14. TOTAL MUIIOI!IO COIOI! IIOXI!I} fnr nlastiC iarS a. NAME OP' DRILLDII _fLOR RIVERA IL I!LI!VATI- OIOOUIID WATCIO not enCOUntered. a. Dtlti:CTION OP' MOLE 1&. DATI: MOLE teTA"T.O IC~LcTao r;:J•••TICAL OINCLIN.D o••· ""OM v••T. i10-19-83 i10-19-83 approximately 29 ft. 17. ELEVATION TOP' OP' HOLE 167.61 ft. 7. THICKNESS OP' OYEIIt8UIIt0EN 18. TOTAL CORlE lltiiCOVEIJitY P'OR .oi'IING 67.3 /7 .. ~· DEPTH DRILLED INTO ROCK no rock dri 11 i ll!l ... SIGIIATUIOI! 0~ 1111~1!~ a~ at:~ f-. TOTAL DEPTH OF MOLE 29 ft. UILLERMO ABUDO • CLAIIIP'ICATION 011' IIIATDIALS '-CORE aox o.. (DriiUnt~ ,..:.•=::.K~ . .,,. ol CLI:VATION DEPTH LEGEND (D .. -- ltECOV• SAIIIIPtLE I!IOY NO. ~lo~-11, .. ,.. ... ....,,._,., . ~ . 4 . I 67.61 0 : . 0 Fine sand, little silt, rock z __£.__ . - fragments, roots, dark 1 ..1L 1-= 0 0 brown. (SM) 43 18.4 66.1 : . -.·- ... 25 .5 ~ z 2-= 14 - = 2 .1L 66 7.1 -y. Rock fragments, fine sand, • - 42 3--:: little silt, compact, but % :. ~ friable, brown. 1~/ ~ - (GC) 3 ....!.§__ 31 8.1 4--= = v In% 13 - 11 11 /" .l.L 5--= v~ / = 4 ~ 34 5.31 - /. 51 ~s 21 6--:: 14" .· E_ i = ,'. I 4.2, - • 5 -~ 96 7--= / = • 787; 53 - --· 16" 2_9_ I 8--:: • 6 :3_3__j - 69 8 58.61 9 =· • ag;' 36 i _/ - - Clay, some silt, some fine 14" 24 i - / '36 -- sand,hard, olive brown, 7 63 13 i 10 - // i )--= dark brown spots, pockets 78;s ~ i = v// of white, weathered rock - fragments. 11" 20 ! 11--:: .• / (CL) / r-291 / 8 65 15 = / I 12-= 61's 36 i I ' -t---: = 14" lL j - ~ I 13-= / 9 rR. 46 16.3 54.11 = / _lBW 24_ fL3.5- ~ V,:. 24 14-= Rock fragments, subangular, 10 rye . - mixed clay,some silt, trace : ~ r-- 38 19 15-= fine sand, very stiff, 20 olive brown and olive. % - ~ ~ : (GC) * - ~ 11 ,..£§._ 16-::. *Unified Soils Classifica- 53 20 = tion symbol and legend )% 28 17-= reflect lab test data ~ r-N- v results. : 12 ~ 28 12.2 - ~ 18-= 1005 15 = ::,~ 15 - 13 23 50 19.2 19-= /. - = z % 27 48.61 20 = 14 ENG f~~M 1836 P"O.IECT ESTATE f-10N BIJOU l HOLE. NO. PlltEVIOUS EDITIONS AlltE Oe&OLI:TE. MAR (TRAifSLUCIUI'T.) ST. CROIX,U.S.V.I. CB-VIM-4 PLATE B-10 r- DRIWNG LOG (Cont Sheet)i ..... """' '"' "' """ 167.61 Ft. Hole No.CB-VIM-4 I'OOJfCT ! INSTAUATK>N I SHUT fSTA1 r.«''N BlJOll ST CROIX v. I. I Of 2 SHftr\ 2 1 • CLAS51f1CATION Of MA TfRIALS 'lC. COR£ lOX 01 IEMARKS I IUYATION Dfi'TH LIGIND (thJC'rifii-J R£COV- $AMPLE (Dnu,., ,,,.~. w,,, '·"'· ,;,p111 ,, ElY NO. .... ,.,,.,.,, '''·· fi ,,~,,fi, ... !, • b c d n.•% f Rlnw~/4 11 N v• lu<> -~ I% ~ w - Same - From 13.5 ft. 34 12 : 21-= v. to 22.5 ft. 1% 14 16 - tt 1L -v. 22....: 15 ~ 52 15.8 145.11 : y. ;R'l': ":II; 23 _: [:; L 16 : Silty clay,- some fine sand, 16 17 37 16.3 24-= ?n [:; weathered rock fragments, 94% : light olive brown, t! 26 - 25 _: (CL) __ 17 32 62 - ::; [:; - · .. -- 30 - 0% 26 _: ti. 22 : v 18 29 70 22 : 41 140.61 27 -/ 44% =V.I Rock fragments, some fZ 26 silty clay, little fine 28-=~· sand, medium olive brown, 19 48 120 7.5 ~ - . -..,, ' =/ (GC) a i 138.61 ~~ ?n 1nR/1';" inRI"" 29 - j : i I I i ---1 J I I i I I ~ I I I : I I ' I ! i ' i I ::j ' ~ ~ j : I I ' 1 I i I -i -< -j ' -' i -' i -= I - I -: -= : _: : : I -= : I -= --- -= I - I -: - ---- EN~~ 1836-A G..O. INI 0"-UI·U:I oooJKT ESTATE MONBIJOU I""" '"" I ,.V ' ST. CROIX, U. S. V. I. CB J ... ~ PLATE B-11 Helo He CB-VIM-5 HILLING LOG .~VIMON SOUTH ATLANTIC ~-··-~· ,_ JACKSONVILLE •-••T 1 CW 1 SMUTI . .....,.,.,.T •. liZ& MD TY ... OP .IT see remarks ESTATE ~lN BIJOU, ST. CROIX, V.I. .DAT_P"_ ,_R ·---- x~-;"T;;,'",-;:-~ -;j-:af.6 MSI ra. -MUPM;" U,._ .. fl"l DIUrOMA' 1011 DP" DRILL DfiiiiLL .. O AO&IICY OlE 45-B GEO CIM INC. 11. TOTAL 110. OP OVEflll• 1 EMeTu..•ao 1 UNOtaTu•••o ._ MOL!_ NO. (A• _,._ ......... rttl•! HRDII:II IAIIPLI:S TAKII:N • 12 -•·- ! CR-VIM-5 a. IIAMI:OP DRILLER , .. TOTAL •u••• cOIIE 110n•1 for olastic jar sto i FLOR RIVERA IL &LI!VATION GROUND WATII:R NOT ENCOUNTERED. L DI .. II:CTIOM OP NOLIE !•TARTI:O IC~L&TCD tr;Jw&IIIITICAL QINCLIN&D ta. DATI: MOLE i 10-19-83 : 10-20-83 D&e. P'lltOM V&RT. . 17. ELEVATION TO .. OP MOLE 160. 3Q ft . 7. TMIC:KNI:SS OF OVI:IIt.URDCN GREATER THAN 20 ft. 1. HPTH DRILLED INTO ROCK -0- II. TOTAL COlli II: RI:COVII:PtY FOIII aoftiNG 65 _, .. 11. SIGNATUfllll: OF IMIPII:~~ £..£.. I. TOTAL OE"H OP' MOLE 20 ft. GUILLERMO ABUDO II:LII:VATION OI:PTH LII:G END CLASSIFICATION OP' MATERIALS '4COIIIII: •ox 0111 (Drfll., ,,_~a:.,JIIitf:. ... ._,. ot ~- III!COV· IAIIPLIIE I!IIY NO. Bl o~lf"",' ".,....,. .. ..., . ~ c 4 . I !DU,.)IJ = I ! Fine sandy silt, trace clay, ;,:. J1.._ 00"> ·~ r::: = rock fragments, trace +-'0'- roots, dark brown. (ML) 1 ..!L .. ~ cu 34 30.( ... ·~ 1--::. ........ Q. "" 8% 20 cu '+- E = O:::N"' [Z cu "' r::: - ...!£._ a.r::: or:: 2--:::. "0 • 0 .... 2 ..lL t..a.o r::: = 26 13.4 .,oa. cu "OI..V! .... - 14 r:::-o r::: 157.30 3 - % ta= +.1 0 I :f. +.JO ·r- u ~ Silty clay, little fine ..§.__ "'""~ = •Q. ... sand, rock fragments, Et..V> cu - rlL ocu +-' 4--:::. ~hard, dark brown,white silty 3 29 20 .tE8 "' 3: concret1ons. 14 10= = CU .r::: N ';;; (CL) rz :::>""X - ~ 10 ~oc ... ..,,.._ :::> 5--::. 15 > ........ = +-' 4 I •• CO "' = 34 11.3 :z +-' ...... z: - VIM - 19 I CU I I % :z +-'- :;: 154.30 6 -v [% .E._ = Clay, some silt, trace fine -~ ''''· "'''· , .. ···'"'''' 5 ...!.§.._ 44 19 7--:::. rock fragments, olive = brown to yellowish brown, % 28 - ~ black and white silty [:{, 2._ a-::. concretions. - (CH) * 6 .lL 36 17 -- ~ % 25 g- ~ - ..lL --- 7 .1L 43 19 10--::. = % 27 - ~ V,; ..lL 11--::. - 8 ..lL 41 - 12 - % 27 '-= ~ ..lL = /; 13--= 9 .1L 44 15 - 18 146.E::.J 13 r- 1 14....: Silt, trace fine sand, [:(, 12 : compact,friable,trace clay, 10 "16 - white and pale yellow. ~ 40 2,'i.3 14;j.3() 15 - (ML) % 24 : 1 Clayey s1 lt, trace flne v.:: ...!!.. - sand, hard,olive yellow to 16-= light yellowish brown. 11 .lQ_ 48 18.4 : Otl) * 28 = *Unified Soils Classificatio ~ 15 17-: symbol and legend reflectla 12 l2r : test data results. 1-- 47 21.1 18 - ---· % 26 - AUGER - v.:, ~ 19-= Fine sand,little silt ,brown, = at 20 ft. 13 .12_ 33 32 140.30 20 : % 18 ENMGA!~~M 18 36 ~IIIIOJI:CT I HOLE NO. Pfti:VIOUS I:OITIONI ARE OeiOLETI!. . . (TIIANI£UCU., Estate Mon BlJOU,St.Crolx . U.S. V.I. CB-VIM-5 PLATE B-12 Hele Me. CB-VIM-6 SOUTH ATLANTIC ......... TION JACKSONVILLE SHUT 1 RLRVATION DI!PTH ft. • ft.~ 166.67 CB-VIM-6 than 20 ft. CLASIIP'ICATION 0" MATERIALS (D-- 4 Silty clay, trace fine sand, hard, yellowish brown, 1 some white silty concretions (tl) . . s~~~r-------------------~~~~--;-~;-~ 146.67 2 3 4 .5 5 6 7 .5 8 9 10 14 15 16 17 18 20 EM,.G4!~~M 18 3 6 Silty fine sand, some clay, hard, mixed weathered rock fragments, light yellowish brown. (SC) * Silt, little fine sand, trace clay, hard, pale yellow, white silt pockets. (ML) Fine sand, little silt, some clay, p~le brown. (SCJ clay, little fine hard, light yellowish to pale yellow. (CH) * *Unified Soils Classificatio symbol and legend reflect lab test data results P"£VIOUS EDITIONS Afl:l!. 0-.GLE:TE. (TRANSLUC£11'1'.) PLATE B-13 Mon 25 l30.8 J 31.6. 125 20.3! 30.7 28.1 Bijou,St.Croix HOLE NO. CB-VHi-' CB-VIM -7 l l"'vo .. - IIOouoLLdiOHO ~SMUT j DRILLING LOG SOUTH ATLANTIC JACKSONVJ I.LE o• z SHUTS •· ..,._OJ'!CT oo. '""AND TY"" o• ••• 1-3 G" !Dx2"0D 2ft. SQl its_£ ESTATE MON BIJOU, ST. CROIX, V.I. I"·"A'- . ..,.,._ .. ,..A,..,,."".,." ......... , k-.~~Mn~~==~"-==r--~~--------_, MSL --- ·x L7'"t.,.._.._r~"u: ~"!'-!-- .lli:'LA!>II T• /.i. '!f.:IL I. -IOUPM;;TU"E""I DIUIGIOA'IOII OP ""ILL .. D"ILLIIOG AG.IOCY CME 458 GEO CJM, INC. II. TOTAL IOO. OP OVE"· (DOOTu,.auo .. ::.L:.!'!.!:;.,---- """! CB-VIM-7 .... 00:10 "''"'LEI TAKEN! 20 1 UNOI:TU ... I:O S. NAME OP DRIL.LIR ; t&. TOTAL NUMaU COftl: ltOX~I - Q- FLOR RIVERA tL CLI:VATION GROUND WATI:R 00ne •• DU,I:CTtON OP' MOL.R t•TAIIIITIEO 1 co.-LIIT•o atJv&IIITtCAL QlttCLIN&D ----- D& •• PIIIOM V.IIT. ... DATI: MOLl: _l 1Q-2Q-8J : _ _1Q-2Q-8J 7. THICKNESS OP OVEII.UIIDEN bKtA I tK I MAI'I .lU Tl, • 17, IILEVATIOII YO .. OP HOLE t o; 7 Sl.t ft_ ~- DI:PTH DRILLED INTO ROCfC none 1-· TOTAL DIIO'TM OP MOLE .lU n;. ta. TOTAL CORI: RI:COVE"Y 'Ofll BORING 8~ ... IIGNATUIIE OP INII'ECT.JI"l..# ./7/ / ~ GUILLERMO ABUDO ~-~~~~~ 1157.81 =_ Silt, some clay, trace fine u·- j sand, very stiff, weathered ,~ _L_ .!.L_ 28 15 154.81 150.31 l4&.o1 1-= rock .fragments, dark brown. / 1 = (ML) V' 67% - 26.1 2 -= IZ = - 2 1§__ 27 12.5 .,_ - 6,% 12 t: = Silt, little clay, little 1 .. / g : , 2 ,__ = fine sand, compact, friable ~ j' j <= cnw 4--:: white and pale yellow v~· 3 111l52 27 32.3 -~go_ - 6'"~ ~~-~ - (MH) * 1'----"-'"-'",l."t---t....._ _ _.__--1~---: !; ..; "' ~- 6" 8 ! ! ~ 4- g ... - ~----- I Q) (".J c = 4 11 24 23. 4. Cl."' :;:;- - ----- I -o o I f, g ~/ ____JJ,.1_ ' '-- ---' :=-~~-:l. ~,-f-IlL-· h=1t-1'1nn'Pe-s~a;;;niii1a:r,-Tr tlr:;iarce'P. -:s<'liJnt'-:,~--i-:-•.::8 :.::9:..:~;+-- 5 ~-- .~!. J ~:,I ~-= !,_-~=~ ~- ,:compact,butfnable, I ~.-: : .: - 1 - vlhite to li-,ht gray. I 6 13 : 24 .16.6 ro-::~ Q---+~·--~··T4--------~·~s~rnL_ __ -i __ 2s_~" ~1---, J~~ '-/ . ~ : Clayey silt, trace fine 5.5"/ 1 _g __ 1,,__=/:sand, compact, friable, ,// 7 19. 47 36.3 'u - very pale brown, to • =v:brownish yellow (samples V 86%.. ?A l - 10,11,12,13,14,15) to light 5.5"~ lZ _j ' 11-::~yellowish brown (samples 16, 1 : 17, lS, 19,20) / 8 16 36 29.7 1 ,___-/: ( CH )* jo:-'·_'-"' 81G,;...· • ..,._/_--+'?..,.>in'--7--~- '~ - ~8"1 /00.. J.O___i i 1~v: l;;oo, 9 7! 1" i "·' 14-:" / ~3.~ 10 ! I 'I =~ ~.~,,. 10 r, i ,, i :;1~ 17':1 11 ::- j 30 I 36 .I "=~ *IAlified Soils Classific- 94% 17 I i J -- ation symbol and legend 8 ,, ,l!i___ !_ 1 17-=-V: li.__ 41 - ·· reflect lab test data results 12 32 ·9 1 18 -~ / /100% 22 1~}'/ ].~/ 13 ~~ 30 :// /97% 17 20 : / 14 12 I 44.3 c: c u '- "' +-' "' 3: EMMC:..!~~M 18 J6 "OOEVIOUS EDITIOIIS AilE OMOLETO:- (T7fANSLUCIUf'T) P"OJECT ESTATE MON BIJOU ST. CROIX, U. S. V. I. I NOLIE NO. tB-VIM-7 PLATE B-14 i r I I ! DRILLING LOG (Cont Sheetl!"rv.rooN ' 0 ' Of""" 157 .Bl Hole No. CB-VIM-7 ..OJI!CT !"'"'<: FSTATE MON BIJ )U ST CROIX V. I I'"'STALLAJION JACKSON¥ ILLE i Of 2 5Hffl!o BEVATION 127.81 Dfi'I"H LfGI!ND ClAS$1fiCATION Of MATUIALS b d 'lC. COllE aox o• IECOV- $AMPLE ElY NO. • r 8" IEMAIKS (0riiiMI IIJflt, a-.k., l.,u, •tplb ~Jf ,.., .. r-;_,, tic., •f U,~t•fic•"' J LOWS N K w 15 =v -=~ 21 =v: ·clayey silt, trace fine sand, compact, friable, light yellowish brown. 14 19 34 ::1~ 24~t% (CH) * 25 -::r / =t% *Unifi~ Soils Classifica- - tion Symbol and Legend 26 -=v. Reflect Lab Test Data = Results -- 27--= / an / / V:Ooz 16 14 ~ 48 r---- 25 ~ _g_ 27 15 JQ__ 7.s:· / v/ 97% 17 _lQ__ 23 13 ~6·7 18 lh'2% 8"/ I v 100% _u_ 16 1--- 18 34 29 1 1 ' I , 29 28 fa= I !16" ; /1 ' 30. j ~~------------------~ 1 -·~sg~zy/--~~~~------- j 1 1 ~~~ i -:::j I I --1 i I --' I _j I -I --1 I I _J ; --1 - i --1 j I I _:j l I § I I I ! j I ; ....; --1 ..... --' I --1 -I - -= ----------- ----- - --: --= = = --= = - : -- etc;._~ 1836-A PIOJICI ESTATE MON BIJOU I""" NO ST. CROIX, U. S. V. I. CB-VIM-7 PLATE B-15 ,......_. - DIVIIION ONirALLAJACKSONV ILLE rMEET 1 DRILLING LOC SOUTH ATLANTIC 0,. ~ SHII:ETt HeleNe CB VIM-8 I. ""OJilCT to. Sill! MO TYfll: OP 81T <;~~ R~MJIRJ(<; I'<;TATF" KIN RT.JOII <;T r.ROIX V. I . v••- """ ••• __ ,, .... -... ~~- x~"1':073 630 1 .. :74 309 MSL U:. IIAMU~ACTUwtlll"l OESIONA !~.or DIUL.L I. DJIILLING AGIENCY CME 458 (HOLLOW STEM AUGER DRILLING) r..r;n rTM TNr tJ. TOTAL NO. ott ovtlll· 1 OIITu"••o ~ UNDtiTU,..&D .. MOLE NO. ~- .... _.. ........ lttl• .UfiiiDtN SAMPLES TAitCN: _13_ ~ ... _.... CB-VIM-8 1. NAME OP' DIULLDI o•. TOTAL NUMallR CORil IICIUI1 plaStiC _j_arS StOr'!.S FLOR RIVERA II. llLilYATION OROUNO WAT ... nO grOUndwater e. OIRI!CTtON Olt MOL& JITAIIT•o lco.-t..•Tao bv ... TICAL QINCLIN•O M. OATIE MOLE il0-24-83 : 10-25-83_ o••· II'IIIIOM vafiT. greater than 20 ft. 1'7. ELEVATION TOP OF MOLl! 144.00 ft. 7. THICKNESS OP' OYI!R8UROI:N 18. TOTAL COIItl: IIIIECOVII.flll'f" ,Oft .oRING ...,86 .. ~- DI:II'TH OfULLII:O INTO IIIOCK. none II'. IIGNATURI: OP' INSf'CCTW t7' k ~ .£... Je. TOTAL DEPTH OP" HOLC 20 ft. IGUILL'Rf.IO AIUOO • ...,. -· CLASSIII'ICATION OF IIATUIJIAU 'SCORE aox a.. (Drill,.. ,..:.•::,":.:. • .,II of aLEVATION DEPTH LEGEND --- RECOV• IAIIP\.1! ERY ..... BLO~ .... i.:l ...... , ... .c) .f+ • In ~ c 4 . ' 144.00 = Silt, some clay, 11ttle fine 1% 4 = sand, hard, trace roots, t--- dark grayish brown. 1 6 14 20.6 1-:: . (MI.) 50% ~ .5 -- Fine sand, some silt, ~~ 7 ~ trace clay, rock fragments, 2 lo 18 5.9 • - pale brown. (SM) - - 8 3 - % ~ ~ 6 = - L 3 6 13 29.3 Silty clay, little fine ~ - 7 ..... 4.5 : sand, hard, light % "' ~ Q) - yellowish brown, 2 5 ..... 5-:: to brownish yellow to ~ r:: C">S... 4 17 43.3 0 r:: Cl) : yellowish brown. I ·.- o.--c<:: ~- ..... ~ 0.. - (CH) * "' ES:: 10 ... • l'tl·r- 6-:: ' .......... "' ~ 7"1 OJ'<- ..... : r1l- r:: r::r:: QJNOQJ - 0.. 0+-' 5 r-11- 28 30.4 r:: o..r:: 7-:: -o 0 1/) 0 1/94% ... u I 17.5 = 15 "'0..+-' ""'O·r-Q) - C1...--!".- 8----: v:l 8" / _.lL ro "0 c..~ I ..j,) = .,....., / <nO "' I - I 6 14 33 22.7 M C·.- - ~ /~00: g .. f' ~ - 19 g- '-'-N t-JL ~ Q) X.-- - 8" EOro - WE-~ - / 7 ~ 36 28.0 ~ tt) = ;::, - .--.c. CO+-' 10-.: 1//100 tO""=-..tC 20 >OMC ~ I '<t I I 10.5 = z:.-.-3 - 8" / 14_ 11-.: 8 _ _30 55 32.4 I : : i - ~ 100, 25 ! 12-.: 8" 14 : - - / 9 17 37 35.2 13-.: - - 100% 20 3.5: ~ 8" I _lL - 14----: / 10 _1§_ 36 31.6 :. / I 15-= V: *Unified Soils Classificatio ~/ 100 20 ~ symbol and legend reflect 8"// ..E._ - lab test data results = 16 - ~ 11 18 38 34.4 ----= / 100 .... - 20 6.5: gu / 18 17-= I --- : )ao 12 23 52 31.3 - ~ -- 18 - 29 -= 8" 14 : -- 19-= 13 18 40 34.0 : ~ '22 124.00 20 : 100% '3D EM,.~ F~~M 18 36 JI'IIOJECT ESTATE MON BIJOU HOL.E NO. PREVIOUS EDITIONS AR& 08SOLETE . .. (T'RANSLUCEI't, ST. CROIX, U.S.VI. CB-V Ir1-8 PLATE B-16 • ltelo Me CB-VIM-9 JDIYIItOM DRILLING LOG 1 SOUTH ATLANTIC INSTALLATION ISMCET 1 JACKSONVILLE o• 1 SMUTS I • ..,.OJIICT to. IIU ""o Tv..,. o• OIT SEE REf-'.ARKS ESTATE l«ltLBIJOU ST. CROIX. V I. IZ. MANU·c:,.;t':ss OIUIOJIA' 1011 OP OOIILL - 1- DIII:ILLING AO.NCV GEO CIM, INC • 11. TOTAL 110. otr ov1ut~ 1 CMeTu•••o eu.-DEN IAMfJLES TAKKN , l ::\ &. MOL II NO. (Aa ..__- ....... HHa , .. TOTAL .. u •• ,.,. c010o: ooxo:s1-plastic jar storage -··- ! CB·VIM-9 L NAME OP' DIUL.LEIII FLOR RIVERA II. llLEVATIOJI OIOOUNO WATO:IO 131.21 ft. DI .. ECTIOM OP' MOLE ta. DATE. MOLE !•T••Tao ICOMP~cTao i 10-25-83 : 10-25-83 17. ELEVATION TO .. o• MOLE 134.21 ft • 7. THICKNESS o• ovt:,..uiOOEII GREATER THAN 20 ft. 11. TOTAL CORE III:ECOYE,_. F~ 80JtfNG 79 /) J. e. Ot:!OTM OIOILLEO INTO IOOCK none e. TOTAL OE!OTM o• MOLE 20 ft. II. IIONATUIOE o• INI,.EC~ /?'L h L._ GUILL 'Rf~O A8UOO "-"'¥· U,.___ /"" -yP aLEVATIOH DEPTH LEGEND CLAIIIPICATI"ON OP' MATE.IUALS ""'"-'-~ ~ CORE eox OR: III:ECOV• SAMftLI: 134.21 ~+~ • 4 = • /Silt, some clay, rock =/, fragments, little fine 1-::~ sand,.compact dark - • grayish brown. = • (GC)* 2-1 • _,/ =l""_ 3-=l/.·, = UY NO. . ' 1 11"./ 2 / 61% 6" 3 4 r--- 5 r-- 9 8 r--- 10 r---- 12 14 l 44 I . 22 1 i ' = . 4- .I 4. 5 -:==t-·7'· /'.__~:-=---:----,....,,-:-:---:--:-:-:-:-----i 3~. ~? s-=_V/ Silty clay, stiff, little 12 .. • very fine sand, few t·ock 4 - fragments. (CL) =/" / 67~~ 6-::/ / 7 .:" / 11" -~~// ~~ 5 -% 17" 8~ Siit, some clay, little -% fine ;and, very stiff, 9--= light olive gray and 6 7 16 - _,90-...,--- - ---: __ 6- ! - brownish yellow to 10~%% pale yellow. = (CH)* 11~% 12~% =(/*Unified Soils Classifica- 13-::~ tion symbol and legend : reflect lab test data -v.: results. 14-:. = 15~v. =~ ::jy .. ~0 18" 7 _a_; 20 34.8 1.00% -- 17" I 12---i---....,; 9- i S4% 16" 8 9 11 24 13 ___ _ 5 ; --I 8 ! 18 89% 10 18" -- -·-· ·- ·----+--. ..-, -~ _!_ , I 100% 10 f- 17: I 14" I _}_ 11 ~--J 18 ---- __ 9·:__-+---1--t 78% ·- 18" 9 12 ~ 29 --- . 100% 16 ~~--~/-~~1-0-+--t--; 13 12 29 50.6 r-- :/ ~ 19~f' / 14.21 20 :// 100% 17 ~ PRO.IECT I z: I 3: ESTATE MON BIJOU I HOLE NO. ST. CROIX, U. S. V.I. CB-VIM-9 ~TRANSI..UCEN7? PLATE B-17 'd - OIVISION INSTAt.LATION ISHEE T l DRILLING LOG SOUTH ATLANTIC JACKSONVILLE o• 2 SH!:!:TS 1. ~lllOJECT 10. SIZE ANO TYPE: Of' 81T SEE REMARKS ESTATE MON B!JOU, ST. CROIX, U.S. V.I. II. OA Ull • .,.. U<VATOON >HOWN rw11 w IISL) • L.OCATION (C.-4...,_.., s._,.._, ~1<;1 V: 1 n711 <;On V= 711 Ql;<; 12. MANUP'ACTUIIIIER'I DESIGNATION OP' DIIIILL I. DIIILLIIIG AGKOICY CME 45B(Hollow Stem Auger Drilling) GEO CIM INC. fl. TOTAL NO. OP' OVI:"· 1 OI•Tulll:aa.o ! U..OI8TU._ai[D 4. MOLl: NO. (A• .,_._. ......... Uti•! CB-V IM-10 .UIItDEN SAMfltL.I:S TAKEN ! ?~ ...,,, ..... _, ; L NAME OP' OfULLE" I<L TOTAL NUIIBEII COllE BOXES 1-DlaStiC .iar StOraQi FLOR RIVERA 10. ELEVATION GIIOUNO WATEII remarkS Sheet 2/.2 •• DIINECTION OF MOLE j•TAIII:T&D IC~Lir:T&O 1e. DATI: HOLlE j 10-25-83 i10-25-83 IJY&ItTICAL QtNCL.IN&D oa•. II'ROM 'VIr:RT. 7. THICKNESS OP' OVE .. BUIItDEN greater tban 35 ft. 17. ELEVATION TOO' o• HOLE 133 • 32 ft. II. TOTAL COAlE RECOVERY f'QIIII BOIIliNG tl~ ' a. DE"H DfULL.EO INTO IIIOCK none 11. SIGNA TUllE o• INSPEC~ t:7 ~' L..tf?'.. !'• TOTAL DE..-rH OP' HOLlE 15 ft GUILLERMO ABUDO . .,. f<'"7V ELEVATION DEPTH L EGIINO CLASSIFICATION OF MAT DIALS 'ICOIIII: aox 0111 (Drur,.. r-!11:!:..Kt:" •. .,.,, of (D _ _.,,_., IIII:I:COV· SAM~L.II ltiiY NO. LO~ \f.'" • ....,,e-.J . ~ . 4 . I 133 .• 32 - I: I Silt, some clay, little fine ~ 6 = sand, hard, trace rock frag- 1 r-s 1-= ments, dark grayish bro~m, r-- 18 13.1 ' - I 1 I white silty concretions. 10 -, % - (ML) ~ 2 - ! ! I r-1-- -= = 2 ~ 17 3 - 9 130.;:\2 ' = ~ R.: ~ - 3 4-= Silty clay, trace fine sand, r-L- 1g = hard, rock fragments, % 12 - dark brown to olive brown [:{, 6 s-= ~ to yellowish brown. ru- = (CH) * 4 28 14.3 - r-- 6-= 16 .... z "' ...: = 10 "' ~ r-- .... "' = 5 12 c cnO.. 26 o c: E 7- - .,.. o ro = *Unified Soils Classifica- 14 .... ~"' % "' - tion symbol and legend z ... • c: ... _l_ +-'+-'0 8 - reflect lab test data QJ 'P- 0 c 1-= % c: c.·~ results. 6 .lL OJN V> - 25 c. .... - c: .... c: 9-= 14 '"C 0 .,.. QJ n ... ~ .... ma.o.c - :;(, .2§..._ "g~"'8 -= ~ "'-o 7 .l.L ....,= 0 ~ 28 V')00 cu 10-= M: .... 15 E N 10 = I 0 3: z 11 ....... )( 11-= .._ ~ ~ 12 CliO "' - ... = / 8 27 20.4 ::s "'= ::;, - r-..CCO+o) - m :w::........., ro 15 >OM C 12 - "' 1 .... 