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Erler & Kalinowski, Inc. TECHNICAL MEMORANDUM 1 Basis of Design for the Groundwater and Soils Remediation Source Control Program Texaco Tutu Service Station, St Thomas, U.S. Virgin Islands 26 June 1995 (EKI 940058.03) TUT GO8 O31 *65038* 65038 Erler & Kalinowski, Inc. TECHNICAL MEMORANDUM 1 Basis of Design for the Groundwater and Soils Remediation Source Control Program TABLE OF CONTENTS SECTION A - INTRODUCTION............................................................................................... A.1 SECTION B - SOIL VAPOR EXTRACTION SYSTEM.......................................................... B-1.1 B-1. Remedial Action Objectives for Vadose Zone Soils................................................... B-1.1 B-2. Service Station Site SVE System Design Summary................................................. B-2.1 B-3. SVE System Treatment Criteria................................................................................ B-3.1 B-3.1 Assumed Concentrations of Chemicals in the Extracted Soil Vapor..................... B-3.1 B-3.2 Air Emissions - Service Station Site.................................................................... B-3.1 B-3.3 Catalytic Oxidation Treatment............................................................................. B-3.3 B-4. Performance Monitoring........................................................................................... B-4.1 B-4.1 Soil Vapor Sampling ........................................................................................... B-4.1 B-4.2 SVE Well Vacuum Testing................................................................................... B-4.1 B-4.3 Completion of SVE Remedial Action................................................................... B-4.2 B-5. System Operation..................................................................................................... B-5.1 B-5.1 Expected Operations Schedule........................................................................... B-5.1 B-5.2 Instrumentation and Control................................................................................ B-5.1 B-6. Contingencies........................................................................................................... B-6.1 B-6.1 Vacuum Adjustment / Additional Wells................................................................ B-6.1 SECTION C - GROUNDWATER EXTRACTION SYSTEMS................................................. C-1.1 C-1. Remedial Goals......................................................................................................... C-1.1 C-2. Volume of Groundwater to be Remediated................................................................ C-2.1 C-3. Treatment Criteria.................................................................................................... C-3.1 C-3.1 Assumed Groundwater Influent Concentrations................................................... C-3.1 C-3.2 TPDES Discharge Requirements........................................................................ C-3.1 C-3.3 Treatment of Air Discharged from the Air-Stripper by the Catalytic Oxidizer....... C-3.1 C-3.4 Estimated Air Emissions ..................................................................................... C-3.2 C-4. Performance Monitoring............................................................................................ C-4.1 C-5. System Operation .................................................................................................... C-5.1 C-5.1 Expected Operations Schedule........................................................................... C-5.1 C-5.2 Instrumentation and Control................................................................................ C-5.1 C-6. Contingencies..........................................................................................................C-6.1 C-6.1 Achievement of Hydraulic Capture...................................................................... C-6.1 C-6.2 Achievement of Remedial Goals.......................................................................... C-6.1 C-6.3 Limiting Perturbation of Suspected DNAPL Near the Curriculum Center..............C-6.1 /—s TUT OO8 O31A (EKI 940058.03) Erler & Kalinowski, Inc. SECTION D - ADDITIONAL INVESTIGATIONS...................................................................... D.1 D-1. Chemical Data for Soil on the Service Station Site.......................................................D.1 D-2.LNAPL Evaluation........................................................................................................ D.1 SECTION E - IMPLEMENTATION AND SCHEDULE........................................................... E-1.1 E-1 Conceptual Design....................................................................................................E-1.1 E-2 Design and Construction Concept.............................................................................. E-2.1 E-3 Documents to be Transmitted to EPA and DPNR...................................................... E-3.1 E-4 Schedule...................................................................................................................E-4.1 REFERENCES..................................................................................................................... E-4.2 (EKI 940058.03) Erler & Kalinowski, Inc. SECTION A - INTRODUCTION Gasoline constituents have been released to the subsurface in the vicinity of Texaco Tutu Service Station, St. Thomas, U.S. Virgin Islands (GCL, 1994; Geraghty & Miller, 1995a). In a 13 April 1995 document titled "Groundwater and Soils Remediation Program for Texaco Service Station, St. Thomas, U.S. Virgin Islands" (Erler & Kalinowski, Inc., 1995) ("April Report"), Texaco Caribbean Inc. (TCI") proposed a conceptual design for soils and groundwater remediation program. The primary objectives of the proposed site soils and groundwater remediation program are to: • remove free-phase petroleum hydrocarbons (light non-aqueous phase liquid, "LNAPL"), if present, • control and remediate groundwater with elevated concentrations of petroleum hydrocarbons in the vicinity of the site, • remediate unsaturated soil and rock that may be affected petroleum hydrocarbons beneath the site, and • control further migration of the petroleum hydrocarbon plume down-gradient of the site. The TCI remediation program is planned for two locations: the Texaco Service Station Site itself ("Service Station Site") and the Vitelco Property ("Vitelco Site"), downgradient of the Service Station Site. The planned remedial action at the Service Station Site consists of construction of a soil vapor extraction system coupled with a groundwater extraction and treatment system. The remedial action at the Vitelco Site consists of construction of a groundwater extraction and treatment system. The purpose of this Technical Memorandum 1 ("Tech Memo 1") is to provide to the regulatory agencies, U.S. EPA ("EPA") and the U.S. Virgin Islands Department of Planning and Natural Resources ("DPNR"), additional information regarding the basis for the design of the groundwater and soil remedial systems to be constructed at the Service Station and Vitelco Sites. Tech Memo 1 is divided into five sections. This Introduction is Section A. Section B provides additional information regarding the proposed soil vapor extraction system at the Service Station Site. Section C provides additional information regarding the proposed groundwater extraction systems at both the A.1 Section A (EKI 940058.03) Erler & Kalinowski, Inc. Service Station and Vitelco Sites. Section D discusses potential additional investigations at both sites, and Section E presents the plan for implementing the project and the proposed schedule at both sites. Numbered Sub Sections within each Section address discrete issues that require additional discussion. Back-up materials (e.g., figures, tables, specifications, calculations) are included at the back of each Sub Section for ease of review. Ti IT i">O8 A.2 ' J Section A (EK1 940058.03) B Erler & Kalinowski, Inc. SECTION B - SOIL VAPOR EXTRACTION SYSTEM B-1. Remedial Action Objectives for Vadose Zone Soils The overall remedial action objectives for vadose zone soil impacted by petroleum hydrocarbons at the Service Station Site are to protect human health and the environment by: 1) limiting direct exposure to impacted soils, and 2) limiting the potential for migration of the petroleum hydrocarbons from the soil to the groundwater. To meet these objectives, a soil vapor extraction ("S VE") system is being constructed to extract, to the extent practicable, petroleum hydrocarbons from the vadose zone soil. It is intended that the SVE system be operated until evaluation of performance criteria indicates that mass removal of petroleum hydrocarbons is no longer significant. It is proposed that the mass removal rate of petroleum hydrocarbons will be considered no longer significant when any one of the three following alternative performance standards is satisfied: 1 ) Three sets of extracted gas concentration monitoring results show that all of the three following criteria are met: a) the extracted gas concentration of petroleum hydrocarbons is less than ten (10%) of its value at the time of startup or less than the Practical Quantitation Limit ("PQL"), whichever is greater; and b) the extracted gas concentration of petroleum hydrocarbons, in the most recent year of operation, has been reduced by less than ten percent (10%) of its value at the start of the year, or is less than the PQL, whichever is greater; and c) the total aggregate removal rate for the petroleum hydrocarbons is less than three (3) pounds per day per 100 standard cubic feet per minute ("SCFM") of vapor removed. 2) Three sets of extracted gas concentration monitoring results, at intervals established in the approved Monitoring Plan, show that the extracted gas concentration of petroleum hydrocarbons is less than one percent (1 %) of its value at the time of startup or less than the PQL, whichever is greater. TTUT OOB 03: B-1.1 Section B (EKI 940058.03) Erler & Kalinowski, Inc. 3) Three years of SVE system operation have been completed and three sets of extracted gas concentration monitoring results, at intervals established in the approved Monitoring Plan, show that the extracted gas concentration of petroleum hydrocarbons is less than ten percent (10%) of its value at the time of startup or less than the PQL, whichever is greater. B-1.2 Section B (EKI 940058.03) -ic o CO Erler& Kalinowski, Inc. B-2. Service Station Site SVE System Design Summary The Service Station Site SVE system will consist of three soil vapor extraction wells (including existing well TT-4), new monitoring points, and a soil vapor treatment unit. The locations of well TT-4, the two proposed extraction wells, and the containerized treatment system are shown on Figure B-2.1. The catalytic oxidizer vapor treatment unit within the containerized treatment system is designed to also treat air discharged from the groundwater air stripper (see Section C). Discussed below are the design parameters for the Service Station Site soil vapor extraction system. B-2.1 Well TT-4 Existing vadose zone well TT-4 is located within a fuel tank excavation backfilled with gravely clay (See monitoring well construction log at the back of Sub Section B-2). The existing wellhead will provided with a seal to limit potential short-circuiting. B-2.2 Proposed Vapor Extraction Wells and Monitoring Points The two new SVE wells (VE-2 and VE-3) will be 6 inches in diameter, and approximately 20 feet deep, and screened from approximately 4 to 16 feet below the ground surface ("fags"). The annular space between the blank casing and the bore hole down to a depth of 4 feet will be sealed with bentonite. The zone from 16 to 20 feet bgs, with blank casing, will be a sump for possible future installation of a seepage pump. New monitoring points will be installed on a radial line at approximately 10 foot intervals from the proposed SVE wells to assess the zones of influence of each of the SVE wells. Monitoring points well be constructed by first core-drilling the pavement, then driving 1/4 inch interior diameter steel casings into the subsurface soils to a depth of about 3 feet. These temporary monitoring points will be equipped with a vacuum gauge or water column to measure subsurface vacuum. Monitoring point locations will be determined in the field. At monitoring points not indicating a subsurface vacuum, a vapor sample will be extracted if possible and screened with a PID for volatile organics as an indication of the possible presence chemicals of concern in the subsurface. TUT 008 O326 B-2.1 Section B (EM 940058.03) Erler & Kalinowski, Inc. B-2.3 SVE System Capacity As described in the April report, and based on existing monitoring well construction logs for wells TT-4 and TT-1, the subsurface soils consist of clays and weathered bedrock. (See lithologic descriptions on monitoring well construction logs, included at the back of Section B-2.) Based on past experience with similar soils, it is anticipated that each of the vapor extraction wells will have a radius of influence of approximately 20 feet at an applied vacuum of six (6) inches of mercury and vapor flow rate of 10 - 15 standard cubic feet per minute ("scfm") per well. Therefore, the total flowrate from the SVE system is estimated to be 30 to 45 scfm. As a result of the applied vacuum from the SVE system, the groundwater elevation in the wells is anticipated to rise 6 to 7 feet. However, this rise is expected to be counteracted by the effects of groundwater pumping from the planned groundwater extraction wells. Modeling of the groundwater extraction system suggests that the expected drawdown due to pumping of groundwater will be 6 to 7 feet. (For additional discussion of the groundwater modeling, see Section C-2.) Therefore, the net effect is that the groundwater surface is expected to remain near its pre-pumping elevation. B-2.4 Vapor Treatment Unit Soil vapor extracted from the SVE wells will be treated by a catalytic oxidizer to control emissions of chemicals of concern; air discharged from the air stripper will also be treated by the catalytic oxidizer. (See Section C for a discussion of the groundwater extraction and treatment system.) The catalytic oxidizer is designed with a total capacity of 1,000 scfm of which 100 scfm has been allocated for the treatment of soil vapor from the SVE system. (See Sub Section B-3.2 for discussion of effluent from the catalytic oxidizer.) TUT OOrf B-2.2 Section B (EKI 940058.03) EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE B-2.1 GROUNDWATER AND SOIL REMEDIATION SYSTEMS SITE LAYOUT TEXACO TUTU SERVICE STATION (Page: TUT 008 0328) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 I I " £xt"€?\(<46, MOWITDIW.U* W£u, ^aa*»n*x/c.-no^ i~o^,^ ./-L —•^ LTTHCLOOCLOC "•LOCATION S.IAP: .„..,„ t r_ _ i ^i tj OFFICE ^ •rr-4 ,t/+ „_!/* „.!/<• LOCATION DESCRIPTION: ~5~ e T ••MW • 5- •to •15' •20 •25 •30 .4Q, .45 •50 WELL XJNST. 4' PVC BLAM< B ^= = m =§ m 4' .030- SLOT PVC M UTH. i/* S Lea [ SfTE 1 STTE ' N ———— - \at GRO ft STAT PUMPS [1 ORR. r~^~] ORH. 1 ——— 1 DATE ———————— RELJ UCUTTNGS) - Pqee i _ of t IB- TEXACp TUTU i nrATinw m- TT— 4. COORDINATES (ft.): JND FtFVATinN /». USt> T- ST. THOMAS CMMNTY- U.S.V.I. INK: uPTwnn- AIR ROTARY/HAMMER UN<? tyjitnt • CARR'IB^EAN HYDRO— TECH " gfAflnrn.- 12/2/93 ITATF CQUPLe"P!T> 12/3/9!} 7 PCTI' MA^ygLO/MONTANO _ r R UOMUUII* ——————————————————————————————— CE^JTEr? OF UST PIT AREA VISUAL H l 1 ii=i=§E==S~T7 • .. • « **—• i i ^."".^ST^ , i ! 1 i 44 \ i i { t i i i i i i i i i t t i 1 g-T— r^r* i i i 1 I i fe/fe/^5 : " ^_?i^ ! j 1 ! y*" (jy^_. / 1 ! i ?$*/9 1 I ; i i i iiii : i i i i i i i i i .1 i : ! i i 1 - — ^ ^ ' '• i i i • » > * • • "<.•*('" fc 1 1*^ r ' •%/"* "^ * fw *( ** ' i* **f ^ <. T "• ^» : ' l i i 1 1 1 1 i 1 1 1 1 i 1 i ', 1 1 1 1 1 | 1 1 | I I 1 1 t 1 1 1 1 i iiii i ii i 1 ! 1 1 | 1 1 1 ! • i iiiii ii i ii i i tiii i i t i i i ii i t tii i 1 i i i i t t i iii i li I t iii 1ii i ! ! 1 i | 1 t 1 | 1I 1 1 1 1 1 | 1 1 1 1 ! 1 l j i 1 1 1 1 1 1 i 1 i 1 tii iil i i 1 1 1 i 1 1 l 1 1 1 SAMPLE TYPE -HEAD- SPACE -PHI SPACE 1 NTERVAL 31X0 pon 22.0 ppn L&O pon UTHOLOOC OESCRIPTtON (UTH.. GRAIN SIZE PROPORTIONS. WET COLOR. RNOC., SRTG.. CONSO(_ OIST. FEATURES) 00-05 CONCRETE 05-9.0 CLAYEY FILL * DARK GRAY TO GREENISH- GRAY CSG 4/U GRAVELLY OJP TO 4C», M01ERATELY PLASTIC CLAY, WITH LOCALLY MODERATE HEAVY-OIL aUOR- 9.0-16J WEATHERED BEDROCK ='3A«K GREENISH-GRAY CSG 4/U ANDES1TE BRECCIA. WITH DARK GREENISH-GRAY CLAY FILLING INTERSTICES. 1&5-36.0 VOLCANIC BRECCIA = DARK GREENISH-GRAY CSG •*./!> AUGITE-ANDESITE BRECCIA, WITH SPORADIC BIKES OR INCLUSIONS OF BLACX <5G 2/U BASALT BRECCW. FRACTURES NOTEABLE NEAR 36-27 FT. AND SOFT WEATHERED ZONE NEAR 33 FT. TTJ a 36.0 FT. B/SCREEN s 89^ FT. INITIAL WATER LEVEL » 13.73 FT. BGL TUT OOB 0329 —— JX J.TWH LTTHOLOGJC LOG UAP- > -T- -i- -r arncE ft , (CUTTNGS) snr m- TEXACO TUTU mri-now in- TT-I F ""' <& SITE COORQINArES (ft): DIESEL, I PUMP jgggj a V TT-I o • TT-UJ PUMPS RT 39 1/4 LOCATION T T H • 5- • • •10- -15 •20 •25- •30- •35 •40 •45 •50 WELL CONST 4* PVC BLAM< m m 4' .010- SLQT PVC := ^= i"™" WDUNO ELS^*™?" (ft- «st> STAT OPJL ORIL DATE FtEU ~~ COM F- ST. THOMAS f?nilNTY- U.S.V.l. IMft ItfTKrtfV AIR ROTARY/HAMMER .INC CQMTW • CARRI8EAN HYDRO— TECH ' STAHTTga; 12/8/93 QATg gntiPI enm- 12/8/93 T BPP- MAZZULLO/ MONTANO UPMT?. _!/* I/* i/» 3 ——— i ——— n —— . nc^.-wpTtrtw SOUTH END OF STATION ALONG CURB. 5 FT. WEST OF TT-10 . UTH. VISUAL * *"-• "* < - ——— — -. , —____-. | • *^ _«• t •Sz^jSS — i —— »'. •"-""••ry i • 1,1 • • ^ • a i - -• i.^r^"J) i •^-"•.^f^ • , « ,* *J • ,*-i! 1 V i » . 1 1 —./^) ^ 1 f^sf (3 1 i 14;~>^, — j ; fc— i</ 3,1 i =*-<<"' ' i • <- , •• -j ." •* i. •* I i "•i sf \ i i --'{--•' !, - > 4 «• t *• <F^* ' '-"*! * - <^ * 4 1 'i >^t.*^ \ • i. _ T^ » ^ 1 ". » !• T « M _ V - - ' I ; -T. -"-' > * • * * - * ! • M . • *(['* > * 1 ir i ! iiiiiii i T™ i < iii i i t ti i i | J iiii i i i i i i 1i i i i i t i ! ! '< SAUPtjE TYPE ' PID — HEAD- ' SPACE ; -HEAD- SPACE — HEAD- • SPACE f-PID —PID --PID - PID —PID "PID NTERVAL 5 ppn 94 ppn 48 ppn 19 ppn 7 ppn 16 ppn 121 ppn 24 ppn 6 ppn 5 ppn UTHOLOGtC DESCRIPTION (UTH.. GRAIN SIZE PROPORTIONS. WET COLOR. RNOG.. SRTG^ CONSOU OlST. FEATURES) OJJ-05 CEMENT OS-SJJ CLAY a MODERATE GREENISH-GRAY <3B 5/D, MODERATE PLASTICITY, SANDY TO PS3BLY <2t)-25X>. WITH MILD WASTE OIL OBOR. 3J-7J CLAY = OLIVE-GRAY C5Y 4/u, MODERATE PLASTICITY, SANDY cio-is*/o WITH SOME LARGER ROCKS AND TREE -ROOTS. 7.5-15.0 PE3BLY CLAY - GRAY-GREEN C5G */\\ MODERATE PLASTICITY, 15-20% ?£3BLES CLOCALLY HIGHER PROPaRHON). 15.0-2LO WEATHERED BEDROCK = DARK GREENISH- GRAY CSG 4/l>, ALTERED ANDESITE AND BASALT BRECCIA. WITH INTERSTITIAL CLAY. ai.0-36.3 VOLCANIC BRECCIA = FRACTURED, BLACK CSG a/u, BASALT BRECCIA, OOWN TO FRACTURED. DARK GREENISH-GRAY CSG */ix AUGITE-ANDESITE BRECCIA. SLIGHT GASOLINE ODOR TOWARDS BOTTOM. TO » 36.3 FT. B/SCREEN = 30 FT. INITIAL WATER LEVEL = iE.45 FT. BGL • TUT OO8 O33O CO Erler & Kalinowski, Inc. B-3. SVE System Treatment Criteria The design of the catalytic oxidizer unit is based upon the parameters discussed below. B-3.1 Assumed Concentrations of Chemicals in the Extracted Soil Vapor Due to the limited number of subsurface samples that have been collected and tested, there is some uncertainty whether the available soil data are fully representative of the concentrations of volatile chemicals in the vadose zone. Therefore, the concentrations of chemicals in groundwater were used to estimate the concentrations of chemicals in the extracted soil vapor. The chemical concentrations in the extracted soil vapor were estimated by converting the highest reported groundwater concentrations, in parts per million (ppm), from the former underground storage tank area to vapor phase concentrations in parts per million by volume (ppmv). The vapor phase concentrations were then converted to the mass of chemicals removed on a daily basis by assuming an air flow rate of 10 scfm for each SVE well. Table B-3.1 shows these concentrations and estimated mass removal rates for each chemical of concern. A calculation sheet showing the specific calculation for benzene is included at the back of Sub Section B-3. The concentrations of each of the chemicals of concern shown in Table B-3.1 were used as the basis for determining the design parameters for soil vapor influent into the catalytic oxidizer (described in Section B-3.3). In addition, groundwater off-gas will enter the catalytic oxidizer. The estimated vapor concentrations from the groundwater off-gas, the SVE system, and total estimated vapor concentrations in the catalytic oxidizer influent are shown in Tables B-3.2 and B-3.2A. The determination of the required destruction efficiency of the catalytic oxidizer is described in Section B-3.2. B-3.2 Air Emissions - Service Station Site Based on discussions with the DPNR, air discharge limits or permitting requirements have not been promulgated for remediation facilities for the U.S. Virgin Islands. Air emissions of benzene, 1,2-dichloroethane, trichloroethene, tetrachloroethene, vinyl chloride and methylene chloride are of potential concern because these chemicals have been identified as human carcinogens (Class A) or probable human carcinogens (Class B2) (EPA, 1994). ERA uses a general risk range of 10"4 to 10"6 (the probability that an individual will contract cancer over a 70 year lifetime due to exposure to chemicals of concern) as an acceptable "target range" for cleanup (EPA, 1990). Table B-3.3 (revised from Table 5, page 1, in the April Report) shows estimated air emissions of these chemicals of concern, catalytic oxidation destruction efficiencies, estimated B-3.1 TUT °09 Section B (EK1 940058.03) ,*•—s Erler & Kalinowski, Inc. treated air emissions and estimated hydrochloric acid emissions following catalytic oxidation destruction at the Service Station Site. The catalytic oxidizer destruction efficiencies specified for the unit that will be manufactured specifically for the Service Station Site are based on typical, achievable destruction efficiencies for catalytic oxidizers. The catalytic oxidizer specifications are included in this Sub Section. As discussed below, the catalytic oxidizer will produce air emissions that are expected to be in the risk range of 10"6. Hydrochloric acid (HCI) will be formed as a result of the destruction of chlorinated VOCs. Estimated emissions of HCI are calculated to be on the order of 3 Ib/day. The risk screening analysis method used for the Service Station Site is based on the ERA Risk Assessment Guidance for Superfund (EPA, 1989) and EPA's Supplemental Guidance entitled "Standard Default Exposure Factors" (EPA, 1991). Three populations are considered in the evaluation of estimated incremental lifetime cancer risk due to inhalation of chemicals of concern emitted from the remediation system: 1) on-site employee risk; 2) off-site resident risk; and 3) off-site school student risk. Summary Table B-3.4, Detailed Risk Analysis Tables B-3.5 through B-3.8, EPA guidance formulas, back-up calculations, air simulation assumptions, and an EPA approved air dispersion model (SCREEN2, 1993) output are included in this Sub Section. Results of the risk analysis for EPA carcinogens are described below. At the Service Station Site, benzene emissions from the soil vapor extraction system and the groundwater treatment system, without emissions control, are estimated to be on the order of up to 15 Ib/day. Due to this potentially significant mass, air emissions treatment by catalytic oxidation has been included in the remedial design for this location. A risk screening analysis was completed to estimate the incremental potential lifetime cancer risk due to exposure to treated air emissions from the Service Station Site remediation system. Based on estimated air emission rates and the results of emission scenarios calculated from the SCREEN2 simulation, health risk analyses were completed for on-site employees, off-site residents, and off- site school students due to exposure to the maximum calculated concentration at ground level. The estimated incremental lifetime cancer risk for on-site employees at the Service Station Site, assuming a 25 year exposure duration, is estimated to be 1.0 x 10"6. For off-site residents, the incremental lifetime cancer risk, assuming a 30 year exposure duration, is estimated to be 5.0 x 10~ 7. The estimated TUT OQ8 033; B-3.2 Section B (EKI 940058.03) Erler & Kalinowski, Inc. '"•"•N incremental lifetime cancer risk for off-site students, assuming an 8 year exposure duration, is estimated to be 4.0 x 10"8. The risks are weighted toward the assumed benzene and vinyl chloride emissions. In response to a comment from ERA, an additional analysis was completed to look at the potential effects on risk due to hypothetical higher, simultaneous vinyl chloride and benzene levels. Table B-3.6 shows the sensitivity of the risk analysis to these elevated concentrations. If the vinyl chloride emission rate increased to 2.7 x 10"4 g/s (increasing the influent concentration to approximately 2 ppm from the assumed 100 ppb) and the benzene emission rate increased to 1.3 x 10"3g/s (doubling the groundwater influent concentration to 34 ppm from the assumed 17 ppm) the estimated incremental lifetime cancer risk would be 5.0 x 10"6 for on-site employees assuming a 25 year exposure duration and 2.0 x 10"6 for on-site employees assuming a 10 year exposure duration. The long term analyses may be conservative inasmuch as the exposure durations of 25 years for on-site employees, and 30 years for off-site residents are likely two to three times the probable operational life of the remediation system. In addition, chemical concentrations from the soil vapor extraction system are expected to significantly decline within a few years. f \ Therefore, it can be assumed that with the specified catalytic oxidizer destruction efficiencies, the conservative exposure durations used, and the expected reduction of chemicals from the soil vapor extraction sytem, there is adequate flexibility in the system to treat higher than assumed influent concentrations without increasing the estimated incremental lifetime cancer risk above 10"6. B-3.3 Catalytic Oxidation Treatment Based on the air emmisions and the risk analysis described in Section B-3.2 and typical catalytic oxidizer destruction efficiencies, the catalytic oxidizer has been specified to have a destruction efficiency for BTEX compounds of 99% and a destruction efficiency of 96% for the chlorinated VOCs. The technical specifications for the catalytic oxidizer are included at the end of this section. Based on an air discharge rate of 900 scfm from the air stripper and an estimated maximum soil vapor extraction rate of 100 scfm, it was determined that the catalytic oxidizer should have an air flow capacity of 1000 scfm. —, TUT O08 O334 B-3.3 Section B (EKI 940058.03) TABLE B-3.1 TEXACO SERVICE STATION SOILS VAPOR PHASE CONCENTRATIONS Texaco Tutu Seivice Station (EKI 940058.03) CHEMICALS OF CONCERN Benzene Toluene Ethylbenzene Xylene 1 ,2-Dichloroethane (DCA) 1 ,2-Dichloroethene (DCE) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Methylene Chloride Cone H20 ppm 23 25 4 18 0.3 0.7 0.06 0.05 0.06 7 MW 78 92 106 106 99 97 166 131 63 84.93 Kh 5.48E-03 6.74E-03 8.68E-03 6.30E-03 9.10E-04 9.38E-03 2.87E-03 9.90E-03 5.60E-02 2.00E-03 Vapor Cone ppmv 1616 1832 328 1070 3 68 1 4 53 165 Design Vapor Cone Ib/day 5 6 1 4 0.01 0.25 0.01 0.02 0.1 1 MW = Molecular weight Kh = Henry's constant Assumptions: 1. Estimate chemical concentrations in soil based on the highest groundwater concentrations found in the former underground storage tank area. 2. Assume equilibrium conditions for calculating Ib/day based on 10 scfm. (EKI 940058.03) SOILST1.XLS 0/ x x 7- 7 /AW EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE B-3.2 TEXACO TUTU SERVICE STATION ORGANIC CONCENTRATIONS: GROUNDWATER & VAPOR PHASE (1) (Page: TUT 008 0337) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE B-3.2A TEXACO TUTU SERVICE STATION ORGANIC CONCENTRATIONS: GROUNDWATER & VAPOR PHASE (1) (Page: TUT 008 0337) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 TABLE B-3.3 ESTIMATED AIR EMISSIONS Texaco Tutu, U.S. Virgin Islands (EKI 940058.03) CHEMICALS OF CONCERN Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (DCA) 1,2-Dichloroethene (DCE) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl Chloride Methylene Chloride TEXACO TUTU SERVICE STATION with Emissions Control (1) Mass in Air Air Stripper Ib/day (2) 10 9 2 8 0.2 0.3 0.03 0.03 0.06 2 Mass in Air SVE Ib/day (3) 5 6 1 4 0.01 0.25 0.01 0.02 0.1 1 Total Mass in Air Ib/day 15 15 3 12 0.21 0.55 0.04 0.05 0.16 3 Cat-Ox Destruction % (4) 99 99 99 99 96 96 96 96 96 96 Treated Air Emissions Ib/day 0.15 0.15 0.03 0.12 0.01 0.02 0.002 0.002 0.01 0.14 Treated Air Emissions g/s 7.7E-04 8.0E-04 1.7E-04 6.4E-04 4.4E-05 1.2E-04 8.4E-06 1.0E-05 3.4E-05 7.1E-04 SUM HCI (pounds per day) HCI Emissions (5) .. - 1.1 0.4 0.05 0.05 0.2 2.2 | 3.0 NOTES: 1 Off-gas from the air stripper and SVE will be treated by catalytic oxidation. 