Letter regarding enclosed correspondence discussing relocation of pumping tests and Fig. 1 Pumping Test Piping Layout
UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION II JACOB K. JAVITS FEDERAL BUILDING NEW YORK. NEW YORK 1O278 OCT I 11992 Via Facsimile John K. Dema, Esq. Law Offices of John K. Dema, P.C. 42-43 Strand Street Christiansted, St. Croix USVI 00820 Dear Mr. Dema: As discussed with you on October 27, 1992, as part of the Remedial Investigation, a pumping test will be conducted on some of the monitoring wells in the Tutu area. The TEIC has proposed to use two other wells in your property to obtain water-level measurements. This will provide better data for evaluation of aquifer hydraulic properties. Enclosed please find correspondence (10/22 and 10/23) between Geraghty & Miller, Inc. and me. These correspondence reflected the changes to the March 1992 Workplan and the locations of the two wells that TEIC would like to use for their measurements. I understand from our discussion that you are conducting a similar test with your wells and that you would like to utilize the same wells that Geraghty & Miller, Inc. are using. …
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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION II JACOB K. JAVITS FEDERAL BUILDING NEW YORK. NEW YORK 1O278 OCT I 11992 Via Facsimile John K. Dema, Esq. Law Offices of John K. Dema, P.C. 42-43 Strand Street Christiansted, St. Croix USVI 00820 Dear Mr. Dema: As discussed with you on October 27, 1992, as part of the Remedial Investigation, a pumping test will be conducted on some of the monitoring wells in the Tutu area. The TEIC has proposed to use two other wells in your property to obtain water-level measurements. This will provide better data for evaluation of aquifer hydraulic properties. Enclosed please find correspondence (10/22 and 10/23) between Geraghty & Miller, Inc. and me. These correspondence reflected the changes to the March 1992 Workplan and the locations of the two wells that TEIC would like to use for their measurements. I understand from our discussion that you are conducting a similar test with your wells and that you would like to utilize the same wells that Geraghty & Miller, Inc. are using. I spoke with Anna Gloria, Project Coordinator of TEIC and Thomas Danahy, Project Manager for Geraghty & Miller, Inc. They would like you to provide a schedule with date and types of activities similar to the one they provided me (see 10/20 letter). This is to ensure they have someone on site to provide access to you on these wells for your pumping test. TUT OO7 1156 PRINTED ON RECYCLED PAPER *64969* 64969 Q CHT-6D FOUR WINDS SHOPPING CENTER B-8 r—i r — L- — » \ L-——1 FOUR WINDS TREATMENT / SYSTEM x LEGEND SOIL BORING § a. C>4 CN < O © SHALLOW MONITORING WELL A DEEPER MONITORING WELL • EXISTING SUPPLY WELL ,-> THESE ARE MONITORING WELLS INSTALLED BY CARRIBEAN HYDRO-TECH, INC (LOCATIONS APPROXIMATE) SCALE (APPROXIMATE) 0 100 FEET GERAGHTY & MILLER, INC. Environmental Services PUMPING TEST PIPING LAYOUT TUTU SERVICE STATION INVESTIGATION ST. THOMAS, U.S. VIRGIN ISLANDS FIGURE 1 TUT 1151 Table 1. Anticipated Schedule for Pumping Tests in October and November 1992, Tutu Service Station Investigation, St. Thomas, U.S. Virgin Islands. Date Activity Thursday, October 29 Friday, October 30 Monday, November 2 @ 10:00 a.m. Thursday, November 5 @ 10:00 a.m. Friday, November 6 Monday, November 9 @ 10:00 a.m. Tuesday, November 10 @ 10:00 a.m. Set—up water—level recorders for pre—pumping trend. 4-hour step-test at MW-6D; record recovery. Set-up recorder for pre-pumping trend for November 2 test Start 72—hour pumping test at MW—6D; pumping rate to be determined from the resultfof October 30 step-test. End test; record recovery; data analysis. 