1 I 121.32 z z.,.....,....3 = Silt, little clay, little 11 - very fine sand, hard, white 9 ~ 13-= and brownish yellow stains. r-- 45 - (~1L) 119 .s:: 3.5 = o/ 25 14-= ~ z ~ = 10 - Silty clay, trace fine sand, r-- 51 15-= hard, mixed white silty 100% 27 . = concretions, light yellow- ~ !j - ~ ish brown, few rock 11 ~ 16-= fragments. r-- 47 P3.5 - (CH) 27 6.5 = - z ~ 17-= = ~ 12 ,.n_ 51 - 28 18-: % = ~ 13 ~ 19-= 0 2o 38 9.5 = % 113.32 20 = / 14 14 EMMGA!~~M 18 3 6 PROJECT ESTATE ~10N BIJOU l~OL£ NO. PREVIOUS EDITIONS Allll:ll O-.oLIETE. ST. CROIX u.s.v.r. B-VW-10 (TRANSLUCVIT) PLATE B-18 DRILLING LOG (Cont Sheet), Hrv~oriON !OP m I-4Qlt 13 3. 32 ft. Hole No. CB- V Ir~-10 I'IOJfCl , INS l AUA liON 1 ~ttT --z· I ESTATE MON BIJOU, ST. CROIX,V.I. JACKSONViLLE I 0' 2 '""'' CLASSifiCATtON OF MATUlAlS '4 COif lOX 01 REMARKS flfV .. TION Dfi"'H LfGfND ( Dn~n/Uioll) RECOY- SAMPU (Dr.Jb"l ''"''· .... .,,, /~u. "'IJth uJ t •• ftb fRY Nt: alow~'"'hrn .. ,-. '"·· •I .,,,,fi, .. ,.,1 c d . N W s • 13.32 - Rock fragments,some silty 18" ~ - ' fine sand,pale brown,little 14 53 29.4· - 2' - • • white silty concretions.(GM) 100• 29 - ~ ~5" W2 . - Siity clay,trace fine sand, - I 2~ hard, light yellowish I 15 26 56 2.5 : brown to pale yellow. 83% 30 2~ ~ (CH) * 8" / ~ : I 16 ~ 62 2~ /100% 35 : ~ *Unified Soils Classifica- 8"/ ~ 2s-= tion symbol and legend / 17 -~ 36 21.5 - reflect lab test data 100~ 18 5.5 : results. 2u-: ~ r6 .. I ~ : 18 .~2 52 : I 106.32 89% I 30 2 - : Clayey silt,some fine sand, 8" _.14.. rock fragments, stiff, 2a-: yellowish brown (ML) 19 _g_3 88 128.5 - ·,nm~ "" 2~ v Silty clay,some fine sand, 8" 23 hard, light yellowish brown. - (CL) 20 I 33 02 -- I 100% 69 103.32 3lT--l/ Silty clay, some rock frag- 6" I 17 Ground : ments,little fine sand,stiff I water 31-:: to mediu(ci)llowish brown. 21 24 67 16.5 first ~1.5 - RQ'l: . -~; noticed. - Silt,some clay,little fine 8" ___l.8_ 32-: sand,rock fragments,compact - friable,light yellowish brown 22 __35._. 82 : (ML) 100 47 3 - ~ Silty clay, trace nne sand, ~4" - hard, light yellowish _lQ : 34-:: brown. 23 _j£_ 31 ~0 - (CL) _li_ - / - tnn'l' ?3 98.32 35 - : NOTE: -= : Groundwater noticed initial y at ~ : 30 feet depth. The hole co lapse , --: however, and a final water evel : could not be taken after 24 hours _: -: _: : -- -= : --:: : _: I I : : -= : - ENC:.. ~RM 1836-A aro. ,..,. o.--u.•-a•s NO~ ESTATE MON BIJOU ~HOU NO ST. CROIX,U.S.V.l. B-VIM-10 PLATE B-19 HeleNe CB-VIM-11 I DIVIS!ON INSTALLATIOJNACKSQNV!llE lSHE~,T ] b-=D"'R""I"'l.,..L_IMG __ L_OG_--l'---S_O_UT_H_A_T_L_A_N_T_I_C ___ +----------- -·--___,.-JL::o::•...;:.....:.:.•H.:.:•;.:•..;..T::_• 1 . ..,.oJECT oo. sou AND Tv"" o• e1T . See remarks . lr-:!;:ES!,!,T;:AT;,;E:,-;;:MO~N~B~IJ~Q:!::U+.-::;S;.:..T.;.• ...::C::.;R:::;O I:.:;X:..!.,_V:....:•:..:.I.:..• --~1"· DATUM f'OOI ._._._, ouw!IMOWN ,.,.. • JGJ.) Lxoc:Tl-'-o· 1~74 640·--v··:.--74 780 M<:l 1.1. MAMUP'ACTURCWI DllSfGNA ION OP OlltiLL .. DIIILLING AGENCY CME 458 __!iEQ CIM INC. 11. TOTAL 110. OP' OYEIII· JDtaTu~~~~:•ao : UNOiaTuiiii•ED 8URDEN &Alii--LEI TAkEN! 23 - &. HOLE NO. (A• _,__ ........... fffle 10. TOTAL NU-EIICOIIE ..,XO:S 1-olaStiC .iar StoraqE _.,___ [ CB-VIM-11 L MAlliE OF DIIULLDI FLOR RIVERA Ia. ELEVATION GIIOUND eAT"II 117 • 85 1-- Dllti:CTIOM OF HOLE ••. DAn HOLE lio~26~'83 ! clo~~6~'83 7. THICKNESS OF OVEII.UIIDIEN greater than 35 ft • 17. ELEVATION TO .. OF HOLE 136 • 22 ft • ~· DEO'TH DIIILLED INTO IIOCK NONE 11. TOTAL COfll£ RII!:COYI:IIIY f'OR 80"1NG 65% , '\ ~·TOTAL DEO'TH o• HOLE 35 ft. II. liGNA TUllE OF INSPECT~ U ~. /.Y. r, I GUlli FllMO AILJDO (;47_ UA#e CLAaiP'ICATION OP' MATI!fUALS 'It CORE BOX OR ELEVATION DEPTH L.EGI:ND (D ... ,.,_., "'ii~\1- --=~~~~ ft. • lft. ~ c 4 o I 136.22 : very stiff,· dark grayish - Silt and clay, some f1ne sane~ 1_: brown. {MH) - 13.8: 134.72 1.5•-,· -=HH-t+-----------¥--=~%~--+-=-+-----+--1 2'-= 1 1 .5:"'/ .-- Si ty cay, trace fine sand, : hard, few rock fragments, - yellowish brown, white 3_: silty concretions. ;' 42% = {MH) * : 4-:: : - 5-:: :. 6-= = - 7_:::. = - 8_:::. = = 9-:: = - 10-= --- 11-:: = i - 12-= = - 13-:: = - 14-: --- 15-: -: 16-: -: 17-: : - 33% " / 6% P" ·-· 11 -· 12 f-- 5_ i 5 12 .:.7 ___ ;__ __ ~ ...; :5 s- 4- oc-:c. ..., 0. 6 W N V1 ~ 6 c:: ·~ 13 16.4~:5~...., 7 ~c:: \j a. c.. Q) ----- s.. 0 Vl-+-1 7 9 20 "' '- c:: "'0""0 .. 0 c:: ou tti= 0 ...,0 .. 1./) ("""') = Q) 11 E; ._ N ~ - ·------ 0 !- X 3 .. Q) 4-:;0,- 5 9 17 8 s-rc Q) "' .. =..c:: ::. ,-- c.:-> "':i~-.........~ >C·M t:: '<::::r I I 5 ~ ---- z: ................. :::: 8 19 16.1 11 JL 11 22 _.Jl~~-­ ] La- 23 15 ~ ~29 11 6 1---- 9 20 11 9 f--.--: 11 24 14.9 - Silty clay, little fine sand 118.22 18 -v _Q_% '-.Jo·---l_;;13:o.__ __ ·- = some rock fragments, little 19 =v roots, olive gray. (CL) 116.22 20 : EM .. ~!~~M 18 36 P"EVIOUS EDITIONS A"E OIISOLETE. (TRANSl.VCI!N7'.) PLATE B-20 5" / / / / /83% --·- P"OJ~CT W- 13 8- 21 14 _13 - --------< 5 ' ESTATE MON BIJOU lHOL£ NO. ST. CROIX, U. S. V.I. CB-VIM-11 e DRIUING LOG (Cont Sheet)'""'"' 10 N ' 0 ' Of 140 " Hole No. CB-V!M-11 INSTAU.ATION MON BIJOU ST. CROIX U.S.V.I. JACKSONVILLE , SHffl IUVA!ION Dt!P!H LEGEND b 116.22 115.22 21 22 23 24 25 5.5 26 10g,22 27 28 29 30' ~ 31 ---=1 =1 I -1 : 32 ---=1 103.72 S2. CLASSifiCATION Of Mlo!UIALS ( Dntrill-} d Silty clay, rock fragments, very stiff, white silty concretions, dark gray to olive brown, pieces of wood on sample 17. (CL) * % COllE lOX 01 lE .. AitKS RECOV- SAMPLE (Dril/"'1 ""''· w~1,,. l .. u. tltptb uf ElY NO. .,,.,,,""'· '''·· if "1"''"••1 J r 24 *Unified Soils Classificationl'-;~:.;....-~~::._1--1--1 symbol and legend reflect lab test data results. Silty clay,little fine sand, very stiff,little rock frag- ments,white silty concretions dark gray. (CL) Silt, some clay,little fine sand, medium,yellowish brown, and gray,little white silty pockets. ( ML) .Silty fine sand,trace clay 23.4 26.4 24.1 33.8 ' 33 ----= - ~ brown i s h ye 11 ow. ( s c ) -3----+----------~24" 102.72 33.5 I iclayey silt,little fine sand,•l' ! 34 I I stiff, pale yellow. (ML) 1 39.4 101.22 135 -1 _J __, -f -! End of boring 35'-0" ENC:,.. ~ 1836-A HOLE NO. CB-VIM-11 PLATE B-21 H.leMe CB-VIM-12 DRILLING LOG DIVISICSOUTH ATLANTIC INSTALLA ...... JACKSONV ILLE I._N_OJECT ESTATE MON 8IJOU, ST. CROIX, V.I. 10. SIZE MD TYN Of' GITSDl it SDPOn SampJ er 12ft. • UAI- ,_ Oft ..... ft <••--- MSL L NAME OP' DltiLLIIR 1&. TDTAL IIU-ER C""E IIOXES 1-fOr plaStiC jarS FLOR RIVERA IL ELEVATION GRDUIID WATER not enCOUntered .. DI .. ECTION 01' MOLE f8TARTaD I COMPLKT&D ll:JvallltTICAL. O•NCLIN&D ... DATE MOLl: i 10-26-83 : lll-09-83 ?. THICKIIItSI DF OVERGURDEN Qreater than 35 ft • 1?. ELEVATION TOf' OF HOLE }37. 99 II. TDTAL C""E RECOVERY F .... -IIIG 78% L')_ 11. SIGIIATURE OF INSP~ ./.7"_/_ .L.£--:::. ~· DEI"TH GRILLED INTO ROCK nO rOCk drilled le. TOTAL DEI"TH OF HOLE ~<; ~t ~liT! I F~Mn ARIIM ~/~ ""' 137.99 • : - 1_: : - 2_: = - 3-= = = 4---: CL.AUIF'ICATION 0, IIATUIALS (D-~...., 4 Clayey silt, little sand, stiff, weathered rock fragments, white to olive brown. (ML) ~.5 ---t--r--+-t----------1 5 -::V 11 =v.~ 6---= . - ' I 7 -=11// I =1// .s--::1// : :: / Silty clay, some sand, soft to very stiff, weathered rock fragments, white. (CL) 4 r- ~ 14 8 8.8 8.2 128.99 9 -::t=--:------ir------------+--~ : 1 : Silty clay, some sand, 10 _: / / hard, weathered rock : / / fragments, brown to :i/_'/ j olive brown. 11 - I" (SC)* - ,• I : . I I ..J 112 -v-- ·~~---~~48~---- --- = . - ~ ~3. i 13 ---= ~~ 4~_-J112 9.8; - 'I : '/" _6:r_4 ___ -li 4 =(;;), *Unified Soils Classifica- • - J o tion symbol and legend _.A!L! 85 10.3 5 _:!%· reflect lab test data 45 l : ' , results. 15 l 6 : -i 35! 75 ---= :, • 40' 7 ~~ ~135 8 1v·: ~ 60 :19.4 9 -_ .: _() 1- ' 1. 19.5- 1 '/. 31 l 2L 20.6 I I ! 16.7! I I i I 117.99 11o ·: /---' 27 I ENGFORMJ836 ~L-------------------------~ .. R~o~J~E~cT~E·S~T-A-T~E~M~Q~N~8~I~J~Q~U~~t~;"~0~L7E'H~o~--- MAR ?I PREVIOUS EDITIONS ARE OGSOLETE. i:l-Vlil,-lL (TRAJ'ISLIJCI!NTJ ST. CROIX u.s. v. l. PLATE B-22 DRILLING LOG (Cont Sheet)j"rv.riON ro• Of""" 137.99 Hole No. CB-V!M-1£ I'IOJfCT tNSlALLATION ESTATE MON BIJOU JACKSONVILLE i 33 ~· 34~ ,: -I, CLASSifiCATION OF MATERiALS (fh'""'IM) d Silty clay, some sand, hard, weathered rock fragments, brown to olive brown. (SC)* *Unified Soils Classifica- tion symbol and legend reflect lab test data results. %COlE lOX 01 IECOY· $AMPLE IE MAl ItS flY NO. (O,.;u,, ~~-~. w•Ur J.u, .,,lb 11/ .,.., •• n,. "'·· ;,.,,.,fu••'J f Blows N sW * .... ¥-~~----~~~--~----~ ~ : 100~~ ! 47 .. ------·-- ---1 - 10" ~- 34 :25 I 75 30 1 i 21 I I ~0/6" 10 , 5£1__, __ Auger__ r, 2" , 48 i 22 '42 87 11 67:; : 45 24" 44 ; , i : 50 : : 23 :---43 93 ;18 'r:b u "" .., .... "' ~ ..... ..., 00 >,o "'"' )CO "'~ ......... <I> <1>'0 .... c: "' -- U') "" OJOO ~' 000 .<:::0 "' ' .__ o- ..o c: 'OQJ c: OJ 0): U+J QJQJ V'l 00 ; 100% 1 r---: 35 --!--+-------------:---1--------+-j)~ _ __j_ _ _l__ i 102.99 . ''/ ENC:,.. ~llM 1836-A This boring was drilled originally to 22.5 feet depth between 10-26-83 to 10-28-~3, and stopped due to hard clay encountered. Because 'it was definitely not rock, the boring was relocated 5 'feet <~long <~xis toward boring CB-VIM-11 and redrilled w~th au~'ers to 21 feet depth. Sampling was then riesume~ to t e required 35 feet depth. This secon bori g was drilled between 11-08-83 and 11-09-83. I'IOJOCT PLATE B-23 ESTATE MON BIJOU ST. CROIX, U.S.V.I. ..olf NO CB-VIM-12 DIVIoi- DRILLIMG LOG SOUTH ATLANTIC JACKSONVIllE 1:r_T .!nTa .... o.~ ..... ESTATE MON BIJOU, ST. CROIX V.I. 10 .......... TY .. OP WIT SEE REMARKS 1- DfiULLIIIO AOaNCY GEO CIM, INC • ._ NOLa 110. f.Ae .,__- ....... HII•J -··-• ! CB-VIM-13 I. NAME OF DRILLER 10. TOTAL NU ... EIO COllE IIOXU1-Storaoe olastiC jar; FLOR RIVERA 11. ELEVATION OIOOUND WATEIO QQ 1' ft • a. DIRECTION OF MOLl: ta. DAT& MOLK b.I8TART•D IC~L.·T·D 0-26-83 : 10-27-83 .. 7. THICI<NEII OF OVEIO.UIOOEN greater tban 25 ft • •. OE..,.H OIIILLEO INTO IOOCI< NONE I. TOTAL DE..,.H OF HOLE 25 ft. 17. ELEVATION TO,_ OF HOLE ~50 ft. 11. TOTAL COllE IOECOVEIOV FOil -lNG 83% II. IIONATUIOE OF INI,.ECT~ ~ A£.. L .v: GUILLER~IO ABUOO ~- u-.,. ..... /- 1 ._ 97.50 106.50 = Silt, some clay, little fine /O" _5 _ sand,hard, few rock frag- 1-= ments, dark brown. 1 ~ 22 9.4 - (ML) 12 .5~-~~~-r--------------------~---r---t~~--t--; 2-=/ Silty clay, trace fine sand, V" 4: =/: hard, yellowish brown, 2 10 18.6 - trace rock fragments. 3 - (CL) j::l" / 10" I ...._L 4-=:// / 3 ~ 102. oo ~. 5 .... =-+>"'--.......JI------------+-I/ __ +---+-1=-9--f--+--t t; ~ 5-=' / Silt, little clay, little /5" __E_ ~ g' ~ ::/:/ / ~~~:ds~~~k ~~~~m!~i::· 4 -~ 34 8.3 g.:;~ 6-==v light olive brown. -18 ~i ~ ... (CL)* 15" • 14 a; N :n"' - "' -~ - 5 14 29 10.6 CIJ "' .... ~.~]/:/ /1" 15 ii=l v- = e-!?_ ., = 0 - 6 }l__ 29 9.0 t;g= ~ = / 16 E "'-:t: 9 05-X~ =vv Silty clay, little fine 11/5" r-1-- : ~8~ _ sand, hard 1 i ght o 1 i ve 7 9 20 g 8 :::1 .c - :::1 1 1 n-..:::_ b 1 . ,__;_.__ 1 . ~ .. ~- ~ ...... •v _ rown, mixed o 1ve gray, , -- ~ ~ ,-r / and pale yellow, trace 11 >o...,"' l:J~ "'' '"'~~l'. 1 8 ~ 49 ~ ~ ~ ~ 1~v 18'/ 9 w_ 14 93.oo 13 5= ~oo~ 7 · - / Silty clay, trace fine sand, z 1 11 14-::~ ~ very stiff, light olive ~ = ~ brown, trace rock 10 f-.11-- 21 _ fragments. )~ 10 • 15-:: ~ ( CH }* 1'--=T---+~__.;...+--+-'---i - ~II / - . 16-=~ *Unified Soils Classifica- // 11 f.J.z- 25 39.1 - tion symbol and legend / 10m 1 ::~ 16.5:~ reflect lab test data 1"-~""'t---+-'..._+--t----t 17-= results. 18" I..J.Z._ ~~ "" 12 ~ 29 ::]vv 1 :.. 13 ~ 23 19. 5 = ~QQ.%_ llJ...-4--t---1 86.50 _20 - 6 27 9.6 EMM~!~~M 18 36 P"EVIOUS EDITIONS AlOE ODIOLETE- '""OJECT ESTATE MON BIJOU I HOU NO. ST. CROIX, U. S. V.I. CB-VIM-13 ('TRANSLVCillf" PLATE B-24 .. .;~ ... · _ .............. '""".....,_'l' ' I I I I i I I I I I DRIWNG LOG (Cont Sheet)l'..,.,_ ""or HOU li.J6,.,v NOJOCT I NSTALLA'hOH ESTATE MON BIJOU CU.SSifiCATION Of MATERIALS ElEVATION DEPTH lEGEND ro..m,.iooJ ft • ft b c d 86.50 : ~ Silty clay, trace fine sand, : very stiff, trace rock 21-= fragments, olive brown to = ~ yellowish brown. . 22-= (CH) : - 23-= : % - 24--= : : 81.;60 25 - : -- = = - --- I - ~ ----- - = -- - = -- -= : -= :: - --= = = --: : - --= --- --= : - - -: - --= --- - : = - -: -= : - -= --- -= = -- ENC:...~ 1836-A 011'0. , ... or-u•·a. .. PLATE B-25 Hole No.CB-VIM-13 JACKSONVILLE r"' 2 Of 2 SHEETS 'II. COlE lOX 01 REMARKS IECOV· SAMPLE (Dr;u,., ,;,,, w•'" l11u. t11ptb fl/ ElY NO. ~, owS·'•N'"'· ·I(~ ''W'''"fi'~"'' • f 1~/ 9 i 14 r-----1 19 i3~.1 /loo% 10 I - - 18 -~ I IZ -~ I 15 rlL 39 I % 25 t:2:. ! IlL_ 16 r1L 30 i % 17 y 17 .lL 29 42.9 13 I I I I ! I'IOJICT !"""NO CB-VIM-lc ................ .&0 ,- .A.'"T DRILLING LOG I OIVIIIOOISOUTH ATLANTIC IIMSTALLAnooo JACKSONVILLE I:··,T 1 1 .., •• n . ~OolllCT tO. IIU: MD TYN CW .IT <;.!;!; lli'Ml!.DII"C:~ OC:Tl!.TI' MriN R l.lnll . OAT- ......... MSL • ltRIWK ,...--~ fL LOCATIOtl (~--·- X= -1- 075 774 Y " 74 514 IZ. MAMU~ACTUR~R"I DllSIOIIATIOII M DRILL ~~DIULLIMO AGaNCY CME 45B (Hollow stem auoer drillinol EO CIM, INC. tl. lg~~~ .. ·:a::Ltli:TRAKaN~ 018T].3a&o ! UNDnTUflla&O 1&. MOLE NO. (Ae .... _. • ...... tlllif -•·- l I':R-VIM-14 L MAllE OP' OIIIILLEfll 10. TOTALIIUM.IliOCOIIIliiOXEIJ-nlA~tir iarc ~tnra FLOR RIVERA 11. llLEVATIOOI GROUND WATilR R< ?7 ft • a. Dfiiiii:CTION OF MOLl: ~t·r•o fCOIIJII't-&TKD I[Xv&ftTICAI. QINCI..INaO 1&. DATI: NOLa 0- 1-83 ll-9-B3 0& •• IIPAOM YCAT. 7. THICICNI!IS OF OVEIOWUIODEN oreater than 20 ft. 17. ELEVATIOOI TOO' 0~ HOLE 91.96 ft. 11. TOTAL CORE .. I:COVI:RY P'OR 80RING 55% ' je. DE"M DlltiLLI:D INTO IIIOCK none tt. IIGNATUitl: OF IMIP'I:CTORWd'~ ~ j.. TOTAL DEO'TH OF HOLE ?n i't Guillermo Abudo IELI:VATION DI:~TH LEGEND CLAIIII'ICATION OP' IIIATIEIUAU '1. CORE IIOX 011 fDrut-. ,_.:•.=:.K! ... :.,,. ot (IJ ___ ...., RIECOV• SAMPLE lEftY NO. 1 n~(f-'J'•~ 11 • ...,,.c-J . ~ . 4 . f • ~L~bft : Silt, little clay, trace ~ ~ - fine sand, hard, dark 1 J_ 1-= brown, white silty 10 17.8 concretions. (ML) .. : % 5 .... ;, "' - IZ "' r:::: 2-= ~ .... 0 - ... r:::: "' = 2 6 21.0 0 ....;o. : f-..-·-~ 12 .... '+-E 6 "' "' ... 88.96 % ... N VI 3 -v IZ .... "' ~ "' r:::: "' - Silty clay lumps, very stiff r:::: 00 ...., = "' 0 fine sand, >leathered rock 3 10 22.9 0.. 0.. "' 31 Ov> "' 4-:: y fragments, olive gray. 1--- "' M ...., 21 ... ...., "' .5 : % "' C"l·~ 0 (Boulders noted in ~ "' c- u - 25 r:::: ·~ 0.. s-:: difficult drilling). "' -"' s.. [/ ~ .... ';Oo Q) (SC)* 4 "' ...., :: 75 14.2 .... f' "' 1--- E 3 - ~/ 22% 23 0 S..N 6- s.. "' - / '17 .... ~~ "' - 'aJ s.. - ..,_ ::::> : 0 1-- "' .c: ...., ::;¥'// 5 21 ';0 co "' 7--: 43 15. ........... "' -- > OM (V~ 22 I .... I II .5 = z .......... 3 a-= % I __!I_ : /y 6 ~ 51 9.7 - 9-= t) 11% 21 ;?::! : z 31 t) ';0 1--- - 14.6 10-= I) 7 ~ 53 ...., = o-- 1Q "' ' ·~ ,..; 01.46 0.5-v ~ "' co u-= ~ QJI -- - Clayey sand,some silt, mixed 22 -M -r:: 8 47 24.~ ·~ I - weathered rock fragments 21i s..o "' ..... 12-= very stiff, light olive .... s:: = brown and yellowish brown. V,: 9 .-<O I (SC) * ~-- :=::.c - .......... 13 -v 9 ~ 17.~ > 0.. 56 '"' '-:: ":In "'"' 3.5: 1nn• u 83 "' [/,:, C'>·~ -v c.r::: 14--= - ·~ .... 16.3 ... : *Unified Soils Classifica- 10 __; 3/6' 00 v "' .... 15-= tion symbol and legend = reflect lab test data li Cl> I )( v results 50/3 -eo - _..,,_ 11 •.- en c.. 16-= 0/3" ... 0.. - 21 "CG>c<: : v 7'h .... C"l Q) .c - II.(. 45 r::::-+> .,... 0. 0. 17-= '- E cv t:; 12 ISO OO"C : .cu .... 1- 82 31 ......... : ~OQJU") <? Q)~QJo:::t" 18-:: % r:::: ......... 14" / "' II 1-R M•r-0> : CX).C N ~ 13 31 I+> .... - 1;:;% 51 16 C"l o ..... 1---- II 0 +-J,..... 19-:: 20 ......... U"J ..... C"l ..... - f..- I +-J C::0 171.9fi 120 : 28 1 !5 ~;:: ~ r:::: O..>< ENG FORM 18 36 PREVIOUS EDITIONS ARI: O..OLIETE. .... o,acT tsnr "E MON sr.,uu IHOL.IE NO. MAR 71 (TRAifSLUCmf1') ST. CROIX,U.S.V.I. CB-Vm-14 PLATE B-26 Hole No C 8- V I M -15 - IOIYISIOM "RILLING LOG SOUTII ATLANTIC INSTALLATION I SH!:l. T J. I JACKSONVILLE fo•l ·~ 10. s•ze: AND TYP~£ o,. en see remarks 11. TOTAL NO. OP' OVER- !DiaTutte•o J, UNotaTu•••o &. MOLlE NO. (Ae .,__ .......... IItie •UfiiDI:N IAII~LI:I TAKIIN 1 13 -••·-• i CB-\'IM 15 a. NAME o• OltiLL.... 14 TOTAL NUII.ER CORE .OXU 1-plaStiC jar StOragE FLOR RIVERA ... ELEvATION oRouNo ... nR no water a. DI .. I:CTIOM OP' MOL II 18TAAT.D fCO~~·T·D q. DATI: MOLl: 1 11-02-83 h.t-02-83_ 17. ELEVATION TO" OF HOLE 84,14 ft, GREATER THAN 20 FT. 7. THICKNESS 011' OVE .. eUIIIIIOEN 11. TC>I' AL CORE IOECOVEitY 'OR .CitiNG 69% ...., ~ ~· DlltaTH DRILLED INTO JIIOCIC ~· TOTAL DEPTH OP' HOLII none 20 ft. II. SIGNATURE o• INS .. ECTOR ~ /'7./ LL: GUILLERMO AI UDO >-'¥-[./A... JP ·ru IILI:VATION DEPTH LEGEND CLAISII'ICATION OP' IIATUIIALS ro_.,...., ft.. ~ c 4 84.14 - Sandy clayey silt, compact, some rock fragments, dark grayish brown. = 1 -. L-= = 2--= = - 3--= = - (ML) 4--= 3 _6_ 79.64 4. 5-: --=t-+~+----------+--;5~0%4--- ... L +----! 5--=l/ • Silty clay, trace fine sand, 9" / ~10 i , =l:( hard, rock fragments, olive 4 10 25 ' 3 9 - small white silty concretion ,1 · 6.:...:: /' . §OL ,_ __ 1 ... 5,___,'------1 = • (Cl)to(GC) .5% / fl___] 7-=. / /~- 5 ~ 29 :7.7 ·-/ 5" / 8-=_/ Clayey silt, some fine sand, / 6 2 - h d t 1. 1 k 1 h.__ 30 i15.0 _ ar , compac , 1tt e roc / En'l': lR. , 9- fragments, o 1 i ve brown, .jL~a..}----f.W.-f--""!,r-----1 =/ varies to yellowish brown 6, / _g__ -- silty clay. ~_, . . 7 ~27 h4.2 10= / ( CL) * !L-'Rt1!:1J.Q'l:f--f11.!L-4-1':---r; --: 0.5- 6 "/ J : 11--=/ .5) )2_~ ! - / 8 ~_j39 i21.9 = /92% 19 i 12~/ a" ;i- ---- ~--t---; - / 9 27 50 13. 9 13-:/ i100% n- : >-· 69.64 4 1~~~-...;;~...,..:./-+------------ll 8 ;,-~ 10 ;~---· ;5--=v-IY. • Weathered rock fragments, I";;~"""'000;-~---1P:4t....:7_--+i--l---i = hard silty clay lumps, z ~9 i = • light olive brown. % 11 ~ 4 · 33 h· 16- ' (GC) * ,.- ~~2.5 -v- ~-1 : • *Unified Soils Classifica- p: ,--= tion symbol and legend ;,. ~ 0 17 : y reflect lab test data 12 rn-- 60 :/ • results 50% W l7 .14 80 16.0 12.5 06.14 18 :/ layey silt, little fine : sand, very stiff, trace 19 -=:/rock fragments, pale yellow _ o white. (CL) 64.1~ 20 : 24" I_£_ 13 lu_ ~ 33 10.5 1-- ~3 • 100% IENMGA!