2 Assumed air mass is based on estimated removal rates of chemicals by air stripping as shown on Table C-3.1 3 Assumed SVE air mass is estimated from groundwater data as shown on Table B-4.1. Levels are expected to decrease with time. 4 Catalytic Oxidizer destruction efficiencies are specified in equipment Specification Section 13270. 5! Assumed hydrochloric acid (HCI) emitted to the atmosphere after air treatment by catalytic oxidation, in pounds per day. 7 This t^ble is a revision of Table 5 included in the Groundwater and Soils Remediation Program Report dated 13 April 1995. B3-3.XLS (940058.03) TABLE B-3.4 AIR EMISSIONS SUMMARY OF HEALTH RISK ANALYSIS FOR EPA CARCINOGENS Tutu Texaco Service Station (EKI 940058.03) LOCATION Texaco Service Station ESTIMATED INCREMENTAL LIFETIME CANCER RISK On-Site Employees 25 Year Exposure 1.0E-06 5.0E-06 (1) Off-Site Residents 30 Year Exposure 5.0E-07 Off-site Students 8 Year Exposure 4.0E-08 NOTES: 1. Increased risk based on vinyl chloride and benzene concentrations greater than design concentrations. 2. Increased risk based on vinyl chloride concentrations greater than design concentrations. BAIRSUM.XLS O340 (EKI 940058.03) RISK ANALYSIS TABLES TUT OO8 0341 Sub Section B-3 (EKI 940058.03) TABLE B-3.5 TREATED AIR EMISSIONS - TEXACO SERVICE STATION LOCATION HEALTH RISK ANALYSIS FOR EPA CARCINOGENS Tutu Texaco Service Station On-Site Employees Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1 ,2-Dichloroethane (DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl Chloride Methylene Chloride Estimated Emission Rate (9/s) (1) 7.7E-4 4.4E-5 8.4E-6 1.0E-5 3.4E-5 7.1E-4 Maximum Ground Concentration for 1g/s Emission (ug/m3) (2) 540.0 540.0 540.0 540.0 540.0 540.0 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) (3) 4.2E-1 2.4E-2 4.5E-3 5.7E-3 1.8E-2 3.9E-1 Chronic Daily Intake (mg/(kg -d)) (4,5) 2.9E-05 1.7E-06 3.2E-07 4.0E-07 1.3E-06 2.7E-05 Slope Factor (1/mg/(kg-d)) 2.9E-2 (6) 9.1E-02 (6) 2.0E-03 (7) 6.0E-03 (8) 2.9E-01 (8) 1.6E-03 (6) Estimated Incremental Lifetime Cancer Risk (25 Year Exposure) (9) 8.5E-7 1.5E-7 6.4E-10 2.4E-9 3.7E-7 4.4E-8 Total Estimated Incremental Lifetime Cancer Risk 1 .OE-6 Estimated Incremental Lifetime Cancer Risk (10 Year Exposure) (10) 3.4E-7 6.1 E-8 2.6E-10 9.4E-10 1.5E-7 1.8E-8 6.0E-7 1 Emission rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. 2 Maximum lono term impact at the approximate ground elevation of the stack base and located 22 meters (72 ft) away from the stack based on a 1 g/s total rt^«Tem"fsSrri7^m ttle staSt (10% of one hour value obtained using SCREEN2 program, Model No. 5, 1000 SCFM, flat terrain downwash from Antilles Auto Parts, Stack ht = 6.1 meters (20 ft)) 3 Maximum ground concentration = estimated emission rate x maximum ground concentration for 1 g/s emission rate A. On-site exposure factors due to inhalation of chemicals of concern: inhalation Rate = 2.5 m3/hr for 8 hrs/day; exposure frequency = 250 days/year; 5. cSSl^n^ rate x exposure frequency x exposure duration)/ (averaging time x body weight of 70 kg) 6 Slope factors are converted from unit risk factors included in IRIS (1995). 7 Slooe factors are converted from unit risk factors included in U.S. EPA Health Assesment documents 8 S oSe ac o I a e converted from unit risk factors included in the U.S. EPA Health Effects Assessment Summary Tables, FY 1994 Annual. 9' Estimated Incremental Lifetime Cancer Risk Averaged over 70 years with 25 years of exposure = (chronic daily intake x slope factor) 10. Estimated Incremental Lifetime Cancer Risk Averaged over 70 years with 10 years of exposure = 25 year risk x (10/25) 11. Totals may be rounded. 008 (EKI 940058.03) TABLE B-3.6 TREATED AIR EMISSIONS - TEXACO SERVICE STATION LOCATION HEALTH RISK ANALYSIS FOR ERA CARCINOGENS Hypothetical Increase in Benzene & Vinyl Chloride Emission Rates Tutu Texaco Service Station On-Site Employees Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1,2-Dichloroethane (DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl Chloride Methylene Chloride Estimated Emission Rate (9/s) (1) 4.4E-5 8.4E-6 1.0E-5 :iii*pjp2pi:s:S; mtmtzsxmtm 7.1 E-4 Maximum Ground Concentration for 1 g/s Emission Rate (ug/m3) (2) 540.0 540.0 540.0 540.0 540.0 540.0 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) (3) 7.0E-1 2.4E-2 4.5E-3 5.7E-3 1.5E-1 3.9E-1 Chronic Daily Intake (mg/(kg -d)) (4,5) 4.9E-5 1.7E-6 3.2E-7 4.0E-7 1.0E-5 2.7E-5 Slope Factor (1/mg/(kg - d)) 2.9E-2 (6) 9.1 E-2 (6) 2.0E-3 (7) 6.0E-3 (8) 2.9E-1 (8) 1.6E-3 (6) Estimated Incremental Lifetime Cancer Risk 25 Year Exposure (9) 1.4E-6 1.5E-7 6.4E-10 2.4E-9 3.0E-6 4.4E-8 Total Maximum Incremental Cancer Risk 5.0E-6 Estimated Incremental Lifetime Cancer Risk (10 Year Exposure) (10) 5.7E-7 6.1 E-8 2.6E-10 9.4E-10 1.2E-6 1.8E-8 2.0E-6 rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. ra term Sad a th™ approximate ground elevation of the stack base and located 22 meters (72 ft) away from the stack based on a 1 g/s total fflfiffiKSSS of ?ne hour value obtained using SCREEN2 program. Model No. 5, 1000 SCFM, flat terrain downwash from Antilles Auto Parts, Stack ht = 6. 1 meters (20 ft)) omiceinn rata 3 Maximum around concentration = estimated emission rate x maximum ground concentration for 1 g/s emission rate 4. OnS £pS f SSJdJe to inhalation of chemicals of concern: inhalation Rate = 2.5 m3/hr for 8 hrs/day; exposure frequency = 250 days/year; 5 ChrScDally Make ="ilii^nf glr^? wnce'irtratlon5)! inhalation rate x exposure frequency x exposure duration)/ (averaging time x body weight of 70 kg) 6 Slope factors are converted from unit risk factors included in IRIS (1995) 7 Sobe aco s an converted from unit risk factors included in U.S. EPA Health Assesment documents. 8 8 oK SorJ are converted from unit risk factors included in the U.S. EPA Health Effects Assessment Summary Tables, FY 1994 Annual. 9 Estimated Incremental Lifetime Cancer Risk Averaged over 70 years with 25 years of exposure = (chrome daHy mtake x slope factor) 10. EsSed Incremental Lifetime Cancer Risk Averaged over 70 years with 10 years of exposure = 25 year nsk x (10/25) 11. Totals may be rounded. TUT 008 034:::! (EKI 940058.03) TABLE B-3.7 TREATED AIR EMISSIONS - TEXACO SERVICE STATION LOCATION HEALTH RISK ANALYSIS FOR ERA CARCINOGENS Tutu Texaco Service Station Off-Site Resident Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1,2-Dichloroethane (DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl Chloride Methylene Chloride Estimated Emission Rate (9/s) (1) 7.7E-4 4.4E-5 8.4E-6 1.0E-5 3.4E-5 7.1 E-4 Maximum Ground Concentration for 1g/s Emission Rate (ug/m3) (2) 115.0 115.0 115.0 115.0 115.0 115.0 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) (3) 8.9E-2 5.1 E-3 964.7E-6 1.2E-3 3.9E-3 82.0E-3 Chronic Daily Intake (mg/(kg -d)) (4,5) 1.0E-5 5.9E-7 1.1 E-7 1.4E-7 4.5E-7 9.6E-6 Slope Factor (1/mg/(kg - d)) (6,7,8) 2.9E-2 (6) 9.1E-2 (6) 2.0E-3 (7) 6.0E-3 (8) 2.9E-1 (8) 1.6E-3 (6) Estimated Incremental Lifetime Cancer Risk 30 Year Exposure (9) 3.0E-7 5.4E-8 2.CE-10 8.4E-10 1.3E-7 1.6E-8 Total Maximum Incremental Cancer Risk 5.0E-7 1 Emission rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. 1 Maximum lona term impact at a height of 4 meters above the stack base and located 99 meters (325 ft) away from the stack based on a 1 g/s total rt^Sffl^aS from the stack (10% of one hour value obtained using SCREEN2 program, Model No. 2, 1000 SCFM, simple terrain downwash from Antilles Auto Parts, Stack ht = 6.1 meters (20 ft)) 3 Maximum ground concentration = estimated emission rate x maximum ground concentration for 1 g/s emission rate 4'. Off-site exposure factors: inhalation factor = 0.83 m3/hr for 24 hrs/day; exposure frequency = 350 days/year; averaaina time = 70 years x 365 days/year = 25,550 days 5 Chronic Daily Intake = (maximum ground concentration x inhalation rate x exposure frequency x exposure duration)/ (averaging time x body weight of 70 kg) 6 Slope factors are converted from unit risk factors included in IRIS (1995) 7 Slone factors are converted from unit risk factors included in U.S. ERA Health Assesment documents. 8 S one factors are converted from unit risk factors included in the U.S. ERA Health Effects Assessment Summary Tables, FY 1994 Annual. 9'. Estimated Incremental Lifetime Cancer Risk Averaged over 70 years with 30 years of exposure = (chronic daily intake x slope factor) 10. Totals may be rounded. 11. Nearest residence is located 99 meters (325 ft) south of the stack. (EKI 940058.03) TABLE B-3.8 TREATED AIR EMISSIONS - TEXACO SERVICE STATION LOCATION HEALTH RISK ANALYSIS FOR EPA CARCINOGENS Tutu Texaco Service Station Off-Site School Student Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1,2-Dichloroethane (DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl Chloride Methylene Chloride Estimated Emission Rate (g/s) (1) 7.7E-4 4.4E-5 8.4E-6 1.0E-5 3.4E-5 7.1 E-4 Maximum Ground Concentration for 1g/s Emission Rate (ug/m3) (2) 170.0 170.0 170.0 170.0 170.0 170.0 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) (3) 1.31E-01 7.49E-03 1.43E-03 1.78E-03 5.70E-03 1.21E-01 Chronic Daily Intake (mg/(kg -d)) (4,5) 7.4E-7 4.2E-8 8.0E-9 1.0E-8 3.2E-8 6.8E-7 Slope Factor (1/mg/(kg - d)) 2.9E-2 (6) 9.1E-2 (6) 2.0E-3 (7) 6.0E-3 (8) 2.9E-1 (8) 1.6E-3 (6) Estimated Incremental Lifetime Cancer Risk 8 Year Exposure (9) 2.1 E-8 3.8E-9 1.6E-11 6.0E-11 9.5E-9 1.1 E-9 Total Maximum Incremental Cancer Risk 4.0E-8 1 Emission rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. 2 Maximum lona term impact at a height of 6 meters above the stack base and located 88 meters (290 ft) away from the stack based on a 1 g/s total chemical emission rate from the stack (10% of one hour value obtained using SCREEN2 program, Model No. 1, 1000 SCFM, simple terrain downwash from Antilles Auto Parts, Stack ht = 6.1 meters (20 ft)) 3 Maximum ground concentration = estimated emission rate x maximum ground concentration for 1 g/s emission rate 4. Off-site student exposure factors: inhalation factor =3.2 m3/hr for 6 hrs/day; exposure frequency = 270 days/year; averaaina time = 70 years x 365 days/year = 25,550 days 5 Chronic Daily Intake = (maximum ground concentration x inhalation rate x exposure frequency x exposure duration)/ (averaging time x body weight of 36 kg) 6 Slope factors are converted from unit risk factors included in IRIS (1995). 7 Slope factors are converted from unit risk factors included in U.S. EPA Health Assesment documents. 8 Slope factors are converted from unit risk factors included in the U.S. EPA Health Effects Assessment Summary Tables, FY 1994 Annual. 9. Estimated Incremental Lifetime Cancer Risk Averaged over 70 years with 8 years of exposure = (chronic daily intake x slope factor) 10. Totals may be rounded. 11. Nearest school is located 88 meters (290 ft) southeast of the stack. (EKI 940058.03) r»o o VI EPA GUIDANCE FORMULAS AND SACK-UP CALCULATIONS Sub Section B-3 (EK! 940058.03) SUITE 320 united States 1730 SO. AMPHLEJT BLVD. Environmental Protection SAN MATED, CA 94402 Agency Office of Emergency and Remedial Response Washington DG 20460 Superf und EPA/540/1 -39/002 December 1989 PB90-155581 Risk Assessment Guidance for Superfund Volume I Human Health Evaluation Manual (Part A) Interim Final • M £ b ^i i] i @ & a - I LER&KALlNOWSKI.iNa REPRODUCED 3Y SPR1NGRELD, VA. 22161 TUT COS O347 Pat* 6-44 EXHIBIT 6-16 RESIDENTIAL EXPOSURE: INHALATION OF AIRBORNE (VAPOR PHASE) CHEMICALSab Equation: Intake (mg/kg-day) = CA x IR x ET x EFjf ED BWxAT Where: CA m m - ET » EF =* ED * BW =« AT = Contaminant Concentration in Air (mg/m*} Inhalation Rate (m'/hour) Exposure Time (hoars/day) Exposure Frequency (days/year) Exposure Duration (years) Body Weight (kg) Averaging Time (period over which exposure is averaged — days) Variable Values: CA: Site-specific measured or modeled value IR: 30 m-Vday (adult, suggested upper bound value; EPA19894) 20 mVday (adult, average; EPA 1989d) Hourly rates (EPA t989d) Age-specific values (EPA 1985a) Age, sex, and activity based values (EPA ISSSa) 0.6 nrYhr — showering (all age groups; EPA 1989d) ET: Pathway-specific values (dependent on duration of exposure-related activities) 12 minutes — showering (90th percentfle; EPA 19S9d) 7 minutes — showering (50th percentfle; EPA 1989d) EF: Pathway-specific value (dependent on frequency of showering or other exposure-related activities) ED: 70 years (lifetime? by convention) 30 years (national upper-bound time (90th perceatOe) at one residence; EPA I9S9d) 9 years (national median tune (50th percentile) at one residence; EPA 1989d) BW: 70 kg (adult, average; EPA 1989d) Age-specific values (EPA 1935a, 19894) AT: Pathway-specific period of exposure for noncarcinogeaic effects (i.e., ED x 365 days/year), and 70 year lifetime for carcinogenic effects (Le., 70 years x 365 days/year). " Set Section 6.4.1 and 6.6.3 for a. discussion of which variable values should b* usett to caftirtatr the rtmrmaiffi maximum exposure. la general, use 9Sth or 90th percentile values for contact rate and exposure frequency and duration variaMet. Tht equation and variable values far vapor phase exposure eon be used with ato£fiea&an to calculate portietdate exposure.. See text. TUT 008 RtCtlVtU DEC 1 o m ERLER & KAUNOWSKl, INC. SUITE 320 1730 SO. AMPHLETT BLVD. SAN MATED, C* 94402 OSWER DIRECTIVE: 9285.6-03 March 25, 1991 RISK ASSESSMENT GUIDANCE FOR SUPERFUND VOLUME I: HUMAN HEALTH EVALUATION MANUAL SUPPLEMENTAL GUIDANCE "STANDARD DEFAULT EXPOSURE FACTORS" INTERIM FINAL ft d ERLER i KAUNOWSKl, INC. Office of Emergency and Remedial Response Toxics Integration Branch U.S. Environmental Protection Agency Washington, D.C. 20460 (202)475-9486 Of COMMERCE SPRINGFIELD. TUT SUMMARY OP STANDARD DEFAULT EXPOSURE FACTORS (1) Land Uae Residential Commercial/ Industrial Agricultural Recreational H (1) - Fac : exf -i t r< In -' 121 - Lll Expoaure Pathway (2) Ingeatlon of Potable Hater Ingeatlon of Soil and Duat Inhalation of Contaminants Ingeatlon of potable Hater Ingeatlon of Soil and Duat Inhalation of Contaminants Ingest Ion of potable Hater Ingeatlon of Soil and Duat Inhalation of Contaminants Consumption of llomegrown Produce Consumption of Locally Caught Fish -tora preaented are tho ioaurea aaaoclated with m theae valuea, howeve the rlak aaaeaament re ited pathways may not fc Dally Intake Rate 2 lltera 200 mg (chlld| 100 mg (adult) 20 cu.m (total) 15 cu.m (Indoor) 1 liter 50 mg 20 cu.m/workday 2 lltera 200 mg (child* 100 mg (adult) 2O cu.m (total) 15 cu.m (Indoor) 42 g (fruit) 80 g (v«jg.) 54 g ae that ahould gen« , a designated land c, uue of alternatt iport. ,e relevant for all rtuo ^n eite condlt Exposure Frequency 350 daya/year 350 days/year 350 daya/year 260 daya/year 250 daya/year 250 daya/year 350 daya/year 350 days/year 350 daya/year 350 daya/year 350 daya/year srally be used to use. Site-sped 3 valuea should t>< eltes and, other lona. Additional Exposure Duration • 30 years 6 years 24 yeara 30 yeara 25 yeara 25 yeara 25 years 30 yeara 6 yeara 24 yeara 30 yeara 30 years 30 years assess fie data may w a justified an Body Height 70 kg 15 kg (child) 70 kg (adult) 70 kg 70 kg 70 kg 70 kg 70 kg 15 kg (child) 70 kg (adult) 70 kg 70 kg 70 kg arrant deviation d documented exposure pathwaya pathways and applicable default d u e a thftext of thla guidance •;..! &EPA United Slates Environmental Protection Agency Office of Health and Environmental Assessment Washington OC 20460 Research and C-jveicoment Exposure Factors Handbook ERA. 600.8-89-0-13 July 1989 PB90-106774 ERLER & KALINOWSK1, INC. REPRODUCED BY U.S. DEPARTMENT OF COMMERCE NATIONAL TECHNICAL INFORMATION SERVICE SPRINGFIELD, VA. 22161 ERLER &KAUNOWSK1JNC. SUITE 320 1730 SO. AMPHLETT BLVD. SAN MATED, CA 94402 /""""x Table 3-1. Summary of Human Inhalation Rates for Hen. Women, jnd Children by Activity Level (m /hour)* Adult male Adult female Average adult Child, age 6 Child, age 10 Resting13 0.7 0.3 O.S 0.4 0.4 Light0 0.8 0.5 0.5 0.8 1.0 Moderated 2.5 1.5 Z.I 2.0 co> Heavy8 4.3 2.9 3.9 2.4 4.2 d Values of inhalation rates for males, females, and children presented in this table represent the mean of values reported for each activity level in USEPA (1985). Includes watching television, reading, and sleeping. c Includes most domestic work, attending to personal needs and care. hobbies, and conducting minor indoor repairs and home improvements. Includes heavy inctoor cleanup, performance of major indoor repairs and alterations, and climDing stairs. 8 Includes vigorous physical exercise and climbing stairs carrying a load. Derived by taking the mean of the adult male and adult female values for each activity level. 3-4 Taole 5-3 Body Weights of Children (kilograms) _____Soys_____ Girls____, Boy? and girls Mean Std. error Mean Std. error Mean Std. error Age of' mean of mean of mean < 3 3 < 6 6 < 9 9 < 12 12 < 15 15 < 18 U. 9 17.5 25.3 35.7 50.5 64.9 0.0016 0.0014 0.0023 .0.0038 0.0051 0.0047 11.2 17.1 24.5 36.2 50.7 57.4 0.0011 0.0015 0.0024 0.0043 0.0049 0.0042 11.8 17.4 25.0 (^o .0^ 50.5 61.2 — — — — — Source: Adapted from USEPA (1985). 5-6 TUT O08 O35" 800 J..ni . 1' "19 f -VV ^* x"^*^2 MM MM s 8OO Usr - ft? - fffCi L X s - U 111 Ul 11 Ul 111 C X Z n in i/i O O O moo TUT OO8 O3b& AIR EMISSIONS - UNIT RISK FACTORS CHEMICAL Benzene 1,2-DCA PCE TCE Vinyl Chloride Methylene Chloride UNIT RISK ug/m3 8.3E-06 2.6E-05 5.8E-07 1.7E-06 8.40E-05 4.7E-07 REFERENCE Iris April 1995 Iris April 1995 US EPA Health Effects Assessment Summary Tables US EPA Health Effects Assessment Summary Tables US EPA Health Effects Assessment Summary Tables Iris April 1995 UNRSKXLS (EW 940058.00) 5/18/95 TEXACO SERVICE STATION SCREEN2 SIMULATION ASSUMPTIONS, RESULTS AND OUTPUT TUT OOS O35S Sub Section B-3 (EKI 940058.03) TEXACO SERVICE STATION LOCATION AIR MODELING Five model runs using the Screen2 air dispersion model for air emissions emanating from the proposed caltalytic oxidizer treatment unit at the Texaco Tutu Service Station location, St. Thomas, U.S. Virgin Islands are described below. The five model runs were generated to determine the worst-case air emissions scenario in the vicinity of the catalytic oxidizer stack and resulting maximum chemical concentration for a 1 g/s emission rate. This concentration is used in the calculation for the incremental carcinogenic risk shown on Tables Al through A3 . The worst-case scenario is Model No. 5, as described below, showing a maximum concentration of 5,436 ug/m3 at a distance of 22 meters from the stack. The assumptions of the five model runs are described below and the SCREEN2 printout results follow. Model No. 1, "texl": Assumptions: • The treatment system is located on flat terrain (approximate elevation 181 feet) • Stack height = 6.1 meters above ground surface Stack diameter = 0.2 meters Stack velocity = 15 meters/second • Air dispersion is toward the east of the treatment system, and up a hill. (The complex terrain and simple terrain inputs model this geography.) Results: • The maximum concentration (3,475 ug/m3) occurred at a distance of 41 meters from the stack. • The maximum concentration at the nearest school (1,673 ug/m3) occurred at a distance of 88 meters from the stack. TUT COS O359 MODSTA.DOC (EKI 940053.00) TEXACO SERVICE STATION LOCATION AIR MODELING Model. No. 2, Wtexsim2" : Assumptions: • The treatment system is located on flat terrain (approximate elevation 181 feet) • Stack height = 6.1 meters above ground surface Stack diameter = 0.2 meters Stack velocity = 15 meters/second • Air dispersion is toward the south and southeast of the treatment system, and up a hill that is lower than the top of the stack. (The simple terrain input models this geography.) • The maximum concentration at the nearest residence (1,150 ug/m3) occurred at a distance of 99 meters from the stack. Results: • The maximum concentration (4,728 ug/m3) occurred at a distance of 23 meters from the stack. Model No. 3, wtextfIt2": Assumptions: • The treatment system is located on flat terrain (approximate elevation 181 feet) • Stack height = 6.1 meters above ground surface Stack diameter = 0.2 meters Stack velocity = 15 meters/second • Air dispersion is toward the southwest of the treatment system, and down a hill or across flat terrain. (The flat terrain input models this geography.) Results: • The maximum concentration (4,498 ug/m3) occurred at a distance of 24 meters from the stack. MODSTA.DOC (EKI 940058.00) TEXACO SERVICE STATION LOCATION AIR MODELING Model. No. 4, "texnth" : Assumptions: • The treatment system is located on flat terrain (approximate elevation 181 feet) • Stack height = 6.1 meters above ground surface Stack diameter = 0.2 meters Stack velocity = 15 meters/second • Air dispersion is toward the north of the treatment system, across flat terrain and toward lower elevations. (The flat terrain input models this geography.) Results: • The maximum concentration (4,914 ug/m3) occurred at a distance of 22 meters from the stack. Model No. 5, Wtexnth2": Assumptions: • The treatment system is located on flat terrain (approximate elevation 181 feet) • Stack height = 6.1 meters above ground surface Stack diameter = 0.25 meters Stack velocity = 9.3 meters/second • Air dispersion is toward the north of the treatment system, across flat terrain and toward lower elevations. (The flat terrain input models this geography.) Results: • The maximum concentration (5,436 ug/m3) occurred at a distance of 22 meters from the stack. MODSTA.DOC (EKI 940058.00) TEXACO SERVICE STATION LOCATION AIR MODELING General Assumptions: • Downwash from Antilles Auto Parts is included in all model runs. • Background concentrations are not included in any of the model runs. MODSTA.DOC (EKI 940053.00) Path: C:\BREEZE\TUTU File: TEX1 .LST 11,350 .a.. 5-05-95 8:44:06 am TEXACO TUTU STATION/ /HR DISPERSION/ MODEL NO. TUT 008 036- ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALINOWSKI .exl 05/05/95 08:44:06 COMPLEX TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HT (M) STACK DIAMETER (M) STACK VELOCITY (M/S) STACK GAS TEMP (K) AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION POINT 1.00000 6.0957 .2000 15.0203 477.6000 294.2600 .0000 URBAN BUOY. FLUX = .565 M**4/S**3; MOM. FLUX = 1.390 M**4/S**2. /INAL STABLE PLUME HEIGHT (M) » 24.2 TO FINAL RISE (M) = 200.6 TERR HT (M) 6. 7. 8. 8. 9. 9. DIST (M) 117. 122. 137. 145. 152. 158. MAX 24-HR CONC (UG/M**3) 286.5 273.3 233.9 216.8 201.1 189.7 *VALLEY 24-HR CALCS* PLUME HT CONC ABOVE STK (UG/M**3) 77.30 78.99 69.77 67.65 65.33 64.03 BASE (M) 18.8 19.1 20.2 20.7 21.2 21.6 **SIMPLE TERRAIN 24-HR CALCS** PLUME HT CONC ABOVE STK U10M USTK (UG/M**3) 286.5 273.3 233.9 216.8 201.1 189.7 HGT (M) 14.0 14.0 14.0 14.0 14.0 14.0 SC (M/S) 4 1.0 1.0 4 1.0 1.0 4 1.0 1.0 4 1.0 1.0 4 1.0 1.0 4 1.0 1.0 05/05/95 08:44:06 cexl SIMPLE TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HEIGHT (M) STK INSIDE DIAM (M) STK EXIT VELOCITY (M/S) STK GAS EXIT TEMP (K) AMBIENT AIR TEMP (K) ,^ RECEPTOR HEIGHT (M) URBAN/RURAL OPTION BUILDING HEIGHT (M) MIN HORIZ BLDG DIM (M) MAX HORIZ BLDG DIM (M) POINT 1.00000 6.0957 .2000 15.0203 477.6000 294.2600 1.5000 URBAN 7.3150 17.6780 23.7730 Path: C:\BREEZE\TUTU File: TEX1 .LST 11,350 .a.. 5-05-95 8:44:06 am E . FLUX = .565 M**4/S**3; MOM. FLUX = 1.390 M**4/S**2. ** FULL METEOROLOGY *** ********************************* •"** SCREEN DISCRETE DISTANCES *** ******************************** -'-** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 34. 