4-hour step-test at MW—6R; record recovery. Set—up recorder for pre—pumping trend for November 9 pumping test. Start 24-hour pump test at MW-6R; pumping rate to be determined from November 6 step—test. End test; record recovery. PR01301 - #3/91492tbl.wk3 'TUT OO7 GERAGHTY & MILLER. INC. GERAGHTY '& MILLER, INC. Environmental Services Ground Water Engineering Hydrocarbon October 23, 1992 Remediation Education Caroline Kwan, Project Manager USEPA - Region II 26 Federal Plaza, Room 737 New York, New York 10278 Re: Four Winds Plaza Monitoring Well Access Tutu Service Station Investigation St. Thomas, U.S. Virgin Islands Dear Mr. Kwan: As we discussed in our recent telephone conversation, Geraghty & Miller, Inc. is interested in receiving access to the monitoring wells installed by Caribbean Hydro-Tech, Inc. (CHT) at Four Winds Plaza (see Figure 1) for the upcoming pumping tests. Although it is not required to monitor these wells in the Tutu Service Station Investigation Work Plan prepared by Geraghty & Miller, Inc., March 1992, they will provide more water-level measuring points. Using more measuring points will provide better data for evaluation of aquifer hydraulic properties. The proximity of Monitoring Well CHT-6D and CHT-4 to the proposed pumping wells (i.e., MW-6 and MW-6D) would provide an excellent addition to the data. \ Geraghty & Miller appreciates your help in gaining access to these wells. If you have any questions, please call. (jfi^i/l**-? Sincerely, -r*] GERAGHTY & MILLER, INC. Clinton Moffatt Staff Scientist I/, J JThomas V. Danahv /y enior Scientist/Project Manag^x c: Ana Gloria Ramos - TEIC CM:cmw #PR01301-wp3/102192.1tr Vice President/Project Officer TUT OO7 115': 201 West Passaic Street, 3rd Floor • Rochelle Park, New Jersey 07662-(201) 909-0700* FAX (201) 909-0567/0568 Please call me or Anna Gloria Ramos if you have any questions. I can be reached at (212) 264-0151. Thank you for your advance cooperation. Sincerely yours, Caroline Kwan Project Manager New York/Caribbean Superfund Branch II Enclosures cc: Andy Praschak- EPA/CFO Thomas Danahy- G&M Anna Ramos- TEIC TUT 00V J.60 GERAGHTY & MILLER, INC. plotted for review by USEPA representatives prior to deciding when to end the test. If you have any questions, please call. c: Ana Gloria Ramos - TEIC Jose Agrelot - Soil Tech Sally Odland - CDM CM:cmw #PR01301-wp3/101392.LTR Sincerely, GERAGHTY & MILLER, INC. Clinton Moffatt Staff Scientist Thomas V. Danahy Senior Scientist/Pro (I Manager . / Daniel A. Nachman Project Director/Proj ct Officer TUT 007 1161 ^WGERAGHTY f& MILLER, INC. Environmental Services Ground Water Engineering Hydrocarbon Remediation Education October 20, 1992 Ms. Caroline Kwan, Project Manager USEPA-Region II 26 Federal Plaza, Room 737 New York, NY 10278 Re: Relocation of Pumping Tests and Revised Schedule Tutu Service Station Investigation St. Thomas, U.S. Virgin Islands Dear Ms. Kwan: Based on information collected from the first round of ground-water sampling of the monitoring wells, Geraghty & Miller, Inc. has decided to relocate the upcoming pumping tests from MW-10 and MW-10D to MW-6R and MW-6D. During the purging of MW-10, the well was pumped dry within 12 minutes at a rate of 2 gallons per minute (gpm) and MW-10D was pumped dry within 25 minutes at a rate of 8 gpm. In comparison, MW-6R and MW-6D maintained a flow rate of 4 gpm and 8 gpm, respectively, therefore providing a sufficient yield for the pumping tests. £•.! Table 1 presents an update of the preliminary schedule for the pumping tests. As 4 requested by the USEPA and agreed to by Ana Gloria Ramos, Designated Coordinator, Tutu Environmental Investigation Committee, the current schedule includes an extension of the o :-.w: pumping test at the deep monitoring well (MW-6D) to possibly 72 hours, in order to allow for stabilization after potential delayed yield. The 72-hour pumping test will be stopped after 24 or ti 48 hours if the data indicates that a delayed yield is not still present. The field data will be 201 West Passaic Street, 3rd Floor• Rochelle Park, New Jersey 07662'(201) 909-0700-FAX (201) 909-0567/0568