~~M 18 36 PREVIOUS EDITIONS ARE OMOLETE. PltOJECT ESTATE MON BIJOU I HOLE NO. ST. CROIX, U. S. V. I. CB-VIM-15 (TRANSLUCVV1? PLATE B-27 Hole Ho CC- 'I' I'' -l F, 01\IISION INSTALLATION DRILLING LOG SO UTi; n.TLil.fiT I C JACKSONVILLE ti'"OJECT tO. SIZE AND TY~ OF 811 SEE REf'IARY,S ..._,....eE,.sT~Al7iTioiE'H':M:::O::N=::B:::IJ:::o:::uT.'=s=r.-' • ....:;c.:..:RO.:.:..I x"-':....;vc.:·c.:I_. ___ -t "· DA' u• • .,. ~~~VATIDN ~"o•" '"'" _ .. L, H. L.OCATION (C....,MiMaa or Sr•Nn) ft1Sl X- 1,076,627 Y = 74,081 IZ.MANU~ACTUIO&IO'IDI!IIGNATooooo•ooo•~~ II. 0101~~·110 AGENCY CME 458 r,m C:TM. TNC: 11.~3~~~ .. "fA3lLil•T"Atct:N ICM''i'jaco j UNOtiTu.-•.:o ._ MOLE NO. (Aa _._ - ......... fftfa ............... : CB-VIM-16 L NAME OP' DRILLE'" 1'1 nR IHVI'RA ,._ToTAL Nulla&RcOR& aons 1:Qlastic jar storao fl. ELEVATION OIIIOUND WATI:" 00 Water &. DIIIII:CTION OP' MOLl: lco...-~•T•o 11-n1-ll3 11. DATE HOLC ~··TICAL. OIMCI.INIEO DIK.O. ~ROM ¥& .. T • . 1. THICKNESS OF OVEIIIBU .. DI!N greater than 20 _feet 1'7. ELEVATION TOP OF HOLE ]~ .67 ft • 11. TOTAL COftl: .. I!COY£111Y FOfll: 80"1NG 85% /J ~ OI:P'TH DIULLEO INTO ROCK 000e ... IIGNATU"I: OF INSPEC:~ _,;?/ / ~ _ •• TOTAL D&I"TN D~ MOLE 20 ft. UILLERMO ABUDO ~- VAIMO.V ~ • 79.G7 - • • Silty fine sand, trace !1:!. 10 I I ~ = c clay, weathered rock 1 ~ 35 . 9.2 a. 1--= (1 < fragments, grayish brown. r--:-=- ~ = l ' (SM) % 10 i ' I Vl 78.17 2-=_Vv, Fine sandy clayey silt, 15 " ;1 1 10 2 . 30 13 _ 3 ~~~ ~N~ i compact, few rock / 2 ·w .. = fragments, ye 11 owi sh brown. 1 83% -· 18 it c:: +-'o' 3-=v' (SC) * ;~ o;::"' -- 14" I 12 I ~ ~ ~~ - ~ '0:: .~ - ;.: 3 10.19 4.5:;;~§2:! 4-=1/.' " 78% 9 • -g g = 5 = <---- f---·· ~- :l • N U - • 15" I 7 "' ~ X:;; 51V / 4 =I 16 8.3 ~J~~ 6-=v . 8.3%..,--- 7 ~~;:::;-~ - z __13._ r; ~ .!B 7.3::._v 5 ___i 19 17.3 ~~ ~ ='' 10· z+->~:.: 8=--/· % 6 ~~ 45 - 16: 9- • 9,5._:::: y k I 10~=-VV Silt, some clay, to silty ~3~ 7 ~32 3 ' clay, little fine sand, ~ hard, trace weathered 26 :. 11-::/ rock fragments, strong ~ = brown to dark brown. 8 ~ 28 i 21.1 - % 14 ' ::~~ (CL) • 4 9 ::: ~ 14--._=v 7;" / r--!9-~ 17.6'! 10 ~ 35 15 : 1/ 94% 18 ·-v *Unified soils classifica- ~" c=...·-------: : tion symbol and legend !!/.:.''' .-!!..-j • = reflect lab test data 11 27 i 51 : 23.9 16-=v results. 89% ~ ' 17~/ ;,:, 12 ~ 48 t 18.< 181/ i 13 ,ll--; 19 =I / ~~ 4o 2o., 59.6] l2_Q_ =l/ 28 7.6 70.17 55 ; 15.71 I HOLE ~0 tB-VIM-16 EHMc .. !~~M 18 36 PRo:v•ous o:ooToOlls All& oasoLEn. PROJEcT E::>TAl E MON BIJOU ST. CROIX, U.S.V.!. (TRANSLUCENT.) PLATE B-28 I Hele Me l,;B-VlM-17 DIILLIMG LOG IDI\Im& C::OIITI-1 ATI_ANTIC IIITAL.LATIOII JIMaaT 1 JACKC:ONVIILE lcw1 SHan• l.""l'liOJICT 10. IIU MD TY ... OP OIT SEE REMARKS r<oT~T~ IM\N RT.lOII C:T CROIX V.l ·D"T"'"""" -ISHDWII.,..w-.J ar.:;X~~,.;_1:.,o~;;7:,;r:,:~:,;:;;:,:;,-v,_....:..,_'=__;"'~:...:,.;t:..;:7_:6_:Q,_...,_... _____ -I II. MAIIUPAc-TUIOOWI D~O!~IION OP DIOILL a.oiOtLLt•oa ... c.. CME 45-B (Hollow stem auger .drilling) F:l'n I'"TM TNt'" tl. TOTAL NO. Oil' OVRIII· 1 oeaTuRa&o ._ MOLIE·NO. (Ae ............. dfler ~........... ! CB-VIM-17 8UIIIDIEN IAM .. LES TAKI'N • l :::1 i UNOtiTUIIIa&O I. NAME 011' IMUL.LUI: ,._TOTAL IIUIIOIEIO COIOI! 00111!1 1-DlastiC .iar Storage 1'1011 RTVI'RA Ia. IELIEVATION OIOOUIID WATIEIO 57 • 22t 1 -?-A":II • .1~., 1 1 _c •• DIIIII'CTION OP' HOLE ••· DATE MOLEI 1• 1 TART&o 1 coer..t..k' ao o ... P•- van. 1-01-83 1 11-01-83 17. ELIEVATIOII TOI' OP MOLE ]::J. 4 ]L...!f..!:tc,;•..,.-----~ j,. TMICI<NI!SS 01' OVI!IOOUIODI!N areater than 2Q ft, II. TOTAL COIOI! IOI!COVI!IOY POlO -IIIO ]4 - .. • Olli'TM DIOILLIEO IIITO IOOCI< not dri 11 ed ... IIGMATUIOIE OP tiiii'I!CT""_.U /? / r-~ 1-. TOTAL OIEI'TM OP MOLlE 20 ft, lr.IITI I !:'DIM\ IIQIInO ~ Y~ tJI' ~ 70.47 = 1 Silt, some clay, rock k: 4 = fragments, trace fine - 1- sand, dark grayish brown. 1 ~ 14 21.8 = (~ll) 9 8 = k 8 2--= 2 1-- -:;: ~ = ~ 24 16.7 ~ r:nC. 3 - 0% 14 <= E :-~=~~ ~~~~.~+-S-i_l_t_y_s_a_nd-yk-cf_l_a_y-.-v-e-ry---~[%~~~--~~5-~-~~~~ ~ =V " stiff, roc ragments, ~ ~ 8 41~ olive brown(sc) * [:( 78% 3 ~- 18 14.7~~;; 5--=~i) 1- "f i~~ = J • 4 .!2-- 25 17.0 -g-:;0~ - J 72% 13 10 = 0 0 6;-~:~-~~~"r+!-S_i_l_t_y __ f_i_n_e_s_a_n_d_,~l-i_t_t-le----~~1nn4"~~~----~2~7~t---t-~-:;:g~ ~ 7~ ",;tJ ~~~~~ ~~~~n:~i~?n~~iff. 1/?R~ 5 ~ 35 12.9 ~j~ ~ = ,., L. IL 6 10"" ~ ; 8 ~-:--- >OM.._, - ;~J i·" ne :>cwu,Lrd<;" , i"t, 6 11 1 ...- 1 ., =·:--- 1,, yellowishbrown. (SM) --23 99""' ........ ~ - ~-joi. ' 11? • :ol: 3 G7 .47 64.47 U2.47 61.47 " : ~ l t Weathered rock fragments, IL ~ - ' I some silty fine sand, 7 29 10--= i yellowish brown. (Gt-1) * ,nn.. ~ 79 10.7 = r ~ *Unified Soils Classifica-rz 43 11--= j ' tion symbol and legend t-- 34 - ~ reflect lab test data 8 63 9.0 = , resu 1 ts. " '2'g'- 1~ : 1.:: 24 = 9 L0/3" 0 - /3 11.6 1~ % I-- 5G.97 _ brown & light gray.(CH) 68 20.8 13.::>_/ Sllty c1ay,traceT"1ne sand, I),:. 25 14--=/ very stiff, light olive 10 -36 1--- % 32 ti:i.47 '" =/. • in wet silty clay matrix, 11 ~ 21.7 = • )I' Weathered rock fragments, r;!. 30 16--= /. little/i:)e sand, light olivE ~ 54 !:i 3 . 57 1~;~ • ~~~~~~so: clay,trace fine l%:% 14 ':_ sand,stiff,olive yellow & 12 ~ 29.3 pale brown. (MH) "Is 30 ::i ~' !3 l30 r c;n 47 : ~ 19., 20 : 100% 21 PIIIEVIOUS EDITIOHS ARII OeiOLIITII. (TifANSLUCIUIT) PLATE B-29 "RO.IIECT ESTATE ~lON BIJOU ST. CROIX, U. S. V. I. THOLE NO. CB-VIM-17 Mel• Me CB-VIM -1b DIVISION IN., ALLA" 011JACKSONV I LLE l""UT 1 D«JLLING LOG SOUTH ATLANTIC OP' 1 SHf:ETI I. -OJitCT 10. aiZ& AND TY .. OP etT SfF RFIIARKS ESTATE MON BIJOU, ST. CROIX, V.I. .UAT-~- --ft,.;;L--.. 1"- ~AT-f-- ....... II. IIAMU~M;' UtiiRWI DRIIOMATIOM Of' -ILL I._ ~RIL.L.HIO .wtaNCY CME-45B GEO CIM INC. 11. TOTAL NO. OP' OYEIII· 1 DI•TuR•IEo 1 UNOISTUit •• O .. MOLE NO. (Ae ...... • ....... ffrle ' CB-VIM-18 HIIIDilN IAII~LES TAKI:N: ··,1, .., ... ~ L NAME OP ORILLD , .. TOTAL IIU ... RIO COlOR ~XItl •-plaStlC Jar StOragE FLOR RIVERA tl- aLIEVATION G"OUMD WATIER 56.73 ft. .. OIIIIECTION OP' MOLE 18TAitTIED IC~L..TIED ... DATE MOL& 11-01-83 : 11-01-8_3_ IIJV&ItTICAL QtNCLINIED D&e. ~ltOM VIEfiT, t!:_ THICIUII:II OP OYEIIIaUIIIOEN greater than Z()__!t. 17. IELEVATION TOll' OP' MOLE _64.60 ft. Ia. O&"M DRILLED INTO flOCK none 11. TOTAL CORE "I:COVI:IIIY P'OR eoRtNG b~ /) ' IS. SIGNATUIIIE OP' INI~I:CT~ /7L 1 ~ je. TOTAL ORI"TN OF MOLE 20 ft. GUILLERMO ABUDO · IELEVATION OE~TH CLAI&IPICATION OP' MATibUAU 'loCORt: •ox c.. (DrUI .... , .. :·::..w.:,.••• ... h ol LEGEND (D__....,,_., IIIECOV• SAIIPLE ltiOY NO. IBl ows-r ··-;.· '\!' .... , •• ..., ft. . ~ c 4 . I ~4.60 = Fine sandy silt, trace clay, !.:. 6 - few rock fragments, very r-- 1-= stiff, dark brown. 1 ~ 24 14.3 : . . - (Sf~) 12 - 13",/ 2-= ,J.Q_ = ..... ..: ;;2% 2 r1L 44 15.8 "' = "'"""' ..... c:~ 61.60 :>4 0 0. 3 c:~ E :. tr little 1-5" / 0 "' - / Silty fine sand, ]2__ . "' .......... = clay, varying mixed i "''"" <:: ;.,: 3 31 11.9 .... 0 4- weathered rock fragments, / _15 I +'N 0 = I .... 0.0-" light olive brown to 83% lfi <:: <:: "' - G.IO <:: olive brown. 14"/ l 0. +>·~ 5 - 13 . (SC) * -o Q...-.j....l )-= ' 3/,r !... 0 o.c - 4 10 18 tC~V'!aJ - ' 13.8j1~"0 -~ I 6 -,, ~· J 78~6 8 tC = 0 0 )-= l.j....)OQU f-u----1 ;V'IM: - I 8" IE . N ~ - v / 0 S.. X.j....l 7 - 0 • 5 ~lfi 42 11.7-t~;::~ '-= = A41c 2fi_ • Q) ;:c - ; j 9 , :J ...c = "'=' 11" 17 ~ ..-- t.:l S- - 'rc::....:: ......... = 8-: 1 - - i >OM+-1 ' 6 22 47 s.r-~:::.~~ ! = I ' ' 9-= ' 6D 25 z :.;::: --- --- -~- = " 13 - ·'J iJ I 10-= 7 28 47 9.7; - 33: 19 ' = ' 0 0 4.8! u-= 29 = ? 0 8 28 61 ' I - I ' 12-= c o: 33 ! - c ·------ I - 6" 20 = o/ / 9 43 62 11.5 13-= /r 51.1 3.5 /33% 19 - ~ Silty clay,trace,fine sand, z ~ 14-:: very stiff, light olive ~35.5 = gray and yellowish brown 10 .1.L-i 27 15-= to olive brown,white silt 15 ' . pockets. (CH) * % , = ~ 18" / ~ - *Unified Soils Classifica- 16-= tion symbol and legend 11 11 23 33.1 : reflect lab test data j,Q.Q% ~ : results. 8" 13 17-:: / 1--- 31.3 : ~ I 12 ~-· 32 / - I 1oo 16 18--:: : 4" I ~ - 13 ~28 39.6 19-: /~001 -- = ~ 14o ,;o ?0 - 16_ EM.,G .. !~M 18 36 PIOOJECT - t:.~ lA It:. MUfi ll hJUU HOl.£ NO. PREVIOUS EDITIONS AlliE 08SOl.I!TI!- ST. CROIX U. S. V . I. B-VIi1-18 (TRANSLVCVI'T.) 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I I "IIi I 1 il 1Im II!, ···f"ITI~' I 'II II , I I > I I I I t-t-:'T BORING NO.: CB-VIM-1 · u_ij'.u ri-_·u '"''·· .,.Jj''''"·'''U''''''l .. ·~.~~-~~~~ ,, -.~·~~. , ''-! ,. ,,i -w .u H~ ,, ltJJ.I , ,, , ' ,, u rctr , 11111 ' , " ,,, , n 1 S 1 3 4 56 S 1 7 8 9 n iT , "'·'''II', 'uJl. ,,, 1u , , ·.l!'" " ,,,1,, ,1.,.,,+++++-l+t-i-i-1 ...Jl~ ''' amp e , , 1 •:!l<illJliiJj· 1'11.1 1 ''''' [IIi 1 · • ,, • "" ,, .. ' ' II I I I 'I' dl! 'I :1111 11 111 :1 i '!II I ilit I w~; = 8.8-;.7 W% = 13.3-45.3 i1 1 -f+H#H:: j ~ffi! 1 ' • i', : , ::'· LUIS 0, GARCIA & ASSOCIATES. LL = 24.6% LL = 39.5% , ttl~. · ·141. , un t , GEo c1M. INc. PL = 16 5% PL = 10 5% ' .I 'ill I I JHl !lUi !l!J' u I . . . • 0 • 1 1 , 1 T 1 .q: qi 11 , "''EJ. il.i.!.: '' 11 11 1 u 1 Geotechmcal Eng1neenng Consultants PI = 8.1 PI= 29 I II u :::''1111 J! l'll':i~·t"'!lll.l.ct'. I Ut PO BOX447•HATOREY PR 00919 I I I '' 1:1; • 1 I li':'!•l:i•ll•llillil II · · • .. D t · 1212 83 tIll LJ.l. ;III:I:;IJI ,:Ill !l:l.JIJ!l.!im I a e. - - ! ,11) lll,.j-~l!:ril:,: :"~ ;:llillJIJ~ R~ f++ TELEPHONEB09-763-106,5 ~II II I I I I IJJJJJ J J~J~~_mJK~,~~~J~.~~~~N~~JJ~JJ~J~J ~J ~J~N~, ~- ~ c: 00 ,....._ l.C' N GRAIN SIZE DISTRIBUTION - Cot,1BINED SIEVE & H~pppr~p~:JL~~ALYSIS -~ ... · n "'I ·•('\'.., ,·J'' ','\IU Oi > ,-_~-r .•:: 1· '\ J: 0!00 9\7 ~; ! )'~ .. J 1 ! (J 'r' ~) (;---: 1 1'• : C.:: ( -~ e e e 10 e t.o MON BIJOU ESTATE, ST.CROIX,U.S.V.I. GEO CIM PROJECT NO.: 223-83 BORING NO. : CB-VIM-2 Sample 2,3,4,5, W% = 4.2-14.0 LL = 26.6% PL = 12.3% PI = 14.3 Date: 12-15-83 Sample 10,11,12 W% = 12.0-13.7 LL = 32.5% PL = 8.9% PI = 23.6 e Diameter, mm o.J LUIS 0. GARCIA & ASSOCIATES GEO CIM, INC. Geotechnical Engineering Consultants P.O. ·sox 447 • HATO REV, ·P.R 00919 TELEPHONE 809- 763-1065 GRAIN SIZE DISTRIBUTION-COMBINED SIEVE & HYD?,Qt1f;.lf:F,AfM~YSIS e o.oo)' ;--;-, ? I 10 1.0 Diameter,~m . .I 0.01 0. 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Hi HI+ +H :',t;f :+fttttll :I ill II .1:11 I '1, I 11+1 R l GeotechnicaJ Engineering Consultants J;lillJ '''''"'1 '1' 1·' 11 ' ill I' t·w IIt-i PO BOX447 HATOREY PR 0 9 m 1ttn HJ- 1:1 '"' 11 1 11 ~~ 1 I~IL!Lli 1111 ITt.L . . • ... o 91 I 1TIT I .,_,fiT,, 1'.111'!. ~~_IT 1 1il 1 1 11 'lm' 1 'l.l 1 . 1 i,_J.J-l- TELEPHONEB09-763-1065 1 I I !.l·li ili111D IITH•'JII1!J 'ii !.G. ,, fT!TT II I I I II I ' :'~·;ii:TJTTitiil 'ill'l!~lrtt~t[I:IWJ•i~ll·ttlt,illtij~~~lllllllt.i!R!'IIIJ!I>1!JIIIJII!III'B~IIJ!I-IIJII!I•-IP.I!il----~ J ~JJ"-JJ .. J N jJJJJJ J..! j - Ill I I I I 0 <::'"· c:o ....... ~ IJ'1 -.r ('I') _I GRAIN SIZE DISTRIBUTION - cm'IBINED SIEVE & f1XDROf~PJJL~J1ALYSIS '\ ·< r '·')CoW ~:~/~'~(~ ~·~\-~)~~~-,.~··:.,~~~ ~ ~·}:.~1 O!C'9 9~ e e e (,() $:) ~ e 1.0 e e o.\ Diameter,mm 0,01 O.Do u 1+-t+H~·"'I'+iW ' ' j !;lliJ'IIillJHUJj~ I j uioo· I .. ill! !M+lrn·' umxl '~1+4ff+HHH''' 1+HlH+H-I+H+++++-H +HJill!:"J4liJ1Mittt stlif!J•Jii ~1.1: II ll I I . ~l· 1! 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INC. 1 p~ :_tiT 1111 4g llfl l l lit' 1[)1 ;1, IL!.I I G h · I E · · C I 1 r 1 1 1 fl ·It Jttf1 '"'tm' , 11 1 :f; •m 1 n !;! 1 . 1 - eotec mea ngmeenng onsu tants LLl lilT _1_ r_· - = '::~ il; t;f·' T IT !Uf ~~; :~1 rJi, ;til -Jltti - P 0. BOX 447 • HATO REY, P.R. 00919 UL 1111 il~ lllil'i. lll~llllil, .. i ilf'Uit lJ I l$ ffi r1+rmll[[ Hf={·':~u;IPJ:L U[fW~'l"~IJIHJU!UniTIL(l ILl. TELEPHONE 809-763-1065 rT I I i[ii'l• i'''·ITl'll':'·'' pii!IU-I!liTrf I I - 1 t fTJ - ,, 'i' ,;;; ;,,, 1111 ,_,; 111· Tf;i ttl 11 r r 1 i II I I I IJJJ J J J ..! .J - O)QOI""..<.OU"l ...:- C"l N .-. 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GEO CIM PROJECT NO. : 223-83 BORING NO. : CB-VIM-11 Sample 7,8 Sample 15,16 W% = 16.1 W% = Not taken LL = 59.5% LL = 44.5 PL = 34.5% PL = 23.15 PI = 25 PI = 21.3 Date: 12-22-83 ~II II ,-,-l--1 0 C"l C()"' 1.0 IJ") -.:t "' N IJJJJJ J J - ' 111111111 I!IIJlll rrmrr lJlWJJ 111111111111 I I l'l!II"IIIIII'II'II'III:Jilllllllillllllu..!H+IUJU-++J-JI TTTTTTTTTT"TT~"'IT;rr,,rrlrt:tr~TTI t lTl~l, 1 _ "!IIIII II II l ' I.:Jlj:li'l llililllllllil. IJIIiii'IIJJIIIIJWil'-t' l iJlli TTTfj-;---;----r---r-r-JT·TJ,rr ..• 1-:-:--t-rtLl~j ~1iTiTT1Ti7lilTi1ttrn r ~- (a: c:,: ~ u:) ~ .,e. f" 0 " LUIS 0. GARCIA & ASSOCIATES GEO CIM, INC. Geotechnical Engineering Consultants P 0. BOX 447 • HATO REV, P.R. 00919 TELEPHONE 809- 763-1065 !) }J J .,! .) J J GRAIN SIZE DISTRIBUTION-COI~BINED SIEVE & HYD~O~Jf,TfB.h~li.~YSIS ·y -~ f: t.'! 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II : II :1 1+!--l-l I I I I I I I ! --+-l.f!-+!-iJ.g BORING NO. : CB-VIM-12 Sample 4,5 W% = 17.9-19.2 LL = 39.8% PL = 25% PI = 14.8 Date: 12-21-83 Sample 10,11 W% = 10.3-20.6 LL "' 69% PL = 23.35% PI = 46.7 ffiTl_I __ T_r __ l ______ TJJJ JJ ·J--J OCJ'lCO,...._I.Cit"' '11:1' ('f) N - .J :1' ~Ill Ill! lit il: II I ill I ill! I 11 I It I In '''I ,rn jitj Ht1 I i!U! ill I Ill n 'il if I'!!: ill II u ~!. 'I till I 1Hl' i Ill II I ~ '* Ul I+H '11 1 II 4~ Jl!l I I I II IU I m~ dill I till II :I I II II ,,~,;!! Ill I I :II I I rlillilii ftti+H.l Ht ~,; i : II I I :11 I jif I_L!! I[ Ill I HiT.).+ d :1 Bf .u m l11l , l:·,lilll['!lll'illtllt lit: W' I ' I I I . . . I Cl a.; ,..... tD "' ... ... N GRAIN SIZE DISTRIBUTION-COMBINED SIEVE & HYDRQMU~~,./N'!~,\-,~SIS LUIS 0. GARCIA & ASSOCIATES GEO CIM, INC. Geotechnical Engineering Consultants P.O. BOX 447 • HATO REV. 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CB-VIM-13 II , Plllll ::1[ II"_,,~~~~· I !jl I + l_(ijlili, liW lml ±I .L 1!11 Ill I I miT 111 1 l"' l+!j L 1 I IIIIi I mn l H ·t Sampl 4 5 Sample 12 13 '111.11.'1! Jll l t !i!lilrl ilil I~ - I ll 1 iil •I' I I I II I _ e , _ ' 111! 1' I I I Ill ;Tii I I rm I ~ l -W-%~==- 8.3-10.6 W% == not taken 1H ± ~~.~'li:~~; 1 i' 1 , ~[u:::::.:~:\:,~ 1 11 11 1 u LUIS 0. GARCIA & ASSOCIATES [ lijififf' 1 n ~~ lrti. Ull rrr 1 Ill GEO CIM INC u == 34.4% LL == 87% ~r.wn. IFlim I'[[ , ,I!;!IU' 11 1t1t . - PL == 12.3% PL == 24.8% Hti+. ++ 1Wfl!iidt! 111 if 1 ::: ~H: ttffiH lf~l 1 Geotechnical Engineering Consultants PI== 22.1 PI== 62.2 [I tittLtH_,~ :'MffiffH·:_m_lf~ff~H.l.~!n~l.)fif1,llii~L+.L 1 PO.BOX447•HATOREY,P.R00919 I Date· 12 21 83 . tftl 1 t+ tt .Uifi!' 'U'~\ttrr\if~ 1'''\\\i' il 1f LjH tl[ Uti TELEPHONE 809- 763-~065 hIll I I .I -~ - IJJ J J J J J 'JriHrr1+~~~:'~'J'1''~:i d~i - IJJ J J J J J J " GRAIN SIZE DISTRIBUTION-COMRINED SIEVE & HYDROME1ER,ANA~YSIS ·v ~ n , , 1 1, • <::. • · '," 1 r1 ') 1 ·< <:; r, 1. , •• ~ \\ 11 e e e e e e \D 1.0 o.l Diameter, mm o.ool 0.01 ;o , ._;JU!i ]IU _!lJl u~ 41 , 111 , J 1: 1 II ,.1, , J 1: I ::_., !i! , ml! jJ ~, 1 ,, Un'' ,_IHJi:! Jl .WJJ +l++ ,_~~, ~_,,, _I!If II illl :1 , IIIIi I I II . I I ± !.- (]) s:: •r- 4- +-> s:: (]) u !.- (]) 0... 1!;;1~'+4i111lll ~~ ill' I I :! 1 i l :!jli!f' 1 'il L~!Jlillllll IIIII l'iJlllTI:il,- lllliilli,lll JillH+H+++-11-H-+-+ ",:D! iJ]I !fli II ,,,J J . :I: I , , I 1:1)!1:, . , . ,,: -~~~~-;, ,, I m-- ~~ :rr;IHti lilil I l!Jl , ~;:dli]ill 'll! lj I •!I i i II I J' I I :n;'!i1:1 iill! I "':IlL. ( 1 :iTIIWi.llll :!II TiiJIIIlJ .! o ,,,~jii 1111 II II 1:11 1111 1! I I I 1 111 il !ill II i I ':II :p II IIIIi I II ':iii''! 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[!!1!1, i i' ·,,'1 I I I G EO c I M pROJECT NO • : 2 2 3-83 ; i ; II i Uili llttt++ftltttll' I!Hi, lltlttl1ltltttH+t+HI +++++++++H- BORING No . CB VIM 14 ill I. I I I I I 'Ill ! II • • - - 1 I ; I I I I I I I I 'I! !II +HtH+l-lt'tltll!+m+tttH+!+t+t+I-I+H+~+f-H-++- 1, I I' I I, 11 1 hili Sample 4,5,6 Sample 9, 10 :,: I I :1 m ::IJUIIIIIJJIII .. 1 • I _jill W% = 9.7-15.3 W% = 16.3-17.4 I ·:i::l,il 1 1, ': 1 :,: 1: II II: I: I LUIS 0. GARCIA & ASSOCIATES LL = 46.6% LL = 40% ::'': ,, 1 1 1 GEO CIM, INC. PL = 21% PL = 21.75% lll:ill!l II I :II I . ' ' _ _ •'!I 'II , '' ''II: 11 1 1 1 Geotechmcal Engmeenng Consultants PI - 25.6 PI - 18.3 !'''"'' liil ltllll! I I I PO BOX447•HATOREY PR 00919 Date· 12-22-83 "' "'' '1 ,. ' 1 ' · · ••. • :It 111! II I 'i I ' I I TELEPHONE 809. 763-1065 ;·ilulllll I I I I II r-IT II I I -~-- I -IJJJJ-J]--] ~ _}'jii~IIJ IJH'I~II II~ II~ ' jJ~IJ J J .) J .J omoo ...... w Lrl • rn ro.~ - GRAIN SIZE DISTRIBUTION-COMBINED SIEVE & HYD~Q~If~,£~A~YSIS 't''! 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PL = 23.8% PL = 25% I, tlJlllJjf Ht' ; :rth~ ;:,, ~~ ~~ 1 I 1 1 Geotechnical Engineering Consultants pI = 18 1 pI = 27 I I I -1111 1''' 1111 I I l 1111 'IIIIi!! IILL p 0 BOX 447 ° HATO REV p R 00919 • j --~;1' I l!ltil;j:l•ill[! t' .l . . ' .. Date: 12-22-83 + +r+ T .J\Jw:::~illli ''ifr':~i[[#f: 1 rf. t TELEPHONE 809-763-1065 rr r II ,~r-- ,. 1~-~~-~mrrr~n J I -r i"J''j~lllj~H"'i'l:lli;'[j rn ~~rt JJJ J J J J .J .J - 0 GRAIN SIZE DISTRIBUTION-COMBINED SIEVE & HYQ8QtlE.H~u~.MLYSIS .,v·s·n N!l'i· .. , sr~~.~.~.~~,(; .~;,_;_ · ,-1 .H.-~~ ~- ·J,:\'.11 e e e ~ Q) c ;;::: +' c Q) u ~ Q) 0... e e 10 1.0 0 _1 Diameter, mm 0,01 IOJ~lli'W ~~.1 ,'" ' I 'i''!J\j ~h il!' I Ull j ,;:1 :+~ :1 llitl ~~ l u :+ f, c.i: I I J JLI;ttJ '"I ill! ~ooH HI .~ T; ~-'1 I :i!J I I ib.; u . ''~ II¥ I J' I TI.I I J I J ,j; :' I ' ~ 11 il 'Jq:J I I ' 1 iJU ' ' ,II !111'111 I 1·111 I .1 J ,,. [W'W I t ;'I! li: i !ji ffif I I ~~~~. 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I I II I ill •1[1 1 I I ~'I sample 3 4 samples 9 ~~~~~~~.~~~·'w-~~~~·~·m'·~~~~~~~~~,~~''iJ~·~'-i',-~-~i'~~~~u~.,~''~-tu~u~-;,;;;:~~~-H _ ' - ' +-1 "ill 1 !I !1\ W% = 14.7-17 W% = 9-11.6 I :::::I I : I·:! :II I I I , 1 I LUIS 0. GARCIA & ASSOCIATES LL = 76% LL = 45% ::::':I I I I I j . 11 GEO CIM, INC. PL = 26 9% PL = 27 5% I "!'!I ! i .1!1' II I if . . . • o • 1 1 1 -~ '111111 11 1 ·11. 1 1 . 1 ,, 1 Geotechmcal Eng~neenng·Consultants PI = 49.1 PI = 17.5 ~-~- "1!111 !illiH.i.l ill' ,:jj)jiljl II' I I II I PO BOX 447. HATO REV PR 00919 I 1Jl i'llllJI illliiill W!Jlill' I IIJ I i · · • · · Date: 12-22-83 4m ::::~~: ,1 ~ 11 ,1 1 :;n:!'~ 1 lJJ il 11 TELEPHONE 809- 763-1065 I i Itt+, . ,,, c1 ;1hHWt\i+ ctn~ IB1 I II I I r-I r r 1 ~--~- ,- 1 ---- -- rJ TJJ -r T-J N _"'., " J J .. .., N J ~ J J J J J J j oce.ocr--lPI.I1 oo:!> n"l N - e GRAIN SIZE DISTRIBUTION-COMBINED SIEVE & HYQ~QfiU!