3396. 6 2.0 2.0 10000.0 6.85 3.66 4.7 ******************************** "* SCREEN DISCRETE DISTANCES *** ********************************* ** TERRAIN HEIGHT OF 1. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS /^V38. 3369. 6 2.0 2.0 10000.0 6.51 4.16 4.9 x^****************************** *** SCREEN DISCRETE DISTANCES *** -*-******************************** »** TERRAIN HEIGHT OF 2. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 41. 3475.«-*AX. 6 2.0 2.0 10000.0 6.09 4.48 5. ********************************* *** SCREEN DISCRETE DISTANCES *** ******************************** *** TERRAIN HEIGHT OF 2. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 46. 3348. 6 2.0 2.0 10000.0 5.79 4.98 5. ********************************* ** SCREEN DISCRETE DISTANCES *** /**^v ******* ********************** ** TERRAIN HEIGHT OF 3. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA Path: C:\BREEZE\TUTU File: TEX1 .LST 11,350 .a.. 5-05-95 8:44:06 am (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 61. 2322. 6 2.0 2.0 10000.0 6.28 6.63 6. ********************************* *** SCREEN DISCRETE DISTANCES *** r******************************** *** TERRAIN HEIGHT OF 3. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 67. 2148. 6 2.0 2.0 10000.0 6.13 7.28 6.53 ********************************* *** SCREEN DISCRETE DISTANCES *** r******************************** >** TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 76. 1826. 6 2.0 2.0 10000.0 6.23 8.26 7. ****************************** <** SCREEN DISCRETE DISTANCES *** ********************************* '«** TERRAIN HEIGHT OF 5. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 78. 1878. 6 2.0 2.0 10000.0 5.74 8.42 7. ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* *** TERRAIN HEIGHT OF 5. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 79. 1921. 5 2.0 2.0 10000.0 5.25 8.58 7.46 S ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* * ~* TERRAIN HEIGHT OF 6. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH Path: C:\BREEZE\TUTU File: TEX1 .LST 11,350 .a.. 5-05-95 8:44:06 am 81. 1948. 2.0 2.0 10000.0 4.77 8.74 7.57 SS ******************************** ** SCREEN DISCRETE DISTANCES *** ********************************* ** TERRAIN HEIGHT OF 6. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 88. 1673 .<r SCHOOL 5 2.0 2.0 10000.0 5.07 9.56 8.10 SS ******************************** *** SCREEN DISCRETE DISTANCES *** ******************************** *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH DWASH= MEANS NO CALC MADE (CONC = 0.0) t*TASH=NO MEANS NO BUILDING DOWNWASH USED • iSH=HS MEANS HUBER-SNYDER DOWNWASH USED wWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB ******************************************** * SUMMARY OF TERRAIN HEIGHTS ENTERED FOR * * SIMPLE ELEVATED TERRAIN PROCEDURE * ******************************************** TERRAIN HT (M) DISTANCE RANGE (M) MINIMUM MAXIMUM 0. 34. 1. 38. 2. 41. 2. 46. 3. 61. 3. 67. 4. 76. 5. 78. 5. 79. 6. 81. 6. 88. *** CAVITY CALCULATION - 1 *** /""""ONC (UG/M**3) = 1723. JRIT WS @10M (M/S) = 4.45 GRIT WS § HS (M/S) = 4.45 DILUTION WS (M/S) = 2.23 CAVITY HT (M) = 7.82 *** CAVITY CALCULATION - 2 *** CONC (UG/M**3) = 1853. CRIT WS §10M (M/S) = 5.56 CRIT WS § HS (M/S) = 5.56 DILUTION WS (M/S) - 2.78 CAVITY HT (M) = 7.49 TUT 008 Path: C:\BREEZE\TUTU Pile: TEX1 .LST 11,350 .a.. 5-05-95 8:44:06 am /*«AVITY LENGTH (M) = 22.95 CAVITY LENGTH (M) = 19.29 ONGWIND DIM (M) - 17.68 ALONGWIND DIM (M) - 23.77 *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** CALCULATION MAX CONC DIST TO TERRAIN PROCEDURE (UG/M**3) MAX (M) HT (M) IMPLE TERRAIN 3475. 41. 2. COMPLEX TERRAIN 286.5 117. 6. (24-HR CONC) OILDING CAVITY-1 1723. 23. — (DIST = CAVITY LENGTH) BUILDING CAVITY-2 1853. 19. — (DIST = CAVITY LENGTH) *************************************************** ** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** ************************************************** UN ENDED ON 05/05/95 AT 08:44:06 /—... TUT Path: C:\BREEZE\TUTU File: TEXSIM2 .LST 13,015 .a.. 5-05-95 9:24:36 am -TEX4CO TUTU SERVICE STATION AIR DISPERSION AAODEL NO. Z PUT oo ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALINOWSKI 05/05/95 09:24:36 exsixn2 'IMPLE TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HEIGHT (M) STK INSIDE DIAM (M) STK EXIT VELOCITY (M/S) STK GAS EXIT TEMP (K) < AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION BUILDING HEIGHT (M) MIN HORIZ BLDG DIM (M) MAX HORIZ BLDG DIM (M) POINT 1.00000 6.0957 .2000 15.0203 477.6000 294.2600 1.5000 URBAN 7.3150 17.6780 23.7730 JUOY. FLUX = .565 M**4/S**3; MOM. FLUX = FULL METEOROLOGY *** ********************************* •*** SCREEN DISCRETE DISTANCES *** t******************************** 1.390 M**4/S**2, *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) SIGMA Z (M) DWASH 3. .0000 .0 .0 .0 .00 .00 .00 NA ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) SIGMA Z (M) DWASH 8. .0000 .0 .0 .0 .00 .00 .00 NA r******************************* • SCREEN DISCRETE DISTANCES *** ********************************* *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** Path: C:\BREEZE\TUTU File: TEXSIM2 .LST 13,015 .a.. 5-05-95 9:24:36 am CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 15. .0000 0 .0 .0 .0 .00 .00 .00 NA ********************************* *** SCREEN DISCRETE DISTANCES *** ?******************************** '•** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 17. .0000 0 .0 .0 .0 .00 .00 .00 NA r******************************** *** SCREEN DISCRETE DISTANCES *** ********************************* '** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH X-S. 20. .0000 0 .0 .0 .0 .00 .00 .00 NA it************ ******************** *** SCREEN DISCRETE DISTANCES *** *v******************************** *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 23. 4728. •+- MAX. 6 2.0 2.0 10000.0 6.61 2.50 4. ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 25. 4312. 6 2.0 2.0 10000.0 6.71 2.74 4. ********************************* s&Z* SCREEN DISCRETE DISTANCES *** .****************************** *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA Path : C : \BREEZE\TUTU File: TEXSIM2 .LST 13,015 .a.. 5-05-95 9:24:36 am ) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWA 28. 3819. 6 2.0 2.0 10000.0 6.86 3.06 4.43 SS .******************************** *** SCREEN DISCRETE DISTANCES *** ******************************** *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 30. 3475. 6 2.0 2.0 10000.0 6.98 3.33 4.57 S ********************************* ** SCREEN DISCRETE DISTANCES *** ******************************** *•** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 38. 2664. 6 2.0 2.0 10000.0 7.42 4.16 4.98 SS /*~ N ****************************** ** SCREEN DISCRETE DISTANCES *** ** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 47. 2064. 6 2.5 2.5 10000.0 7.06 5.15 5.81 SS ******************************** *** SCREEN DISCRETE DISTANCES *** ********************************* *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 49. 2105. 6 2.5 2.5 10000.0 6.82 5.31 5.89 SS ********************************* *** SCREEN DISCRETE DISTANCES *** * ********** ******************* ~* TERRAIN HEIGHT OF 1. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWA Path: C:\BREEZE\TUTU File: TEXSIM2 .LST 13,015 .a.. 5-05-95 9:24:36 am 49. 2332. 6 2.0 2.0 10000.0 7.26 5.38 5. ******************************** ** SCREEN DISCRETE DISTANCES *** ********************************* ** TERRAIN HEIGHT OF 2. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC D10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 50. 2573. 6 2.0 2.0 10000.0 6.71 5.48 5. ******************************** *** SCREEN DISCRETE DISTANCES *** ********************************* **** TERRAIN HEIGHT OF 2. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 52. 2752. 6 2.0 2.0 10000.0 6.21 5.64 5. ********************************* /""""v SCREEN DISCRETE DISTANCES *** ****************************** *** TERRAIN HEIGHT OF 3. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 55. 2776. 6 2.0 2.0 10000.0 5.82 5.97 5. ********************************* *** SCREEN DISCRETE DISTANCES *** .********************************* <** TERRAIN HEIGHT OF 3. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWA 58. 2774. 6 2.0 2.0 10000.0 5.43 6.30 6. ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* /•*•*•* TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS Path: C:\BREEZE\TUTU File: TEXSIM2 .LST 13,015 .a.. 5-05-95 9:24:36 am /—\ 99. 1150.-e HOUSE 4 1.0 1.0 320.0 9.88 15.55 13.67 SS DWASH= MEANS NO CALC MADE (CONC = 0.0) DWASH=NO MEANS NO BUILDING DOWNWASH USED DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB ******************************************** * SUMMARY OF TERRAIN HEIGHTS ENTERED FOR * * SIMPLE ELEVATED TERRAIN PROCEDURE * ******************************************** TERRAIN HT (M) 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 1. 2. 2. 3. 3. 4. DISTANCE RANGE (M) MINIMUM MAXIMUM 3. 8. 15. 17. 20. 23. 25. 28. 30. 38. 47. 49. 49. 50. 52. 55. 58. 99. *** CAVITY CALCULATION - 1 *** CONC (UG/M**3) = 1723. CRIT WS @10M (M/S) = 4.45 GRIT WS @ HS (M/S) - 4.45 DILUTION WS (M/S) = 2.23 CAVITY HT (M) = 7.82 CAVITY LENGTH (M) = 22.95 ALONGWIND DIM (M) = 17.68 *** CAVITY CALCULATION - 2 *** CONC (UG/M**3) = 1853. GRIT WS @10M (M/S) = 5.56 CRIT WS § HS (M/S) - 5.56 DILUTION WS (M/S) = 2.78 CAVITY HT (M) - 7.49 CAVITY LENGTH (M) = 19.29 ALONGWIND DIM (M) = 23.77 *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** CALCULATION PROCEDURE TERRAIN BUILDING CAVITY- 1 BUILDING CAVITY-2 MAX CONC (UG/M**3) 4728. 1723. 1853. DIST TO MAX (M) 23. 23. 19. TERRAIN HT (M) 0. — (DIST — (DIST CAVITY LENGTH) CAVITY LENGTH) TUT OOS O374 Path: C:\BREEZE\TUTU File: TEXSIM2 .LST 13,015 .a.. 5-05-95 9:24:36 am * .•*********************************************** ** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** ************************************************** UN ENDED ON 05/05/95 AT 09:24:37 Path: C:\BREEZE\TUTU File: TEXFLT2 .LST 4,451 .a.. 5-05-95 9:34:14 am T£X/ICO TUTU SERVICE STATION/ /IIR MODEL NO. 3 ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALINOWSKI 05/05/95 09:34:12 exflt2 SIMPLE TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HEIGHT (M) STK INSIDE DIAM (M) STK EXIT VELOCITY (M/S) STK GAS EXIT TEMP (K) AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION BUILDING HEIGHT (M) MIN HORIZ BLDG DIM (M) < MAX HORIZ BLDG DIM (M) < POINT 1.00000 6.0957 .2000 15.0203 477.6000 294.2600 1.5000 URBAN 7.3150 17.6780 23.7730 iUOY. FLUX = .565 M**4/S**3; MOM. FLUX = /****% FULL METEOROLOGY *** ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* 1.390 M**4/S**2, *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST (M) 8. 12. 16. 20. 24. 27. 31. 35. 39. 43. 47. 51. 55. 59. ~v 64. 107. CONC (UG/M**3) STAB .0000 .0000 .0000 .0000 4498. *• MAX. 3906. 3408. 2956. 2586. 2300. 2076. 1884. 1717. 1577. 1457. 847.1 0 0 0 0 6 6 6 6 6 6 6 6 6 4 4 4 U10M (M/S) .0 .0 .0 .0 2.0 2.0 2.0 2.0 2.0 2.5 2.5 2.5 2.5 1.5 1.5 1.0 USTK (M/S) .0 .0 .0 .0 2.0 2.0 2.0 2.0 2.0 2.5 2.5 2.5 2.5 1.5 1.5 1.0 MIX HT (M) 10000 10000 10000 10000 10000 10000 10000 10000 10000 480 430 320 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 PLUME HT (M) * . m 6. 6. 7. 7. 7. 6. 7. 7. 7. 8. 8. 13. 00 00 00 00 66 83 01 24 48 91 05 21 37 73 73 54 SIGMA Y (M) .00 .00 .00 .00 2.63 3.00 3.39 3.82 4.26 4.69 5.12 5.55 5.98 9.33 10.11 16.72 SIGMA Z (M) DWASH .00 .00 .00 .00 4.22 4.40 4.60 4.81 5.03 5.56 5.79 6.02 6.25 8.19 8.88 14.70 NA NA NA NA SS SS ss ss ss ss ss ss ss ss ss ss DWASH= MEANS NO CALC MADE (CONC =0.0) DWASH=NO MEANS NO BUILDING DOWNWASH USED TUT COS 0377 Path: C:\BREEZE\TUTU File: TEXFLT2 .LST 4,451 .a.. 5-05-95 9:34:14 am HS MEANS HUBER-SNYDER DOWNWASH USED \SH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED L>v?ASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB *** CAVITY CALCULATION - 1 *** CONC (UG/M**3) = 1723. CRIT WS §10M (M/S) = 4.45 CRIT WS @ HS (M/S) = 4.45 DILUTION WS (M/S) - 2.23 CAVITY HT (M) = 7.82 CAVITY LENGTH (M) = 22.95 ALONGWIND DIM (M) = 17.68 *** CAVITY CALCULATION CONC (UG/M**3) CRIT WS §10M (M/S) = CRIT WS § HS (M/S) = DILUTION WS (M/S) = CAVITY HT (M) CAVITY LENGTH (M) = ALONGWIND DIM (M) - *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** 2 *** 1853. 5.56 5.56 2.78 7.49 19.29 23.77 CALCULATION PROCEDURE IMPLE TERRAIN BUILDING CAVITY-1 UILDING CAVITY-2 MAX CONC (UG/M**3) DIST TO MAX (M) 4498. 1723. 1853. 24. 23. 19. TERRAIN HT (M) 0. -- (DIST — (DIST CAVITY LENGTH) CAVITY LENGTH) ************************************************ REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** *************************************************** ENDED ON 05/05/95 AT 09:34:15 TUT OOS O:T/R Path: C:\BREEZE\TUTU File: TEXNTH .LST 4,611 .a.. 5-05-95 3:06:32 pm "TEXACO TUTU SERVICE STATION AIR. DI5P5R5ION MODEL NO. i UT COS o:v/9 ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** * IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALINOWSKE 05/05/95 15:06:28 • axnth PIMPLE TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HEIGHT (M) STK INSIDE DIAM (M) STK EXIT VELOCITY (M/S) STK GAS EXIT TEMP (K) AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION BUILDING HEIGHT (M) MIN HORIZ BLDG DIM (M) MAX HORIZ BLDG DIM (M) POINT 1.00000 6.0957 .2000 15.0203 477.6000 294.2600 1.5000 URBAN 7.3150 17.6780 23.7730 _JOY. FLUX = .565 M**4/S**3; MOM. FLUX FULL METEOROLOGY *** ********************************* *** SCREEN DISCRETE DISTANCES *** ******************************** 1.390 M**4/S**2, *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST (M) 5. 10. 15. 20. 22. 24. 26. 28. 30. 32. 34. 36. 38. ~H, 40. 50. 60. 70. 80. CONC (UG/M**3) .0000 .0000 .0000 .0000 4914. «• MAX. 4498. 4137. 3819. 3538. 3286. 3060. 2857. 2672. 2505. 1929. 1553. 1318. 1111. STAB 0 0 0 0 6 6 6 6 6 6 6 6 6 6 6 4 4 4 U10M (M/S) .0 .0 .0 .0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.5 1.5 1.5 1.5 USTK (M/S) .0 .0 .0 .0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.5 1.5 1.5 1.5 MIX HT (M) .0 .0 .0 .0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 430.0 480.0 480.0 PLUME HT (M) .00 .00 .00 .00 6.58 6.66 6.76 6.86 6.96 7.07 7.18 7.30 7.42 7.54 7.17 8.73 8.73 8.73 SIGMA Y (M) .00 .00 .00 .00 2.41 2.63 2.85 3.06 3.28 3.50 3.71 3.93 4.15 4.37 5.45 9.49 11.05 12.60 SIGMA Z (M) .00 .00 .00 .00 4.11 4.22 4.33 4.43 4.54 4.65 4.76 4.86 4.97 5.08 5.96 8.33 9.70 11.07 DWASH NA NA NA NA SS SS SS SS SS SS SS SS SS SS SS SS SS SS TUT OOS O3SO Path: C:\BREEZE\TUTU File: TEXNTH .LST 4,611 .a. 5-05-95 3:06:32 pm ASH= MEANS NO CALC MADE (CONC =0.0) ,,^ASH=NO MEANS NO BUILDING DOWNWASH USED DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB *** CAVITY CALCULATION - 1 *** CONC (UG/M**3) = 1723. CRIT WS @10M (M/S) = 4.45 GRIT WS @ HS (M/S) - 4.45 DILUTION WS (M/S) = 2.23 CAVITY HT (M) = 7.82 CAVITY LENGTH (M) = 22.95 ALONGWIND DIM (M) = 17.68 *** CAVITY CALCULATION CONC (UG/M**3) CRIT WS @10M (M/S) = CRIT WS @ HS (M/S) - DILUTION WS (M/S) = CAVITY HT (M) CAVITY LENGTH (M) - ALONGWIND DIM (M) - *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** 2 *** 1853. 5.56 5.56 2.78 7.49 19.29 23.77 CALCULATION PROCEDURE SIMPLE TERRAIN BUILDING CAVITY-1 CAVITY-2 MAX CONC (UG/M**3) 4914. 1723. 1853. DIST TO MAX (M) 22. 23. 19. TERRAIN HT (M) 0. — (DIST — (DIST CAVITY LENGTH) CAVITY LENGTH) t* REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** *UN ENDED ON 05/05/95 AT 15:06:32 TUT 008 Path: C:\BREEZE\TUTU File: TEXNTH2 .LST 4,611 .a.. 5-09-95 8:53:48 am /*—s T.£XAco /I//?. DI5P6R.5ION MODEL A/0. 5 TUT OO8 O3S2 ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALINOWSKI 05/09/95 08:53:45 exnth2 SIMPLE TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HEIGHT (M) STK INSIDE DIAM (M) STK EXIT VELOCITY (M/S)' STK GAS EXIT TEMP (K) '• AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION BUILDING HEIGHT (M) MIN HORIZ BLDG DIM (M) < MAX HORIZ BLDG DIM (M) = POINT 1.00000 6.0957 .2500 9.3210 477.6000 294.2600 1.5000 URBAN 7.3150 17.6780 23.7730 KJOY. FLUX = .548 M**4/S**3; MOM. FLUX = /*°" N FULL METEOROLOGY *** ********************************* *** SCREEN DISCRETE DISTANCES *** :******************************** .836 M**4/S**2, *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST (M) 5. 10. 15. 20. 22. 24. 26. 28. 30. 32. 34. 36. 38. 40. ^ 50. 60. 70. 80. CONC (UG/M**3) .0000 .0000 .0000 .0000 5436.<-*!/ 4980. 4584. 4237. 3931. 3657. 3412. 3191. 2991. 2809. 2103. 1644. 1375. 1216. STAB 0 0 0 0 IX. 6 6 6 6 6 6 6 6 6 6 6 4 4 4 U10M (M/S) .0 .0 .0 .0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 1.5 1.5 1.0 USTK (M/S) .0 .0 .0 .0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 1.5 1.5 1.0 MIX HT (M) .0 .0 .0 .0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 480.0 480.0 320.0 PLUME HT (M) .00 .00 .00 .00 6.50 6.57 6.65 6.73 6.82 6.91 7.01 7.11 7.22 7.33 7.92 8.25 8.25 12.44 SIGMA Y (M) .00 .00 .00 .00 2.41 2.63 2.85 3.06 3.28 3.50 3.71 3.93 4.15 4.37 5.45 9.49 11.05 12.60 SIGMA Z (M) .00 .00 .00 .00 4.46 4.58 4.69 4.81 4.93 5.04 5.16 5.28 5.39 5.51 6.09 8.33 9.70 11.07 DWASH NA NA NA NA SS SS SS SS SS SS SS SS SS SS SS SS SS SS TIJ: Path: C:\BREEZE\TUTU File: TEXNTH2 .LST 4,611 .a.. 5-09-95 8:53:48 am MEANS NO CALC MADE (CONC = 0.0) ASH=NO MEANS NO BUILDING DOWNWASH USED uvJASH=HS MEANS HUBER-SNYDER DOWNWASH USED DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB *** CAVITY CALCULATION - 1 *** CONC (UG/M**3) = 2199. GRIT WS @10M (M/S) = 3.49 GRIT WS @ HS (M/S) - 3.49 DILUTION WS (M/S) = 1.74 CAVITY HT (M) = 7.82 CAVITY LENGTH (M) - 22.95 ALONGWIND DIM (M) = 17.68 *** CAVITY CALCULATION CONC (UG/M**3) CRIT WS @10M (M/S) = GRIT WS @ HS (M/S) = DILUTION WS (M/S) = CAVITY HT (M) CAVITY LENGTH (M) - ALONGWIND DIM (M) = *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** 2 *** 2356. 4.38 4.38 2.19 7.49 19.29 23.77 CALCULATION PROCEDURE SIMPLE TERRAIN JUILDING CAVITY-1 RTTTLDING CAVITY-2 _/»*wp*\ MAX CONC (UG/M**3) 5436. 2199. 2356. DIST TO MAX (M) 22. 23. 19. TERRAIN HT (M) 0. — (DIST — (DIST CAVITY LENGTH) CAVITY LENGTH) *************************************************** ** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** XUN ENDED ON 05/09/95 AT 08:53:48 TUT O08 O38-< SPECIFICATION 13270 - CATALYTIC OXIDIZER Sub Section B-3 (EK. 940058.03) SECTION 13270 - CATALYTIC OXIDIZER PART 1 — GENERAL 1.1 The Requirement A. General: The EQUIPMENT SUPPLIER shall furnish a skid mounted catalytic oxidizer suitable for automatic operation, together with all necessary auxiliary equipment, including but not limited to: blowers, burner/gas train, reactor, catalyst, heat exchanger, exhaust stack, piping, valves, fittings, controls, gauges, supports, and appurtenances. EQUIPMENT SUPPLIER shall provide a complete and workable system as specified herein. The catalytic oxidizer furnished by the EQUIPMENT SUPPLIER will become part of a treatment plant treating air discharged from an air stripper ("AS") and a soil vapor extraction ("SVE") system. The treatment plant will be assembled within an 8 foot by 40 foot shipping container at the facility of the CONTRACTOR in Campbell, CA and delivered to the site in St. Thomas, U.S. Virgin Islands for installation. 1.2 EQUIPMENT SUPPLIER Submittals A. Shop Drawings: Furnish four copies of shop drawings for the total system including blowers, heat exchanger and controls. One copy shall be returned following review by ENGINEER. Shop drawings shall contain the following information: 1. Descriptive information and drawings including but not limited to: a. Destruction efficiencies. b. Preheater and catalyst bed temperatures. c. Materials of construction. d. Catalyst type, volume and expected life. e. Stack height and gas stack velocity. f. Temperature and other control mechanisms. g. System shutdowns. h. A process and instrumentation diagram. i. Operating characteristics of blowers. j. Utilities needed for operation of the unit. k. Footprint and height of the unit. 1. Calculated weights and actual shipping. m. Locations of piping inlets and outlets. n. Delivery conditions and warranties. 2. Electrical and instrumentation information as follows: a. Materials list and catalog cuts for instruments and electrical components, b. Control panel elementary diagram, c. System interconnection diagram showing conduit sizes, wire gage and count. 13270-1 (EKI 940058.00) TUT' OOS 038 d. Motor data sheets for air blowers to include manuf acturer , full load amps, power factor, efficiency, horsepower/ voltage, service factor, insulation class and temperature rating. e. Interior and exterior control panel layouts showing component locations and nameplate inscriptions. f . Normal start-up, shut down, and safety sequences. 3. Seismic calculations for the complete skid-mounted unit, verified and stamped by a registered civil or structural engineer, to demonstrate conformance with the seismic requirements of the Uniform Building Code, current edition, Section 2311, Earthquake Regulations. 4. Manuals: Furnish three copies each of manufacturer's installation, operation and maintenance manuals, bulletins, lubrication instructions, and spare parts lists. 5. Submittal Dates: By 23 June 1995, within approximately two weeks of receipt of letter of intent from Owner to purchase equipment, provide the following shop drawings: a. Footprint and height of unit. b. A draft process and instrumentation drawing. c. Locations of piping inlets and outlets. d. List of system shutdowns. Submit all remaining shop drawings within 4 weeks of receipt of purchase order of equipment. Submit manuals at the same time as delivery of the unit. B. Connections: Use dimensional drawings to scale, clearly communicate the exact location, orientation, elevation, size, and type of all field connections required, including but not limited to the following. 1. Anchor bolts. 2. Process piping. 3. Electrical Power. 4 . Propane . 5. Instrumentation and controls. Part 2 — PRODUCTS 2.1 General Information A. Process Air Composition (combined flow from the AS and SVE systems) 13270-2 (EKI 940058.00) Component lib/day Benzene 15 Toluene 15 Ethylbenzene 3 Xylene Naphthalene Methyl tert butyl ether (MTBE) 40~ 1,2-Dichloroethane (DCA) 0.2 1,2-Dichloroethene (DCE) 0.5 tetrachloroethene (PCE) 0.04 Trichloroethene (TCE) 0.05 Vinyl Chloride 0.2 Methylene Chloride 3 2.2 Performance and Capacity Requirements A. Air streams from the AS and SVE shall be treated to remove organic compounds. The catalytic oxidizer shall meet or exceed the following performance and capacity requirements: Air Stripper capacity 900 scfm SVE system capacity 100 scfm Total capacity (scfm) 1,000 scfm Preheater Propane Heat Exchanger Efficiency 50% Destruction Efficiency Destruction Component Efficiency % Benzene 99 Toluene 99 Ethylbenzene 99 Xylene 99 Naphthalene 9 5 Methyl tert butyl ether (MTBE) 95 1,2-Dichloroethane (DCA) 96 1,2-Dichloroethene (DCE) 96 tetrachloroethene (PCE) 96 Trichloroethene (TCE) 96 Vinyl Chloride 96 Methylene Chloride 96 2.3 Design and Construction A. Skid Mounted Unit: Equipment supplier shall furnish a complete skid-mounted catalytic oxidizer unit suitable for placement within an 8 foot by 40 foot by 8 foot high container. This container will be used for shipping and for 13270—3 (EKl 940058.00) TUT OO8 O38S permanent housing. Provide a unit footprint with adequate operation and maintenance access from one side of the unit. B. Corrosion Protection: Due to proximity of the ocean and a warm and humid climate, conditions at the site are extremely favorable for corrosion of exposed parts. Whenever possible, external parts and controls shall be constructed with corrosion resistant materials. Electrical enclosures shall be constructed of plastic. C. Vacuum Blower System: The vacuum blower system shall consist of two blowers, a vacuum blower on the SVE inlet and a second vacuum blower on the AS inlet. These two blower systems shall have the following characteristics and components. 1. The vacuum blower on the SVE inlet shall be sufficient to produce 100 scfm of airflow at a system inlet pressure of 6 inches Hg below atmospheric pressure. 2. The vacuum blower on the AS inlet shall be sufficient to produce 900 scfm of airflow at a system inlet pressure of 25 inches of water below atmospheric pressure. 3. The two blowers shall have outlet pressures sufficient to pass the combined airstream through the catalytic oxidizer system. 4. The blowers shall operate on three phase 230 volt power. 5. Ambient air inlet piping and valves shall be sized for 100 scfm on the SVE process inlet and 900 scfm on the AS process inlet. 6. Vacuum blowers shall have an inlet particulate filter, vibration isolation and recycle piping (i.e., piping from discharge to inlet) with a gate valve to allow the total system throughput to be decreased by partially opening the valve in the recycle piping. 7. Each blower shall have a flow sensor located near the blower discharge. 8. Vacuum and pressure gages, sample ports, and safety switches shall be provided as necessary to monitor performance and protect equipment. This shall include, at a minimum, a vacuum relief valve with an adjustable set point preset to 6 inches of Hg on the SVE process inlet and a vacuum relief valve with an adjustable set point preset to 2 inches of Hg on the AR process inlet. 