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de maximis TuTu Wellfield Superfund Site St. Thomas U.S. Virgin Islands F.S. Addendum February 1996 de maximis, inc. PAPER *65035* 65035 de maximis F.S. Addendum Index The following tables have been revised to reflect the deletion of the need to perform soil remedies at Tillett Gardens and at Ramsey Motors. 4-5R - Summary of Estimated Impacted Soil Volumes, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. 4-6R - Evaluation of No Action/Institutional Controls Technologies Option on Property-Specific Basis, Tutu Wells Site, U.S. Virgin Islands. 4-7R - Evaluation of Capping Technology Option on Property-Specific Basis, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. 4-8R - Evaluation of In-Situ SVE and Bioventing Technologies Option on Property-Specific Basis, Tutu Wells Site, U.S. Virgin Islands. 4-9R - Evaluation of Ex-Situ SVE and Biopiles Technology Option on Property- Specific Basis, Tutu Wells Site, U.S. Virgin Islands. 4-1 OR - Evaluation of Excavation and Off-Site Disposal Technology Option on Property-Specific Basis, Tutu Wells Site, U.S. Virgin Islands. 5-4R - Cost Estimate - SRA 2 (Institutional Controls/Capping), Tutu Wells Site, St. Thomas, U.S. Virgin Islands. 5-5R - Cost Estimate - SRA 3 (Institutional Controls/Capping/ln-Situ SVE [Soil and Bedrock]/Excavation and Off-Site Disposal), Tutu Wells Site, St. Thomas, U.S. Virgin Islands. 5-6R - Cost Estimate - SRA 4 {Institutional Controls/Capping/Ex-Situ SVE/Excavation and On-Site Disposal), Tutu Wells Site, St. Thomas, U.S. Virgin Islands. 5-7R - Cost Estimate - SRA 5 (Institutional Controls/ln-Situ SVE [Bedrock]/Excavation and Off-Site Disposal), Tutu Wells Site, St. Thomas, U.S. Virgin Islands. 5-12R - Cost Comparison of Remedial Alternatives, Tutu Wells Site, St. Thomas, U.S. Virgin Islands. PAPER Table 4-5R. Summary of Estimated Impacted Soil Volumes, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Property Curriculum Center Texaco TuTu Service Station Esso TuTu Service Station Western Auto O'Henry Dry Cleaners • • • • • - > V • - ' • ' '•- \ . Constituents of Concern BTEX, and 1,1,1-TCA Benzene and ethylbenzene PCE, 1,1-DCA, 1,2-DCE, BTEX Benzene, toluene and xylene PCE Estimated Area of Impacted Soils (area, ft z) [A] 240 200 25 '5l 290 l61 25 (6i 50'" 1 90 '" 200 I8) 150 440 460 '91 400 Depth to Bottom of Impacted Soils • : (feet) IB] 0.5 5 4 9 8 12 9 9 6 7 2 8 Thickness :«;*' ';:'";8,--r :--: v>':. '•- v"'.. (feet) [C] 0.5 5 2 9 1 4 0 0 6 7 2 8 Volume of soils ; Previously1* Remediated " (cubic yards) (1) [D] 0 0 0 20 0 0 63 67 10 25 0 0 TOTAL: ; -Volume of soils Requiring Excavation , (cubic yards) . " - . • - HAxB)/27] 5 37 4 97 7 22 0 0 33 114 34 119 472 Soil Volume Currently Requiring Remediation (cubic yards) (2) [(AxC)/27-DI 5 37 2 77 1 8 0 0 23 89 34 119 395 ft2 Square feet. (1) Soil removed during previous tank removals as part of early removal actions prior to FS. (2) In some instances, soil volumes that need to be excavated may include soils that do not require remediation or that were previously remediated Therefore soil volume excavation may be different from those requiring remediation. ' vuiumea (3) (deleted). (4) (deleted). (5) Area around individual impacted soil samples is assumed to be 5' x 5'. (6) Near north oil/water separator at Esso. (7) Includes soil samples B-101 and B-102 (see previous note 5). (8) Assumes impacted soil removed with installation of new underground storage tanks prior to FS. (9) Includes the 4-inch PVC pipe area at Four Winds Plaza near Western Auto. BTEX Benzene, toluene, ethylbenzene, and xylene. PCE Tetrachloroethene. 1.1-DCA 1,1-Dichloroethane. . T t W llf Id ' 1.2-DCE 1,2-Dichloroethene (cis/trans). cc ... FS Addendum 1,1,1-TCA 1,1,1-Trichloroethane. Revised 2/96 By PCBs Polychlorinated biphenyls. tie maximis. inc. FILE: 3089VTABLE4-5 Table 4-6R. Evaluation of No Action/Institutional Controls Technologies Option on Property-Specific Basis, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Properties Curriculum Center Texaco TuTu Service Station Western Auto Esso TuTu Service Station O'Henry Dry Cleaners Description Deed restrictions for soil and bedrock excavation and groundwater use. Deed restrictions for soil excavation and groundwater use. Deed restrictions for soil excavation and groundwater use. Deed restrictions for soil excavation and groundwater use. Deed restrictions for soil and bedrock excavation and groundwater use. Effectiveness Some natural degradation would occur, but most of the contaminant volume would not be reduced. Limit effectiveness. Some natural degradation would occur, but most of the contaminant volume would not be reduced. Limited