_:!L~~~LYSIS e ~ . ~ (1 " ' ~ C''ll'i ,, ',-.,n C\+o- s•Jot<:t/'10 or Y ':"Ti:-}.""'\ \! 7 -·,q • ~..I I P'\'r)i---. 'l•;':l'":"" e e e e 10 1.0 D.\ Diameter.mm o.co; 0,01 l~o ! I IIIIi I i : lilllli: 1· j I 111111 1!11111 II I I I I : ii !Jill l.Wi ill j.liji!ljj I J 1 WJ ::L.' ;~.: IIJJ Jl~ J ll;jj~~ll~jlj)lti .ml U!ilill!lilll II! J·nll~ I 11\: 11111111 , ,, ,:,, '-tu~ UJl m'l .;!jl:iill)li _ UJJ ii J:.: 1JI u· IJJ:Jiill Ill ill' 1 tttH-t+t-tTH- '"'Uililll!lU _ ·!II ,,, • , 1111111 . 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I I I I '~.;1*1 Hifj '. ,', , " ~ i 1 ,':'"m '" ':': ,',, :.i',.. 1 ,,, :;:':tt :.m.!tt1itttttttm11ttt1 H+1 ttitt1 rti1tttt1 tt 11 tttl-t+ttJ ++t-ti-rt-t- '111il Ill ' I II' Ill! lll1 I I 1•11•1 I Jl\'d'lll !II I 11 I 11\1 II I ; :Jill 1 I :11:!11 II!' 11' II Ill ' I I II\ ! I I ! ''il' I ''I II I I: i. I I' II II 11111. lij)1 I '' 11 1 JIJ:t , 'I ill !, ,II ;II II ill\ II II 'liiil\ I I I .,,, "·, , I , I I I I ~~~~' 'Ui 1 +l{ttmmm1t~~tt1'm!lrnlm'mill' rm~III®JJ~~~1~~+ttttt :·I n Ill I I I IIIII! I IIIII ffil' I II tf I 1'1' I t:", ·' lli1 j I - II 11f1TI :1 !'!ill I I i! 'IT I ' : I ! I i J I 1,1 i iU I I I II ) I Iilii I ,, I ' . ! I! II!: Ill 11 ,,. I I I II 'IIi.;!, Hi; ititittH+tt;tHII IHttttttftHttl:tt-HrtHttt+t-t+t+l- s.... Ill c ·..- 4- +' c Ill u s.... Ill 0.. ll !11 ! I I I! I ill II I ll:lij :II' 111'11 i I II I I ~ Tij'il jJ 11: i.lffi '' 11 I 1 . 1 I j I I 'I '. . ' HI' nmmT '.I ; j ] . } ' !Iii I ' :' I ! I I I I' I Hljtttl+ • !II :1 lttttTHiitttHp I ) ~.'!' :I ffii I i I I I :: . • I I I I i I , , ill I I Ill •11 i I T I I U . 11 I i ' : ' 'I I il II I I I 'i I I I II 1!U!fttfttttttfttfh'I!JitJttftttH+itttfttti!tH+t-/--H+t+ ;-ol 'I I 1 1 !'Iiiii I 1111 ''1\f!" •!' I ~ I . I li I I Ill I Ht+ttlti I ' : '.'J I • . 11 '" I ':1 I -l ' I I t I ' . I Wlllil . :I ·II: ' I ,li ! !II 'I! I I I , , rn I I :1 I I I , I I II I 11,1 ' I! I I I !11' I I . I , i :i]j!l~1 ttlttH'!iiffi-ftft1 i~HfltttHtttttti+tt++ttt, +i-lrl-++tH-- 1 1J I I '!'Ill I I :Iii !I I I I J 'Iii I . i I I I 'I I,, i ! , : I I I tP j il I I j ! , Jj . i"' :~I I i ' 1 I_ ! II '1 11 : I I ! 'ill I f+HitHlll tttlf: 1~H+Htttti+tttlt+iH-t-l+ ! 1 i1 I ! j It II r-: li i i I [ 1 ·'I 1 I ili,t' iJ I• 4:> II I I 1:~·~. I II: ::,ll:lll 'I 0 ~ 1.0 I I ! I I I ,I! !ill I I :,; I . I I 1 '' •!! I I I I I I 1!1 I I I Jl .,. I' I I I. I :J 'II' II '!'It I I , I I II ! •1!1 I!'•! 1 i 'II 1 1 I " I I ,1 I I I:JJI< I( I il I I " ·'' tl > I< I I 1 I I I ! I Iiiii . 1 I ''I !<il' Ill ' .1 1 I' I ' II I I i I' iiliil I I I I • ''II I 1\ I I ! I ! I I I Rilil I 'I I I il II I i i;J I I 1:11 I I II I II I ! :I liJ: ,' I :::. 2li!Jl1 : I I I i I I I I ;:,, I Ill .f ! I I I I I ~ 'I I ll I I . '!I i I I I :: I I ! I MON BIJOU ESTATE, ST. CROIX,U.S.V.I. I :,·i I ill' 1,::; I I I GEo ciM PRoJEcT No. = 223-83 I ;,:.;, I ~m I • , ,:,: :" I ', ,' " , BORING NO. CB-VIM-18 t ! u I I Ill II I 'IIi I I I I i I •!II ! ' sample 4 s 6 sample 11 12 ~u~~th~~Mi~.~mm~~mmmN'~~ ®m~muUU~~~----~~~~~~~-· 1 ~'·'J•-•·.- 1 •-~~~r._~~~_.~ ~ , , _ , -H H1t W!mtllllll W% = 9-13.8 W% = 31.3-33.1 I I I •j:~lilii:': 11!,:": 11 1 1 1 i LUISO.GARCIA&ASSOCIATES LL = 31% LL = 54% ;<~·,;: :' 1 1 GEO CIM, INC. PL = 14.85% PL = 23.5% 1 ' 11 :1, 1 1 '1;:; 1 1t 1 1 Geotechnical Engineering Consultants PI = 16.15 PI = 30.5 1 11:,::,: : 1 1 :;:' 1;1 1 1 1 P.O. BOX 447 • HATO REV, P.R. 00919 Date: 12-2-83 r:w:1:. 1 1 1 ') 11r 1 ±t TELEPHONE809-763·1065 I il: :d i , II I ·i:l 1\ I I II IIIII II I IJJJJJ J J J _JJ .. JJ J., .. JJal~JJ J ~ .J GRAIN SIZE DISTRIBUTION-COt,1BINED SIEVE & HYQR,Q~~JJ~.~LYSIS ''t'"!."t'11>1?CI'" <:N01rll'dOOLXO::?T)J.J1' 7 1 .11 e e e 73,800 73,600 ;:: ... ... .!: :l !C ! 0 0 u ' ,.. 1,072,000 B~ APPROX. LEVEE LOCATION 1,072,400 1,072,800 1,073,200 CB-VIM-1 CB-VIM-3 CB-VIM-6 ' \ APPROX. cl CB-VIM-11 CB-VIM-B 1,073,600 1,074,000 1,074,400 I ,074,800 1,07S,200 1,07S,600 \ CB-VIM-8 \ \ BOTTOM OF PROPOSED ' CHANNEL~' CB-VIM-11 X - COORDINATES (FEET) PLAN SCALE: 1• • 200' APPROX. NATURAL GROUND 2400 2800 3200 HORIZONTAL DISTANCE (FEET) PROFILE SCALE: VERT. I' •10' HORIZ. 1••200' CB-VIM-16 CB-VIM-17 1,076,000 1,076,400 1,076,800 1,077,200 CB-VIM-15 1,077,800 ..b£.!illiQ. rnu:nmTI ~ ~ POORLY-GRADED SANDS, GRAVELLY SANDS, LITTLE OR NO FINES (SP) CLAYEY SANDS, SAND-CLAY MIXTURES (SC) INORGANIC CLAYS OF HIGH PLASTICITY FAT CLAYS (CHI t/~ CLAYEY GRAVELS, GRAVEL-SAND- V.h ~ ' CLAY MIXTURE (GC) uwmm !IIIJIJIJI:I:Itl:l ~ mmmm [ffi]JIIITI SILTY GRAVELS,GRAVEL-SAND- SILT MIXTURE (GMI Sl LTY SANDS, SAND- SILT MIXTURES (Sill INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELLY CLAYS,SANDY CLAYS;SILTY CLAYS, LEAN CLAYS (CL) ORGANIC CLAYS OF MEDEUM TO HIGH PLASTICITY ORGANIC SOILS (OH) INORGANIC SILTS, MICACEOUS OR DIATOMACEOUS FINE SANDY OR SILTY SOILS, ELASTIC SILTS (IIH) ORGANIC SILTS AND ORGANIC SILTY CLAYS INORGANIC SILTS AND VERY FINE SANDS, ~~L~~~~Rsr~~~y ~~HC~~T:,~ ~~~~f~ (IlL) CB-PRC·7-BORING NO ~ ~ ~~ BLOW COUNT ...g..~ (STD PENETRATION) (GROUND WAT:R ELEV WHEN BORING DRILLED ~ I. FOR BORING LOCATION PLAN, SEE PLATE B- 4. .2. FOR DETAILED SOIL DESCRIPTION, SEE BORING LOGS. 3. FOR SECTIONS A-A,B-8 AND C-C ,SEE PLATES B-SI, B-S2 AND B-S3. SECTION 205 DE TAl LED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX B PLAN- SOIL PROFILE DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE, FLORIDA D.O. FILl; NO.I09-34,414 PLATE B-50 .. I Slice HT(rt) ;;-.. We,qhl(kip'!_ ... ... .. ' 10 '·~-"" ') @G' 2 ~ ~ ;:) w. E ~ ~ 'll ... ~ 'l: -2 .I.> t~ ~ ~ :f5:. ..;: l "' t .z.~ ~ ~ ~ ~ ~ 'll'lJ ~ ~I"' ~ 2 ~ z / .fJ .~ ~ t ~\) ~t ~8 ; II) ~ ~ ~ ~ -. \,"" 'C "" .... .-:: ~ " ..,~ ' '~ '"{ ...... ~ "' 1-.: ~ ~ ~ ~ ~ ~':; "' ~ >..: ~ 1/ j ~ ~ ~ ~ ~ '< .J ~ .... "'= ""' ""' " II) 4 ~ I (J) I 1.5 0 J 1.5 Z.J .J - .J 2.5 2.5 ./0 -1.4 0 ~ "' I~ 2 3.8 3 4.5 J.8 14.3 1.(0 - 2.5 IJ E .f-·5 2' J./J J.IJ 1.9 7.2 .9 .. 0 0 7.3 .3 "' 0 "' (J) 3 ti.4 4.5 4.~ 4.5 26.1 J.J - IJ 0 ¢Ds ~ o I 2 J I z 3 ® ,. ~.~ J.IJ J.IJ 3.8 24.J 2.9 ti.J In e ® ,. ti.-1 0 .. 3 19.2 2.1 - {5.8 22 -/.9 0 ·" 1._ (J) 4 J.5 1.5 4.5 H /5.8 1.6 - "' .. 'j @G, q, (J)CL ® 4" J.S 3.8 J.8 J.8 ''·' '·" - -<:: ~.$ \{) ® 4' J.S .. ~ (i 21 2.J. 5 @ ., .. J.5 0 2.5 /.j 4.(i .(0 - 4.5 0 0 7.5 -~ 4 IVs cp 5 11.5 4.5 0 2.3 2!..S J - '/ ® 5' 11.5 }.8 J.6 J.8 4J.7 !J.2 ¢ =0• C• ?.5 Ksf 22./J ® 5" 1/.5 10 .. .. "' 7.fi> • c ,o @ 5. 1/.5 2.5 7.2 -1.9 55.8 7 - IJ. 0 0 7.5 2.3 z I ~~' ® ,. 145 J.S 0 /.9 27.~ J.J - r Als FD5 ® ,. 145 (i " .. 87 9.10 - 2'-9 ~ @ ... 1~5 7.2 .!.' 7./0 112.4 '" - 15 0 0 7.5 3 0 0 FH ;,- ~ 7"" 5.4 .. i.-1 5.2 2/J J./ z 4 .. I z 3 - 8.4 7" 5.4 6.3 7.5 7.9 -12.7 5.3 5.4 0 0 7.5 .8 Normal 5/ress (K5f) ~ 6" /~. 2 4.4 4.4 4.-/ 7/.J 7-8 - tr /ti.2 r.s 0 J./J "'·" 7.7 15.5 !8.5 0 0 7.5 '·" @ 9"' 5 4.-# 0 2.2 II /.2 - /.2 7 17.5 J.9 0 0 1/1 f.S. = J.51 .; 1ft EQ. Coeff. • 0.1 G e ~ Assumed Des1qn Data(Q Slrenglhs)"' I MTL. Uhil WI. (Pel') ¢ c f'.S.•S.O!J 1'".5.•5.47 NO. MTL. 1/rl I SAr OEG. 1<51'. r------b- 200 l~Vee +, +, £4·5~ j ., 0 115 120 20 I R•43 R•43 rtu 'l#.tl" ~~E5·10 ® GC 120 125 !13 0 F. s.' 4.51 7. 0 7 GL /10 115 0 2.5 Co5~ Noles: 0 GC 125 /30 34 0 FS·4.74 FS. • 4,g/ f>os /. Slope Sfabilily Analysts Perlor~t~~t! 1!)0 Iff ~s~d on ~ld Penefral1on Tests. /4.;' . ~~· Ns Fos Usmq Ufexas 2 (Spenc~r Method) ~3 Co~npuf~r Pro1rtzm. 'lanous Arc FORCES ON TYPICAL SPLICE and- JV~dqe ra.ilvre !;urfacr p: N. T.S. Locaf1on.s JV~,., Trted lflf/1 fatlure 8 Surface ~/lawn Thai Producrd LOVJl!sf F. s. /80 2. Boring C/J- VIM-/ U3ed for Soil (Levee Sedion ln(ormaff(m. 3 For 5eclion LoccdJon, See ~ 2.5 Plate B·5o. 2 3 4 5~ 9 (f) ®ac\ - ~ 170 .{ 4' s· ?_- Exca'faled ChannelL COMPOSITE FQRCE POLYGON ~ F.S. • 4.51 lL' SCALE:• 5 KIPS (J)cL 4" s" ... 7" s· 1100 ~~ / (/) CiC ~ . 7"' SECTION 205 DETAILED PROJECT REPORT ISO ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX B SLOPE STABILITY - LEVEE /-1() END OF CONSTRUCTION ·40 -30 -20 ·10 0 /0 20 30 40 50 1#0 70 e HORIZONTAL SCALE -FEET DEPARTMENT OF THE ARMY SECTION A- A JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE, "FLORIDA · D.O. FILE NO. 109-34,414 PLATE B-51 e e I :E - f- "' "' "- ' "' "' ..J "' e ~ SLICE HT (!'T) .. WEIGHT {KtP5) ~-;:: ~ "'~ ~ " ~ i): ... ~ ~~ " ... ~ ~ "' I!) Yl ~ ~ ~ ""'' ~ .... ~ Q 't ~ ~ " ~ "" "' <I( 0 ~ I'! ~~ " "' ..: .... ~ ~ 0\Vl ~ ~ _, "' 't ~ '::i ~ " "' I® I .r..s 0 3 1.5 !').6 1./ - I .I 8 0 ~ 'l Cd 3 .8 '·' /Z.3 /.4 - 2' t;.5 0 .3 1.5 5.8 1.1 - 7.~ 7.5 2.5 0 3 '·' .e 0 .4 ?.r; .3 - ® 3' r;.s 3 /.{, 7.3 14.~ /.C. - 7.5 10 3" r...~ 0 /.5 .e 4.8 .r; - '·' 0 ~ 4' 5 /.8 0 .!1 4.5 .s - /.G 4" 5 I. 8 '1 '·' ,,, /.I - 5 0 0 s· 5 '2 0 I 5 .c. - .cr. 5 0 I! F5.' 2.'2 - 111 £Q. COEt=F • 0. I zoo I ASSUMED Dlf5tGN OATA {Q STRENGTHS) MTL. MTL. 111·//T WT. (PCF) ~ '~! NO. lfm II SAT OE6 (!) CL 1'25 130 0 ® sc liS 120 34 @ ML 110 115 zo 0 sc 115 120 35 180 + ® C# 130 135 0 ¥ 6a•~a on Std PMt:frof,on te$f.5 I /70 I (!)a @sc /t;O I @ML @) sc -- @)cH I 150 /40 * ~ : I ~ ~ ~~ ~ )In' I "I ~ oc~l ~~ '-I~ ~~I ..J ~ ~ I 0 /l.(i .I .8 ,.8 .!J 0 12 .3 0 12 .2 0 12 .!, 1/f c K~F z 0 .3 0 2.5 ";~ ~ 3 (!)CL ,=a•. C =.2K5F -;;: II\ .:S o L---+-----;;-- ~ 0 ~ "' J ~ ~ f\ ? ®ML 3 Dt-----~----~----~ 0 .3 .31 @sc t ~f or- 0 C."' ~· 0~· / 0 I 'l 3 3 T @)sc f ~ 'G ~~ ~. / 0 I 2 3 NORMAL STRESS ( KSF) F. 5. •4.!'/C. + R• (;Z' FS. • 4.04 + R•t;O' F. 5. = 4. 76. + R• c.z' t:~., 7. 40, R = #' F~. : 7:. ~2. R: 35' /'5. = 7.40 FS. • 4. 41, R • 50' + F.S. :c.. ~5, R= !18' FS. • 6..55 1'5. ~ 4. 7(i 3 I ¢ = 0~ C• 2.5 KSF 2-1- ®cH 3 0 0 e , e~~7· 22.1-...J jwz L c~ Ez-!1 /{'02 !It Fot FORCES ON TYP. SLICE N.TS. ~ e XCAVATEO Cif.4N/oltL (__ ~01-----------~-----------+----------~----------~~----------+-----------~----------~----------~----------~------------~----------+---------~ -~0 -20 -!O 0 10 20 30 40 50 t:;O ?t; IJO !!10 HORIZONTAL SCALE - FEET SECTION 8- B A't Co-z COMPOSITE FORCE POLYGON F.S. • 2.!12 SCA££, I' =I KIP tiiOTeS: /. Slop<> sfabtlif'{ anai!J.si.s perf'ormed usin'f //TeXAS 2 (S;:>Mc<:r M<:fl>od) Computer PrOtJrtfm. Vqri()(l$ ore tMd Wt!dt]t! Ta/ltn: !Jtlrrtrct: /ocof/bt?:J w~re fried with foilur~ 5Urft1t:t: shown fhtrf produced low~~~ r. 5. 2. 8oriiiiJ C!J- VIM -(li u5t!"cl f'or sot/ .5ee'lion inrormaf/on. '· t=or $ecf/cn locof/on, se~ Plole II-!70. SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX 8 SLOPE STABILITY- CHANNEL END OF CONSTRUCTION DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT, CORPS OF ENGINEERS JACKSONVILLE', FLORIDA D.O. FILE NO. 109·34,414 PLATE B-52 I e e e ;:: 5UCc fiT {Fr.) "' WE/GilT {KIPS} ~ '\II 1 ~ ~ ~ ';t\;: VI ~ ~~ ~ ~ ~ f" ~ ~ .. -.) ~ ~ ~ "' "' il( ~ td " ~~- ~ ~ <!) -r \(\( h. ~ ~ ~ ~ ~ ~ ~~ ll~ ~~~ ' iil ~'- ~ ~ ... It\ ~ " ~ " ~ " "' ;j ~ "' I' ~ " \l " :§! " ~ ~ ~ ~ tl. <J ~ t co I 13.5 0 18 ~ 121.5 /3.4 - Jj.4 Z2 30.8 tO.! 0 /.!J ffi 2 ~ 18 16 I~ '" 17.8 - 2' 9 0 ~ 4.5 40.5 - z.w 2Q4 /3 2,.4 153 0 z ~ 3 24 18 18 18 432 47.5 - 3' 24 ~ " !I Zit;, - 13.<:; 3' 24 0 17 8.5 204 - 1/.B 7?.'!) 30 '!J <I /3./ 7.3 0 4 30 18 8 13 31M 4?.~ - ® 4' 30 ~ '!J ~ 27 /.7 84" ® 4" 30 17 ?'[} 23 ~~~ - 40 33 9.9 <:;.5 /3.1 8.5 0 5 24 8 0 4 % /0.(; - ® 5' 24 ~ '!J 9 21(; - 13.11 <I'M ® 5' '24 2"J 33 3/ 744 - 43.2 25 7.5 5 /3./ ,;.7 ® <I' 27.5 " 0 4.5 12'. - 7.8 5,.~ 3 ,.. 27.5 33 32 32.5 8'!)]. - 5'1.8 27 8.1 53 !3.1 5.~! 3 7 .. /'!} 31 25 26 532 - !IO,'!J qo.-, 20 <I 4 13./ 3./i 3 8' 20 25 17 21 420 - 24.4 244 2'2 "·" 4.3 /3.1 2,~ 3 ,, 24 17 Cl_..!!c._5 204 - //.8 11.8 2"J 8.1 5.7 /3.1 /.Zj ill' F.S = 1.53 tfJf EQ. COEFF. =O.I 210 /:10 + 170 /50 :1! - 1- "' "' ... I :> ~ /30t 1/0 t I !JO .4551/MEO DESIGN DATA ( Q STRENG77-I) iK MTL MTL UNIT WT ¢ c #0. 'lfm __ 'd__sutJ DEG KSF 0 MH 110 53 0 1.4 ® CL /'20 IP3 0 1.8 ® ML 115 58 20 .3 :¥( Ba~d on 5fd p~nefrafion fesfs \rz-c.' 11:. 0 MH \I I z I 3 I - "'-z I I @ CL 3' - @ ML ~ ~ 31 ~ ~ 'l In " ~ In 0( I '{ ~ It\ 0 4- ~ 4' 4" I 3 31 (DMH @CL @ML ? ¢=0~ C= 1.8 KSF '2 ¢=O~C=/.4KSF 5" I I _.c~ '2 3 0 I '2 3 0 I 1! 3 #ORMAL STReSS (KSF) F. s. = 1.5(; + ,R ~ 121P. 1:5.•152 !?·/?(;;' + F.5. =2!!J7 R =85' FS. =1.58 + R = 12~' F.S =1.53 R= 135' (1- F.S. o /.72 R = 100' ASSI/MEO PflcRATIC 51/RFACe r;,' 7eXCAVATcD CHANNEL~ !!)" 7" 8' m~--------~--------~--------~-------------------r---------+---------+---------+~-------+~----------------~ -t;,O -40 -20 0 20 40 GO 80 /00 !'ZO 140 !GO HORIZONTAL SCALE - FEET SECTION C- C ¢03 .,/;' IW!J ~_r-Co3 I I j~FH!I ~ COMPOSITE FORCE POLYGON F.S. ' I. 53 SCALE, /"• 20Kif'5 NOTES: /. Slope sft:JIHh'f'y analysis pertbrmetf willf VTEXAS :Z (5,-,.:~r Mefhoil) c-~ Program. Var,~ """"' ana' w<N¥9" :wrl'«tt /ocoh'on• .-r~ f'n~ wff'll fltililrt: 511rf,~ ~" fh<lfprrlducttd lowe•f 1":5. · t. Boni?f C8-VIM-11.ullt:ti fiJr ~I,....,.,;,.. in,.,rmlll'rm. 3. !'or secfion location, ~~t! f'laft: 8 -5'0. SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX B SLOPE STABILITY- CHANNEL END OF CONSTRUCTION DEPARTMENT OF THE ARMY JACKSONVILLE DISTRICT,, CORPS OF ENGINEERS.~ JACKSONVILLE, FLORIDA D.O. FILE NO. 109-34,414 PLATE B-53· SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX C RECREATION ASSESSMENT A. RECREATION ASSESSMENT 1. Recreation Assessment. a. T~e structural features to alleviate flooding, as presented in this report, limit recreational opportunity. The possibility exists, however, to upgrade the existing municipal parks within the project boundaries by using suitable material from project construction to re-contour some park areas to alleviate site flooding. Construction of additional facilities such as a restroom, multi-purpose court, playground, etc., with appropriate landscaping could also be considered. Where opportunities for development of recreational facilities do not exist, appropriate treatment of project features would include landscape plantings to minimize visual impacts. b. The opportunity for including these recreation features in the pro- posed project was coordinated with a letter dated May 9, 1984, to the Department of Public Works in St. Thomas. No interest in recreation deve- lopment has been expressed; therefore, recreation planning has been suspended. C-1 SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX D ENGINEERING, DESIGN, AND COST ESTIMATES SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX. U.S. VIRGIN ISLANDS APPENDIX D ENGINEERING. DESIGN. AND COST ESTIMATES A. INTRODUCTION B. DESIGN AND CONSTRUCTION Channel Levee Gabion Control Structure C. REAL, ESTATE REQUIREMENTS D. RELOCATIONS General Bridges Houses Utilities E. OPERATION AND MAINTENANCE F. CONSTRUCTION SCHEDULE TABLE OF CONTENTS G. QUANTITIES AND COST ESTIMATES LIST OF TABLES D-1 Estate Mon Bijou Contract Price - Quantities and Cost Estimates D-i PAGE NO. D-1 D-1 D-1 D-1 D-1 D-2 D-2 D-2 D-2 D-2 D-2 D-2 D-2 D-2 PAGE NO. D-3 APPENDIX D ENGINEERING, DESIGN, AND COST ESTIMATES A. INTRODUCTION 1. General. This appendix presents the discussion of applicable design considerations and construction methods utilized to establish a basis .for the cost estimates. The proposed plan is presented .in the main report and Appendix A - "HYDROLOGY - HYDRAULICS". General requirements for real estate and operation and maintenance are also presented. • B. DESIGN AND CONSTRUCTION 2. Channel. Approximately 6,500 feet of channel would be constructed along the alinement shown on plate 2 in the main report. The channel would be excavated to satisfy the hydraulic design data shown in Table A-5. A portion of the excavated material would be used to construct the proposed levee, and the excess would be hauled to an off-site disposal area or possibly placed alongside the channel. 3. Levee. A levee, approximately 450 feet in length would be constructed along the upstream portion of the proposed project to provide an SPF level of protection. The crown would be 15 feet wide and vary in eleva- tion from 190 feet (msl) at the westerly end to about 175 feet (msl) at the intersection with Highway 73. Side slopes would be lV on 2.5H. A gabion mattress would be placed along the north face of the levee to provide ero- sion protection. The levee alinement is shown on plate 2 in the main report, and a profile is shown on plate A-5. 4. Gabion Control Structures. Thirty-three gabion control structures would be constructed at various intervals along channel alinement to main- tain subcritical velocities and prevent erosion. A plan and section of the proposed gabion control structure is provided on plate 3 in the main report. The geotechnical requirements for construction of the structures are pre- sented in Appendix B - "GEOTECHNICAL AND MATERIALS". 5. Inflow Modifications. The two major inflow points at Station 23+00 and Station 57+00 along the proposed channel would be modified to provide erosion protection. A description of these modifications is provided in Appendix A. The gabion bank protection would extend to one-foot above the inflow design water surface. C. REAL ESTATE REQUIREMENTS 6. Real Estate Requirements. The local sponsor would be required to assume the cost of all land, easements, and rights-of-way, including disposal areas, required for construction maintenance of the project. D-1 D. RELOCATIONS 7. General. The local sponsor would be required to assume the costs for relocations and alterations. These would include highway bridges, streets, houses, buildings, electric transmission lines, util.ities, fences, and other miscellaneous items. 8. Bridges. The proposed project would require the construction of two bridges as shown on plate 2 in the main report. For cost estimating purposes, the bridge slabs would be poured-in-place beam and slab reinforced concrete construction. The bridge at Station 20+60 would be approximately 140 feet in length and provide for two 10-foot lanes. The bridge at Station 60+60 on Canaan Road-would be approximately 150 feet in length and provide for two 12-foot lanes with 3-foot-wide sidewalks. Prior to construction of this bridge, a detour road would have to be constructed to maintain the flow of traffic. Detours to be used during construction of the other bridge would utilize existing roadways. 9. Houses. At least three houses located along the eastern end of the proposed channel alinement would be relocated. 