9. The blowers and motor shall be housed in a ventilated noise abatement box. The box shall be designed with sufficient noise-abatement material to limit the noise to 80 dBA maximum, measured at three feet from the box. 13270-4 (EKl 940058.00) TUT O08 0389 The walls of the box shall be removable as needed to provide sufficient access for blower and motor maintenance. Ventilation shall be sufficient for motor cooling. D. Vapor/Liquid Separators: The system shall have vapor/liquid separators, with secondary containment, located upstream of both vacuum blowers. The vapor/liquid separators shall be sized to handle the quantity of air and the type of contaminants moving through the inlets, and they shall remove entrained water droplets. The system shall have automatic water pumps to transfer water from the vapor/liquid separators to the air stripper inlet. The pumps shall provide a discharge pressure of 40 psi (minimum) and a flow of 5 gpra at the air stripper inlet tie- in location. Pump motors shall be rated for DIV I, Class 2 service. Vapor/liquid separators and pumps shall be remote mounted. E. Burner/Gas Train: The gas train shall be fabricated to Factory Mutual ("FM") specifications. The burner shall be a propane type with an integral combustion air fan, as required. The combustion shall utilize process air, when possible, instead of fresh air to keep the overall system size and operating cost to a minimum. Complete FM approval is required. The burner shall be mounted in the horizontal plane to allow the flame to fire in the direction of airflow. Uniform temperature entering the catalyst shall be achieved by proper air distribution over the burner and mixing plates located downstream of the burner. The burner shall be selected to bring the reactor up to catalyst ready temperature with ambient air during startup. The burner shall have the capacity to maintain system operating temperatures during VOC free, full air flow conditions. The expected system heat-up time shall be approximately 15 to 80 minutes from cold start. F. Reactor: The catalytic oxidizer reactor interior shall be constructed of 300 series stainless steel. The exterior shell shall be designed to resist corrosion. High density insulating board shall be placed between the inner and outer shells to maintain external skin temperature at safe levels. The catalyst shall be contained in a fully welded 300 series stainless steel bed configuration with high temperature gasketing to ensure no VOC bypass. A door allowing access to the reactor shall be supplied for ease of servicing and inspection of the catalyst and the interior of the reactor. Temperature sensors shall be located before and after the catalyst bed for proper control of temperature within the reactor. 13270-5 (EKI 940058.00) TUT OO8 (X G. Catalyst: The catalyst shall be suitable for chlorinated hydrocarbon reaction and to achieve the destruction efficiency as specified in 2.2.A. The catalyst shall be positioned to maintain uniform airflow and temperature throughout the catalyst bed. H. Heat Exchanger: A shell and tube type heat exchanger (50 percent efficient) shall be supplied to preheat the incoming air stream and reduce auxiliary fuel consumption. The heat exchanger shall be constructed of 300 series stainless steel and be continuously welded around all seams. Each weld shall be leak tested for assurance of no cross contamination. The air containing VOCs shall pass through the tube side of the exchanger and the hot purified air shall pass through the shell side. Multiple passes on the shell side shall be designed to approach true counter flow conditions within the exchanger. I. Exhaust Stack: A no-loss type exhaust stack with easily accessible sampling ports shall be provided. EQUIPMENT SUPPLIER shall design the catalytic oxidizer unit to support the weight of the exhaust stack. The height of the exhaust stack shall be 20 feet above ground surface. The diameter of the exhaust stack shall be 10-inches. Within the container, the exhaust stack shall be insulated. J. System Controls and Safety Shutdowns: The fully automatic controls of the system shall be divided into the following categories: 1. Start-up Mode With Fresh Air Damper: The start-up sequence shall be as follows: a. The oxidizer shall be brought up to reactor temperature independent of the process using outside air via the fresh air inlet damper. This ensures the system will be cleansed of any residual VOC hydrocarbon vapors. b. Only when the reactor is brought up to operating temperature can the process inlet damper be opened, allowing VOC vapors into the system for destruction. 2. Burner and Flame Safety Supervision: The flame safeguard control shall monitor the pilot so that the primary gas valves cannot open until the pilot flame has been established and proven. The gas burner piping system shall consist of an IRI rated gas pipe train including the following components: 13270-6 (EKI 940058.00) a. Main gas valve. b. Vent valve. c. Blocking valve. d. High and low gas pressure switches with shutdown interlocks. e. Gas regulator (vented to outside of the container for release of gas or vapors) . f. Spark arrestor with shutdown interlock. An electronic flame safeguard control of the flame rod type shall monitor the flame during the entire burning cycle. This control shall provide the following sequence: a. A prepurge of 90 seconds. b. Pilot proving prior to the energizing of the main valve. c. Trial for ignition of main flame for 10 seconds. In the event of flame failure during a firing period, the main fuel valves shall be deenergized and signal a shutdown interlock. Manual reset shall be required at the flame supervision control located in the main control cabinet. 3. System Safety Controls: The following shall be a typical control safety sequence for vapor processing, as VOC load increases. a. The inlet temperature controller shall reduce the burning firing rate. b. If the concentration continues to produce an exotherm that exceeds the preset high limit temperature, a signal shall be sent to a controller to initiate the bypass of the heat exchanger. c. A sustained outlet temperature above the high preset limit shall initiate a system shutdown. During a shutdown an alarm signal shall be sent to the main system control panel. Operator start-up sequence must then be reinstituted. 4. Safety Shut-Down Controls: A number of safety features shall be an integral part of the system controls design as standard equipment. In addition to FM-approved gas trains, airflow switches, high limits and safety shutdowns shall protect the system. Any safety shutdown shall initiate an alarm and send the signal to the main system control panel. The shutdowns shall include: 13270—7 (EKI 940058.00) TUT' 008 o:: a. Low air flow. b. High catalyst exit temperature. c. High liquid level in vapor/liquid separator. d. High temperature in sound enclosure. e. Loss of Power. f. Flame out of the burner. 5. Normal Shut-Down Controls: Provide a 5-minute adjustable time delay on any normal shut-down of the catalytic oxidizer so that the catalytic oxidizer will remain operating until other treatment units are shut-down. 6. Recording: Standard controls shall consist of state-of- the-art digital temperature and pressure controllers, timers, relays, and switches in a NEMA 3R enclosure (plastic). The control panel shall include necessary displays for system status indication. A hard copy temperature and flow recorder/controller shall be supplied to control and monitor the inlet and outlet temperatures and flow of the oxidizer. 7. Sample Ports: Provide a minimum of four easibly accessible sample ports: 1) one on the AS inlet; 2) one on the SVE inlet; 3) one on the exhaust stack; and 4) one on the dilution air line. K. System Testing: The EQUIPMENT SUPPLIER shall test the catalytic oxidizer at their facility to ensure that all equipment functions properly. The test shall be witnessed by the ENGINEER. L. Manufacturer's Service Representative: 1. Shop Testing: Once the catalytic oxidizer is connected to the rest of the treatment plant, the complete treatment plant will be tested at the shop where it has been assembled. At the option of the Owner, a factory trained service technician shall be supplied for one day to provide assistance for this shop test. The shop test will be conducted in Campbell, California. 2. Start-Up Assistance: A factory trained service technician shall be supplied for five days to startup and balance the catalytic oxidizer system at the Texaco Tutu Service Station in St. Thomas, U.S. Virgin Islands. Also included is the confirmation testing as described in 3.2.A. 3. Instruction of OWNER'S Personnel: The EQUIPMENT SUPPLIER shall provide for the services of a factory service representative for one day to instruct the OWNER'S personnel in the operation and maintenance of the 13270-8 (EKI 940058.00) equipment. This shall be included in the five day startup service above. M. liald Procedures: Instructions for field procedures for erection, adjustments, inspection, and testing shall be provided prior to installation of each piece of equipment. 2.4 Guarantees, Warranties A. A 2-year warranty shall be provided for the catalytic oxidizer unit and its components. It shall warrant the unit from the date of receipt of equipment at CONTRACTORS shop (1) to be free of any defects in materials and/or workmanship at the time of sale, and (2) to satisfy the catalytic oxidizer performance criteria included in these specifications. B. The expected catalyst life shall be approximately 18,000 hours of operation with minimal catalyst addition. 2.5 Manufacturers, or Equal A. King, Buck & Associates, Inc., San Diego, California. PART 3 — EXECUTION 3.1 Delivery A. Deliver the skid-mounted catalytic oxidizer to Campbell, California within 10 weeks of receipt of purchase order of equipment (assume shop drawings will be reviewed by ENGINEER within 5 days). 3.2 Confirmation Testing B. Provide confirmation testing (EPA Method 8015 with BTEX and MTBE distinction and EPA Method 8010 modified) at start-up to demonstrate compliance with performance requirements described in these specifications. 13270—9 (EKI 940058.00) TUT' OOB <r:'i<:?4 Erler & Kalinowski, Inc. B-4. Performance Monitoring Monitoring of SVE system performance will begin during the start-up of the system. The following monitoring will be performed during the first six months of operations: 1) Soil vapor sampling at the SVE wellheads, the groundwater air stripper exhaust, the combined catalytic oxidizer influent, and the combined catalytic oxidizer effluent. 2) A one-time radius of influence test for each SVE well. Proposed monitoring parameters and monitoring frequency for the start-up and shakedown period, i.e. the first six months of system operation, are discussed below. A long term monitoring plan will be submitted to regulatory agencies within 45 days of the end of six months of full time system operation. B-4.1 Soil Vapor Sampling At system start-up, soil vapor at each SVE wellhead, exhaust gas from the groundwater air stripper (discussed in Section C), and the combined catalytic oxidizer influent and effluent vapor streams will be sampled. The soil vapor samples will be collected in "Summa" vacuum canisters or Tedlar bags and analyzed for petroleum hydrocarbons, BTEX, and MTBE by ERA Method 8015/8020 (modified) and for chlorinated VOCs by ERA Method 8010. This initial sampling will determine initial SVE well vapor-phase concentrations and confirm that the catalytic oxidizer meets specified destruction efficiencies. Following system start-up, monthly sampling at the same locations will be performed with a PID for the first six months of system operation. Data generated during monthly sampling will be used to monitor the effectiveness of the SVE system and catalytic oxidizer. B-4.2 SVE Well Vacuum Testing Once equilibrium operating conditions have been established, the radius of influence of each SVE well will be determined by performing a vacuum influence test. The radius of influence will be determined by creating about 6 inches of mercury vacuum at each extraction well and measuring the amount of vacuum at monitoring points located around 10 to 30 feet from each of the three vapor extraction wells. If there is no influence at the monitoring points with a vacuum of 6 inches of mercury, the vacuum will be increased to 8 inches of mercury. If increasing the vacuum to 8 inches of mercury does not result in an adequate radius of influence, then additional SVE well installation will be evaluated. This evaluation will consider: (1) the radius of influence for each well, (2) the mass of TUT COS O396 B-4.1 Section B (EKI 940058.03) Erler & Kalinowski, Inc. *> chemicals of concern being extracted from the vadose zone from each well, (3) any additional soil data for the site, and (4) capital and operation costs. B-4.3 Completion of SVE Remedial Action The mass removal rate of chemicals of concern will be considered no longer significant and the remedial action of a particular SVE well complete when any one of the three following alternative performance standards is satisfied: 1) Three sets of extracted gas concentration monitoring results show that all of the three following criteria are met: a) the extracted gas concentration of volatile petroleum hydrocarbons (including BTEX) is less than ten (10%) of its value at the time of startup or less than the Practical Quantitation Limit ("PQL"), whichever is greater; and b) the extracted gas concentration of petroleum hydrocarbons, in the most recent year of operation, has been reduced by less than ten percent (10%) of its value at the start of the year, or is less than the PQL, whichever is greater and J*"»«S c) the total aggregate removal rate for the petroleum hydrocarbons is less than three (3) pounds per day per 100 standard cubic feet per minute ("SCFM") of vapor removed. 2) Three sets of extracted gas concentration monitoring results, at intervals established in the approved Monitoring Plan, show that the extracted gas concentration of petroleum hydrocarbons is less than one percent (1 %) of its value at the time of startup or less than the PQL, whichever is greater. 3) Three years of SVE system operation have been completed and three sets of extracted gas concentration monitoring results, at intervals established in the approved Monitoring Plan, show that the extracted gas concentration of petroleum hydrocarbons is less than ten percent (10%) of its value at the time of startup or less than the PQL, whichever is greater. B-4.2 Section 3 (EM 940058.03) /•—v Erler & Kalinowski, Inc. B-5. System Operation B-5.1 Expected Operations Schedule The SVE system, as part of the overall remediation system at the Service Station Site, will be operated on a 24-hour basis. Based on experience with similar systems, system up-time is expected to be in the range of 90%-95%, or from 328 to 347 days per year. It is expected that operational difficulties will most likely be experienced at the beginning of system operation. As the system is adjusted, increased up-time is anticipated. B-5.2 Instrumentation and Control The SVE system, together with the groundwater extraction system, will be automatically controlled. The SVE system is designed with shutdowns and interlocks to prevent the discharge of untreated vapor to the atmosphere. As an example, if the catalytic oxidizer is not operating within specified parameters, the entire extraction system will be shut down and the operations personnel will be automatically notified of the shutdown by an autodialer system. It is anticipated that the O&M personnel will respond to the signal within a few hours. The Service Station Site control description and equipment list are given in Table B-5.1. The control system shows the shutdowns and interlocks for the SVE system as well as the groundwater extraction system. During the final design a complete Process and Instrumentation Diagram (P&ID) will be prepared that will show the complete instrumentation of the SVE system. TUT QO8 B-5.1 Section B (EKI 940058.03) TABLE B-5.1 TEXACO TUTU SERVICE STATION CONTROL DESCRIPTION & EQUIPMENT LIST Texaco Tutu, U.S. Virgin Islands (EKI 940058.05) EQUIPMENT ELECTRICAL GROUNDWATER PUMPS (To be supplied by Contractor) CHEMICAL FEED SYSTEM (To be supplied by Contractor) AIR STRIPPER (Owner furnished) POWER REQMTS 230V 1 Phase 60 Hz 230V 1 Phase 60 Hz 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Remote panel Power loss at panel => Air Flow Meter Temperature gauges Air Blower Silencer Line Sample Ports Low Air Pressure Alarm => (w/adjustable time delay) High Water level Alarm => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BY CONTR (3) Current sensor type <= protection device Power loss at <= chemical feed pump FIRST OUT PANEL (4) YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES Li.; (EKI 940058.03) TABLE B-5.1 TEXACO TUTU SERVICE STATION CONTROL DESCRIPTION & EQUIPMENT LIST Texaco Tutu, U.S. Virgin Islands (EKI 940058.05) EQUIPMENT CATALYTIC OXIDIZER (Owner furnished) POWER REQMTS 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Low air flow => High catalyst exit => temperature Liquid Level Switch if high => liquid in V/L separator High temperature in sound => enclosure Power loss at panel => High or low gas pressure => Flame failure => Spark arrestor => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BY CONTR (3) FIRST OUT PANEL (4) YES YES YES YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES YES YES YES NOTES: 1. These are the control options that are included by the manufacturer with the equipment. If any one of these alarm conditions occurs, a signal will be sent from that piece of equipment that an alarm condition has been detected. 2. This indicates what should occur if the indicated alarm condition is detected. 3. These are the control options that shall be designed and installed by the CONTRACTOR. 4. A Yes indicates that if the indicated alarm condition is detected, it should be indicated on a First Out Panel. 5. A Yes indicates that if the alarm condition is detected, it should activate the autodialer. c XI S (EKI 940058.03) Erler & Kalinowski, Inc. B-6. Contingencies Assumptions used in the design of the SVE system, with respect to vacuum rate and the number of SVE wells, may be revised based on observed conditions and/or vacuum influence testing. Possible contingency plans are summarized below. B-6.1 Vacuum Adjustment / Additional Wells Based on prior experience with SVE systems in this type of soil, it is estimated that a vacuum of six (6) inches of mercury at a given well will result in a radius of influence of approximately 20 feet. If the results of the vacuum influence test (to be performed during system startup) indicate that the radius of influence is less than 20 feet, the vacuum will be increased to as much as 8 inches of mercury. If increasing the vacuum to 8 inches of mercury does not result in an adequate radius of influence, then installation of additional SVE wells will be evaluated. TUT' 008 040: B-6.1 Section B (EKI 940058.03) u. c-i Oo 03 This Page Was Intentionally Left Blank. OO8 O4O6 Erler & Kalinowski, Inc. SECTION C - GROUNDWATER EXTRACTION SYSTEMS C-1. Remedial Goals The proposed groundwater remediation systems are designed to capture groundwater impacted by petroleum hydrocarbons at the down-gradient property line of the Service Station Site and near the northern boundary of the Vitelco Site (Figure C-1.1). Based on a review of available analytical data, the occurrence of benzene in groundwater can be used as an indicator of impact by petroleum hydrocarbons. The distribution of benzene detected in groundwater samples (collected between May and June 1994) is presented on Figure C-1.2. The analytical data for benzene are also presented on cross sections (Figures C-1.3 and C-1.4) to illustrate the vertical distribution of benzene in the petroleum hydrocarbon plume. The remedial goal for operation of the groundwater system is to reduce concentrations of chemicals of concern detected in groundwater from monitoring wells, located within the petroleum hydrocarbon plume, to achieve compliance with Federal Drinking Water Maximum Contaminant Levels (MCLs). The chemicals of concern and the corresponding federal MCLs are presented in Table C-1.1. For chlorinated VOCs, achievement of the remedial goals may be difficult, however. For example, if groundwater migrating onto the Texaco Property contains concentrations of chlorinated VOCs above MCLs, the remedial goals for these chemicals may not be achievable. If this is the case, the remedial goals for chlorinated VOCs may need to be modified to take into account upgradient chemical concentrations. (For additional discussion, please see Section B-6.2). The remedial goals for inorganic compounds detected in groundwater are also Federal Drinking Water MCLs. Nevertheless, if groundwater migrating onto the Texaco Property contains concentrations of inorganic compounds above MCLs, these remedial goals also may need to be modified to take into account upgradient and background chemical concentrations. IUI COS G4O C-1.1 Section C (EKJ 940058.03) TABLE C-1.1 Chemicals of Concern and Maximum Contaminant Levels Texaco Tutu, U.S. Virgin Islands (EKI 940058.03) Parameter Benzene Toluene Ethylbenzene Xylenes (Total) 1,2-Dichloroethane (DCA) 1,2-Dichloroethene (DCE) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Methylene Chloride Current Federal MCLs(1,2) 5 1000 700 10 ppm 5 70 5 5 2 5 NOTES: 1. MCL values shown are from EPA Region IX, "Drinking Water Standards and Health Advisories Table", January 1995. 2. All concentrations are in ppb unless noted otherwise. C-1-1.XLS •TUT 008 0408 06/19/95 ERA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-1.1 CONCEPTUAL SITE LAYOUT FOR TEXACO AND VITELCO PROPERTIES (Page: TUT 008 0409) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 ERA REGION li SCANNING TRACKING SHEET DOC ID # 65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-1.2 CONCENTRATIONS OF BENZENE (UG/L) DETECTED IN GROUNDWATER MAY - JUNE 1994 (Page: TUT 008 0410) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-1.3 BENZENE CONCENTRATIONS (UG/L) IN GROUNDWATER ALONG SECTION A-A' (UG/L) (Page: TUT 008 0411) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID # 65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-1.4 BENZENE CONCENTRATIONS (UG/L) DETECTED IN GROUNDWATER ALONG SECTION B-B' (UG/L) (Page: TUT 008 0412) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 CM Erier & Kalinowski, inc. C-2. Volume of Groundwater to be Remediated Based on the delineation of the plume presented on Figure C-1.2 in Sub Section C-1, an area of approximately 70,000 square feet is impacted by petroleum hydrocarbons. Because gasoline is less dense than water, dissolved chemical plumes down- gradient of gasoline releases are typically shallow and do not commonly extend to great depths. At the Texaco Tutu Station, however, BTEX compounds have been detected at elevated concentrations in water from the deep monitoring well TT-1D. In addition, such compounds have been detected in groundwater from the Tillett well. This vertical distribution suggests that chemicals of concern may have been drawn downward, possibly under the influence of pumping from the Tillett well. Assuming this is the case, the vertical extent of chemicals which emanate from the Texaco Tutu Station .is assumed to be as much as 100 feet deep, the depth of the bottom of the Tillett well (Figure C-1.3) in Sub Section C- 1. Assuming that petroleum hydrocarbons are present to a depth of 100 feet below ground surface (bgs), that groundwater is encountered at a depth of 15 feet bgs, and that the porosity of the water-bearing zone is 0.1, the volume of groundwater potentially impacted by petroleum hydrocarbons is approximately 52 million gallons. EKI has estimated the groundwater extraction volumes required to capture the petroleum hydrocarbon plume using a simple hydrogeological computer model of the Service Station Site and surrounding areas. The required extraction volumes are estimated to be approximately 20 to 50 gallons per minute ("gprn") at the Texaco Site and 5 to 20 gpm at the Vitelco Site. Groundwater at both locations will be extracted from well pairs consisting of a shallow extraction well screened from an elevation of approximately 140 to 170 feet mean sea level ("msl"), and a deep extraction well screened from approximately 90 to 130 feet msl. The estimated zone of capture for the proposed system with extraction at 20 gpm from a single well pair at the Texaco Site and 10 gpm from a single well pair at the Vitelco Site is presented on Figure C-2.1. A schematic of the zone of capture in vertical cross section is presented on Figures C-2.2 and C-2.3. At the present time, extraction from a second well pair at the Service Station Site is also planned. However, if site access makes installation of these additional wells impossible, the system may be installed with a single well pair. TUT COS O414 C-2.1 Section C (EKI 940058.03) EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-2.1 ESTIMATED ZONE OF CAPTURE (Page: TUT 008 0415) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-2.2 SCHEMATIC OF GROUNDWATER ZONE OF CAPTURE ALONG SECTION A-A' (UG/L) (Page: TUT 008 0416) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 ERA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE FIGURE C-2.3 SCHEMATIC OF GROUNDWATER ZONE OF CAPTURE ALONG SECTION B-B' (Page: TUT 008 0417) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 TUT 008 '04; Erler & Kalinowski, Inc. C-3. Treatment Criteria C-3.1 Assumed Groundwater Influent Concentrations Assumed groundwater influent concentrations are given in Table 1 of the April Report, 1. The back-up spreadsheets used to calculate the concentrations shown in Table 1 of the April Report are included as Table C-3.1, C-3.1A, C-3.2, C-3.2A, C-3.3, and C-3.3A. In addition to showing the backup calculations for the concentrations in Table 1 of the April Report, these tables show the percent removal of each chemical of concern at the Service Station Site and the Vitelco Site by the air-stripping process, the chemical concentrations and mass remaining in the water, and the calculated mass in the air discharged from the air stripper. C-3.2 TPDES Discharge Requirements Texaco submitted an application to DPNR for a Territorial Pollutant Discharge Elimination System {"TPDES") permit in May 1995. This TPDES permit application requests that DPNR allow discharge of the treated groundwater from the Service Station Site and the Vitelco Site to the existing St. Thomas storm sewer system. This storm sewer system discharges to territorial receiving waters of the U.S., specifically to Turpentine Run and Jersey Bay. The treated water discharge will meet current Federal MCLs. Table 3 of the April Report shows the range of typical expected effluent concentrations and expected maximum effluent concentrations for chemicals of concern. The concentrations shown in Table 3 are the same as those submitted in the TPDES permit application. The treatment system is designed to produce treated water within the typical expected effluent concentrations. C-3.3 Treatment of Air Discharged from the Air-Stripper by the Catalytic Oxidizer Extracted groundwater will be treated at both the Service Station Site and the Vitelco Site by an air-stripper. At the Service Station Site, the air stripper air flow rate of 900 scfm will be produced by the catalytic oxidizer blower. The catalytic oxidizer blower will induce the air flow by creating a 6-inch Hg vacuum at the air stripper. The catalytic oxidizer will treat both the air discharged form the air stripper and the vapor from the SVE system. The catalytic oxidizer is described in Section B-3.3. At the Vitelco Site, the air stripper blower will produce a 150 scfm air flow rate. The air emissions at this location will be discharged directly to the atmosphere. The air stripper specifications follow. The catalytic oxidizer specifications are included in Section B-3. TUT 008 C-3.1 Section C (EK) 940058.03) Erl0r & Kalinowski, Inc. C-3.4 Estimated Air Emissions Based on discussions with the DPNR, air discharge limits or permitting requirements have not been promulgated for remediation facilities for the U.S. Virgin Islands. Air emissions of benzene, 1,2-dichloroethane, trichloroethene, tetrachloroethene, vinyl chloride and methylene chloride are of potential concern because these chemicals have been identified as human carcinogens (Class A) or probable human carcinogens (Class B2) (EPA, 1994). EPA uses a general risk range of 10"4 to 10"6 (the probability that an individual will contract cancer over a 70 year lifetime due to exposure to chemicals of concern) as an acceptable "target range" for cleanup (EPA, 1990). Table C-3.4 (revised from Table 5, page 1, in the April Report) shows estimated air emissions of these chemicals of concern, catalytic oxidation destruction efficiencies, estimated treated air emissions and estimated hydrochloric acid emissions following catalytic oxidation destruction at the Service Station Site. Table C-3.5 (revised from Table 5, page 2, of the April Report) shows estimated air emissions of the chemicals of concern at the Vitelco Site. The catalytic oxidizer destruction efficiencies specified for the unit that will be manufactured specifically for the Service Station Site are based on typical, achievable destruction efficiencies for catalytic oxidizers. (The catalytic oxidizer specifications are included in the back of Sub Section B-3.) As discussed below, the air emissions from the catalytic oxidizer at the Service Station Site and the Vitelco Site air stripper are expected to be within the risk range of 10"6. HCI will be formed as a result of the destruction of chlorinated VOCs. Estimated emissions of HCI are calculated to be on the order of 3 Ib/day. The risk screening analysis method used for both the Service Station Site and the Vitelco Site is based on the EPA Risk Assessment Guidance for Superfund (EPA, 1989) and EPA's Supplemental Guidance entitled "Standard Default Exposure Factors" (EPA, 1991). Three populations are considered in the evaluation of estimated incremental lifetime cancer risk due to inhalation of chemicals of concern emitted from the remediation system: 1) on-site employee risk; 2) off-site resident risk; and 3) off-site school student risk. Summary Table C-3.6 for both Sites, Detailed Risk Analysis Tables C-3.7 through C-3.9 for the Vitelco Property, and SCREEN2 simulation results for the Vitelco Property are included at the end of this Sub Section. Results of the risk analysis for EPA carcinogens are described below. Service Station Site detailed risk analysis tables, EPA guidance formulas, back-up calculations, air model assumptions, and SCREEN2 simulation results are included in the back of Sub Section B-3. TUT 006 O42O C-3.2 Section C (EKI 940058.03) Erler & Kalinowski, Inc. Texaco Service Station: At the Service Station Site, benzene emissions from the soil vapor extraction system and the groundwater treatment system, without emissions control, are estimated to be on the order of up to 15 Ib/day. Due to this potentially significant mass, air emissions treatment by catalytic oxidation has been included in the remedial design for this location. A risk screening analysis was completed to estimate the incremental potential lifetime cancer risk due to exposure to treated air emissions from the Service Station Site remediation system. Based on estimated air emission rates and the results of emission scenarios calculated from an EPA approved air dispersion model (SCREEN2 ,1 993), health risk analyses were completed for on-site employees, off-site residents, and off-site school students due to exposure to the maximum calculated concentration at ground level. The results are summarized in Table C-3.6. The estimated incremental lifetime cancer risk for on-site employees at the Service Station Site, assuming a 25 year exposure duration, is estimated to be 1.0 x 10"6. For off-site residents, the incremental lifetime cancer risk, assuming a 30 year exposure, is estimated to be 5.0 x 10~7. The estimated incremental lifetime cancer risk for off-site students, assuming an 8 year exposure, is /*••> estimated to be 4.0 x 10"8. The risks are weighted toward the assumed benzene and vinyl chloride emissions. In response to a comment from ERA, an additional analysis was completed to look at the potential effects on risk due to hypothetical higher, simultaneous vinyl chloride and benzene levels. If the vinyl chloride emission rate increased to 2.7 x 10"4 g/s ( increasing the influent concentration to approximately 2 ppm from the assumed 100 ppb) and the benzene emission rate increased to 1.3 x 10'3g/s (doubling the groundwater influent concentration to 34 ppm from the assumed 17 ppm) the estimated incremental lifetime cancer risk would be 5.0 x 10"6 for on-site employees assuming a 25 year exposure duration and 2.0 x 10"6 for on-site employees assuming a 1 0 year exposure duration. The long term analyses may be conservative inasmuch as the exposure durations of 25 years for on-site employees, and 30 years for off-site residents are likely two to three times the probable operational life of the remediation system. In addition, the chemical concentrations for the soil vapor extraction are expected to significantly decline within a few years. Therefore, it can be assumed that with the specified catalytic oxidizer destruction efficiencies, the conservative exposure durations used, and the expected reduction of chemicals from the soil vapor extraction sytem, there is adequate / ru'f\ 008 0421 C-3.3 Section C (EKI 940058.03) Erler & Kalinowski, Inc. flexibility in the system to treat higher than assumed influent concentrations without increasing the estimated incremental lifetime cancer risk above 10" 8. Vitelco Site: A risk screening analysis was also completed to estimate the incremental lifetime cancer risk due to air emissions directly to the atmosphere from the remediation system at the Vitelco Site. This system is not planned to have air emissions treatment. Based on estimated air emission rates and air concentrations calculated from two simulations performed using SCREEN2, health risk analyses were completed for on-site employees and off-site school students due to exposure to the calculated maximum air ground concentration. Results of the SCREEN2 simulation indicates that there would be no detectable air concentration of chemicals of concern at ground level at a distance of 24 meters (80 feet) from the site, the location of the nearest residence. The estimated incremental lifetime cancer risk for on-site employees at the Vitelco property location, assuming a 25 year exposure duration, is estimated to be 7.0 x 10" 7 The estimated incremental lifetime cancer risk for off-site school students, assuming an 8 year exposure duration, is estimated to be 1.0 x 10' 7 The risks are weighted toward the vinyl chloride emission. The vinyl chloride emission rate shown in Table C-3.7, 5.2 x 10"5g/s, is based on the assumed design influent groundwater concentration of 10 ppb. Vinyl chloride has not been detected to date in groundwater monitoring well MW-7 at the Vitelco Site. In response to a comment from ERA, we looked at the potential effects on risk due to hypothetical high vinyl chloride concentrations. Table C-3.8 shows that if the vinyl chloride emission rate increased to 1.2 x 10" 4 g/s (increasing the influent concentration to approximately 100 ppb from the assumed 10 ppb) then the estimated incremental lifetime cancer risk would be 2.0 x 10" 6 for on-site employees assuming a 25 year exposure duration and 6.0 x 10" r assuming a 10 year exposure duration. In addition, the long term analyses, at least for on-site employees, may be conservative inasmuch as the exposure durations are likely two to three times the probable operational life of the system. Based on the estimated incremental lifetime cancer risks and the conservative exposure durations used, it is assumed that emissions control will not be required at the Vitelco Site. However, if actual air emissions differ significantly from the estimated emission rates, further risk screening analysis will be conducted. If required, a catalytic oxidizer or other appropriate air emissions treatment unit will be added to treatment process. C-3.4 Section C (EKI 940058.03) EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE TABLE C-3.1 TEXACO SERVICE STATION ORGANIC CONCENTRATIONS: GROUNDWATER & VAPOR PHASE (1) (Page: TUT 008 0423) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 ERA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE TABLE C-3.1A TEXACO SERVICE STATION ORGANIC CONCENTRATIONS: GROUNDWATER & VAPOR PHASE (1) (Page: TUT 008 0424) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID # 65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE TABLE C-3.2 VITELCO PROPERTY ORGANIC CONCENTRATIONS: GROUNDWATER & VAPOR PHASE (1) (Page: TUT 008 0425) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID # 65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE TABLE C-3.2A VITELCO PROPERTY ORGANIC CONCENTRATIONS: GROUNDWATER & VAPOR PHASE (1) (Page: TUT 008 0426) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE TABLE C-3.3 TEXACO SERVICE STATION & VITELCO PROPERTY INORGANIC CONCENTRATIONS: GROUNDWATER (Page: TUT 008 0427) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE TABLE C-3.3A TEXACO SERVICE STATION & VITELCO PROPERTY INORGANIC CONCENTRATIONS: GROUNDWATER (1) (Page: TUT 008 0428) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18™ FLOOR NEW YORK, NY 10007 TABLE C-3.4 ESTIMATED AIR EMISSIONS Texaco Tutu, U.S. Virgin Islands (EKI 940058.03) CHEMICALS OF CONCERN Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (DCA) 1 ,2-Dichloroethene (DCE) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl Chloride Methylene Chloride TEXACO TUTU SERVICE STATION with Emissions Control (1) Mass in Air Air Stripper Ib/day (2) 10 9 2 8 0.2 0.3 0.03 0.03 0.06 2 Mass in Air SVE Ib/day (3) 5 6 1 4' 0.01 0.25 0.01 0.02 0.1 1 Total Mass in Air Ib/day 15 15 3 12 0.21 0.55 0.04 0.05 0.16 3 Cat-Ox Destruction %(4) 99 99 99 99 96 96 96 96 96 96 Treated Air Emissions Ib/day 0.15 0.15 0.03 0.12 0.01 0.02 0.002 0.002 0.01 0.14 Treated Air Emissions g/s 7.7E-04 8.0E-04 1.7E-04 6.4E-04 4.4E-05 1.2E-04 8.4E-06 1.0E-05 3.4E-05 7.1E-04 SUM HCI (pounds per day) HCI Emissions (5) - - - 0.1 0.4 0.05 0.05 0.2 2.2 3.0 1. Off-gas from the air stripper and SVE will be treated by catalytic oxidation. 2. Assumed air mass is based on estimated removal rates of chemicals by air stripping as shown on Table C-3.1 3. Assumed SVE air mass is estimated from groundwater data as shown on Table B-4.1. Levels are expected to decrease with time. 4. Catalytic Oxidizer destruction efficiencies are specified in equipment Specification Section 13270. 5. Assumed hydrochloric acid (HCI) emitted to the atmosphere after air treatment by catalytic oxidation, in pounds per day. 6. Totals may be rounded. 7. This table is a revision of Table 5 included in the Groundwater and Soils Remediation Program Report dated 13 April 1995. C3-4.XLS (940058.03) TABLE C-3.5 ESTIMATED AIR EMISSIONS Vitelco Property Texaco Tutu, U.S. Virgin Islands (EKI 940058.03) CHEMICALS OF CONCERN Benzene Toluene Ethylbenzene Xylenes 1,2-Dichloroethane (DCA) 1,2-Dichloroethene (DCE) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Methylene Chloride VITELCO PROPERTY without Emissions Control (5) Air Emissions Ib/day (2) 0.007 0.002 0.002 0.002 0.001 0.10 0.03 0.01 0.01 0.002 Air Emissions g/s 3.7E-05 1.3E-05 1.3E-05 1.3E-05 5.2E-06 5.0E-04 1.6E-04 4.7E-05 5.2E-05 1.0E-05 1. Off-gas vapors from the air stripper will be vented directly to the atmosphere. 2. Assumed air mass is based on removal rates by air stripping. 3. This table is a revision of Table 5, page 2, included in the Groundwater and Soils Remediation Program Report dated 13 April 1995. TUT OOS 043O C3-5.XLS EKI (940058.03) TABLE C-3.6 AIR EMISSIONS SUMMARY OF HEALTH RISK ANALYSIS FOR EPA CARCINOGENS Tutu Texaco Service Station (EKI 940058.03) LOCATION Texaco Service Station Viteico Property ESTIMATED INCREMENTAL LIFETIME CANCER RISK On-Site Employees 25 Year Exposure 1.0E-06 5.0E-06 (1) 7.0E-07 2.0E-06 (2) Off-Site Residents 30 Year Exposure 5.0E-07 (3) Off-site Students 8 Year Exposure 4.0E-08 1.0E-07 NOTES: 1. Increased risk based on vinyl chloride and benzene concentrations greater than design concentrations. 2. Increased risk based on vinyl chloride concentrations greater than design concentrations. 3. Viteico property air modeling indicates that air emission concentrations are not detectable at the nearest residence located approximately 24 meters (80 feet) from the emission stack location. TUT CAIRSUM.XLS (EKI 940058.03) RISK ANALYSIS TABLES Sub Section C-3 (Ekl 940058.03) TABLE C-3.7 AIR EMISSIONS - VITELCO SITE HEALTH RISK ANALYSIS FOR EPA CARCINOGENS Tutu Texaco Service Station On-Site Employees Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1,2-Dichloroethane(DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Methylene Chloride Estimated Emission Rate (9/s) (1) 3.7E-5 5.2E-6 1.6E-4 4.7E-5 5.2E-5 1.0E-5 Maximum Ground Concentration for 1g/s Emission Rate (ug/m3) (2) 606.5 606.5 606.5 606.5 606.5 606.5 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) <3) 2.2E-2 3.2E-3 9.5E-2 2.9E-2 3.2E-2 6.4E-3 Chronic Daily Intake (mg/(kg -d)) (4,5) 1.6E-6 2.2E-7 6.7E-6 2.0E-6 2.2E-6 4.4E-7 Slope Factor (1/mg/(kg-d)) 2.GE-2 (6) 9.1E-2 (6) 2.0E-3 (7) 6.0E-3 (8) 2.9E-1 (8) 1.6E-3 (6) Estimated Incremental Lifetime Cancer Risk (25 Year Exposure) (9) 4.5E-8 2.0E-8 1.4E-8 1.2E-8 6.5E-7 7.3E-10 Total Maximum Incremental Cancer Risk 7.0E-7 Estimated Incremental Lifetime Cancer Risk (10 Year Exposure) (9) 1.8E-8 8.1E-9 5.4E-9 4.8E-9 2.6E-7 2.9E-10 3.0E-7 1 Emission rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. 2 Maximum lona term impact at a height of 4 meters above the stack base and located 29 meters (95 ft) away from the stack based on a 1 g/s total clirS (10% of one hour value obtained using SCREEN2 program. Model No. 1, 150 SCFM. simple terrain downwash from Mike's Paints, Stack ht =4.9 meters (16 ft)) , « / • • » 3 Maximum ground concentration = estimated emission rate x maximum ground concentration for 1 g/s emission rate 4 On-site exposure factors' inhalation Rate = 2.5 m3/hr for 8 hours/day; exposure frequency = 250 days/year; averaging time = 70 years x 365 days/year si Chronic Daily Intake = (maximum ground concentration x inhalation rate x exposure frequency x exposure duration)/ (averaging time x body weight of 70 kg) 6 Slope factors are converted from unit risk factors included in IRIS (1995). 7 Slope factors are converted from unit risk factors included in U.S. EPA Health Assesment documents. 8 Slope factors are converted from unit risk factors included in the U.S. EPA Health Effects Assessment Summary Tables, FY 1994 Annual, fi' FstimatPd incremental Lifetime Cancer Risk Averaged over 70 years with 25 years of exposure = (chronic daily intake x slope factor) 10. EsSatedS Averaged over 70 years with 10 years of exposure = Estimated Incremental Lifetime Cancer Risk (25 Year Exposure) x (10/25) 11. Totals may be rounded. (EKI 840058 03) TABLE C-3.8 AIR EMISSIONS - VITELCO SITE HEALTH RISK ANALYSIS FOR ERA CARCINOGENS Hypothetical Increase In Vinyl Chloride Emission Rate Tutu Texaco Service Station On-Site Employees Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1,2-Dichloroethane (DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Methylene Chloride Estimated Emission Rate (g/s) (1) 3.7E-5 5.2E-6 1.6E-4 4.7E-5 1.0E-5 Maximum Ground Concentration for 1g/s Emission Rate (ug/m3) (2) 606.5 606.5 606.5 606.5 606.5 606.5 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) (3) 2.2E-2 3.2E-3 9.5E-2 2.9E-2 7.3E-2 6.4E-3 Chronic Daily Intake (mg/(kg -d)) (4,5) 1.6E-6 2.2E-7 6.7E-6 2.0E-6 5.1 E-6 4.4E-7 Slope Factor (1/mg/(kg-d)) 2.9E-2 (6) 9.1E-2 (6) 2.0E-3 (7) 6.0E-3 (8) 2.9E-1 (8) 1.6E-3 (6) Estimated Incremental Lifetime Cancer Risk (25 Year Exposure) (9) 4.5E-8 2.0E-8 1.4E-8 1.2E-8 1.5E-6 7.3E-10 Total Maximum Incremental Cancer Risk 2.0E-6 Estimated Incremental Lifetime Cancer Risk (10 Year Exposure) (8) 1.8E-8 8.1E-9 5.4E-9 4.8E-9 6.0E-7 2.9E-10 6.0E-7 1 Emission rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. 2 Maximum lona term impact at a height of 4 meters above the stack base and located 29 meters (95 ft) away from the stack based on a 1 g/s total ^^S^rKm^lSA (10% of one hour value obtained using SCREEN2 program, Model No. 1.150 SCFM, simple terrain downwash from Mike's Paints. Stack ht =4.9 meters (16 ft)) , « / • • * 3. Maximum ground concentration = estimated emission rate x maximum ground concentrationifor 1 g/s emission rate 4 On-site exposure factors' inhalation Rate = 2.5 m3/hr for 8 hours/day; exposure frequency = 250 days/year; averaging time = 70 years x 365 days/year s'. Chronic Daily Intake = (maximum ground concentration x inhalation rate x exposure frequency x exposure duration)/ (averaging time x body weight of 70 kg) 6. Slope factors are converted from unit risk factors included in IRIS (1995). 7. Slope factors are converted from unit risk factors included in U.S. EPA Health Assesment documents 8 Slope actors are converted from unit risk factors included in the U.S. EPA Health Effects Assessment Summary Tables, FY 1994 Annual. a Estimated incremental Lifetime Cancer Risk Averaged over 70 years with 25 years of exposure = chronic daily intake x slope factor) 10. ISSS^ Averaged over 70 years with 10 years of exposure = Estimated Incremental Lifetime Cancer Risk (25 Year Exposure) x (10/25) 11. Totals may be rounded. (EKI 940058.03) TABLE C-3.9 AIR EMISSIONS - VITELCO SITE HEALTH RISK ANALYSIS FOR ERA CARCINOGENS Tutu Texaco Service Station Off-Site Student Health Risk Analysis (EKI 940058.03) Chemical of Concern Benzene 1,2-Dichloroethane (DCA) Tetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Methylene Chloride Estimated Emission Rate (9/s) (1) 3.7E-5 5.2E-6 1.6E-4 4.7E-5 5.2E-5 1.0E-5 Maximum Ground Concentration for 1g/s Emission Rate (ug/m3) (2) 85.3 85.3 85.3 85.3 85.3 85.3 Maximum Ground Concentration for Estimated Emission Rate (ug/m3) (3) 3.1 E-3 4.5E-4 1.3E-2 4.0E-3 4.5E-3 8.9E-4 Chronic Daily Intake (mg/(kg -d)) (4,5) 1.4E-7 2.0E-8 6.0E-7 1.8E-7 2.0E-7 4.0E-8 Slope Factor (1/mg/(kg-d)) 2.9E-2 (6) 9.1E-2 (6) 2.0E-3 (7) 6.0E-3 (8) 2.9E-1 (8) 1.6E-3 (6) Estimated Incremental Lifetime Cancer Risk 8 Year Exposure (9) 4.1E-9 1.8E-9 1.2E-9 1.1 E-0 5.9E-8 6.6E-11 Total Maximum Incremental Cancer Risk 1 .OE-7 NOTES: 1. Emission rates are based on estimated design mass emissions from groundwater air stripper off gas and soil vapor extraction treated by catalytic oxidation. 2 Maximum long term impact at a height of 6.9 meters (22 ft) above the stack base and located 134 meters (440 ft) northeast from the stack based on a 1 g/s total chemical emission rate from the stack (10% of one hour value obtained using SCREEN2 program, Model No. 1, 150 SCFM. complex terrain downwash from Mike's Paints, Stack ht = 4.9 meters (16 ft) 3 Maximum ground concentration = estimated emission rate x maximum ground concentration for 1 g/s emission rate 4. Student exposure factors: inhalation factor =3.2 m3/hr for 6 hours/day; exposure frequency = 270 days/year; averaging time = 70 years x 365 days/year 5. Chronic Daily Intake = (maximum ground concentration x inhalation rate x exposure frequency x exposure duration)/ (averaging time x body weight of 36 kg) 6. Slope factors are converted from unit risk factors included in IRIS (1995). 7 Slope factors are converted from unit risk factors included in U.S. ERA Health Assesment documents. si Slope factors are converted from unit risk factors included in the U.S. EPA Health Effects Assessment Summary Tables. FY 1994 Annual. Q. Estimated Incremental Lifetime Cancer Risk Averaged over 70 years with 8 years of exposure = (chronic daily intake x slope factor) 10. Totals may be rounded. (EKI 940058.03) C3-9XLS VITELCO PROPERTY SCREEN2 SIMULATION ASSUMPTIONS, RESULTS AND OUTPUT Sub Section C-3 (EKI 940058.03) VITELCO PROPERTY LOCATION AIR MODELING Two model runs using the Screen2 air dispersion model for air emissions emanating from the proposed groundwater treatment system at the Vitelco Property location, St. Thomas, U.S. Virgin Islands are described below. The two model runs were generated to determine the worst-case air emissions scenario and resulting maximum chemical concentration for a 1 g/s emission rate. This concentration is used in the calculation for the incremental carcinogenic risk shown on Tables A4 through AS. The worst-case scenario is Model No. 1, as described' below, showing a maximum concentration of 6,065 ug/m3 at a distance of 29 meters from the stack. The assumptions of the two model runs are described below and the SCREEN2 printout results follow. Model No. 1, "tutuS": Assumptions: • The treatment system is located on flat terrain (approximate elevation 130 feet) • Stack height =4.9 meters above ground surface Stack diameter = 0.09 meters Stack velocity = 12.7 meters/second • Air dispersion is toward the east and northeast of the treatment system, and up a hill. (The complex terrain and simple terrain inputs model this geography.) Results: • The maximum concentration (6,065 ug/m3) occurred at a distance of 29 meters from the stack. • The maximum concentration at the nearest school (853 ug/m3) occurred at a distance of 134 meters from the stack. .?^*"**\ r'UT MODVIT.DOC (EKI 940053.00) VITELCO PROPERTY LOCATION AIR MODELING /""*"""" Model No. 2, "tutufIt2": Assumptions: • The treatment system is located on flat terrain (approximate elevation 180 feet) • Stack height = 4.9 meters above ground surface Stack diameter = 0.09 meters Stack velocity = 12.7 meters/second • Air dispersion is toward the north, west, and south of the treatment system, down a hill or across flat terrain. (The flat terrain input models this geography.) Results: • The maximum concentration (4,660 ug/m3) occurred at a distance of 29 meters from the stack. f*""*" General Assumptions: • Downwash from Mike's Paints is included in all model runs. • Background concentrations are not included in any of the model runs. MODVIT.DOC (EKI 940053.001 12,352 .a.. 4-12-95 12:01=48 p» V I T £ L C O PROPERTY MODEL TUT OOS O439 ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALINOWSKI • ltu5 COMPLEX TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HT (M) STACK DIAMETER (M) STACK VELOCITY (M/S) STACK GAS TEMP (K) AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION POINT 1.00000 4.8766 .0914 12.6994 296.1500 294.2600 .0000 URBAN 04/12/95 12:01:46 UOY. FLUX ,002 M**4/S**3; MOM. FLUX .335 M**4/S**2. TNAL STABLE PLUME HEIGHT (M) DISTANCE TO FINAL RISE (M) 7.5 200.6 *VALLEY 24-HR CALCS* TERR HT (M) 5. 6. 6. 7. 7. 8. 9. 6. 9. 10. DIST (M) 53. 57. 61. 82. 102. 116. 126. 134. 139. 143. MAX 24-HR CONC (UG/M**3 ) 3909. 3511. 3164. 108.7 110.4 103.6 97.49 852.6. 88 .86^. 82.81 \ CONC (UG/M**3) 46.86 60.93 73.78 108.7 110.4 103.6 97.49 91.87 38.36 82.81 PLUME HT ABOVE STK BASE (M) 6.3 6.3 6.3 6.3 6.5 6.7 6.8 6.9 6.9 7.0 **SIMPLE CONC (UG/M**3) 3909. 3511. 3164. .0000 .0000 .0000 .0000 852.6 .0000 .0000 PLUME HT ABOVE STK U10M USTK HGT (M) SC (M/S) tutuS SIMPLE TERRAIN INPUTS: SOURCE TYPE = EMISSION RATE (G/S) STACK HEIGHT (M) STK INSIDE DIAM (M) "•""'••STK EXIT VELOCITY (M/S) = STK GAS EXIT TEMP (K) - AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION =• POINT 1.00000 4.8766 .0914 12.6994 296.1500 294.2600 1.5000 URBAN 3.2 3.2 3.2 .0 .0 .0 .0 3.2 .0 .0 6 1.0 1.0 6 1.0 1.0 6 1.0 1.0 0 .0 .0 0 .0 .0 0 .0 .0 0 .0 .0 6 1.0 1.0 o .0 .0 0 .0 -0 04/12/95 12:01:46 TUT COS O440 Path: C:\BREEZE\TUTU File: TUTUS .LST 12,352 .a.. 4-12-95 12:01:48 pm BUILDING HEIGHT (M) = 9.1435 f—TN HORIZ BLDG DIM (M) = 1 2 . 1 9 1 4 AX HORIZ BLDG DIM (M) - 18.2870 t»oOY. FLUX = .002 M**4/S**3; MOM. FLUX = .335 M**4/S**2. * >* FULL METEOROLOGY *** ********************************* ' <* SCREEN DISCRETE DISTANCES *** *< f******************************* *••** TERRAIN HEIGHT OF 1. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC • U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASK 4. .0000 0 .0 .0 .0 .00 .00 .00 NA ******************************** ** SCREEN DISCRETE DISTANCES *** ********************************* ** TERRAIN HEIGHT OF 1. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** /TST CONC U10M USTK MIX HT PLUME SIGMA SIGMA ,.M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 11. .0000 0 .0 .0 .0 .00 .00 .00 NA ******************************** *** SCREEN DISCRETE DISTANCES *** * ******************************** *** TERRAIN HEIGHT OF 2. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 1 5 . .0000 - 0 . 0 . 0 . 0 . 0 0 . 0 0 . 