10. Utilities. Topographic surveys would be obtained prior to preparation of contract plans and specifications in order to locate any underground uti- lities, above ground telephone lines, and/or electric transmission lines which would require relocation or alteration in order to construct the improvements presented in this report. Twenty-five thousand dollars has been included in the estimated relocation costs for unknown utilities. E. OPERATION AND MAINTENANCE 11. oeeration and Maintenance. The local sponsor would be responsible for the ma1ntenance of the improvements proposed in this report upon completion of the construction contract. The Contractor would be responsible for all maintenance during the construction contract. F. CONSTRUCTION SCHEDULE 12. Construction Schedule. Following approval of this report and appropriation of funds, contract plans and specifications would be prepared for the proposed plan presented herein. It is anticipated that a construc- tion start would be scheduled for Fiscal Year 1988 or 1989. The estimated construction time would be 12 months. G. QUANTITIES AND COST ESTIMATES 13. Cost Estimates Presented. Quantities and cost estimates for construc- tion of the proposed plan are presented in table D-1. D-2 • TABLE D-1 ESTATE MON BIJOU - ST. CROIX, VIRGIN ISLANDS QUANTITIES AND COST ESTIMATES (Date of Estimate: July 1987) Cost Account Number Item Unit Quantity 09 11 30 31 CONSTRUCTION COST Mobilization/Demobilization Excavation Levee Construction Clearing and Grubbing Grassing Gabion Control Structures Inlet Modifications Building Removal Subtotal Contingencies (20%+) Contract Price - Engineering and Design Supervision and Administration CONSTRUCTION COST Job C.Y. C.Y. Acre Acre C.Y. Job Job 1 285,000 1,500 25 10 8,500 1 3 LANDS AND RELOCATIONS 01 Lands and Damages Rights-of-Way and Easements Residential Acquisition PL 91-646 Administrative Costs (10%+) Subtota 1 Contingencies (15%+) Lands and Damages - 02 Relocations Bridges Utilities Subtotal Contingencies (20%+) Relocations - LANDS AND RELOCATIONS TOTAL FIRST COST Interest During Construction @ 8 5/8% - 12 months TOTAL INVESTMENT COST ANNUAL COST Interest and Amortization @ 8 5/8 - 50 years Maintenance ANNUAL COST D-3 • Unit Price L.S. 2.50 1.25 $1500.00 $1500.00 $ 90.00 L.S. $2000.00 Total $ 20,000 712,500 1,875 37,500 15,000 765,000 63,500 6,000 $1,621,375 324,27 5 $1,945,650 194,550 155,600 $2,295,800 $ 307,500 150,000 31,500 47,500 $ 536,500 80,500 $ 617,000 $ 605,000 25,000 $ 630,000 125,000 755,000 $1,372,000 $3,667,800 150,000 $3,817,800 $ 334,600 3,400 $ 338,000 SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX E ECONOMIC ANALYSIS • SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOO A. ECONOMIC SECTION Introduction General Background ST. CROIX, U.s. VIRGIN ISLANDS APPENDIX E ECONOMIC ANALYSIS TABLE OF CONTENTS Existing Without Project Flood Damages Future Without Project Flood Damages With Project Damages Summary of Average Annual Benefits LIST OF TABLES E-1 Population & Projections - U.S. Virgin Islands E-2 Employment by Industrial Group for Virgin Islands Territories 1982 E-3 Summary of Without Project Damages E-4 Summary of Without and With Project (Bypass Plan) Damages E-5 Estimated Number and Value of Structures and Land to be Purchased E-6 Summary of Without and With Project Damages E-7 Summary of Average Annual Equivalent Benefits E-i PAGE NO. E-1 E-1 E-4 E-6 E-6 E-8 PAGE NO. E-3 E-4 E-5 E-6 E-7 E-8 E-8 A. ECONOMIC SECTION 1. Introduction. The purpose of this section is to evaluate the effects of the modifications which are proposed to be made to the drainage conditions presently existing in the study area. a. The economic aspects of the study were to: (1) specifically determine the extent and location of present land use and resource development in the area, (2) suggest a pattern for future land utilization in the area, (3) analyze the effects on the economic activity in the area caused by the proposed modifications to the existing drainage conditions, and, (4) compare the economic trade-offs between the alternative plans proposed. b. The general assumptions in this study are limited to the following: (1) during the study period, there will be no major economic recessions which will seriously affect the long term growth pattern of the national economy, and, (2) the international political tensions will remain at approximately the present level and there will be no widespread outbreak or hostilities. 2. General Backlround. The study area is located on the Island of St. Croix whichs a part of the U.S. Virgin Islands Territories. This territory is made up of three inhabited islands. Although under one govern- ment, each island has it owns distinct characteristics. The territories' history has been guided largely by events controlled by outside forces. Originally discovered by Columbus, its most important early developments were provided by Denmark. The United States gained control of the islands in 1917. Original commercial interest was centered in agricultural produc- tion, i.e., sugarcane, and as a transcontinental shipping station. These activities declined in importance in the latter part of the 1800's and the early part of the 1900's with a devastating effect upon the economy of the islands. Between 1835 and 1930 the population decreased by one half. The construction of naval facilities on the islands and a resurgance of sugar- cane activity due to the repeal of Prohibition in the United States resulted in a 20 percent increase in the population between 1930 and 1950. a. Economic activit¥ remained depressed through the 1950's; however, during this period the sugarcane industry was being replaced by a diver- sification of productive activity through expanding tourism and manufac- turing exports. The most dramatic growth in every sector of the economy took place during the 1960 to 1970 period. The population grew from about E-1 32,000 persons in 1960 to about 92,000 in 1'975. Historical population and population projections are shown in table 1. Gross territorial product grew at 10 percent per year as the tourist, manufacturing, construction, and government sectors of the economy expanded. Tourism, the most dominant eco- nomic activity, increased from about 200,000 visitors per year to well over 1,000,000 visitors per year. The employed labor force tripled during this period and the Virgin Islands Gover~t budget rose from 7.1 million dollars a year to 114.1 million doll~~~ per year. The distribution of employment in the territory is shown~ Table 2. Personal income for 1980 reached $622.7 million. By 1982, it had climbed to $705.5 million. Per capita income was $7,078 in 1982. The territorial economy is heavily tourist oriented. Much of the employment and income in the transportation, wholesale and retail trade, hotel, and services sections is derived from the tourist demands. In 1982, the number of visitors by air to the islands was 395,420 and by cruise ship was 464,593. There are other industries. The Hess Oil Company, a petrochemical refinery and The Martin Marietta Bauxite Plant are located on St. Croix. There are 44 industries on St. Thomas - Johns Islands. As stated earlier, this expansion was the result of exoge- nous forces providing the drive for the insular expansion. Included in these external changes were the discovery of the islands as a tourist attraction, large federal subsidies, United States Territorial trade con- cessions, and legislative privileges, and an influx of off-island capital. As with all island economies dependent upon main land prosperity, fluctu- ation in the external econony cause similar results in the insular activity. This was true of the 1970's downturn in the United States economy and the high inflation and interest rates on the main land. b. This extensive growth in population and economic activity resulted in dramatic changes in the residential development pattern in the territory. Past low-density rural residential patterns have been altered to provide the land area necessary to accommodate this large population growth on islands with limited land resources. The average number of persons per square mile was 250 in 1960. In the late 1970's this had increased to 725 persons per square mile. This expansion pressure and change in residential patterns has been especially true for the island of St. Croix. The intensive demand for resources devoted to the tourist segment of the economy has made loca 1 city residential dwelling very expensive. The lack of infrastructural shopping catering to permanent resident needs has also made city dwelling incon- venient. These factors coupled with other social changes has resulted in large expanses of suburban sprawl. The mobility provided by the automobile has made suburban residency and center city employment compatible and vast tracts of agricultural lands and open country have been displaced by urban developments. c. The Estate Mon Bijou and Glynn are examples of the suburban develop- ments resulting from these very recent and dramatic changes in the ·demographic, economic, and social changes which have taken place on the island. Residents in these two communities commute to the hotels, marinas, industries, and center city commercial locations of their employment. E-2 • 1975 1985 St. Thomas Totals 75,15 1990 e TABLE E-1 POPULATION & PROJECTIONS U.S. VIRGIN ISLANDS 1995 2000 2005 e 2010 2015 2020 2025 2030 2035 172,568 ~ * U.S. Virgin Islands growth statistics, Office of Policy, Planning & Research, U.S. Virgin Islands Department of Commerce. I ~ TABLE E-2 EMPLOYMENT BY INDUSTRIAL GROUP FOR VIRGIN ISLANDS TERRITORIES 1982 Industrial Group Number Persons Percent Total Agriculture 3, 777 9.4 Manufacturing 2,700 6.7 • Construction & Mining 3,270 8.2 Transportation and Public Works 2,180 5.4 Wholesale and Retail Trade 7,210 18.0 Finance, Insurance, and Rea 1 Estate 1,530 3.8 Hotel, Etc. 2,700 6.7 Other Services 3,240 8.1 Government 13,500 33.7 Tota 1 s 40,107 100.0 Individual home ownership is typical of these areas. Portions of both Estate Mon Bijou and Glynn are subject to periodic flooding and the segment of these developments subject to this flooding is the portion being examined in this study. 3. Existing Without Project Flood Damages. The study area is composed of two residential subdivisions called Estate Mon Bijou and Glynn. They are urban in nature, but are surrounded by a rural environment. The homes are privately owned and lived in by permanent residences of the island of St. Croix. These subdivisions are situated in the North Central portion of the island of St. Croix in the upstream sector of the Salt River watershed approximately 5 miles West of Christiansted. Estate Mon B~· u is located upstream of Glynn at the confluence of the Canaan Gut and e Little \ \ \ E-4 e ' Fountain Gut. The physical characteristics of the area are represented by steep topography, thin clayey soils with nonporous rock bases and numerous short drainage basins. Flooding is of short duration with high velocities. a. There are over 200 individual residential units in the area which have experienced severe flooding and extensive property losses. Their construction ranges from poor frame to good masonry. Many are built at ground level. They range in size from 500 to 3,000 square feet. All housing units in the Estate Mon Bijou and Glynn are not affected by flooding; however, the majority of units in Estate Mon Bijou would be inun- dated during an SPF condition. b. Maps were prepared for the study area showing the type of existing land use, its location, and an estimate of the value of the land use acti- vity at each location. Flooded area maps were also prepared of the area for the 2, 5, 10, 25, 50, 100 and SPF without project storm frequencies. These flooded area maps describe the stages and frequencies of each of these floods. The information used in calculating the flood damages caused by each of these storms is obtained by interfacing the data on the land use maps and the flood frequency maps. The damages occurring to existing land use (1985) for each of these flood frequencies is shown in the following tabulation. TABLE E-3 SUMMARY OF WITHOUT PROJECT DAMAGES ~) (Existing Land Use) 0! 1986 Price Levels \ nAMA :J:".S ''Fl,.OOD WITHOUT PROJECT CONDITIONS FREQUENCY MUN IHJUU GLYNN I UrAL """- ) 2 [639 990 4,100 344,090 ~,_ 5 629,790 36,230 666,020 10 823,100 74,340 897,440 25 1,108,060 125,580 1,233,640 50 1,318,280 199,400 1,517,680 100 1,504,230 293,370 1,797,600 SPF 2,357,460 931,880 3,289,340 AVERAGE ANNUAL 413,380 28 '770 442,150 I E-5 4. Future Without Project Flood Damages. That portion of the Estate Mon Bijou Subdivision subject to flooding is very densely developed .and there is expected to be no change in the future utilization of the land in this area. The Glynn Subdivision is less thickly settled; however, most of the home sites have been developed in the area and it is concluded that little future change will take place in the area under without project conditions. Therefore, existing and future flood damages will be identical. 5. With Project Damages. Five proposals have been examined as solutions to the flood1ng problems in this area. They consist of the concrete bypass plan, the gabion bypass plan, the earthen bypass with drop structure plan, the non-structural relocation plan and the selected plan. The first three plans are bypass channels around the residential area and provide exactly the same flood protection. The non-structural relocation plan consists of purchasing all structures within the 5-year, the 10-year and the 25-year flood plains and relocating those residences elsewhere. The selected plan consists of a partial channel improvement of the existing channel. The benefits derived from each of these proposals are discussed below. a. With Project Damages for the Bypass Plans. Flooded area maps were prepared of the area for the 25, SO, lOO and SPF frequency storms with pro- ject hydrologic conditions. These maps were interfaced with existing land use maps to obtain the depth of flooding in the residential structures. The structure and content damage was estimated using depth damage curves deve- loped for the area. Additional damage was calculated for autos, lawns and shrubs, roadways and culverts. The results of the analysis are shown in the following tabulation. (' ··, f .--' TABLE E-4 :':A,,) SUMMARY OF WITHOUT AND WITH PROJECT (BYPASS PLAN) DAMAGES (Existing Land Use) 1986 Price Levels DAMA!iES DAMAGES W/0 WITH FLOOD PROJECT PROJECT DAMAGES FREQUENCY CONDITIONS CONDITIONS PREVENTED $ $ $ 2 344,090 0 344,090 . 5 666,020 0 666,020 10 897,440 0 897,440 . 25 1,233,640 242,550 991,090 50 1,517,680 431,970 1,085, 710 100 1,797,600 568,470 1,229,130 SPF 3,289,340 921,480 2,367,860 AVERAGE ANNUAL I 442,150 26 560 415 600 E-6 No future change is anticipated in the land use as a result of providing these plans. Both existing and future damages are the same. The average annual equiv~lent benefits·derived from these three bypass plans are $396,000. b. Non-Structural Relocation Plan. The number of structures required to be purchased in each of the three flood plains is shown in the following tabulation. TABLE E-5 ESTIMATED NUMBER AND VALUE OF STRUCTURES AND LAND TO BE PURCHASED (Existing Land Use) 1986 Price Levels ESTIMATED ESTIMATED FLOOD NO. OF AVERAGE TOTAL FREQUENCY STRUCTURES VALUE COST 58~400 $ 2 29 2 41,500 2,579,180 5 35 58,400 5 41',500 3,270,500 10 41 58,400 6 41,500 4,027,890 25 51 58,400 13 41,500 5,114,080 Flooded area maps were prepared for the areas outside these flood plains and flooding to the remaining structures and contents determined. The average annual damages which would occur to these remaining residences were then computed. Benefits of the Nonstructural Plans. The nonstructural plans being exa- mined consists of purchasing those residential properties located within the 5, 10, and 25-year without project flood plains and relocating the resi- dences elsewhere. Because only that portion of flood losses prevented which are externalized may be claimed as benefits, the average annual damage was computed separately for those structures within the without project flood lines. Those properties falling outside the without project flood line remain subject to inundation damages from flood frequencies greater than the 2, 5, 10, and 25-year frequency floods and those average annual damages have been computed and are noted as residual damages. E-7 r The benefits claimed are computed as the damages to those properties proposed to be removed. Only externalized flood damages are eligible to be claimed as benefits. The externalized flood damages are equal to the total flood damages less the cost of the flood insurance premiums paid by the owner of the insured structure located in the flood plain. ER 1105-2-353 stipulates that flood insurance premiums are a cost borne by the flood plain activity under without project conditions and must be deducted from the without project damages. The flood insurance premium for each activity was computed using the rates and methods specified in the Flood Insurance Manual (NFIP-10/83). The total premium for structure and contents was assumed to be an average annual equivalent since it would be an annual payment. The deductible portion of flood damages is also assumed to be a cost borne by the flood plain activity, and is therefore subtracted from the damages prevented. The $200 deductible for structure and for content dama- ges ($400 total) from each occurrence was converted to an average annual equivalent by application of expected frequency of flooding based upon the elevation of the structure. The overhead associated with administration of the Flood Insurance Program for structures to be removed is $85.00 per policy as prescribed in EC 1104-2-167 for 1987. Because this overhead represents a cost borne by the nation, the reduction of the overhead associated with the relocation of flood plain activities is an NED benefit of the project. The estimated overhead and administration cost associated with the subject properties was added to the damages prevented (less flood insurance premiums and deduc- tibles) in order to arrive at the benefit to relocation of the subject flood plain activities. The average annual equivalent benefits available from each of these three nonstructural plans is shown in the following tabulation (Table E-6). E-8 Plan 2 Year 5 Year 10 Year 25 Year TABLE E-6 BENEFITS FROM NONSTRUCTURAL PLANS ($1,000) Ave Ann Eqvn t-looa Damages w/o Insurance Project Premiums Deductibles 262.6 8.9 6.2 358.0 11.3 7.3 372.3 13.2 9.4 384.4 17.6 12.8 uverneaa and Admin Benefits 2.6 250.1 3.4 342.8 3.9 353.6 5.4 359.4 c. Selected Plan. Flooded area maps were prepared for the 2-year, 5-year, lO-year, 25-year, 50-year, 100-year, and SPF flood with project storm events. These maps were interfaced with the existing land use maps to obtain the depth of flooding in the residential structures. The structure and content damage was estimated using depth-damage curves developed for the area. Additional damage was calculated for autos, lawns and shrubs, road- ways and culverts. The results of these calculations are shown in the tabulation on table E-4. These reflect the elimination of most of the flooding in the Mon Bijou and Glynn areas due to the diversion of water around the developed portions. E-9 • SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX F CULTURAL RESOURCES • SECTION 205 DETAILED PROJECT REPORT EsTATE MON BIJOO ST. CROIX~ U.s. VIRGIN ISLANDS APPENDIX F CULTURAL RESOURCES TABLE OF CONTENTS ~ACKGROUND SURVEY RESULTS CONCLUSIONS 1. 