0 0 N A ********************************* >** SCREEN DISCRETE DISTANCES *** t******************************** *** TERRAIN HEIGHT OF 2. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH /""""^ 16. .0000 0 .0 .0 .0 .00 .00 .00 NA ********************************* *** SCREEN DISCRETE DISTANCES *** ********************************* TUT 003 O441 Path: C:\BREEZE\TUTU File: TUTUS .LST 12,352 .a.. 4-12-95 12:01:48 pm • TERRAIN HEIGHT OF 3. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT. (M) Y (M) Z (M) DWA 19. .0000 0 .0 .0 .0 .00 .00 .00 NA ******************************** *** SCREEN DISCRETE DISTANCES *** *-******************************** *** TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWA 24. .0000 0 .0 .0 .0 .00 .00 .00 NA ********************************* ** SCREEN DISCRETE DISTANCES *** ******************************** *** TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA / — \(M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DW 25. .0000 0 .0 .0 .0 .00 .00 .00 NA t******************************** »** SCREEN DISCRETE DISTANCES *** ********************************* *** TERRAIN HEIGHT OF 4. M ABOVE STACK BAST* rre-=;D FOR FOLLOWING DISTANCES *** DIST CONC Ul . ^ >.£, PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/; UN'S1'1 T (M) Y (M) Z (M) DWASH ^ ? « i v - - —______ _____—— ————— 27. .0000 0 4 .00 .00 .00 NA ****************************** * *** SCREEN DISCRETE DISTANCES * ******************************* *** TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES ** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWA 29. 6065. 3 1.0 1.0 320.0 .86 7.79 6.50 SS ******************************* *** SCREEN DISCRETE DISTANCES *** ********************************* TUT 008 0442 Path: C:\BREEZE\TUTU File: TUTUS .LST 12,352 .a.. 4-12-95 12:01:43 pm * *** TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** 3T CONC U10M USTK MIX HT PLUME SIGMA SIGMA (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWAS 32. 5792. 3 1.0 1.0 320.0 .66 7.98 6.69 SS * ******************************* * * SCREEN DISCRETE DISTANCES. *** ********************************* * * TERRAIN HEIGHT OF 4. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 34. 5561. 3 1.0 1.0 320.0 .46 8.14 6.85 SS * ******************************* *** SCREEN DISCRETE DISTANCES *** i ********************************* *** TERRAIN HEIGHT OF 5. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 37. 5310. 4 1.0 1.0 320.0 .25 8 . 3 3 7.03 SS ********************************* "* SCREEN DISCRETE DISTANCES *** ******************************** *•** TERRAIN HEIGHT OF 5. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** DIST CONC U10M USTK MIX HT PLUME SIGMA SIGMA (M) (UG/M**3) STAB (M/S) (M/S) (M) HT (M) Y (M) Z (M) DWASH 42. 4871. 4 1.0 1.0 320.0 .05 8.67 7.38 SS DWASH= MEANS NO- CALC MADE (CONC = 0.0) DWASH=NO MEANS NO BUILDING DOWNWASH USED DWASH=HS MEANS HUBER-SNYDER DOWNWASH USED DWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED DWASH-NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB ******************************************** * SUMMARY OF TERRAIN HEIGHTS ENTERED FOR * * SIMPLE ELEVATED TERRAIN PROCEDURE * ******************************************** X«~N TERRAIN DISTANCE RANGE (M) HT (M) MINIMUM MAXIMUM 1. 4. 1. 11. TUT COS 0443 Path: C:\BREE2E\TUTU File: TUTUS .LST 12,352 .a. 2. 15. 2 . 16 . 3 . 19 . 4. 24. 4. 25. 4. 27. 4. 29. 4. 32. 4. 34. 5. 37. 5. 42. ** CAVITY CALCULATION - 1 *** CONC (UG/M**3) = 3987. GRIT WS §10M (M/S) - 1.00 OUT WS 6 HS (M/S) = 1.00 DILUTION WS (M/S) * 1.00 CAVITY HT (M) - 11.73 CAVITY LENGTH (M) =» 19.85 ALONGWIND DIM (M) = 12.19 4-12-95 12:01:48 pm *** CAVITY CALCULATION CONC (UG/M**3) CRIT WS 810M (M/S) - GRIT WS § HS (M/S) - DILUTION WS (M/S) = CAVITY HT (M) CAVITY LENGTH (M) - ALONGWIND DIM (M) = 2 *** 5981. 1.00 1.00 1.00 10.23 10.17 18.29 *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** CALCULATION /^OCEDURE i MPLE TERRAIN riMPLEX TERRAIN BUILDING CAVITY-1 FTJILDING CAVITY-2 MAX CONC (UG/M**3) 6065. 3909. 3987. 5981. DIST TO TERRAIN MAX (M) HT (M) 29. 4. 53. 5. 20. 10. 5. (24-HR CONC) DIST = CAVITY LENGTH) — (DIST = CAVITY LENGTH) *************************************************** fc REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** ************************************************** JN ENDED ON 04/12/95 AT 12:01:48 0444 Path: C:\BREEZE\TDTU File: TUTUFLT2.LST 5,571 .a.. 4-13-95 1:08:36 pm \7ITELCO fROPERTY DISPERSION MODEL NO. 2- ****** SCREEN2 MODEL ****** **** VERSION DATED 92245 **** IBM-PC VERSION (1.01) (C) COPYRIGHT 1993, TRINITY CONSULTANTS, INC. SERIAL NUMBER 6759 SOLD TO ERLER & KALTNOWSKI 04/13/95 13:08:33 1 ituf It2 SIMPLE TERRAIN INPUTS: SOURCE TYPE EMISSION RATE (G/S) STACK HEIGHT (M) , STK INSIDE DIAM (M) STK EXIT VELOCITY (M/S) STK GAS EXIT TEMP (K) AMBIENT AIR TEMP (K) RECEPTOR HEIGHT (M) URBAN/RURAL OPTION BUILDING HEIGHT (M) MIN HORIZ BLDG DIM (M) MAX HORIZ BLDG DIM (M) POINT 1.00000 4.3766 .0914 12.6994 296.1500 294.2610 1.5000 URBAN 9.1435 12.1914 18.2870 JOY. FLUX = .002 M**4/S**3; MOM. FLUX •f^^ FULL METEOROLOGY *** ******************************** *** SCREEN DISCRETE DISTANCES *** ******************************** .335 M**4/S**2. *** TERRAIN HEIGHT OF 0. M ABOVE STACK BASE USED FOR FOLLOWING DISTANCES *** SIGMA Z (M) DWASH DIST (M) 2. 3. 5. 6. 8. 9. 11. 12. 14. 15. 18. 21. 24. _ 27. 29. 30. 33 . 36. 38. CONC (UG/M**3) .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 .0000 4660. 4568. 4420. 4277. 4139. STAB 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 3 4 4 U10M (M/S) .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 1.0 1.0 1.0 1.0 1.0 USTK (M/S) .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 1.0 1.0 1.0 1.0 1.0 MIX HT (M) .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 .0 320.0 320.0 320.0 320.0 320.0 PLUME HT (M) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 4.93 4.93 4.93 4.93 4.93 SIGMA Y (M) .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 7.79 7.90 8.07 8.24 8.41 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 .00 6.50 6.60 6.77 6.95 7.12 NA NA NA NA NA NA NA NA NA NA NA NA NA NA SS ss SS ss ss Path: C:\BREEZE\TUTU File: TUTUFLT2.LST 46. 51. 69. 76. 34. 91. 99. 107. 114. 122. 3757 3417 3117 2351 2615 2405 2123 1924 1752 1603 1473 5,571 .a.. 4-13-95 1:08:36 pm 320.0 320.0 320.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 10000.0 4 4 4 5 5 5 5 5 5 5 5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1..0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 4.93 4.93 4.93 4.93 4.93 4.93 4.93 4.93 4.93 4.93 4.93 8.92 9.43 9.94 10.45 10.96 11.47 12.26 13.06 13.36 14.66 15.45 7.63 3.14 3.65 9.16 9.67 10.18 10.97 11.47 11.96 12.45 12.93 SS SS SS SS SS SS SS SS SS SS SS UWASH= MEANS NO CALC MADE (CONC = 0.0) DWASH=NO MEANS NO BUILDING DOWNWASH USED )WASH=HS MEANS HUBER-SNYDER DOWNWASH USED JWASH=SS MEANS SCHULMAN-SCIRE DOWNWASH USED DWASH=NA MEANS DOWNWASH NOT APPLICABLE, X<3*LB "** CAVITY CALCULATION - 1 *** CONC (UG/M**3) = 3987. CRIT WS @10M (M/S) - 1.00 CRIT WS @ HS (M/S) - 1.00 DILUTION WS (M/S) = 1.00 CAVITY HT (M) - 11.73 CAVITY LENGTH (M) = 19.85 ALONGWIND DIM (M) = 12.19 *** CAVITY CALCULATION CONC (UG/M**3) CRIT WS @10M (M/S) - CRIT WS @ HS (M/S) - DILUTION WS (M/S) - CAVITY HT (M) CAVITY LENGTH (M) = ALONGWIND DIM (M) = 2 *** 5981. 1. 1, 1, ,00 ,00 ,00 10.23 10.17 18.29 *************************************** *** SUMMARY OF SCREEN MODEL RESULTS *** *************************************** CALCULATION PROCEDURE IMPLE TERRAIN BUILDING CAVITY-1 UILDING CAVITY-2 MAX CONC (UG/M**3) 4660. 3987. 5981. DIST TO •] MAX (M) 29. 20. 10. [TERRAIN HT (M) 0. — (DIST — (DIST CAVITY LENGTH) CAVITY LENGTH) **************************************************** ** REMEMBER TO INCLUDE BACKGROUND CONCENTRATIONS ** *************************************************** ENDED ON 04/13/95 AT 13:08:36 TUT OOS 0447 SPECIFICATION 13720 - AIR STRIPPER TUT OO8 0448 Sub Section C-3 (EKI 940058.03) SECTION 13720 - AIR STRIPPER PART 1 —— GENERAL _/-N 1.1 The Requirement A. General: The EQUIPMENT SUPPLIER shall furnish two skid- mounted low-profile air strippers suitable for automatic operation, together with all necessary blowers, piping, valves, fittings, controls, gauges, supports, and appurtenances to provide two complete and workable systems as specified herein. The EQUIPMENT SUPPLIER shall furnish (1) an air stripper without a blower for the Texaco Service Station location ("Location No. 1") that will be connected with an OWNER furnished catalytic oxidizer and other system equipment, and (2) an air stripper with a blower for the Vitelco Property location ("Location No. 2") site that will be connected with other system equipment. The air strippers furnished by EQUIPMENT SUPPLIER will become part of two separate treatment plants. The treatment plants will be assembled within separate shipping containers at the facility of the CONTRACTOR at Campbell, CA and delivered to each location in St. Thomas, U.S. Virgin Islands for installation. 1.2 EQUIPMENT SUPPLIER Submittals f—v A. Shop Drawings: Furnish four copies of shop drawings for the air strippers. One copy shall be returned following review by ENGINEER. At a minimum provide descriptive information and drawings showing the system footprint, layout of the air stripper, water inlet and outlet, blower, baffled trays, and air outlet. 1. Descriptive information and drawings including but not limited to: a. Removal efficiencies. b. Materials of construction. c. System safety shutdowns. d. A process and instrumentation diagram. e. Operating characteristics of blower. f. Utilities needed for operation of the unit. g. Footprint and height of the unit. h. Locations of piping inlets and outlets. i. Delivery conditions and warranties. 2. Electrical and instrumentation information as follows: a. Materials list and catalog cuts for instruments and electrical components. b. Control panel elementary diagram. -^ c. System interconnection diagram showing conduit sizes, wire gage and count. 13720-1 (EKI 940058.00) TUT d. Motor data sheets for air blower to include manufacturer, full load amps, power factor, efficiency, horsepower, voltage, service factor, /***N insulation class, and temperature rating. e. Interior and exterior control panel layouts showing component locations and nameplate inscriptions. f. Calculated weights and actual shipping. 3. Seismic Calculations: Seismic calculations for the complete skid-mounted unit shall be verified and stamped by a registered Civil or Structural Engineer, to demonstrate conf ormance with the seismic requirements of the Uniform Building Code, 1994 edition. 4. Manuals: Furnish three copies each of manufacturer's installation, operation and maintenance manuals, bulletins, lubrication instructions, and spare parts lists. 5. Submittal Dates: Within 1 week of receipt of letter of intent to purchase equipment, provide all of the shop drawings for each unit. Provide manuals at time of shipment of units to Campbell, CA. B. Connections: EQUIPMENT SUPPLIER shall use dimensional drawings to scale clearly communicating the exact location, orientation, elevation, size, and type of all field connections required, including but not limited to the s~*^ following: 1. Process piping. 2. Anchor bolts. 3. Electrical power. 4. Instrumentation and controls. Part 2 — PRODUCTS 2.1 General Information and Performance Requirements A. Groundwater from extraction wells shall be treated to remove organic compounds. The flow-rate, water temperature, ambient air temperature, and anticipated influent organic compound concentrations for each location are listed below. The air stripper shall remove the organic compounds to levels at or below the listed discharge limits (Federal Maximum Contaminant Limits). minimum water temperature 65°F maximum flow-rate: Location No. 1 55 gallons/minute *""" N Location No. 2 20 gallons/minute 13720-2 (EKl 940058.00) Location Ho. 1 Location Ho. 2 Influent Influent Discharge Concentrations Concentrations (W/L) Benzene 17,000 30 5 Toluene 15,000 10 1,000 Sthylbenzene 3,000 10 700 Xylene 13,000 10 10,000 Naphthalene 500 10 NA Methyl tart butyl 46,000 500 NA ether (MTBE) 1,2-Oichloroethane 300 10 5 (DCA) 1,2-Dichloroethene 500 400 70 (DCS) Tetrachloroethene 50 200 5 (PCS) Trichloroathene (TCE) 50 40 5 Vinyl Chloride 100 10 2 Mathylene Chloride 4,000 10 5 Acetone 1,000 10 NA 2.2 Design and Construction A. Corrosion Protection: Due to proximity of the ocean and the warm and humid climate, conditions at both locations are extremely favorable for corrosion of exposed parts. Whenever possible, external parts and controls shall be constructed with corrosion resistant materials. Electrical enclosures shall be constructed of plastic. B. Reactors: The air stripper reactors shall be constructed of a corrosion resistant material. The air strippers shall provide sufficient air to water contact to reduce the levels of organic compounds in water to those listed in Section 2.1. C. Blower Systems: Air flow through the low profile air stripper at Location No. 1 will be induced by a vacuum blower provided with the OWNER furnished catalytic oxidizer. The supplied vacuum blower will create a maximum vacuum of 25 inches of water. Therefore, 25 inches of water shall induce a sufficient air flow through the low profile air stripper to reduce the levels of organic compounds in water at location No. 1 to those listed in Section 2.1. A blower provided by the EQUIPMENT SUPPLIER shall induce air flow through the low profile air stripper at Location No. 2. The blower system for Location No. 2 shall consist of the following characteristics and components. 1. The blower shall provide sufficient air flow to reduce the levels of organic compounds in water to those listed in Section 2.1. 2. The blower shall operate on three phase 230 volt power. 13720-3 (EKI 940058.00) n.JT OO8 0451 E. System Requirements and Appurtenances: The two air stripping systems shall include the following: /•—\ X. Location No. 1 a. Sump Tank b. Stripper Trays c. Air pressure Gauge d. Mist Eliminator e. Piping f. Spray Nozzle g. Water Level Sight Tube h. Gaskets i. Latches j. Frame k. Explosion-Proof Motors 1. NEMA 3R - Remote Mounted Control Panel m. Main Disconnect Switch n. Intermittent Operation o. Power Loss Indicator p. Low Air Pressure Alarm Switch q. High Water Level Alarm Switch r. Water Pressure Gage s. Digital Water Flow Indicator t. Air Flow Meter u. Temperature Gauge v. Line Sampling Ports w. Washer Wand 2. Location No. 2 a. Sump Tank b. Stripper Trays c. Blower d. Air pressure Gauge e. Mist Eliminator f. Piping g. Spray Nozzle h. Water Level Sight Tube i. Gaskets j. Latches k. Frame 1. Discharge Pump m. Explosion-Proof Motors n. NEMA 3R Control Panel - Remote Mounted o. Main Disconnect Switch p. Intermittent Operation q. Power Loss Indicator r. Low Air Pressure Alarm Switch s. High Water Level Alarm Switch t. Discharge Pump Level Switch u. Water Pressure Gauge v. Digital Water Flow Indicator w. Air Flow Meter x. Temperature Gauge 13720-4 (EKX 940058.00) y. Line Sampling Ports z. Air Blower Silencer aa. Washer Wand E. Safety Shut-Down Controls: Shutdowns shall include: 1. Low air pressure. 2. High water level. 3. Power loss to unit. Any safety shutdown shall initiate an alarm and send the signal to the main system control panel. F. Normal System Start-up and Shut-down Operations: Provide adjustable 5-minute time delays on all normal start-up and shut-down operations. 6. System Testing: The EQUIPMENT SUPPLIER shall test the air stripper at their facility to ensure that all equipment functions properly. H. Manufacturer's Service Representative: 1. Shop Testing: Once the air strippers are installed in containers and the rest of the treatment plant has been assembled, the complete system will be tested at the shop where the treatment plant has been assembled. At the option of the OWNER, a factory trained service technician shall be supplied for one day to provide assistance for this shop test. The shop test will be conducted in Campbell, California. 2. Start-Up Assistance: A factory trained service technician shall be supplied for five days to startup and balance the air stripper system at the site in St. Thomas, U.S. Virgin Islands. 3. Instruction of OWNER'S Personnel: The EQUIPMENT SUPPLIER shall provide for the services of a factory service representative for one day to instruct the OWNER'S personnel in the operation and maintenance of the equipment. This shall be included with the five day startup service above. I. Yield Procedures: Instructions for field procedures for erection, adjustments, inspection, and testing shall be provided prior to installation of each piece of equipment. 2.3 Guarantees, Warranties A. A 2-year warranty shall be provided for the air stripping units and their components. It shall warrant the unit from the first date of operation (1) to be free of any defects in 13720-5 IEKI 940058.00) 'TUT 008 04 materials and/or workmanship, and (2) to satisfy air stripper performance criteria included in these specifications. --*"-• 2.4 .Manufacturers, or Equal A. North East: Environmental Products, Inc., West Lebanon, New Hampshire, Shallow Tray Model 3641 (Location No. l) and Shallow Tray Model 1341 (Location No. 2). PART 3 — EXECUTION 3.1 Delivery A. Deliver the skid-mounted air stripper to Campbell, California within 7 weeks of receipt of purchase order of__ equipment (assume shop drawings will be reviewed by ENGINEER within 5 days). 13720—6 (EKX 940038.00) TUT' COS O454 SCO Erler & Kalinowski, Inc. C-4. Performance Monitoring A regular monitoring program will be implemented to evaluate the performance of the groundwater remediation system. The purpose of the program is to evaluate: • hydraulic capture, • potential hydraulic impacts to nearby properties, • the concentration of chemicals of concern in groundwater over time, and • the concentration of chemicals of concern in air The monitoring program will consist of: • quarterly measurement of groundwater levels in selected wells to evaluate groundwater capture, • quarterly collection and analysis (by ERA Method 8240) of groundwater samples from selected wells to monitor changes in concentrations of chemicals of concern, and • monthly collection and analysis (by EPA Method 8240) of influent vapor and treated vapor samples from the catalytic oxidizer to monitor compliance with air permit requirements. • monthly collection and analysis of treated groundwater samples in accordance with the TPDES application, currently under review. Proposed monitoring parameters and monitoring frequency for the start-up and shakedown period, i.e. the first six months of system operation, are discussed below. All air samples will be analyzed by EPA Method 8015/8020 (modified) for petroleum hydrocarbons, BTEX, and MTBE and by EPA Method 8010 for chlorinated VOCs. The long term monitoring plan will be developed during the start-up and shakedown period and will be submitted to regulatory agencies following the first six months of operation. C-4.1 Groundwater Monitoring The wells to be included in the monitoring program are summarized in Table C- 4.1 . They include most of the existing wells in the vicinity of the Service Station and Vitelco Sites. Collection of groundwater levels in the selected wells will i/*"**N allow evaluation of regional hydraulic effects. Analysis of groundwater samples from the selected wells will provide ongoing characterization of groundwater F'UT OOR C-4.1 Section C (EKI 940058.03) Erier & Kalinowski, Inc. upgradient of the Service Station Site, at the Service Station Site, at the Vitelco Site, and downgradient of both sites. In the event that Tutu Environmental Investigation Committee ("TEIC") or other parties monitor groundwater wells in the valley, Texaco proposes to utilize data generated from such efforts to supplement or replace elements of the Texaco monitoring program. C-4.2 Influent and Treated Vapor Monitoring at the Service Station Site At system start-up, soil vapor at each SVE wellhead, exhaust gas from the groundwater air stripper (discussed in Section B), and the combined catalytic oxidizer influent and effluent vapor streams will be sampled. The soil vapor samples will be collected in "Summa" vacuum canisters or Tedlar bags and analyzed for petroleum hydrocarbons, BTEX, and MTBE by ERA Method 8015/8020 (modified) and for chlorinated VOCs by ERA Method 8010. This initial sampling will determine initial SVE well vapor-phase concentrations and confirm that the catalytic oxidizer meets specified destruction efficiencies. Following system start-up, monthly sampling at the same locations will be performed with a RID for the first six months of system operation. Data generated during monthly sampling will be used to monitor the effectiveness of the SVE system and catalytic oxidizer. C-4.3 Air Stripper Air Emissions at the Vitelco Site Off-gas vapor from the groundwater air stripper will be released directly to the atmosphere as discussed in Section C-3. At system start-up, an air sample will be collected at the exhaust stack and analyzed to determine initial concentrations of chemicals of concern. On a monthly basis, an air sample from the same sample port will be taken and analyzed to monitor air emissions for compliance with the DPNR issued air permit. <'•••> t OO3 0457 C-4.2 Section C (EK1 940058.03) TABLE C-4.1 WELLS INCLUDED IN GROUNDWATER SYSTEM QUARTERLY MONITORING PROGRAM Texaco Tutu, U.S. Virgin Islands (EKI 940058.03) Ground water Level Measurement Shallow Wells MW-16, MW-17, MW-15, MW-1, MW-2, TT-2, MW-3, MW-4, TT-4, TT-5, TT-1, MW-5, MW-6R, TT-6, MW-7, CHT-4, CHT-1 Deep Wells MW-1 D.'TT-SD, MW-4D, TT-1D, CHT-6D, MW-6D, Tillett, Four Winds III, Four Winds II, Four Winds I Quarterly Groundwater Sampling Up-Gradient Wells MW-16, MW-15, MW-1, MW-1D On-Site Wells TT-2. TT-3D, MW-3, MW-4, MW-4D, TT-5, TT-1, TT-1 D Down-Gradient Wells MW-5, Tillett, MW-7 Note: TT-1 and TT-1D may be sacrificed for installation of groundwater extraction wells TEW-1 and TEW-1 D given the severiy limited access at the Texaco Service Station Site. TABLES.XLS TUT f- Erler & Kalinowski, Inc. C-5. System Operation C-5.1 Expected Operations Schedule The groundwater extraction system, together with the SVE system at the Service Station Site, will operate on a 24-hour basis. The groundwater extraction system at the Vitelco Site will also operate on a 24-hour basis. Based on experience with similar types of remediation systems, system up-time at both locations is expected to be in the range of 90%-95%, or from 328 to 347 days per year. It is expected that operational difficulties will most likely be experienced at the beginning of system operation. As the system is adjusted, increased up-time is anticipated. C-5.2 Instrumentation and Control The groundwater extraction system, together with the SVE system, will be automatically controlled. The Vitelco Site system will also be automatically controlled. Each location will be controlled separately. Each system is designed with shutdowns and interlocks to prevent the operation of the groundwater pumps if the air stripper is not operating within specified parameters or if the groundwater pumps are not operating properly. Similarly there are internal controls on the catalytic oxidizer at the Texaco site to shut down if it is not operating within specified parameters. In the case of a system shutdown at either location, an auto-dialer will signal the shutdown to O&M personnel. It is anticipated that the O&M personnel will respond to the signal within a few hours. Control descriptions and equipment lists for the Texaco Site and the Vitelco Sites are given on Table C-5.1. During the final design a complete Process and Instrumentation Diagram (P&ID) will be prepared that will show the complete instrumentation of the groundwater extraction system. C-5.1 Section C (EK1 940058.03) TABLE C-5.1 TEXACO TUTU SERVICE STATION CONTROL DESCRIPTION & EQUIPMENT LIST Texaco Tutu, U.S. Virgin Islands (EKI 940058.05) EQUIPMENT ELECTRICAL GROUNDWATER PUMPS (To be supplied by Contractor) CHEMICAL FEED SYSTEM (To be supplied by Contractor) AIR STRIPPER (Owner furnished) POWER REQMTS 230V 1 Phase 60 Hz 230V 1 Phase 60 Hz 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Remote panel Power loss at panel => Air Flow Meter Temperature gauges Air Blower Silencer Line Sample Ports Low Air Pressure Alarm => (w/adjustable time delay) High Water level Alarm => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BY CONTR (3) Current sensor type <= protection device Power loss at <= chemical feed pump FIRST OUT PANEL (4) YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES 4s. QTAPRDP. XI S (EKI 940058.03) TABLE C-5.1 TEXACO TUTU SERVICE STATION CONTROL DESCRIPTION & EQUIPMENT LIST Texaco Tutu, U.S. Virgin Islands (EKI 940058.05) EQUIPMENT CATALYTIC OXIDIZER (Owner furnished) POWER REQMTS 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Low air flow => High catalyst exit => temperature Liquid Level Switch if high => liquid in V/L separator High temperature in sound => enclosure Power loss at panel => High or low gas pressure => Flame failure => Spark arrester => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BY CONTR (3) FIRST OUT PANEL (4) YES YES YES YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES YES YES YES NOTES: 1. These are the control options that are included by the manufacturer with the equipment. If any one of these alarm conditions occurs, a signal will be sent from that piece of equipment that an alarm condition has been detected. 2. This indicates what should occur if the indicated alarm condition is detected. 3. These are the control options that shall be designed and installed by the CONTRACTOR. 4. A Yes indicates that if the indicated alarm condition is detected, it should be indicated on a First Out Panel. 5. A Yes indicates that if the alarm condition is detected, it should activate the autodialer. STAPROC.XLS (EKI 940058.03) TABLE C-5.1 VITELCO PROPERTY CONTROL DESCRIPTION & EQUIPMENT LIST Texaco Tutu, U.S. Virgin Islands (EKI 940058.05) EQUIPMENT ELECTRICAL GROUNDWATER PUMPS (To be supplied by Contractor) CHEMICAL FEED SYSTEM (To be supplied by Contractor) AIR STRIPPER (Owner furnished) POWER REQMTS 230V 1 Phase 60 Hz 230V 1 Phase 60 Hz 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Remote panel Power loss at panel => Air Flow Meter Temperature gauges Air Blower Silencer Line Sample Ports Low Air Pressure Alarm => (w/adjustable time delay) High Water level Alarm => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BY CONTR (3) Current sensor type <= protection device Power loss at <= chemical feed pump FIRST OUT PANEL (4) YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES NOTES: 1. These are the control options that are included by the manufacturer with the equipment. If any one of these alarm conditions occurs, a signal will be sent from that piece of equipment that an alarm condition has been detected. 2. This indicates what should occur if the indicated alarm condition is detected. 3. These are the control options that shall be designed and installed by the CONTRACTOR. 4. A Yes indicates that if the indicated alarm condition is detected, it should be indicated on a First Out Panel. 5. A Yes indicates that if the alarm condition is detected, it should activate the autodialer. (EKI 940058.03) TUT COS O464 Erler & Kalinowski, Inc. <**>«*N ' C-6. Contingencies Assumptions used in the design of the groundwater system may be revised based on observed field conditions. Possible contingency plans are summarized below. C-6.1 Achievement of Hydraulic Capture Extraction rates will be adjusted within the design range of the treatment system (20 to 50 gpm) to achieve groundwater capture. If groundwater capture is not achievable within this range, modifications to the groundwater remediation system will be evaluated. These modifications could include the construction of additional extraction wells as well as additional treatment capacity (e.g., an additional air stripper and catalytic oxidizer). C-6.2 Achievement of Remedial Goals Federal MCLs have been established as the remedial goal for operation of the groundwater system. If upgradient groundwater quality makes these goals unachievable, however, modified goals may be established. Modified remedial goals would be based on reducing concentrations of chemicals of concern in *~^ onsite and downgradient monitoring wells to levels found in upgradient monitoring wells. C-6.3 Limiting Perturbation of Suspected DNAPL Near the Curriculum Center Preliminary groundwater modeling indicates that groundwater pumping at the Texaco property may result in a drawdown of approximately 3 to 5 feet near the Curriculum Center where DNAPL may be present. It is possible that excessive drawdown near the Curriculum Center could mobilize DNAPL if present. If excessive drawdown is detected during performance monitoring, extraction rates from the existing wells will be decreased. Installation of additional extraction wells needed to maintain hydraulic capture will be evaluated. Should LNAPL need to be recovered, a selective oil skimmer will be installed in the well. A selective oil skimmer is designed to skim LNAPL from the surface of the groundwater. An air operated bladder pump, located at the surface, lifts the LNAPL from the skimmer and discharges the LNAPL into a storage tank. "UT O4 6 5 C-6.1 Section C (EKI 940058.03) Erler & Kalinowski, Inc. SECTION D - ADDITIONAL INVESTIGATIONS D-1. Chemical Data for Soil on the Service Station Site As discussed in EKI (1995), there are limited chemical data for soil at the Service Station Site. To augment these data and to assure that the SVE system is remediating the soil impacted by the petroleum hydrocarbons, additional soil samples will be collected and analyzed during installation of the system. Soil samples will be collected at the capillary fringe from the borings for the 2 new SVE wells and both shallow groundwater wells. Any soil samples obtained will be analyzed using ERA Method 8240 for volatile organic compounds and 8015 for petroleum hydrocarbon compounds. D-2. LNAPL Evaluation As described in EKI (1995), provision for LNAPL recovery is part of the design for the groundwater extraction system at the Service Station Site. At the time the remediation system is installed, existing wells TT -1 and TT - 2 will be surveyed to determine if free product is present in either or both wells. In addition, during the installation of the two new SVE wells and the new shallow groundwater extraction well, observations will be made to determine if LNAPL is present. The results of the LNAPL survey will be used as the basis for system modifications, if needed. TUT OO8 O46" D.1 Section D (EKI 940058.03) 89 frO BOO mi ~i WSl sMvr.'.." y * : mm Erler & Kalinowski, Inc. SECTION E - IMPLEMENTATION AND SCHEDULE E-1 Conceptual Design EKI, on behalf of TCl, has prepared a conceptual design for the remediation systems at the Service Station Site and at the Vitelco Site. This design was described in the April Report, in addition, this conceptual design was also included in the request for proposal documents prepared by EKI that were sent to prospective contractors for contract bidding. The technical portions of the request for proposal are included in this section and are listed below. • Technical Specifications: Section 01 010: Summary of Work Section 01901 : Phase I - Design Section 01 902: Phase 2 - Assembly of Treatment Plants Section 01903: Phase 3 - On Site Construction and Start-Up • Alarms & Interlocks (Attachment A of Technical Specifications) • Assumed Water Quality (Attachment A of Technical Specifications) • Existing Monitoring Well Construction Logs - TT-4 and TT-1 (Attachment A of Technical Specifications) • Owner Furnished Equipment, Catalytic Oxidizer and Air Strippers (Attachment B of Technical Specifications) E-1.1 Section E (EKI 940058.03) TUT OOP O4 70 SECTION 01010 SUMMARY OF WORK PART I — GENERAL 1.01 General The WORK to be performed shall consist of the design, construction, and start-up of a groundwater extraction and treatment system and a soil vapor extraction and treatment system at the Texaco Service Station in the Tutu Area of St. Thomas ("Location 1") and the design, construction, and start-up of a groundwater extraction and treatment system at the Vitelco Property ("Location 2") . Location 1 and Location 2 are collectively called the "Site". Both systems shall use certain OWNER furnished major equipment. It is the intent of the Contract Documents that the CONTRACTOR provide complete and fully functional systems conforming to all applicable Laws and Regulations, including all codes and local requirements. The OWNER furnished major equipment will consist of l) air strippers for Locations 1 and 2 and 2) A catalytic oxidizer for Location 1. All other materials, appurtenances, and equipment shall be supplied by CONTRACTOR so as to provide complete and functional systems. Since the Site is in the U.S. Virgin Islands and therefore remote, it is intended that the treatment plants each be assembled in a container at CONTRACTOR'S shop, tested in the shop, and shipped to the Site. It is also intended that the containers become the permanent housing for the treatment plants at the Site. CONTRACTOR shall perform the WORK in three phases generally described as: 1) design, 2) assembly and testing of treatment plants in containers at CONTRACTOR'S shop, 3) construction of the well heads, groundwater extraction and vapor extraction conveyance piping, conduits, installation of pumps, and connection of the treatment plants at both locations on the Site, and startup and testing of both the systems. Each of the three phases is described in more detail in the following Sections 01901, 01902, 01903 and the remainder of the Contract Documents. 1.02 General System Description A plan view showing the two locations on the Site is included in the Drawings. Plan views and schematics of the systems are also shown on the Drawings. Included in Attachment A is a table in which is summarized the alarms and interlocks for each system, the assumed water quality and flowrates, and existing monitoring well construction logs. Included in Attachment B are catalog cuts of 5/11/95 01010.1 SUMWORK.DOC the air strippers and the catalytic oxidizer or similar units that are being furnished by the OWNER. Presented below is a general description of each of the systems: Location 1. At Location 1 there are planned to be four groundwater extraction wells and three soil vapor extraction wells. Pumps furnished by the CONTRACTOR shall be installed in each of the groundwater extraction wells. The anticipated groundwater extraction rate is 8 to 15 gallons per minute ("gpm") per well. The anticipated influent concentration of the chemicals of concern and inorganic water quality parameters are included in Attachment A. The extracted groundwater will be treated by an air stripper furnished by the OWNER and installed by CONTRACTOR. The treated groundwater will be discharged into an existing storm drain catch basin at the location shown on the Drawings via a pipeline constructed by CONTRACTOR. The air stripper will have a hydraulic capacity of 50 gpm and an air flow rate of 900 standard cubic feet per minute ("scfm"). The air flow from the discharge of the air stripper will be treated by a catalytic oxidizer furnished by the OWNER and installed by CONTRACTOR. The catalytic oxidizer will have an air flow capacity of 1,000 scfm. The air flow through the air stripper will be created by one of two blowers that will be furnished by the OWNER with the catalytic oxidizer. The blower will create a vacuum of approximately 18 inches of water at the air stripper. The soil vapor extraction ("SVE") system will consist of three extraction wells. The vacuum at each of the SVE wells will be induced by the second blower furnished with the catalytic oxidizer. The second blower will be capable of creating a vacuum of six inches of mercury at an air flow rate of 100 scfm. The discharge from this blower will be combined with the air flow from the air stripper and also treated by the catalytic oxidizer before it is discharged to the atmosphere. Location 2. At Location 2 there are planned to be two groundwater extraction wells. Pumps furnished by the CONTRACTOR shall be installed in each well. It is anticipated that the groundwater extraction rate from each well will be between 5 and 10 gpm. The anticipated influent concentration of the chemicals of concern and inorganic water o^iality parameters are included in Attachment A. The extracted groundwater will be treated by an air stripper furnished by the OWNER and installed by CONTRACTOR. The treated extracted groundwater will be discharged into an existing storm drain catch basin at the location shown on the Drawings via a pipeline constructed by the CONTRACTOR. TUT OO8 O472 5/11/95 01010.2 SOMWORK.DOC ^"^ The air stripper will have a hydraulic capacity of 20 gpm and an air flow rate of approximately 150 scfm. The air from the air stripper will be discharged directly to the atmosphere without further treatment via a stack provided by CONTRACTOR. 1.03 General Design Criteria The groundwater extraction and treatment systems and SVE system at both locations shall conform to the following criteria: 1) The treatment plant containers shall be lighted to permit maintenance and easy monitoring of gauges, equipment, and other instruments during night time hours. 2) The treatment plant containers shall be ventilated such that the temperature inside is compatible with the equipment and controls housed in the container, and such that it is reasonably comfortable for a person to work inside of the container. The containers shall be ventilated such that the portion of the container or containers that house equipment and or piping containing untreated water or air will be classified as a Class I Division 2 space and the portion that will house the electrical enclosures will be unclassified /**"*•*. 3) The materials of construction of CONTRACTOR furnished equipment, piping, wire, and conduit shall be appropriate for the hot, humid, salt air environment at the Site. 4) The treatment plants shall be suitably designed to withstand code-specified wind and seismic events. 5) The treatment plants and other appurtenances shall be secure, but easily accessible, especially critical components of the treatment plants, for operation and maintenance activities. 6) Spare parts for CONTRACTOR furnished equipment and materials shall be readily available. END OF SECTION TUT OOa 0477 5/11/95 01010.3 SOMWORK.DOC SECTION 01901 PHASE 1 - DESIGN PART I — GENERAL 1.01 General CONTRACTOR shall develop the Assembly Drawings. The Assembly Drawings shall be based on the information contained herein and as necessary for complete and functional systems. 1.02 Schedule CONTRACTOR shall prepare and submit to ENGINEER a preliminary schedule for the performance of the WORK within 14 days from the Notice to Proceed. This schedule shall be based on the schedule included in Attachment C ("Schedule"). CONTRACTOR'S schedule shall show the completion date to be on or before the completion date shown on the Schedule. CONTRACTOR shall make every effort to comply with the schedule. If the ENGINEER or OWNER is unable to substantially complete a task assigned to either of them in the time allocated on the Schedule, it will be considered a changed condition and the CONTRACTOR'S time to perform the WORK will be extended in accordance with the General Conditions and Supplementary General Conditions. No additional compensation to CONTRACTOR will be made for such changed condition beyond such time extension. 1.03 Design Meeting CONTRACTOR shall schedule qualified employees to attend a three day Design Meeting at the Site with the OWNER and ENGINEER. The primary goal of the meeting will be to review and confirm field details of: 1) the Process and Instrumentation Diagrams ("P&ID"), 2) the electrical single line and schematic diagrams, 3) the Materials List (list of materials, other than OWNER Supplied Equipment, to be used by CONTRACTOR in the construction of the WORK, 4) the piping layout and conduit runs, 5) miscellaneous electrical, control system, alarm, structural, and mechanical details, 6) permit and property access status, and 7) shop and startup testing and monitoring requirements. In preparation for the Design Meeting, CONTRACTOR shall prepare a preliminary draft of the P&ID, preliminary electrical single line and schematic diagrams, preliminary plan layout drawings for the treatment plant for both Location 1 and Location 2 including preliminary piping layout and conduit run locations, and any details that the CONTRACTOR determines are important to the construction of the WORK. These submittals shall be based on the information included in the Contract Documents and as necessary for a complete and satisfactory installation. TUT OOS 0474 6/8/95 01901.1 PHASE1.DOC Drafts of the above documents shall be submitted to the ENGINEER three working days prior to the Design Meeting. At the Design Meeting, ENGINEER will furnish to the CONTRACTOR the draft shop drawings for the owner furnished equipment and shop testing and start-up testing and monitoring requirements to enable the CONTRACTOR to prepare its bid price for Phase 2 and 3 of the WORK. 1.04 Assembly Drawings On the basis of the information contained in the Contract Documents and developed at the Design Meeting, CONTRACTOR shall prepare the Assembly Drawings. The Assembly Drawings shall include P&ID, electrical single line diagram, electrical schematic diagrams, plan layout drawings for each treatment plant, and a comprehensive Materials List for both Locations 1 and 2. The plan layout drawings shall be prepared in enough detail to clearly show how the equipment will be installed in the containers. The ENGINEER'S review of the Assembly Drawings does not relieve the CONTRACTOR of its responsibility to perform in accordance with the Contract Documents. The Assembly Drawings shall be subject to the provisions of Article 9, Paragraph 9.7, Contractor Submittals, Change Orders, and Payments, and Paragraph 9.9, Limitations on ENGINEER'S Responsibilities. The adequacy of the Assembly Drawings is solely the responsibility of the CONTRACTOR. Errors or omissions in the Assembly Drawings shall be subject to, without limitation, the provisions of Article 13 of the General Conditions, WARRANTY AND GUARANTEE; TESTS AND INSPECTIONS; CORRECTION, REMOVAL, OR ACCEPTANCE OF DEFECTIVE WORK. CONTRACTOR shall submit 'the draft Assembly Drawings to the ENGINEER for review. ENGINEER will furnish comments to CONTRACTOR within five (5) working days of receipt of a clear and complete set of draft Assembly Drawings. CONTRACTOR shall incorporate ENGINEER'S comments on the draft Assembly Drawings in the final Assembly Drawings and submit final Assembly Drawings to ENGINEER within five (5) working days of receipt of ENGINEER'S comments on draft Assembly Drawings. Upon favorable review by the ENGINEER, the final Assembly Drawings shall become the basis for the construction of the treatment plants. The final Assembly Drawings shall become the property of the OWNER. CONTRACTOR may retain copies for its records of the final Assembly Drawings. OWNER, at its option, may use these documents for construction of the WORK by others. 1.05 Site Civil Drawincrs ENGINEER will prepare schematic and plan view drawings for the construction of the piping and conduit from the wells to the 6/8/95 01901.2 PHASE1.DOC ^—v treatment plants and the site grading at both Location 1 and Location 2. These drawings will be prepared based on information developed during the Design Meeting. These drawings will include plans and details. OWNER will construct wells without pumps or surface improvements. ENGINEER will submit a draft of Site Civil Drawings to CONTRACTOR for review. CONTRACTOR shall submit its comments on draft Site Civil Drawings to ENGINEER within three (3) working days of receipt of draft Site Civil Drawings. ENGINEER will consider CONTRACTOR'S comments on draft Site Civil Drawings in the preparation of final Site civil Drawings. ENGINEER will furnish to CONTRACTOR three sets of the final Site Civil Drawings to CONTRACTOR within five (5) working days of receipt of CONTRACTOR'S comments on draft Site Civil drawings. The final Site Civil Drawings shall be the basis for the construction of the extraction and treatment systems at both locations on the Site. 1.06 Phase 2 and Phase 3 Cost Proposal CONTRACTOR shall submit a lump sum cost proposal.for the performance of Phase 2 and Phase 3 of the WORK at the time CONTRACTOR submits the draft Assembly Drawings. The cost proposals shall be based on the draft Assembly Drawings. CONTRACTOR shall provide backup spread sheets demonstrating how f*~*^ the lump sum was developed using the unit costs in CONTRACTOR'S Bid. OWNER and CONTRACTOR will attempt, diligently and in good faith, to reach agreement concerning appropriate compensation. If a satisfactory lump sum cannot be agreed to, OWNER may elect to terminate the Contract in accordance with General Conditions and Supplementary General Conditions Article 14. The lump sum cost proposal shall be itemized to facilitate the determination of monthly progress payments. The itemization shall be grouped by location, treatment plant, and elements of work that are readily measurable. Mobilization costs, insurance costs, and overhead costs shall not be considered an item of cost but shall be prorated over items of work. In the event the cost itemization is not favorably reviewed by ENGINEER, another itemization shall be submitted until the cost itemization is acceptable to CONTRACTOR and ENGINEER. 1.07 Payment Payment for work performed in this section shall be at the unit rates indicated in Bid Items la and Ib. Total payment shall not exceed the budget in CONTRACTOR'S Bid. /—"N END OF SECTION !"UT 008 0476 6/8/95 01901.3 PHASE1.DOC SECTION 01902 PHASE 2 - ASSEMBLY OF TREATMENT PLANTS PART I — GENERAL 1.01 General CONTRACTOR shall assemble a groundwater and soil vapor treatment plant for Location 1 and a groundwater treatment plant for Location 2 on the Site. The treatment plants shall be assembled in a container suitable for both shipping to St. Thomas, U.S. Virgin Islands and as permanent enclosures for the treatment plants once they are installed on the Site. The treatment plants shall be assembled using a combination of OWNER furnished equipment and CONTRACTOR supplied equipment, materials, and labor. The treatment plants shall be assembled as detailed in the favorably reviewed Assembly Drawings. CONTRACTOR shall be responsible for providing complete and satisfactorily functioning systems meeting all applicable Laws and Regulations, including local codes and requirements. 1.02 OWNER Furnished Equipment CONTRACTOR shall provide all equipment and manpower necessary to receive OWNER supplied equipment from the manufacturer. The equipment shall be stored according to manufacturer's instructions. Once the OWNER furnished equipment arrives at the CONTRACTOR'S shop, CONTRACTOR shall be responsible for the equipment. For purposes of this project, the equipment shall be considered as having arrived at CONTRACTOR'S shop once the CONTRACTOR has begun unloading equipment from the transportation vehicle. CONTRACTOR shall inform ENGINEER immediately if equipment is not received in satisfactory condition. The equipment to be furnished by the OWNER to the CONTRACTOR for each location is listed below: Texaco Service Station Vitelco Site (Location 1) (Location 2) 1 - Air Stripper 1 - Air Stripper 1 - Catalytic Oxidizer Included in Attachment B is manufacturer's information for the OWNER furnished equipment. The manufacturer's information furnished is for a typical air stripper and catalytic oxidizer. TUT COS 0477 5/11/95 01902.1 PHASK2.DOC The actual equipment furnished may be different than that included in Attachment B. If OWNER furnished equipment requires modification after delivery to the CONTRACTOR'S shop and the equipment supplier is unable to modify the equipment or it caust^ a schedule delay beyond CONTRACTOR'S reasonable control, it shall be considered a changed condition and CONTRACTOR shall be reimbursed according to Article 11 and the schedule shall be modified according to Article 12 of the General Conditions and Supplementary General Conditions. ENGINEER will arrange with the suppliers of the OWNER furnished equipment to submit to CONTRACTOR shop drawings showing the details of the OWNER furnished equipment. 1.03 Materials and Containers CONTRACTOR shall furnish all the containers within which the treatment plants are installed and shipped. The containers shall be modified to be ventilated such that the portion of the container or containers that house equipment and/or piping containing untreated water or air will be classified as a Class I Division 2 space and the portion that will house the electrical enclosures will be unclassified. CONTRACTOR shall also furnish all materials on the favorably reviewed Materials List and all other materials, labor, and appurtenances necessary for the complete assembly of the treatment plants in the containers. 1.04 Treatment Plant Assembly CONTRACTOR shall furnish and install all equipment, materials, and manpower necessary to assemble the treatment plants in containers as shown on the Assembly Drawings favorably reviewed by ENGINEER. CONTRACTOR shall use OWNER furnished equipment and materials from the favorably reviewed Materials List for the assembly of the treatment plants. No materials other than those on the Materials List shall be used in the assembly of treatment plant unless favorably reviewed by ENGINEER. 1.05 Coordination with ENGINEER CONTRACTOR shall notify ENGINEER, three working days in advance, of when CONTRACTOR will reach a milestone in the assembly of the treatment plant. Treatment plant assembly milestones will be established by ENGINEER with the CONTRACTOR at the Design Meeting. 1.06 Shop Test Prior to shipping the treatment plants to the Site, CONTRACTOR shall demonstrate that the treatment plants perform in accordance 5/11/95 01902.2 PHASE2.DOC with the Contract Documents. The ENGINEER, at its option, may witness this testing. In general, CONTRACTOR shall: 1) Pressure test all the water piping by applying a pressure, using water, equal to one and one half times the working pressure for a period of four hours without leakage. Air piping under vacuum shall be tested both at 10 psi and at a vacuum equal to one and one half times the maximum applied vacuum for a period of four hours without leakage. 2) Demonstrate that each of the interlocks, alarm and shut down conditions performs as specified in the Contract Documents. 3) Simulate the actual operation of the treatment plants using potable water. More detailed shop testing procedures will be developed by ENGINEER and given to CONTRACTOR at the Design Meeting. 1.07 Treatment Unit Shipping After favorable review of the shop test results by ENGINEER, CONTRACTOR shall securely ship treatment plants to Site in accordance with the project schedule. 1.08 Payment Payment for the work performed in this section shall be at the lump sum submitted during Phase 1, which lump sum was based on the favorably reviewed unit costs of Bid Items 2a and 2b as shown in CONTRACTOR'S Proposal. END OF SECTION i UT OOS 5/11/95 01902.3 PHASE2.DOC SECTION 01903 PHASE 3 - ON-SITE CONSTRUCTION AND START-UP PART I — GENERAL 1.01 General CONTRACTOR shall construct a groundwater extraction system and a soil vapor extraction system and a treatment plant at Location 1 and a groundwater extraction system and treatment plant at the Location 2 on the Site. The construction shall include the installation of pumps in the groundwater wells, construction of well heads, piping, conduit, and treatment plants in accordance with the Contract Documents. Construction shall be in accordance with the Department of Public Works ("DPW") Earth Change permit. Also included is the start-up of the system in accordance with the requirements of the Territorial Pollutant Discharge Elimination System ("TPDES") permit and the Department of Planning and Natural Resources ("DPNR") Air Quality permit. OWNER will obtain the Earth Change permit, the TPDES, and the DPNR Air Quality permits and furnish copies to the CONTRACTOR at Design Meeting. CONTRACTOR shall obtain all other permits, including building permits . 