2. 3a. 3b. 3c. 3d. 3e. 3f. 3g. 4 . LIST OF FIGURES Known Cultural Resources Location of Proposed Project Survey Sections Suvery Sections Survey Sections Survey Sections Survey Sections Survey Sections Survey Sections Lebanon Dam Site F-i PAGE NO. F-1 F-1 F-2 F-2 APPENDIX F CULTURAL RESOURCES 1. A cultural resources survey was conducted of the Mon Bijou Flood Control Project area for the u.s. Army Corps of Engineers, Jacksonville District (Cultural Resources Survey: Mon Bijou Flood Control Pro·ect, St. Croix, V.I._ 1 8 • 1s survey was es1gne to 1 ent1 y escr1 e any s1tes in the ~roject area, (2) evaluate the significance of any located sites and assess their eligibility for nomination to the National Register of Historic Places (NRHP), and (3) prepare mitigation plans for any NRHP sites. Work was accomplished in compliance with the National Historic Preservation Act of 1966, as amended (PL 89-665); the Archeological and Historic Preservation •Act, as amended (PL 93-291); and Executive Order 11593. The report was coordinated with the State Historic _ Preservation Officer (SHPO) and the National Park Service. Background. 2. The proposed Mon Bijou Flood Control Project crosscuts a portion of the Upper Salt River Archaeological District, which is included on the National Register of Historic Places (NRHP). Four prehistoric (Saladoid) sites are located within this district (Glynn 1 and Glynn 2, and Windsor 1 and Windsor 2). Three other sites have been identified in the area (Concordia 2, Concordia 3, and Windsor 4), and another- the Lebanon Dam Site- was dis- covered during the survey conducted for this project (see figure 1). Survey. 3. Fieldwork was conducted from 24 September through 16 October 1983, and focused on a corridor defined as approximately 61 meters wide by 2,016 meters long. This corridor was identified by establishing a centerline for the proposed bypass channel and extending approximately 30.5 meters on either side (see figure 2). 4. Field investigations entailed both surface examination and subsurface testing. Transects divided the area into approximately 30m x 30m sections. These transects were marked, and a 1-meter wide path on each side was visu- ally inspected. This surface study was subsequently supplemented by test units, again placed at 30-meter intervals. Sixty-eight (68) such units were dug. The depth of each was determined by the presence of hard clay or rock, and the majority reached 50-60 ems (see figures 3a-3g). 5. In addition to this systematic pattern of coverage. a reconnaissance was made of significant sitesbordering the proposed channel. The purpose of this additional investigation was to establish the boundaries of Glynn 1 and the Lebanon Dam Site to see if they extended into the project corridor. F-1 Results. 6. No significant cultural resources were identified in the proposed project area. Testing of Glynn 1 and the Lebanon Dam Site suggested that materials found inside the project area were secondary or tertiary deposits resulting from slopewash. • 7. One potential site was identified. A depression located west of the Estate Lebanon stock pond may be a prehistoric or historic well. Stones filling the area precluded investigations to determine its origin. Conclusions. 8. The survey concluded that no known significant sites will be adversely affected by construction of the Mon Bijou Flood Control Project. None were identified within the corridor itself, and, since neither the water level nor the velocity will be increased by the proposed project, no adverse effects to downstream sites is anticipated. 9. However, given the proximity of Glynn 1 and the Lebanon Dam Site to the project area (see figure 4), and because the channel passes through a National Register District, an archeological monitor will be present during construction to ensure that no significant sites are adversely affected. In addition, the construction contractor will remove the stones blocking the depression area, and an archeologist will determine if it represents a significant cultural resource. If any sites are identified that will be impacted by the project and that are eligible for nomination to the NRHP, mitigation will be accomplished. F-2 e ' I Cllllatonc ruma & other archaeo- logical lilel .. • FBi.m f3 e:. ~II r DNRHP diatricl e Figure 1 Known cultural resources in the region of the proposed project. e ·, e I contour interval: 40 m ---supplemental contours: 20 m It 0 1000 om 500 (Base: DCCA 1976) Figure 2 Approximate location of the proposed project centerline, with numbered turning points. e e \ \ \ \ ', I \ • . I -- ~-:......_ - -- \ I n/ PJ· I- - : I I,- .. , r --. ··---..,.. .. I . . ... 0 ~ .... ... ... 0 u .., u Ql ~ 0 ... Cl. Ql .c .., c .... CD c Q .... .., as u 0 ..... ~ = CD CD c 0 .... ... (j Ql (1:1 >- QI • >-= .,.. CD = Q c.n ... Figure 3b \) ~:::::: o I . I ---- ~-- ,· Survey sections and test locations in the project corridor: parcel 246 access road to Glynn subdivision. I I \ ', ) e .• ,. Figure 3c e • Survey sections and test locations in the project corridor: Glynn subdivision, and addi Lional diversion channel. ' e . ~ c .... al c c .... ... ca t.l ~ - ,... ·.- LL e e e / ·/ / ,---. -_.-·:; ~;~ ... _ -- I --- -::·.:.:.-;-.-_...··· r-: -.,;~~-~ u J ·./'_.._;.;.,.~ ~--·:"' ... ~ .. ~- ~ .•, ..... ~~---· _-.. - / '1-:::..7 ..... -' /' .,..,.,.;, ~ -:"· _,.· ---~•v /. ;:---.-:. . 7 • -/ _,'! ~ /" J" - - / . . . / ;:;. <--" I , . ;..-- <- , /-- ~ .. .. ,~ ... .,......:.·./. / ? . ,. .. ~~ ..... / ) I ~ _, / / ' ....... ) ( " Figure 3e Survey sections and test locations in. the project corridor: Point 4 to stake 48. e ' ' \ I I I , \ I . I \ \ \ I 'I --~~-----· t. -~/ / -----· / ,,/ // / .. , .. - ·- // ' ----/ II / . I _____ /.I .... , . ..._ u ,--...,. / ...... / 11,- ' / ! ........ _ . .._____.... . Figure 3f Survey sections and test locations ln the project corridor: stake 46 to western Estate Lebanon Ill 1 1 acce1:1a road. e e ' \ I: . ' . ' \ ..... ,, '. I I / ; i --; ' ' ,_ .' .,, /, ' 4J CJ Gl ~ 2 "'''" c. J 4J . ..... u.. Figure 4 •• •, • ' II .. C .. ~) .. __/ • ... .. •• I project '\. SECTION 205 DETAILED PROJECT REPORT ESTATE MON BIJOU ST. CROIX, U.S. VIRGIN ISLANDS APPENDIX G LOCAL COOPERATION AND PUBLIC INVOLVEMENT APPENDIX G LOCAL COOPERATION AND PUBLIC INVOLVEMENT This appendix contains the Letter of Intent and acknowledgement of the draft Local Cooperation Agreement (LCA) prepared in conjunction with the project's local sponsor, the Public Works Department of the Government of the U.S. Virgin Islands. Also included within this appendix are comments received from those who have reviewed the draft report. These comments and those received during a public workshop on St. Croix at the John H. Woodson Junior High School on June 30, 1987, have been incorporated into this final report. Local press coverage of the workshop is also included. G-1 DIVISION .e IN REPLY ADDRESS COMMISSIONER OF PUBLIC WORKS GOVERNMENT OF THE VIRGIN ISLANDS OF THE UNITED STATES CHARLOTTE AMALIE, ST. THOMAS, V.I. P.O.BOX 4400 PUBLIC WORKS DEPARTMENT Office of the Commissioner November 16, 1987 Colonel Robert L. Herndon District Engineer U.S. Army Corps of Engineers P. 0. Box 4970 Jacksonville, FL 32232-0019 Dear Colonel Herndon: We are reviewing the draft Local Cooperation Agreement (LCA) as proposed for the Estate Mon Bijou/Glynn Area of St. Croix. Refer ........................ . As the local sponsor of the proposed flood damage reduc- tion measure on St. Croix, we intend to fulfill our obligation as ultimately negotiated in the completed LCA. Sincerely, Projects GSS/alg • UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION II OCT 1 B 1984 Mr. A. J. Salem Chief, Planning Division Department of the Arrl!i 26 FEDERAL PLAZA NEW YORK NEW YORK 10278 JaCksonville District, Corps of Engineers P.O. Box 4970 Jacksonville, Florida 32232 Dear Mr. salem: we have reviewed the feasibility study notice regarding the proposed flood control channel located at Estate Mon Bijou, St. Croix, u.s. Virgin Islands. Based upon the brief project description and map provided, it is difficult to determine if the proposed channel modifications will i.rtpact wetland areas. If wetland areas are impacted by the proposed project, please be advised that 404 (b)(1) Guidelines will apply and further coordination between our respective agencies will be necessary. If you have any questions relating to the above comment, please contact Mr. Christopher Militscher of my staff at (212) 264-0522. Thank you very much for the opportunity to comment. Sincerely yours, ~Md M. WJJ---, - Richard M. Walka, Chief Environmental Impacts Branch UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION II 26 FEDERAL PLAZA NEW YORK. NEW YORK 10278 AUG 1 3 1987 Mr. A.J. Salem Chief, Pla.nning Division Department of the Army Jacksooville District, Corps of Engineers P.O. Box 4970 Jacksonville, FL 32232-0019 Dear Mr. Salem: The Environmental Protection Agency (EPA) has reviewed the draft definite project report and environmental assessment for the proposed flood control channel located at Estate Mon Bijou, St. Croix, Virgin Islands. Based on our review, we offer the following comments: The environmental assessment states that valuable mangrove and salt pond wet- lands located in the Salt River Bay will not be adversely affected by the project. Detailed information to support this conclusion should be provided. In addition, consideration should be given to our comments of July 21, 1982, concerning the clearing of lower channels leading into Salt River Bay as an addition to the proposed plan. Appropriate measure should be employed during the construction and operation of the flood control channel to ensure that the vegetation that controls soil retention is not destroyed. In addition, care should be taken to ensure that the pre-historic sites at Glynn I and Lebanon Dam are not disturbed. Thank you for the opportunity to comment. If you should have any questions, please contact Ms. Vicki J. Snitzler of my staff at (212) 264-6677. snrely yours, .1 ~~ '1\ {; !Lwf'"'"- Robert W. Ha.rg_""'ve, Chief Federal Activities Section Environmental Impacts Branch .. ~ • -r·· ~ . . United Slates Department of the tterior fiSH AND WILDLIFE SERVICI 1 D1v1s1on of Ecolog1cel Services . MQaguez, Pu.rto Rt co 00701 Mr. A. -J. Sale~~ Act1nl Chief. Planning Otvis1on u.s. nqy·Corps of Engineers P.O. Box 4970 Jecksonvtlle. Florida 32232 June 28, 1982 • Re: Estate Mon ltjou St. Croix, Virgin Jslandl Dear Str: This constitutes a Planning A1d latter-for the above referenced project. Tb11 is prov1dt4 1n accordance with the Fish and Wildlife Coordtnatton Act (48 Stat. 401, as amended; 1a u.s.c. 661 et seq.). • - . . ' This letter is based on a review of the pre11•1n•ry reconn.issance repol"t including alternatives and a field review of .the area conducted on June 17, 1182. .. Oessrtpt1on of tbe Project Aree ~ . . ' . Estate Mon Bijou is locatecl tn the north-central .-.rt of St. Croix aftcl 1t ·· . located about 5 miles west of Christiansted. The area experiences severe flooding due to steep slopes that can create flash floods during periods ·of heavy rain. The fact that severe flooding occurs is evident tn thlt several homes in Estate Mon t1jou have been abandoned due to the flOoding 1 cond1t1ons preient w1thfn the drainage. The upper portions of the MDn 11~ou/61ynn watershed is characterized br a 111xtvre of upland vegetation and open pasture areas. The 110st pro~~1nent structure wtthin the watershed ts the housing development. Vegetation in the upper portion is 1110stly grasses and s01n1 large trees such as fllllboyan (O.lonix ~,ta), thorn scrub (Acacia), gulllbo-t111bo (Bursera siMrubt), Mngo (Rang 3ra indica) and taMrindo (~indus indica). thire are no •tlands in e upper portion of the drainage·. The most significant ecolog1ca1 area w1thtn the entire drainage is Salt River a~. the receiving waters of the dreinage. This area ts characterized b1 mature stands of mangroves and salt ponds that provide s1gnfffcant hlbttat for aquatic wildlife. As now outltnad, the proposed project would- not illlplct the Salt River Bey area, at least fro~~ a construction sUnclpoint. However, the deteraination remains to be 111de on whether changes in now ·d~ to water retention w111 have an, impact on the ~ • . ~·· .. • .e • • - .~ l . . surve.Ys and conversations w1th personnel froM the Yfrtin Jslancll vovern1111nt -- tftd1cat• there art no significant habitats or wt1d1tfe concentrations wtth1n the proposed project. Some songbird habitat w111 be 1~acttd but the effects would not be considered significant. Y1rg1n Islands Department of Conserve• tion and Cultural Affairs (DCCA) personnel will conduct a complete survey of the project area once the f1na1 alternative is selected. The tdea of the survey is to identify any significant trees o~ patterns of vegetation thit should be protected. It is not expect•d that such areas will be significant. . . Reconwnendations During the recent survey, it was noted that the lower portions of Mon Bijou/Glynn watershed channel is~everely silted up. The reconnaissance report does not address any plans to improve the lower channel, especially the channel area above the road before entering Salt Rtver k,y. Serious consideratfo~ should be given to conducting a channel clearing tn the lower section of the drainage in coordination with the proposed project. The lower section of Mon Bijou Gut w111 continue to flood unless the chennel ts cleared. tn discussions with OCCA personnel. 1t was pointed out thlt the1 would favor the construction-of Plan 4 which would provide adequate sto~aoe for flood control. It was also pointed out that local farmers _,uld be interested tn obtaining water rtghU to water stored in any retention structure. This IDI1 or 11111 not become a factor to consider in evaluating the project • . -.. . - ·It 11 not ant1c1peted that the project will have an adverse effect • f1sla • or wildlife spec1as. • , . . -. -- - ... =··. . . - ... - --· - . -- - ..... . -:· .. • .. - . cc: MMFS, PanaN City EPA • New York DCCA, USYI ARD-E, Atlanta ' .. - , - . . ~-.··-·a...~ . ti A. 8l1~kanst\1 p "' . ~ ~ F1e1 Supervisor . . .~ .. • • • --- ~· '.' l UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION II 2 6 FEDERAL PLAZA NEW YORK. NEW YORK 10278 21 JUL 1932 Mr. A • .J. Salen, Acting Olief Planning Division Department of the Arrrry Corps of Engineers, Ja&.sonville District P.o. Dox 4970 .Jacksonville, Florida 32232 Dear Mr. Salem: '!his is in response to your letter dated .June 10, 1982, inviting c:::arments on the study being~perfonned by the Corps on flood control measures at Estate fobn Bijou, St. Croix, u.s. Virgin Islands. D.lr agency has reviewed the information attache:'\ to your letter, and we ·Offer the folla.rlng catrnents: 1. '!he possibility of creating retention and storage capacity for flood waters should be ~xplored due to present Virgin Islands water supply limitations. • 2. Salt River Bay, the receiving water b:rly of present drainage, is characterized by stands of mature mangroves and salt ponds. Both of these provide habitat for aquatic wildlife. Reduced freshwater inflow may have impacts on fish a.burrlance, sul::rnerged aquatic vegeta- tion, and water quality within the Bay by affecting mixing and/or flushing. '!he potential for such i.rrq?acts should be assessed for each scenario or plan. 3. 'lh'e u.s. Fish & Wildlife. Service has- indicated that th12ir surveys of the area found heavy silt clogging of the lO"Her channels leading into Salt River Bay. Plans should include a provision to clear these areas. Please keep us apprised of any additional developments relative to this study. 'Ihank you for the opFQrtunity to o::mnent. Sincerely yours, . ~M,(_ )1. ~~ dktt_ ~,., Anne Norton Miller, Cl1ief ~~ Environmental Impacts Branch OF'.F'ICE 01' THE COMMISSIONER • GO\'ER~!IIE::'\T or THE \"IRCl?< 1:--LA~\DS OF THE l'!'l"I1'ED STATES ClJeparlment o{ Conservalton anc/ Cultural .Jr.f{airs P. 0. BOX 4340 CHARI...OTTE AMAI...IE, ST. THOMAS, V.I. 00801 Mr. A.J. Salem Chief Planning Division Department of the Army Corps of Engineers P. 0. Box 4970 September 23, 1987 Jacksonville, Florida 32232-0019 Dear Mr. Salem: RE: Estate Mon Bijou/Giynn Section 205 Flood Control Project St. Croix, V.I. The Division of Coastal Zone Management has reviewed the Draft Definite Project Report and Environmental Assessment for a Flood Control project at Estate Mon Bijou, St. Croix, Virgin Islands. This project is in Tier II, and not within the Coastal Zone (Tier I). However, the Department has authority to make the determination for federal consistency pursuant to the provisions of Section 904-7 of the rules and regulations of Title 12, Chapter 21, V. I. Code, and the Coastal Zone Management Act of 1972, as amended ( 16 U.S. C. Section 1451, et. seq.) and the regulations governing such federal consis- tency determinations ( 1 5CFR Part 930) which became final June 25, 1979. The proposed activity is consistent with the goals and policies of the Virgin Islands Coastal Zone Management Act. I find that the project will not directly impact the coastal zone, and do not object to the proposed project. Additionally, attached find a copy of the Water Quality Review and Certification for said project. • " • Mr. A. J. Salem September 23, 1987 Should you require further information please contact me or Mr. Benjamin I. Nazario, Director, Division of Coastal Zone Management, at (809) 773-5774 or (809) 774-3320 ext. 145. ADS/rds Alan D. Smith Commissioner cc: James C. Savage-Commissioner, DPW Benjamin I. Nazario, Director, DCZM Project File GOVERNMENT OF THE VIRGIN ISLANDS OF THE UNITED STATES CHARLOTTE AMALIE. ST. THOMAS, V.I. DIVISION Office of the Commissioner April 2, 1987 Col. Charles T. Myers III District Engineer P.O.BOX 4400 PUBLIC WORKS DEPARTMENT U.S. Army Engineer District, Jacksonville P.O. Box 4970 Jacksonville, Florida 32232-0019 RE: LETTER OF INTENT Dear Colonel Myers: IN I'IEI'I.Y ADDI'IE •• COMMI •• IONIEI' OP' I'U81.1C WOII Refer •...•.......•••..•... The Department of Public Works for the U.S. Virgin Islands has reviewed the draft report on Mon Bijou and generally concur with the findings contained therein. The Government of the Virgin Islands is ~ public body legally capable of fulfilling the requirements of local cooperation for this project in accordance with Section 221 of the Flood Control Act of 1970. This Letter of Intent, while not considered a binding contract, is furnished to document our support of this project and our intent to act as local sponsor for its implementation. We understand that following project approval but prior to construction, we will be asked to enter into a binding agreement to furnish certain items as outlined in the report. Specifically, we intend to: a. Provide, prior to construction, an amount equal to not less than 25 percent of total project costs for flood control, at least 5 percent of which will be cash. The amount to be provided shall include the value or cost of all lands, easements, right-of-way, and utility and facility alteration and relocations necessary for construction and subsequent maintenance of the project including suitable burrow and dredged material disposal areas, as may be determined by the Chief of Engineers. b. Provide without cost to the United States all lands, easements, and rights-of-way, including suitable disposal areas as determined by the Chief of engineers, necessary for construction and maintenance of the project. Colonel Myers April 2, 1987 • c. Accomplish without cost to the United States all alterations and relocations ~f buildings, transportation facilities, storm drains, utilities, and other structures and improvements made necessary by the construction. · d. Hold and save the United States free from damages due to the constructio~ works, not to include damages due to the fault or negligence of the United States or its contractors. e. Maintain and operate all the work after completion in accordance with regulations prescribed by the Secretary of the Army • f. In a form acceptable to the Chief of Engineers, enact ordinances and promulgate regulations to prevent encroachment on the floodplain storage areas, channels, and rights-of-way and to prevent an undue increase in the flood damage potential. g. Assume all project costs in excess of the Government limitation of $5,000,000. h. Comply with the provisions of Public Law 91-646, Uniform Relocation Assistance and Real Property Acquisition Act of 1970. i. Comply with the conditions set forth under Title VI of the Civil Rights Act of 1964. Sincere 1ly, /I/ r ----- . -·- James C. Savage Acting Commissioner JCS/GSS/csh cc: Mr. Gabriel St Surin DIVISION GOVERNMENT OF THE VIRGIN ISLANDS OF THE UNITED STATES . CHARLOTTE AMALIE. ST. THOMAS, V.I. PoO.BOX 4400 PUBLIC WORKS DEPARTMENT OFFICE OF THE COMMISSIONER August 12-, 1987 Mr. A. J. Salem Chief, Planning Division u.s. Army Corps of Engineers Jacksonville District P. o. Box 4970 Jacksonville, FL 32232-0019 ' P.E: 11011 BIJOU FLOOD CORTROL RBDUCT:IOR PROGRAM S'l'. CROIX, U.S. V:IRG:IR :ISLARDS Dear Mr. Salem: • IN llti!~L.Y ADDIItltSS COMMISSIONIEI't OP' ~U8L.IC WORKS Refer o o o o o ooo o oo•••o•oooo o oo As requested, transmitted are our· comments on the proposed "Local Cooperation Agreement " (LCA) for the referenced project. If they are agreeable to you, please incorporate them in the final LCA and forward three copies to us for execution. The agreement should be signed by the Commissioner of Public Works. Therefore, paragraphs I and II can be neglected. Sincerely, jftlw/-11 ~..;._ 3':abriel St. Surin · Engineer and Acting Director of Planning & Development Attachment GSS/alg cc: Mr. James C. Savage Mr. Miguel Farrington Mr. O'Neal Abel L COVERrx:.u:NT OF 1 ~~\ \'} Q~ THE ViRGiN ISLA:-m:; OF THE UNITED STATES(~\ ~~\. ?.Ur • ""?l• -·o·- v ·:or:..hS \Jt'. DEPARTU.EtH OF LAW r'j~\_\C \ 1 Norre Gade No. 46 Charlotte Amalie, St. Thomas, V.I. 00802 July 22, 1987 Hon. James c. Savage Commissioner Department of Public Works St. Thomas, V.I. 00801 In reply plene refer to our File No. ------- Re: Proposed Agreement with the Department of The Army Dear Co~issioner Savage: The proposed agreement with 'the Department of the Army to construct a flood control project in Estate Mon Bijou, St. Croix has been reviewed and the following are my comment$ to same. 1. The first paragraph on page I should be modified by inserting after the words "Commissioner of" on the last line the words "Property and Procurement on behalf of". 2. The second WHEREAS cause on page I should identify more particularly what the Flood Control Act is. 3. I am unable to determine exactly what paragraph IIg means. I can not offer any comments on this subparagraph. 4. Paragraph IIi violates the provisions of 33 V.I.C. 3101 which prohibits the contracting for amounts in excess of appropriations. If there is an appropriation in existence, then a contract may be executed for an amount up to that appropriation. 5. Public works must have an appropriation to cover the cost of the items listed IIIb. This would be indicated on the contract by the inserting at the end of the contract the .Account Code and the MED number. 6. Paragraph IIId provides that the Virgin Islands shall comply with the provision of Public Law 91-646. If there are any sums payable under this law are the funds available? , Hen. James c. Savage July 22,1987 -2- 7. Article VI in so far as it deals with the Virgin Islands cash contributions is subject to the same limitations as set out in paragraph 4 above. 8. Article IX is subject to the limitations as set out in paragraph 4 above. 9. It may be that paragraph XVb should be expanded to include the Virgin Islands and it may resolve some of problems concerning the Virgin Islands contingent liabilities. 10. I find no where in the proposed agreement anything concerning the title to the work to be performed by the Army. 11. In addition to the items referred to in paragraph 5 above, provisions should be made at the end of the proposed agreement for the signature of the Acting Commissioner of Property and Procurement . • ·. / Sincerely, ~ w~ ·~ROTT Assistant Attorney General VIRGIN ISLANDS MAILING LIST FEDERAL AGENCIES Director Office of Federal Activities EPA, Region II 26 Federal Plaza New York, New York 10278-0012 Area Supervisor National Marine Fisheries Service Environmental Assessment Branch 3500 Delwood Beach Road Panama City, Florida 32407-7403 Director, Caribbean Area Soil Conservation Service, USDA GPO Box 4868 San Juan, Puerto Rico 00936-4868 Superintendent Virgin Islands National Park National Park Service P.O. Box 806 St. Thomas, Virgin Islands 00801-0806 Territorial Representative Federal Highway Administration U.S. Federal Building, Room 114 Veterans Drive St. Thomas, Virgin Islands 00801 Chief Environmental Impacts Branch U.S. Environmental Protection Agency 26 Federal Plaza, Room 400 New York, New York 10278-0001 Regional Director U.S. Fish and Wildlife Service 75 Spring Street Southwest Atlanta, Georgia ~0303-3309 Field Supervisor u.s. Fish and Wildlife Service Caribbean Field Office Post Office Box 491 Boqueron, Puerto Rico 00622-0491 San Juan Area Office U.S. Army Corps of Engineers ATTN: CESAJ-PG 400 Fernandez Juncos Avenue San Juan, Puerto Rico 00901-3299 Chief, Caribbean District, WRD U.S. Geological Survey GPO Box 4424 San Juan, Puerto Rico 00936-4424 TERRITORIAL GOVERNMENT Honorable Ron de Lugo House of Representatives Washington, D.C. 20515-0001 Honorable Alexander A. Farrelly Governor of the Virgin Islands of the United States Office of the Governor Charlotte Amalie, St. Thomas, Virgin Islands 00801 Executive Director Virgin Islands Port Authority P.O. Box 597 St. Thomas, u.s. Virgin Islands 00801-0597 Virgin Island Housing Authority P.O. Box 979 St. Thomas, U.S. Virgin Islands 00801-0979 State Historic Preservation Officer Virgin Islands Planning Office Division for Archeology & Historic Preservation Chinnery Building 129-133 Sub-Base St. Thomas, u.s. Virgin Islands 00801-5000 Executive Director Virgin Islands Urban Renewal Board P.o. Box 2295 St. Thomas, U.S. Virgin Islands 00801-2295 ~' TERRITORIAL GOVERNMENT Cont'd Director, Public Relations Office Government of the U.S. Virgin Islands St. Thomas, U.S. Virgin Islands 00801 Commissioner Virgin Islands Department of Commerce P.O. Box 1692 St. Thomas, U.S. Virgin Islands 00801-1692 Commissioner of Public Works Government of the U.S. Virgin Islands P.O. Box 4400 Charlotte Amalie St. Thomas, U.S. Virgin Islands 00801-4400 Assistant Commissioner Department of Agriculture P.O. Box 82 St. Thomas,·u.s. Virgin Islands 00801-0082 Director of Tourism P.O. Box 16921 St. Thomas, U.S. Virgin Islands 00801-1692 Mr. Brian Turnbull Director Virgin Islands Planning Office Chinnery Building 129-133 Sub-Base St. Thomas, U.S. Virgin Islands 00801-5000 Office of the Commissioner Department of Conservation and Cultural Affairs 179 Altona & Weigunst Charlotte Amalie, St. Thomas, U.S. Virgin Islands 00801 Mr. Benjamin Nazario, P.E. Director Coastal Zone Management Division Department of Conservation and Cultural Affairs 179 Altona & Weigunst Charlotte Amalie,St. Thomas, u.s. Virgin Islands 00801 Director Virgin Islands Planning Office Chinnery Building 129-133 Sub-Base St. Thomas, U.S. Virgin Islands 00801-5000 Mr. Gabriel St. Surin Special Assistant Department of Public Works Government of the U.S. Virgin Islands P.O. Box 4400 St. Thomas, U.S. Virgin Islands 00801-4400 Mr. O'Neal A. Abel Assistant Commissioner Department of Public Works P.o. Box H~ Christiansted St. Croix, U.S. Virgin Islands 00820 Department of Conservation and Cultural Affairs Division of Fish and Wildlife Box 1878 Frederiksted St. Croix, U.S. Virgin Islands 00840 GOVERNMENT OF THE VIRGI_N ISLANDS OF THE UNITED STATES CHARLOTTE AMALIE, ST. THOMAS, V.I. P.O.BOX 4400 PUBLIC WORKS DIPARTMINT DIVISION Office of· the Cc:mnissioner August 5, 1987 Mr. A. J. Salem Chief, Planning Division U.S. Army Corps of Engineers Jacksonville District P. 0. Box 4970 Jacksonville, FL 32232-0019 RE: M:N BIJOU FI1XD cx:NI'OOL. PROJECT st. CroiX, ·u~s~ Virgin· Islands Dear Mr. Salan: We have reviewed the Draft Definite Project and Environmental Assessment Report for the referenced project and cbncur with your reccmnendations and the proposed alignment. CONNISSION&It OP' PU.I.IC WORK • .... , ........................ We v.uuld like to note the attached letter to and fran the Federal Highway Administration regarding the construction cost of the new bridges. It appears that we could eliminate the installation of one bridge. This would reduce our local share and help us finance the project. Please let us have your thoughts on this proposed change. Sincerely, ·LI~ St'.. Surin Eng1neer and Acting Director of Planning & Developnent Attachments GSS/alg cc: Mr. James C. Savage Mr. Miguel Farrington Mr. Aloy Nielsen / \ I . ·- ' , . ' ,-.. \' :I • '. • . :. ~ . :. !"" 7. T C: :--. ' .. ~ . '.'. ! , . - ·- ~ ·. ~ ...... Di\'lSIC>N Of:f ice of the Commissioner July 17, J 9S7 ~~r. Ste\·e F.apley T c:-rritor ial Represern:.a T i ,·es Fec::-ral Riglw:ay Adninistr2.1 ion Fecir:>ral BuiJ ding, Ro~m l3S St. Tho:r.2.s, V. I . 00801 Dear Mr. Rapley: Tne Anny Corps of Engineers has distributed the Draft Definite Project and Environmental Assessrrr2nt Report to '\'arious concerned agencies for comnents. We are in favor of the proposed plan. Hm;ever, it calls for the installation. of three (3) b:irdges, and we w::mld like to know if the Federal Highway Administration can provide the funds for the construction of the three bridges under the "Bridge Rep)acenent Program". It is anticipated that the construction plans for the Kadir Gut Project will also include one bridge on Highway 30. Sincerely, .fdtJ_,/1~ p19abriel St. Surin Engineer and Acting Director • of Planning & Development GSS/alg :: .. ( ·C~ U 5. DEPARTMENT OF TRANSPORTATION c F £,-,ERA L H IGHW f, Y 1.. Dt·'l N:S~ o; A TtON REGION ONE Federico Degetau Federal Building and U. S. Courthouse Room 15n, rerlos Chardon Street Hato Rey, Puerto Rico 00918-2288 July 28, 1987 Mr. James C. Sava~e, Commissioner V.I. PublicWorks Department P.O. Box 4400 St. Thomas, U.S. V.I. 00801 Attention: Mr. Gabriel St. Surin Acting Director of Planning and Development Dear Mr. Savage: Subject: Mon Bijou Flood Control Improvements IN A~PLY AE~ER TO: HVI-01 The Virgin Islands do not receive an apportionment of Bridge Replacement Program funds. The three bridges required by the subject flood control .· ~oje~t could be funded from either Territorial funds or Primary funds ~f ~e roads are included on the Federal-aid primary system). if!) LtJ l-ha~ taken the liberty of discussing the subject project with both ~. ~lio Colon and Mr. A. J. Salem of the Corps of Engineers. Mr. Salem ~ ~orted that execution of the agreement to fund the project by C6mm~ioner Savage is the next action required to continue the design of @is ~oject . ...:: ~ - Cl ~m~ailable to meet and discuss FHWA participation in the construction of tne roadway and bridge improvements, if you so desire. cc: Mr. Aloy Nielsen Commissioner James C. Savage s!il:o?44 Stephen K. Rapley Territorial Representative United States Department of the Interior FISH AND WILDLIFE SERVICE CARIBBEAN FIELD OFFICE P.O. BOX 491 BOQUERON, PUERTO RICO 00622 June 17, 1987 Mr. A.J. Sal em Chief, Planning Division Jacksonville District, U.S. Army Corps of Engineers PO Box 4970 Jacksonville, Florida 32232 • Re: Environmental Assessment, Estate Mon Bijou, St. Croix, U.S. Virgin Islands Dear Mr. Salem: This is in response to your May 29, 1987, letter requesting our comments on the Environmental Assessment for the Estate Mon Bijou flood control project. We have assigned Log #4-4-87-052 to this activity and would appreciate your referring to it in any future correspondence on this matter. We concur with your determination that the project would have no adverse impact on Federally listed threatened and endangered species. No significant impact on wetlands is anticipated. We therefore do not object to the project as presently designed. This does not constitute a Biological Opinion as described under Section 7 of the Endangered Species Act. However, it does fulfill the requirements of the Act and no further action is required. If modifications are made in the project, of if additional information indication potential impacts to listed species becomes available, consultation should be reinitiated. cc: COE, San Juan EPA, New York AWE, Atlanta Sincerely, Robert T. Pace Acting Field Supervisor • Colonel Charles T. Myers, III UNITED STATES DEPARTMENT 0~ COMMER~E N•&lon•l Oce•nla •nd A&mo•pherlo Admlnl•&re&lon NATIONAL MARINE FISHERIES SERVICE Southeast Regional Office 9450 Koger Boulevard St. Petersburg, FL 33702 June 12, 1987 F/SER113/SD District Engineer, Jacksonville District Department of the Army, Corps of Engineers P.O. Box 4970 Jacksonville, FL 32232-0019 Dear Colonel Myers: The National Marine Fisheries Service has reviewed Draft Report and Environmental Assessment for reducing flood damages in the Estate Mon Bijou and Glynn residential areas on St. Croix, U.S. Virgin Islands. Since the project will not impact marine resources, we have no comments. We appreciate the opportunity to review and comment on this project. Sincerely yours, ~~~ ~Richard J. Hoogland Assistant Regional Director Habitat Conservation Division United States Department of the Interior GEOLOGICAL SURVEY GPO Box 4424 San ~uan, Puerto Rico 00936 Mr. A. J. Salem Chief, Planning Division Department of the Army July 8, 1987 Jacksonville District, Corps of Engineers PO Box 4970 Jacksonville, Florida 32232-0019 ' Subject: Draft definite project report and environmental assessment for estate Mon Bijou, St. Croix, U.S. Virgin Islands. Dear Mr. Salem: Our technical staff has reviewed the subject report and agrees on Plan D· as the best alternative. The proposed bypass channel will reduce flood damages and related problems in the area. AZ/ECD/an Sincerely, ( ~~ Allen L. Zack District Chief, WRD • CO\T:ll:\~I·E\1' OF THE VIRGIN ISL\.:\DS OF THE UNITED STATES Department of Conservation and Cultural Affairs Division of Fish and Wildlife BOX 1878, FREDERIKSTED ST. CROIX, U.S. VIRGIN ISLANDS 00840 13 July 1987 A. J. Salem, Chief,Planning Divis!on Flood Control and Flood Plain Mgmt. Branch Department of the Army Jacksonville District, Corps of Engineers P. 0. Box 4970 Jacksonville, FL 32232-0019 Dear Sir: Re: Draft Definite Project Report and Environmental Assessment, Estate Mon Bijou, St. Croix, Virgin Islands, dated May 1987. The St. Croix staff of the V.I. Division of Fish and Wildlife (DFW) has reviewed the subject Report and Assessment as requested by your letter of May 29, 1987. We find that the proposed'project, as described in the subject document, is not expected to have any significant impacts, direct or indirect~ on fish and wildlife. We know of no published reports of, nor the existence of, any species, in the project area, currently listed or proposed to be listed as endangered or threatened by the U.S. Department of the Interior. This determination is made without benefit of field visits to the area, but rather through the knowledge of the known occurrences, habits and habitats of these species in the Virgin Islands. We reauest that the St. Croix staff of DFW be retained on your mailing list for this project and that we be duly notified of all modifications or alterations to the plan as presented in the subject document. . DIV!.:ION OF FISH & WILDLIFE Room 203 Lagoon Street Complex frederiksted, U.S.V.I. 00840 A.J. Salem, Chief Planning Division 13 July 1987 Page -2- Thank you for allowing us to review this plan. Sincerely, {~~,_,_ William~ Tobias Fisheries Biologist II orr1cc or T 1 1C COMMIS:.510fH:.Il GO\'ETI'Nl\IENT OF TilE VIRGIN ISL\NDS OF '!'