1.02 Health and Safety Plan Twenty one days prior to mobilization at the Site, CONTRACTOR shall prepare and submit to ENGINEER a health and safety plan in accordance with applicable occupational health and safety standards and other applicable laws. The plan shall include, at a minimum, the following items: level of personal protection that shall be used; definition of exclusion, contamination reduction, and clean zones; and any required personnel air monitoring. The CONTRACTOR'S health and safety plan shall be prepared and signed by a certified industrial hygienist and shall at a minimum conform to 29 CFR 1910.120. 1.03 Access OWNER will make arrangements for CONTRACTOR'S access to Location 1, Location 2, and the storm drain catch basins. OWNER will provide copies of the access agreements to CONTRACTOR at the Design Meeting. 1.Q4 Well Pumps CONTRACTOR shall provide the pumps and all materials, equipment, appurtenances, and manpower for the construction of pumps and 5/11/95 01903.1 PHASB3.DOC /"**"•••.. valves, meters, and boxes at each groundwater well and valves, meters, and boxes at each soil vapor extraction well, at both Locations on the Site. Provide the pumps, valves, meters, and boxes as shown on the Site Civil Drawings prepared by ENGINEER and reviewed by CONTRACTOR. 1.05 Piping. Conduit, and Wire Provide piping, conduit, and wire as shown on the Assembly Drawings and the Site Civil Drawings. 1.06 Treatment Plants Provide all materials, equipment, and manpower necessary to install the treatment plants at the locations shown on the Site Civil Drawings. CONTRACTOR shall connect treatment plants to the wells, the power supplies, and discharge points at both locations on the Site as shown on the Assembly Drawings and the Site Civil Drawings, and provide testing and start up services in accordance with the Contract Documents and applicable Laws and regulations, including local codes. /*"*s 1.07 As-Built Drawings CONTRACTOR shall maintain As-Built drawings during the performance of the WORK. CONTRACTOR shall prepare and submit complete As- Built Drawings (D Size) for each location on the Site. The As- Built Drawings shall include, at a minimum, P&ID, electrical single line, electrical schematic, plan layout, Site Civil Drawings (ENGINEER will furnish CONTRACTOR one original copy of Site Civil Drawings prepared by ENGINEER) . Complete Record Drawings shall be furnished to ENGINEER within 30 days after the completion of the startup of the treatment systems at both locations on the Site. 1.08 start-UP CONTRACTOR shall perform the following start-up procedures: 1) Pressure test all the groundwater piping by applying a pressure using water equal to one and one half times the working pressure for a period of four hours without leakage. Air piping under vacuum shall be tested both at 10 psi and at one and one half the maximum design vacuum for a period of four hours without leakage, 2) Demonstrate that each of the alarm and shut down /*'**" conditions perform as defined in the Final Design of the WORK, TUT OOS 0481 5/11/95 01903.2 PHASE3.DOC /*"*****" 3) Operate both systems for 24 hours per day for a continuous two week period in accordance with the requirements of the Territorial Pollutant Discharge Elimination System ("TPDES") permit and the Department of Planning and Natural Resources ("DPNR") Air permit. This snail include all sampling and analysis of treated groundwater required by the TPDES permits. Air sampling and analysis will be performed by the equipment supplier. More specific start-up procedures will be developed at the Design Meeting. 1.09 Payment Payment for the work performed in this section shall be at the lump sum submitted during Phase 1, which lump sum was based on the favorably reviewed unit costs of Bid Items 3a, 3b, and 3c as shown in CONTRACTOR'S Proposal. END OF SECTION TUT COS O4S2 5/11/95 01903.3 PHASE3.DOC Attachment A Alarms & Interlocks Assumed Water Quality Existing Monitoring Well Construction Logs ATTA TEXACO TUTU SERVICE STATION CON ,,<OL DESCRIPTION & EQUIPMENT LIST EQUIPMENT ELECTRICAL GROUNDWATER PUMPS (To be supplied by Contractor) CHEMICAL FEED SYSTEM [To be supplied by Contractor) AIR STRIPPER (Owner furnished) CATALYTIC OXIDIZER (Owner furnished) POWER REQMTS 230V 1 Phase 60 Hz 230V 1 Phase 60 Hz 230V 3 Phase 60 Hz 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Remote panel Power loss at panel => Air Flow Meter Temperature gauges Air Blower Silencer Line Sample Ports Low Air Pressure Alarm => (w/adjustabte time delay) High Water level Alarm => Low air flow => High catalyst exit => temperature Liquid Level Switch if => high liquid in V/L separator High temperature in => sound enclosure Power loss at panel => High or low gas pressure => Flame failure => Spark arrester => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BYCONTR(3) Current sensor type <= protection device Power loss at <= chemical feed pump FIRST OUT PANEL (4) YES YES YES YES YES YES YES YES YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES YES YES YES YES YES YES YES YES NOTES: X 1. These are the control options that are Included by the manufacturer with the equipment. If any one of these alarm conditions occurs,. 03 a signal will be sent from that piece of equipment that an alarm condition has been detected. 2. This indicates what should occur if the indicated alarm condition is detected. C 3. These are the control options that shall be designed and installed by the CONTRACTOR. £ 4. A Yes indicates that, if the indicated alarm condition is detected, it should be indicated on a First Out Panel. i> 5. A Yes indicates that, if the alarm condition is detected, it should activate the autodialer. STAPR01.XLS 5/11/95 EKI 840058 00 ATTACHMENT A VITELCO PROPERTY CONTROL DESCRIPTION & EQUIPMENT LIST EQUIPMENT ELECTRICAL GROUNDWATER PUMPS (To be supplied by Contractor) CHEMICAL FEED SYSTEM (To be supplied by Contractor) AIR STRIPPER (Owner furnished) POWER REQMTS 230V 1 Phase 60 Hz 230V 1 Phase 60 Hz 230V 3 Phase 60 Hz OPTIONS BYMFR(1) Remote panel Power loss at panel => Air Flow Meter Temperature gauges Air Blower Silencer Line Sample Ports Low Air Pressure Alarm => (w/adjustable time delay) High Water level Alarm => INTERLOCKS (2) Shutdown Shutdown Shutdown Shutdown Shutdown OPTIONS BY CONTR (3) Current sensor type <- protection device Power loss at <= chemical feed pump FIRST OUT PANEL (4) YES YES YES YES YES AUTODIALER AUTODIALER (5) YES YES YES YES YES NOTES: IOTE5: 1. These are the control option* that are included by the manufacturer with the equipment If any one of these alarm conditions occurs,. a signal will be sent from that piece of equipment that an alarm condition has been detected. 2. This indicates what should occur if the indicated alarm condition is detected. 3. These are the control options that shall be designed and installed by the CONTRACTOR. 4. A Yes indicates that, if the indicated alarm condition is detected, it should be indicated on a First Out Panel. 5. A Yes indicates that, if the alarm condition is detected, it should activate the autodialer. CTAOOOO ¥1 S S/11/85 EKI 840058 00 TABLE 1 ASSUMED INFLUENT ORGANIC WATER QUALITY AND FLOWRATE Texaco Tutu, U.S. Virgin Islands (EKI 940058 00) CO Parameter Design Flowrate Benzene Toluene Ethylbenzene Xylenes (Total) Naphthalene Methyl tert butyl ether (MTBE) 1,2-Dichloroethane (DCA) 1,2-Dichloroethene(DCE) fetrachloroethene (PCE) Trichloroethene (TCE) Vinyl chloride Acetone Methylene Chloride Texaco Tutu Service Station Shallow Max (1) - 23 25 3 17 - 52 NR 0.28 0.031 0.047 0.056 1.7 7 Deep Max (1) - 1.6 0.26 0.065 0.62 - 1.5 0.033 0.52 0.058 0.033 0.15 0.2 0.16 Shallow Max (2) - 21 17 3.7 18 0.76 56 0.29 0.44 0.056 0.02 <5 <5 <5 Deep Max (2) - 1.7 0.048 0.063 0.062 0.016 1.9 <0.02 0.28 0.023 0.017 0.009 <0.02 <0.02 Design (3) 50 17 15 3 13 0.5 46 0.3 0.5 0.05 0.05 0.1 1 4 Vitelco Property MW-7 (2) - 0.021 <0.01 <0.01 <0.01 0.01 0.42 <0.01 0.18 0.13 0.027 <0.01 <0.01 <0.01 Design 20 0.03 0.01 0.01 0.01 0.01 0.5 0.01 0.4 0.2 0.04 0.01 0.01 0.01 NOTES' 1 Maximum concentrations shown are from the GCL Phase I Rl dated 10 June 1994 for monitoring wells between MW-3 and TT-1. 2. Maximum concentrations shown are from the Geraghty & Miller Phase II report dated January 1995 for monitoring wells between MW-3 and TT-1. 3 Design concentrations for the Texaco Tutu Service Station are based on a weighted average of the deep and shallow wells. ' at a combined flowrate of 50 gpm plus a safety factor. In addition, chlorinated VOC concentrations have been increased to allow for possible concentration increase over time. 4. All concentrations are In parts per million. 5. < Indicates reported laboratory analytical result is below detection limit. T1F.XLS 4/13/95 TABLE 2 ASSUMED INFLUENT INORGANIC WATER QUALITY AND FLOWRATE Texaco Tutu, U.S. Virgin Islands (EKI 940058.00) Parameter Assumed Flowrate (gallons per minute) Arsenic Cadmium Chromium Copper Cyanide Lead Mercury Nickel Nitrate (as N) Nitrite (as N) Selenium TEXACO TUTU SERVICE STATION TT1 Shallow (1) Indicator Parameter — <10 0.05 ppm 0.05 ppm Unfiltered Metals _ 2.9 3 4.8 30.2 9.5 0.1 16.5 2 Filtered Metals m 4.6 3 3 3 2 0.1 10 10 Estimated Concentration 30 4 3 3 5 10 3 0.10 12 0.00005 0.00005 10 TT1-D Deep (1) Indicator Parameter _ <10 2.1 ppm 0.1 ppm Unfiltered Metals . 2 3 3 3 2.2 0.1 10 2 Filtered Metals — 2 3 3 3 2 0.1 10 2 Estimated Concentration 20 2 3 3 3 10 2 0.10 10 0.002 0.0001 2 Design (3) 50 3 3 3 4 0.01 3 0.10 11 0.0008 0.0001 6 NQJES; 1. Concentrations shown are from the Geraghty & Miller Phase II report dated January 1995 for monitoring wells TTI (shallow) and TT-1D (deep). 2. All concentrations are in ppb unless noted otherwise. 3. Design concentrations are based on a weighted average of the estimated concentrations for TT1 and TT1-D. 4. < Indicates reported laboratory analytical result Is below detection limit. T2F.XLS Pagel of 2 4/13/95 TABLE 2 ASSUMED INFLUENT INORGANIC WATER QUALITY AND FLOWRATE Texaco Tutu, U.S. Virgin Islands (EKI 940058.00) Parameter Assumed Flowrate (gallons per minute) Arsenic Cadmium Chromium Copper Cyanide Lead Mercury Nickel Nitrate (as N) Nitrite (as N) Selenium VITELCO PROPERTY MW-7 (2) Indicator Parameter . <10 3.2 ppm 0.25 ppm MW-7 (2) Unfiltered Metals . 9.2 3 1050 3 4.8 1 445 2 MW-7 (2) Filtered Metals . 2 3 3 3 2 0.1 15 2 Design 20 2 3 5 3 10 3 0.1 15 3 ppm 0.25 ppm 2 NOTES 1. All concentrations are in ppb unless noted otherwise. 2. Concentrations shown are from the Geraghty & Miller Phase II report dated January 1995 for monitoring well MW-7. 3. < Indicates reported laboratory analytical result is below detection limit. T2F.XLS Page2 of 2 4/13/95 LJTHOLOGK: LOG (CUTTWGS) Pqoe 1 of _.1 LOCATION MAP — 1 OFFICE SITE it* TEXACO TUTU SITE COORDINATES (ft.): N———————,___________E——————— GROUND ELEVATION (ft. MSL): _________ STATE: ST. THOMAS_____ COUNTY: U.S.V.I. DRILLING uPTMOfV AIR ROTARY/HAMMER ORILUNG eQMTB - CARRIBBEAN HYDRO-TECH_____ DATE gTARTirnr 12/2/93 _ _ PATE CQUPLETFn- 12/5/93 (TJELD BFP • MAZZULLO/MOTiTANO ________________ COMMENTS;"____________________________ 1/4 __1/4 S__ T __ R CENTER OF UST PIT AREA LOCATION DESCRIPTION: .LOCATION IO:J!=1_ UTHOLOGIC DESCRIPTION (UTH.. GRAIN SIZE PROPORTIONS. WET COLOR, RNOC., SRTG.. CONSOL. DIST. FEATURES) OJJ-OS QS-9JQ CONCRETE CLAYEY FILL « DARK GRAY TO Q?EEN!SH- GRAY CSC 4/O, GRAVELLY OJP TO 4OO, MOUERATELr PLASTIC CLAY, WITH LOCALLY MODERATE HEAVY-OIL ODOR. WEATHERED BEDROCK ='DARK GREENISH-GRAY <5G 4/0 ANDESITE BRECCIA, WITH DARK GREENISH-GRAY CLAY TILLING INTERSTICES. 16.5-36.0 VOLCANIC BRECCIA = DARK GREENISH-GRAY <5G 4/u AUGITE-ANDESITE BRECCIA, WITH SPORADIC DIKES OR INCLUSIONS OF BLACK <5G 2/l> BASALT BRECCIA. FRACTURES NQTEABLE NEAR 26-27 FT. AND SOFT WEATHERED ZONE NEAR 33 FT. TTJ = 36.0 FT. B/SCHEEN = 28.5 FT. INITIAL WATER LEVEL 13.73 FT. BGL TUT 008 0489 -1 •g£f" UTHOLOGX; LOG (CUTTWGS) HBT pog«_L_ of i y — - — — ROGATION MAP- r + -H -+- OFFICE I SiTF in- TEXACO TUTU i nr.AT!aN in-. TT-1 ^ ill- COOKDlNAfES (ft.): DIES SM V ;EL 3 TT-1 o •f-LD PUMPS RT 38 GRO STAT ORIL DRIL DATE F1EU LJNP FIB/ATION (ft MSI v T- ST. THOMAS hQUNTYt U.S.V.I. IINC urrwnry AIR ROTARY /HAMMER i iwr: mwTP • CARRIBEAN HYDRO-TECH ' <STABTnV 1^/8/93 .. DATE Cm-PIFTFTV 12/8/93 T BPP- MAZ2ULLO/MONTANO ——— ———————— IJJMMflMI^- ,1/4 . 1/4 1/4 1/4 S T R LOCATION DESCR1P1 puiaul • • •10- •15- •20- •25- •30- •35- •40 •50 WELL CONST 4' PVC BLANK 4~ .010- SLQT PVd = = UTH. -into- SOUTH END OF STATION ALONG CURB. 5 FT. WEST OF TT-10 VISUAL r. ^__^ ——————— 1 ——————— •^==3 1 -m_rrrr3 —— ^3 ! i- — =r — 1 —— • _rs?rf?i i I 1 %B i | i i *5s£=31 i i TcrSH ! ' i ' :>a^=^ | <gSgpt2 1 . « „' '„ « "d 1 1 1 'O m- 1 1 % , - * • • ' 7 -* -J »A > ' 1 . */ u > ^» J/ •* T 1- 1 \ \ I I i i i I i I I I i I ! ! t i I I t i i i i ' ' f i ——— I ————— h- i i ii I i i i t _ _ _ _ . ! i \ \ \ i i i i i i i SAMPLE TYPE PID HEAD- SPACE -HEAD- SPACE -HEAD- SPACE -PID -PID 1 r—PID —PID —PID • PID NTERVAL 5 ppn 94 ppn 48 ppn 19 ppn 7 ppn 16 ppn 121 ppn 24 ppn 6 ppn 5 ppn UTHOLOG1C DESCRIPTION (UTH.. GRAIN SIZE PROPORTIONS. WET COLOR. RNOG.. SRTG.. CONSOL.. DIST. FEATURES) 0.0-OS CEMENT 0»5-5.0 CLAY = MODERATE GREENISH-GRAY <5B 5/1). MODERATE PLASTICITY, SANDY TO PEBBLY (HO-25X). WITH MILD WASTE OIL ODOR. 5.0-7.5 CLAY - OLIVE-GRAY C5Y 4/1), MODERATE PLASTICITY, SANDY CIO- 157.) WITH SOME LARGER ROCKS AND TREE ROOTS. 7.5-15.0 PEBBLY CLAY = GRAY-GREEN <5G 4/1), MODERATE PLASTICITY, 15-20X PEBBLES <LOCALLY HIGHER PROPORTION). 15.0-2LO WEATHERED BEDROCK = DARK GREENISH- GRAY (5G 4/1), ALTERED ANDESITE AND BASALT BRECCIA, WITH INTERSTITIAL CLAY. 21.0-36.3 VOLCANIC BRECCIA = FRACTURED. BLACK (5G 2/1). BASALT BRECCIA. DOWN TO FRACTURED, DARK GREENISH-GRAY (5G 4/1), AUGITE-ANDESITE BRECCIA. SLIGHT GASOLINE ODOR TOWARDS BOTTOM. TD = 36.3 FT. B/ SCREEN = 30 FT, INITIAL WATER LEVEL = 12.45 FT. BGL IU| <J08 n4o,, —— Attachment B OWNER Furnished Equipment KING, BUCK & ASSOCIATES, INC. FOR THE JOINT VENTURE KING,BUCK/CATALYTIC Specializing m the energy and chemical processing industries HD CatOx™ Halocarbon Destruct Catalytic Oxidation System Pictured below is a King,Buck/Catalytic HD CatOx system. This system, with a capacity of 200 scfrn, is one of the several HD CatOx systems that have been permitted by the South Coast Air Quality Management District. The HD CatOx was designed. and constructed" by King,Buck/Catalytic and utilizes an Allied Signal Purzaust® HOC catalyst selected for its effectiveness with chlorinated organic compounds. This HD CatOx system is being used in a soil remediation project in which both hydrocarbons and chlorinated hydrocarbons are present. The system was compactly packaged so that it would occupy one parking space on the top floor of a multi-story parking garage. It consists of a vacuum/compressor, heat exchanger, process heater, fixed bed catalytic reactor, neutralizing scrubber, and self contained cooling system. The by-products of this remediation system are carbon dioxide, water and a solution of sodium chloride and sodium bicarbonate. Since start-up in 1991, its on-stream operating record has been nearly perfect. For more information on how the HD CatOx can economically solve soil remediation projects, please contact us. 2356 Moore Street, Suite 102 • San Diego, California 92110 • Telephone (619) 299-8431 • Fax (619) 299-8437 raOHURRKT * COHMD*—Ju, I Recipient hold* thi* document in truit. Not to be di*clo*«d to other* or copied without peninion froo OHHUM BmrnoMnmL. we. Exotrterm Control Sound Enclosure CATALYTIC OXIOIZER Vent Gas 2.5* Female NPT Connection Point Shuts down the system II the minimum llow Is not met, approx. 70-80 CFM Shuts down the system II the catalyst exit temperature exceeds 1100'F TIC1-Selpolnlt controls power going to the electric prehealer, keeping the temperature at Id at the selpolnt value TIC1-Selpolnl2 shuts down the system It the Intel temperature drops below selpolnl value, 600*F TIC3 sends 4-20mA signal to Vacuum Indicating Controller based on *F deviation Irom exit temperature set point Shuts down the system II the liquid level In the vapor/liquid separator trips the high level switch Vacuum signal transmitter sends 4-20mA signal to Vacuum Indicating Controller based on operating vacuum Vacuum Indicating Controller controls dilution air llow by adjusting a butterfly valve to Increase or decrease vacuum Flow transmitter sends signal to remote communication system Icl(thermocouple II,type K) sends temperature signal to remote communication system Ic2(ihermocouple ta.lype K) sends temperature signal to remote communication system lc3(thermocouple »3,lype K) sends temperature signal to remote communication system Flow signal transmitter tends 4-20mA signal to Flow Indicating Controller based on operating llow I Flow Indicating Controller controls flow by regulating the recycle llow around the compressor I Shuts down the system II the air temperature In the sound enclosure exceeds 210'F Legend: "S. Electrical Control Signal DAV-A Dilution Air Conlrol Valve - Automatic DAV-M Dilution Air Conlrol Valve - Manual Fl Flow Indicator FIC Flow Indicating Controller FS Flow Sensor FT Flow Transmitter HTR Healer TUT Hx Heal Exchanger LSwH Liquid Level Switch M Dilution Air Control Actuator Motor PSwL Low Row Limit Pressure Switch RCV-A Reclrculalion Conlrol Valve - Automatic RCV-M Reclrculalion Conlrol Valve - Manual lc Thermocouple Tl Temperature Indicator TIC Temperature Indicating Controller TSwH High Limit Temperature Switch TSw Temperature Switch VA. Vapor/Liquid Separator VCU Vacuum Compressor Unit VI Vacuum Indicator VIC Vacuum Indicating Controller VT Vacuum Transmitter P & I D CatOx-200 with Options CAMKRON ENVIRONMENTAL, INC. MMC-6AE (electric prehealer) P40015.1 Drwn. By 3-30-94 Inspec^v: Air is vented co the atmosphere or to vapor phase treatment of choice. Turbulent frothing maximizes volatilization and scours the aeration trav. Water travels around the full length of the baffled tray, becoming progressively cleaner. Contaminated water inlet. Treated water falls into holding tank. o Vif," holes resist fouling. Fan blows air up through hundreds of holes into the water. C Tljis illustration is representative of the ShalloicTray9 Model 2611. Protected under U.S. Patent Nos. 5,045,215 and 5,240,595. Other International Patents Pending. TUT i on front cover: top view of 23CC Scries aeration tray in action. 'hoto on back coven cross section of a ShallowTray in action. i "... T.... :. . —;f*a,aA rr-iHcmirk ,ii \,.rr'n H.;-r rinvirtMimerit.il Prtxlucrs. Inc. Printed on recycled paper 51294 The graphs represent approximate removal efficiencies at 50°F. Use the ShallowTray® Modeler™ software to calculate expected performance. flow a mm. approx. els rate trays width length height cfm Ibs. 3611 621 3631 641 3651 3-135gpm 3-135gpm 3-135gpm 3-135gpm 3-135gpm 1 2 3 4 5 5'0" 5'0" 5'0" 5'0" 5'0" 6'2" 6'2" 6'2" 6'2" 6'2" 5'0" 5'9" 6'6" 7'3" 8'0" 900 900 900 900 900 1240 1440 1640 1840 2040 p r o f i l e a i r s t r i p p e r s e a i r s t r i p p e r s JFesssjjjsfjjz^ 3600 AERATION TRAY WATEH INLET CHAMBER OUTLET TO OOVWCOMER TOP VIEW Percent Removal vs. Flow Rate iTCE Five Trays Benzene MTBE iTCE I Benzene MTBE Four Trays TCE: Benzene "'• MTBE Three Trays <o O E Benzene MTBE Two Trays Benzene , MTBE One Tray 3600 M> a» 30 « SD ao TO ao s Percent of Rated GPM GPM 0 25 50 75 100 125135 fi [ Model Pictured: 3651 Options chosen for system pictured: 2 EXP Feed and Discharge pumps ^NEMA 3R main disconnect switch 3f Low air pressure alarm switch Sf High water level alarm switch §f Discharge pump level switch Sf Water pressure gauges ^Digital water flow indicator and totalizer C fcal 365t Cbnfisuration^ CXEAN-OUT - POSTS DRAIN VALVE- - ,OW 4iR POESS. r a" FRONT VIEW RIGHT SIDE VIEW 'Use these drawings as a guideline oniy. Systems are built to your project's specifications. TUT The graphs represent approximate removal efficiencies at 50°F. Use the ShallowTray® Modeler™ software to calculate expected performance. •:? flow j*ade\s rate 311 1381 .331 341 1351 0.5-22.5gpm 0.5-22.5gpm 0.5-22.5gpm 0.5-22.5gpm 0.5-22.5gpm # trays 1 2 3 4 5 width 3'0" 3'0" 3'0" 3'0" 3'0" length 3'2" 3'2" 3'2" 3'2" 3'2" height 5'0" 5'9» 6'6" 7'3" 8'0" min. CilVh 150 150 150 150 150 approx. Ibs. 700 760 820 880 940 2--Virei-co w p r o f i l e a i r s t r i p p e r s e a i r s t r i p p e r s jtbs^jjgjj^ 1300 AERATION TRAY LET + I r ii i UJ 1 1 OUT i 10 I Percent Removal vs. Flow Rate ITCE! i Five Trays Four Trays Benzene MTBE ITCE: Benzene MTBE TCE Benzene ""'• TOP VIEW Percent "of "Rated GPM 1300 GPM 0 10 15 1300 series f————, L Model Pictured: 1331 Options chosen for system pictured: SfNone FRONT VIEW 'Use these drawings as a guicsiine only Systems are built to your project's specifications. RIGHT SIDE VIEW UT 10 Erler & Kalinowski, inc. /"**N E-2 Design and Construction Concept The two remedial systems proposed to remediate groundwater and soil at the Service Station Site and groundwater at ihe Vitelco Site include the following: 1) a groundwater extraction and treatment system and a soil vapor extraction and treatment system at the Service Station Site (described as Location 1 in the plans and specifications) and 2) a groundwater extraction and treatment system at the Vitelco Site (described as Location 2 in the plans and specifications). TCI has selected Aqua Design, Inc. based in Campbell, California to perform the design and construction of the remedial systems. TCI has also selected Global Technologies, Inc. based in Milwaukee, Wisconsin to supply the catalytic oxidation equipment and Northeast Environmental Products, Inc. based in West Lebanon, New Hampshire to supply the air stripper equipment for the remedial systems. The design and construction phase of the proposed groundwater and soil remedial systems will consist of three phases. The three phases will include design, assembly of treatment plants, and on-site construction as summarized below. 1) Design - Aqua Design will develop the design based on the information contained in the information itemized above and as developed at the Design Meeting with TCI and EKI (See specification "Section 01901 - Phase 1 - Design" included with this section for a definition of the Design Meeting). 2) Assembly of Treatment Plants - The two treatment plants will be assembled and tested by Aqua Design at their facility in Campbell, California. The catalytic oxidizer and air stripper for the Service Station Site and the air stripper for the Vitelco Site will be supplied by TCI for Aqua Design's installation and testing. The treatment plants will be assembled within a container that is suitable for shipping the treatment plants to St. Thomas, U.S. Virgin Islands and suitable as permanent housing for the treatment plants once they are installed at each location at the Site. 3) On-Site Construction - Aqua Design will construct the extraction systems and install the treatment plants at the Service Station Site and the Vitelco Site. Aqua Design will then test and start-up the remedial systems at both sites under the supervision of EKI. TUT OO8 O5OO E-2.1 Section E (EKI 940058.03) c CO Erler & Kalinowski, Inc. E-3 Documents to be Transmitted to EPA and DPNR The following documents will be transmitted to EPA and DPNR for review after completion of the construction and start-up of the remedial systems. • System "As-Builts" • Long Term Monitoring Plan • Results of Start-Up and Vacuum Influence Testing • Systems Operations and Maintenance Manual TUT OOS O55O2 E-3.1 Section E (EKI 940058.03) Erler & Kalinowski, Inc. REFERENCES Donnelly, T.W., 1966, Geology of St. Thomas and St. John, Virgin Islands. Caribbean Geologic Investigations. H.H. Hess, ed., Geologic Society of America Memoir 98, pp. 15-121. GCL Environmental Science and Engineering, 1994, Phase 1 Remedial Investigation Report, St. Thomas, U.S. Virgin Islands, revised 10 June 1994. Geraghty & Miller, Inc., 1992, Technical Memorandum I, Tutu Wells Site, St. Thomas, U.S. Virgin Island, April 1992. Geraghty & Miller, May 1993, Technical Memorandum II, Results of the Field Program, Tutu Service Station Investigation, St. Thomas, U.S. Virgin Islands. Geraghty & Miller, 1994, Development and Screening of Remedial Alternatives, Tutu Wells Site, St. thomas, U.S. Virgin Islands. Geraghty & Miller, 1995a, Phase II Remedial Investigation, Tutu Wells Site, St. Thomas, U.S. Virgin Islands, 3 volumes, dated 6 April 1995. Geraghty & Miller, 1995b, Feasibility Study, Tutu Wells Site, St. Thomas, U.S. Virgin Islands, dated March 1995. Hydrogeologic Associates U.S.A., Inc., 1993, Geohydrologic Analysis and Water Quality Data for the Upper Tutu Aquifer, St. Thomas, Virgin Islands. Jordon, D.G. and Cosner, O.J., 1973, A Survey of the Water Resources of St. Thomas Virgin Islands, U.S. Geological Survey Open-File Report, 1973, 55 pp. Lebron Associates, January 1990, Final Report of Tanks Removal at Texaco Caribbean, Inc.'s Tutu St. Thomas, USVI Service Station, (with) Analysis of Laboratory Results for Soil Sampling Activities, Texaco Service Station, Tutu, St. Thomas, U.S. Virgin Islands. Stevens, K.E., F. Gomez-Gomez, and J. Alicia, 1981, Water Wells in the U.S. Virgin Islands, Part 1, St. Thomas, U.S. Geological Survey Open File Report 82- 82. Waterloo Hydrogeologic Software, 1994, Flowpath, version 5, Two-Dimensional Horizontal Aquifer Simulation Model. OO8 OSO4 E-4.2 Section E (EKI 940058.03) EPA REGION II SCANNING TRACKING SHEET DOC ID #65038 DOC TITLE/SUBJECT: TUTU WELLS SUPERFUND SITE PRELIMINARY ACCELERATED SCHEDULE FOR PLANNING, DESIGN, AND CONSTRUCTION OF GROUNDWATER AND SOIL REMEDIATION SYSTEMS AT TUTU TEXACO SERVICE STATION (Page: TUT 008 0505) THIS DOCUMENT IS OVERSIZED AND CAN BE LOCATED IN THE ADMINISTRATIVE RECORD FILE AT THE SUPERFUND RECORDS CENTER 290 BROADWAY, 18TH FLOOR NEW YORK, NY 10007 Erler & Kalinowski, Inc. E-4 Schedule The design and construction of the remedial systems for the Service Station Site and the Vitelco Site are scheduled to be completed by 29 November 1995. The proposed schedule is included at the end of this Sub Section. TUT OO8 O5O6 E-4.1 Section E (EKI 940058.03)