!TE 'l'i'\ITED ST.\TES --0-- DEPARTMENT OF PLANNING AND NATURAL RESOURCES July 31, 1987 Mr. A.J. Salem 179 ALTONA 8c WELGUNST CHARLOTTE AMALIE, ST. THOI\11\S, V.I. OOflO.-::! Chief, Planning Division Department of the Army , Post Office Box 4970 Jacksonvi1le, FL 32232-0019 Re: Federal Consistency Flood Control Diversion Channel for Estate Mon Bijou, St. Croix, U.S. Virgin Islands Dear Mr. Salem: We have reviewed the draft project report and Env.ironment Assessment for the above referenced project. This project while a direct federal activity is situated entirely within tier II zone and does not affect the Virgin Islands Coastal Zone (tier I). We find the project to be consistent with the Virgin Islands Coastal Zone Management (CZM) program and concur with the report pursuant to Section 904-7 (c) of V.I. Code, Title 12, Chapter 21 rules and regulations. Enclosed for your information, I submit the Water Quality Review and Certification for this project. Mr. A.J. Salem Federal Consistency - Mon Bijou July 31, f987 • Should you require further information, please contact me or Mr. Benjamin I. Nazario, Director, Division· of CZM at (809) 773-5774 or (809) 774-3320, extension 145. Commissioner ADS/mm · Enclosure,( 1) cc: Commissioner James C. Savage - PWD Thyra Budsan, Chief - A-95 Clearinghouse Gabriel St. Surin - PWD Francine Lang - DNRM Benjamin I. Nazario- DCZM GOVERNMENT OF THE VIRGIN ISLANDS OF THE UNITED STATES . . f) epartm C'fl t of Cnrrurvatinn and Cu/111 ral Affair.~ Natural Resources Manageme11t BUILDING II 1 - APARTMENT 114 -WATER GUT HOMES CHRISTIANSTED, ST. CROIX 00820 (809) 773..0565 COASTAL ZONE PERMIT APPLICATION WATER QUALITY REVIEW AND CERTIFICATION 1. CZM Permit ·Application No.: N/A 2. Date of Appl ication:_•i~l\~!87 3. Applicant: U.S. Army Corps of Engineers, Jacksonville District 4. Short Title of Work: Flood Control Diversion Channel For Estate Mon Bijou 5. ~~ater Quality Certification: Pursuant to Title 12, Ch. 7, Subch. 186 or-the Environmental Laws and Regulations of the Virgin Islands there is reasonable assurance that the proposed project can be executed without violation of the water quality standards. 6. Additional Information Requested or Needed for Certification: N/A 7. Comments or Special Restrictions: N/A 8. t•3rd YEAR ST. CROIX, U.S. VIRGIN ISLANDS WEDNESDAY, JULY 1,1987 No. 150 ·some Workers. Happy With Checks Others .Complain It Is Not Enough --4.- Jetllp'li Daniels of Public Works Ill-s off his chock. Avis photo by Jamn Wolks Jr. $15 Million Complex Planned ForCaneBay By John Commins "-~~'*' ,_ Wriw CHR.riANSTED, ST. CROIX CAPI - A St. Croix ........ It _.,.ny ... llllbmlftld ~~~- ., .. c:-tal Zona ...,..._ afllat for ' I '" lllillion .-ldlntill .-1 --X llong C... lilY. an Clfflciel •Ill T...-y. Aaconllnt ., Vlrlln lolencll .... .. perM*It afflot IIIUit clltermil\e " .. ~~~- .. COfYIPI.eto and tt.. ldloclule a public Nlring within 80 days. · · Suun Baatreu, Vice ..,.... d.tt of Antilles lnwt1m011t. Group, llid the plan "is the lint llllmltiw for the land" --- of the NNiativoly low population chnslty'' called for by-joeL Antilles ln-t ...,...,, See COMPLEX Pill" 23 By Jomos Wttks Jr. Avis Staff Writer Thousands of worket"s re· ceived checks Tutsday as S8 million ... dollars in ulary in· croasn _,. officially released by the V.I. Government. Some whooped with de· light, but many others cringed in pain when they saw how much they were ICtualiy re· c:aiving. Joseph Daniels, a Public Works .,ployoe with 22 years of Service. fell into the cringing category. He only received $148.96. "I don't know what kind of money this be," he shouted angrily. "I deserve more·•. Daniels pointed out that he only makes $10,000 a year reading water meters, 1nd he has to sell newspapers to sup- plement his income.· "Thot 's not enough .. " said one ·Health Dep,ertment em· pioyoe who uked not to be identified. uSome peooJe wanted money to send their kids to school. They gon' have btchanai in this ploce, me son". But other government em- ployees 11w it differently, "I'm happy with what I got. I would have liked to get the whole damned thing but I'm still happy," · said Henry Schutter, a 17 yoar emplOyee ~ fiORKERS P~~:e 24 Mon Bijou Residents Elated Flood Relief Within Sight By Andre Edwin • Avis Stoff Writer More thon 40 Mon Bijou re- stdents attended a mMt lng liSt night to Iiston lnd ask Quos- lions about 1 flood-control --'· which could save property in thot area ond, ·' perhaps, oven lives. The propo111, the result of 1 studv dOne bv. tho Army Corps of Engineers, is ostimoted at $3.9 million and was reQuested ~ tho Deportment of Public Works. Officials from both or~ t~niutions attended the m•t· ing It John H. Woodson Junior High School. Accord 1ng to reports. b• t-n 1975·1980, three major floods occurred in the Mon Bijou are1, causing widespread New Division Set For Human Servi:es By J011ico Thorpe Davis Avis Stoff Writer Governor Farrelly issued his first exea.:tive order yesterday outlining the functional fn~rnework of the newly created Department of Humon Services which will be Naded by former Social Welfare Commissioner Juei Rhymer. As lptCiflod by Act No. 5285, the rectntty PIIIOd Go!Mrnmont and Contolida- don Act of 11187, the Depart· mont Nd ._n dn91al*l os tho umbrella 1111f1CY for all - •nricos ponalnlnt .. you1h, childrwl, the handi- capped, .. elderly and low- ._.. adults and t.milios eu1hori•d 1D ~Iva funds LWidor the Older AINriCIInl Act and COm....,itv Services Block Grant funds. In ..,_t with Rhymer's earlier proposal to structure the new department into, six divisions and initiate personnel changes, Farrelly said in his order that the new Human Services will include: a Division of Adult Services; Senior Citizens Affairs; Children, Youth and Families; Financial Programs; Hindi· copped Services; and Volun- ...,. and special programs. The six departments will be Nlded by I pemor appoinl*l ldmlnistraiDr NIIO'Iintl ., an assistant com- milaioner. Programs within each division will be mlftlllld by a program clii'KIDr rapon- ing .. .. division lllmlnt. -r. Early last . w.k Rhymer IMd the Social Wolfere Depart· ,_t -.old be - of the SeeNEWP .. 23 domogo. The propolll eons for a "95" porcont flood reductiOn ovor tho next I 00 y•rs. Officials llid that tho work should bogin next year and completed within two years. They oxploined thot tho plan calls for the flood water going around the undeVeloped ~rt of tho Mon Bijou ••• instood of through the com- munity. The Army Corps will pay for more than half of tr. · project, and the loCII gov•· ment will fund the b1tan .. officials contended. IN/roy P~t~rvn, 11 rrsi- d~nt. mid, '1 11m ~llltrd thtzt this is ~oing to b~ don~. Whtzt · 11 lot of .41on Bijou rrsid~nts hlll'~n 't rNUnd is thllt th~ floods hiiW d~pl'rdllt~d th~ 'WIIM~ of thnr hom~s. '1 think thl& u .om~thlng th11t u lollg o~rdll~. It mould line bHn don~ yean 40-" John ~,;ria, -or ·,.: IDUI'CI plamer and . ltUdV _.....,. for the Mon Bijou project. •Ill the flooding .. -.sod by _,.. problems ln- dudlng llrp volumes of - _.... ..... 8luo MounUin and Cllhar. -., sl-• 1n the -· exlstint aulwrtl .. - 1111111 .. ~ RESIDENTS Pep 28 -,~,x.· '•st~l $•tvie• lnet••s•i Pe) F11nt/sFot l11111i . - - . . -- . . . . WIONEsDAV, .AJLY 1~ 1.7 150 THE ST. CROIX AVIS ::;::;.;;=:=:.:.:::.:..:.::..:.:~---_;_:-------------------should haw been ourted ~" • •JC · · Librory (Frederikstedl. when the onc!Cient- occurred. ,........ OM_, said •• tho ca• is - and sooner. · · t(Continued freia- 5)'. The Pre-School Grlftt Pro· finished." Ralph Mandrew, pK.dent r-e- posal is a 1-'hY document Tha other official, Germ., of the Mon Bijou H~wners "lthll Commllllon. :~ t':':!!..=::~ CO: site Rieckehoff Sampayo, Puerto ~=:.~~~';d =d~t ~ :,~ Tha AppMit Court would .,. Rico's Olympic Committee -tion rwgarding the time: ...,lace tho London-lined BRIEFS . . • • President lfld a member of Uble to begin work on the Pt!Yy CouncH, which now is (Continued from Pap 2)' the International Olympic project. tho -.rt of last resort for bellots (so-called "symbol Committee, said· .he feared a "We wanted to hear that aiminaJ cateS that originlte votes") to the extent 1hat rwptive reception in Indian of they are ready to beg•n work iQ Brluin's former colonies. the intent of the voters could the more 1han 200 island on the project •mmed•atelv ... woutd rnpectfuUy be determined. athletes Panntng 10 partici- People have lost the•r homes suggest that the maturity of - SUipleton prevailed in pate in the Pin American because of the floods. and we our democracy requires that district court and a court· Garnes set 10 start in are tired of band·a1d gesturE-s." we hive our own court of order recount of the ballots Indianapolis Auqust B. According to PubliC Works appe1l, thus removing tho resulted in the defeat of NEW . . . CommiSSIOner James Savage. necassity to go OU1Side of our fa< mer Senator .lime• O'Bry1n, (Continued from ·Page 1) Gov. Alexander Farrelly was :,U:,!ri;:ab::,.fi:'d :~ :.:.g~s:•;~ln=C:::~:t. ~~ areas most affected by there- ::~ou~e ~ro;:;d~~d.p1·1~c~i~ It the summit's or-ning the •ating of democratic organization, which was signed vtew, it is .. high pnOIIty." ceremony. senator David Puritz. ~~~~cJ~~h~~~:~n~r:rive~~~ "The Army Corps of is ·~hi~~:~YPr;~t ~nc~ to lnmcodome:zn:ingth~n t:~:~ ment anencies in two. The new Engineers feels bevery strong Human Services agency, she that there must part•c•pa longer exist side by Side system in the Virgin Islands, said then. will absorb the t•on from the CltiZPns that with independence:· Robinson Stapelton served warning that the project bene'f•ts." sa•d said. 'We must not shirk she will oppose any move previous Communcty ServiceS, Lt. CoL Charles Cox, deputy the responsibility to be final to acquire 10-called "tabu· Community Actton Agency, distrtct engineer tor Puerto arbiters of our own destiny." lators" instead of electronic Youth Services Administration, Rtco and the VIrgin Islands. The prime m1nister met in voting machmes as prov1ded Commission on 'Youth, Com· Among the loc.al senators closed sessions for a second for in the election reform misston on Agmg, Commission who attended the meeting day Tuesday. A press br1efing act of 1984 because the on the Handicapped, Develop· were Douglas Canton. Al1c1a was sct">eduled for late '" the problems of spoiled ballots mental Dcsabtlltles . Council "Chucky" Hanser and Dav•d afternoon. and recounts would still be and Board of Socu~l Welfare Pu1112 The summ1t's fmal com· with U5. Farrelly's off1ccal dtrectl\i': Canton satd the project 1s muniQue was to be tssued on 'With electrontc votcng also established a Board ()f unprecdented, while Hansen Fnday. mach1nes, spoiled ballots Appeals for all welfare pro· commented that .t was a On regional topics, Robin· whtch result tn the dtsen- grams and two advtsory ''positive effort" son said he favored the franchtsement of hundreds ~~act~,·lit~~n ~~~?~·:~~~u~:~ co··1PLEX . . . pollt1cal untfication proposed (and somettmes thousands) (Continut>d from Paat> 1) by the seven-member organtza. of voters and the endless to advocatP the nghts o4 .... uon of Eastern Caribbean recounts and court chal- persons with developmental she sa1d, wants to corJstruct States. lenges would no longer plague disab1lit1es; and an advisory 121 twd-and·three bet! I oom On Tnnidad and Tobago our electoral process," Staple- counc11 on Agcng to prov1de townhousP uncts. w1th a rec· topics, Rob1nson says he ton said. mput on all matters concernmg 1eati._:)n area and a restau.rant. sees no cracks in his ruling In conc~us 1 on, Stapelton tne development of the Tem· The proJeCt 1s planned on 42 Nat10nal Alltance for Recon· said she 1s extremely pleased tor tal plan for the agcf'1q acres o1 h 1Hs 1de property alo11Q struct1on Coalition; his govern· with Senator Puntz's appeals RESIDE:'4TS . , the eastern portion ot Cane ment is consioering divesting court -victory wh1ch she {Continued from Page 1) Bay, accordmg to plans f1ve of Tr;n•dad's approxi· expected all along. And she submitted with the government mately five dozen state in· observed wryly: "If Jimmy handle the amount of water, coastal zone management dustries; 1nd his government O'Bryan had tolloYtled my and the housing development offcce. is commjttltd to diversification advice and run as a Democrat, is built 1n a flood plain. If the project is JPP1oved, away from oil into natur1l gas, he would have been re- Mon Bijou area residents construction WLII start in aericulture, tourism and elected to a •cond term in said they were pteased that January and will take two m1nufecturing. the senate." the flood problem will be years to complete. "We have in mind MW reduced or perhaps eliminated. She said the Antilles (natural g~sl projects we hope HANSEN •; • Delroy Petersen, a re•ident, will come on stream in 1 (Continued from P~e 2) oaid, "I am elated that thi• is matter of two to three years," build in~ but to guide our going to be done. What a I at he said. "We 1re daveiDping school · children. 1 will of Mon Bijou resident> haven't the potential of our II' ,. anempt to correct th1s realized is that the floods have sources in order 1D have I oversight with my legislation, depreciated the value of their smooth 1ransition from concluded Senator Hansen. homes. "1 think this is some· dependence on petroleum, thing that is long overdue. It but not to deptndenar on WOMEN'S • , • . ~ should have been done years gas. (Continued from Page 24) 1g0." .. Our .... t w.kneu • Another resident com- been our dllpend...ce on - men's side has been eliminated. mented that it would be In resource, petroleum," Robin· Australian Peter Doohan - understatement for him to say 10n said. "What we are who uput two-time defending that he was happy for the ~tkin_g ~. do now is to ch1mp Boris Becker last week flood-control project. diwrsofy.... - lost to Slobodan Zivojinovic At leost one peroon, how- Heads of government crf of YugosiiYil in str1ight sets. ever, said that the project 111 13-members of CARICOM Cl S were In ett.ndanoe. OFF1 AL ... Tha members •• Antit111- (Continued from P•e 24) Barbuda, Dominica, Grenada, the policam1n told .,th«i· iMont11rr1t, St. KittJ.Nevis, ties Knight slugged him. St. Lucil, St. Vincent and the Grenadines. Jltnaica, Trinidld· Knight, while in PUino .,d Tobago, Balize, tho Rico, w1s not Ulken into Bahama, Guyen1 and larb• Cllstody and refuud to dit dos. Cllll the matter with IUth«i· -ON- - · ties. He left San Juan It the EDUCA11 • • • end of the P~~r~ American (Colitinued from P• 2) Games oind ratumed to Office (Cruz B1yl Indiana. St. Croix: Curriculum C.n· Two offici1l1 list Friday ter (Kingshilll; Early Child· apposed &~ch I move on the hoOd Office, Dept. of Educe· pen of PUirto Rico's govern- lion Midqulners; Florence A. menF:_-r Gov. Clrlos Willitml LibrlfY (CIIristiln· - .. ~ ntdl; and the Patersen P•"blic Romero Barcalo, in office West End Residents ... CLASSIFIED ADS for the ST. CROIX AVIS are accepte<l at RAINE'S of St. Croix Tradcwinds Building FREDERIKSTED 9:00a.m. -5:30p.m. Mondlly rhru Satwdtly Poge23 Obituary KEITH tHAYNE AN· THONV PE:TERSEN. 18, a 'k,a .,K1ambo." of No.1· 61A Esto.1e Cad1on, died n Friday. J.uw 26th w F u n County Gco1~'" He l!t sur, l'>~·rt b\ot' h1s tathet, Cornt>i; p. t.·• ~~· S1·. a1'rl hcs motnt 1 ~lrlllt"n w\liharns. H1i ~JI<~'II'IIc•lt'L\ts, Hvac11lti1 Willian'::. .,, .. , lima Ctntl on thrt't· ~•stt!r:.. KhadiJJ MJftt,e.-.., Co111~e 4fd Chast1dy Pete• !.C'". ~kn b•othe•s. Kt1•d1l v..,111Jms. Co•nel J• .. Co1ey. Cal .... m Cca•g, Co• dell ana CJ,ff Pete1· sen: two Junts. 1'-.ngeta N•el· sen and llmJ ftan .... ~. !,\1'€ .1ncles, James Peterst"n, .Jctave, Oscar. Gerald and Glenn Wtlltams. numerous great aunts and g1 eat uncles; other rPI attves and tnends. Funeral serv1ces will take place at Holy Tnnlty Luthe· ran Church on Thursday. July 2nd, at 2 p.m. Interment will folloVv en the Freder1k· sted Cemetery. Funeral an angements are by James ~ 1 ron1nnal Funeral Home Inc Investment G• oup has planned "the prOJeCt wcth our ears open tn an attempt to allay the fears" of establiShed Cane Bay and nearby La Vallee rescdents "I thcnk people feat that a development such as thts bL•dt near them m1ght cause d•s· placement because of mflated property values," Ms Bastress sa1d. "This ts becom1ng an 1Ssue surrounding all devplop- ment tn the V1rgin Islands." The Antilles Investment Corporation also operates Schooner Bay and Colony Cove Condominium com· JMexes on St. Croix. Thursday. 111/y 2 · ORIENTAl !loiGHT Saturday. July 4- BEACH BARBECl E & FIREWORKS Resrn·ations sut(~C'S1t·d SUNDAY BRliNCH 11:30 e.m. ·2:30p.m. 772.0100 1'11t- M001fAArt.lt ~~ Live Entertainment You~ n•w holla, Marty 6 Gna Abbott PftHnt S1'!:VE GUTH· RJI! MoD •• PETER 6 EILEEN T.u •• THE SNOWS. wttb the but .-u., Nualc on St. X WM. • Sat .• 6 o,_ Mike Sun. 43A Q&IU" C.rou S-J~35 ,, lhf' Lndu not•l