effectiveness. Some natural degradation would occur, but most of the contaminant volume would not be reduced. Limited effectiveness. Some natural degradation would occur, but most of the contaminant volume would not be reduced. Limited effectiveness. Some natural degradation would occur, but most of the contaminant volume would not be reduced. Limited effectiveness. Implementability Easily implementated. Easily implementated. Easily implementated. Easily implementated. Easily implementated. Cost Low Low Low Low Low Screening Comments Retained. - Provides comparison for other options. - Required by NCP. Retained. - Provides comparison to other options. - Required by NCP. Retained. - Provides comparison to other options. - Required by NCP. Retained. - Provides comparison to other options. - Required by NCP. Retained. - Provides comparison to other options. - Required by NCP. NCP National Contingency Plan. COC Constituents of Concern. Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. FILE: 3089\TABLE4-6 o Table 4-7R. Evaluation of Capping Technology Option on Property-Specific Basis, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Properties Curriculum Center Texaco TuTu Service Station Western Auto Esso TuTu Service Station O'Henry Dry Cleaners Description Install asphalt paving over impacted soil to reduce infiltration. Inspect and maintain existing concrete paving and replace if necessary. Inspect and maintain existing concrete paving and replace if necessary. Inspect and maintain existing asphalt paving and replace if necessary. Install asphalt paving over impacted soil to reduce infiltration. Effectiveness Effective. Effective. Effective. Effective. Effective. Implementability Easily implementated. Easily implementated. Easily implementated. Easily implementated. Easily implementated. Cost Low Low L.OW Low Low Screening Comments Retained. - Capping can be effective in reducing infiltration; easily implemented. Retained. - Capping can be effective in reducing infiltration; easily implemented. Retained. - Capping can be effective in reducing infiltration; easily implemented. Retained. - Capping can be effective in reducing infiltration; easily implemented. Retained. - Capping can be effective in reducing infiltration; easily implemented. FILE: 3089VTABLE4-7 Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. Table 4-8R. Evaluation of In-Situ and Bioventing Technologies Option on Property-Specific Basis, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Properties Curriculum Center Texaco TuTu Service Station Western Auto Esso TuTu Service Station O'Henry Dry Cleaners Description In-situ SVE or bioventing in soil and in-situ SVE in bedrock. In-situ SVE or bioventing in soil. In-situ SVE or bioventing in soil. In-situ SVE or bioventing in soil. In-situ or bioventing in soil and in- situ SVE in bedrock. Effectiveness Potentially effective. Bioventing would not be effective for chlorinated VOCs. Potentially effective. SVE and bioventing would be potentially effective for BTEX concentrations. Not effective in tight clay formations. Potentially effective. SVE and bioventing would be potetially effective for BTEX. Bioventing would not be effective due to the presence of chlorinated VOCs. Potentially effective. Bioventing would not be effective due to the presence of chlorinated VOCs. Implementabilit :v---y: ':-;.; Implementable. Implementable. Implementable. Implementable. Implementable. Cost High costs for bedrock. Costs would be prohibitively high for soil due to small volume. Modereate to high. Moderate to high. Moderate. Moderate. Screening Comments Retained for bedrock. Not retained for soil; not cost effective. Retained. Not retained. - Not effective in clay. Retained. Retained. SVE Sol Vapor Extraction. PBCs Polychlorinated Biphenyls. BTEX Benzene, Toluent, Ethylbenzene, and Xylene. VOCs Volatile Organic Compounds. FILE: 3089VTABLE4-8 Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. Table 4-9R. Evaluation of Ex-Situ and'Biopiles Technologies Option on Property-Specific Basis, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Properties Curriculum Center Texaco TuTu Service Station Western Auto Esso TuTu Service Station O'Henry Dry Cleaners Description Excavate soil and treat using ex-situ SVE or biopiles. Excavate soil and treat using ex-situ SVE or biopiles. Excavate soil and treat using ex-situ SVE or biopiles. Excavate soil and treat using ex-situ SVE or biopiles. Excavate soil and treat using ex-situ SVE or biopiles. Effectiveness This technology will not be effective for unsaturated bedrock which may contain chlorinated VOCs or DNAPL. Potentially effective. May not be potentially effective due to the type of soil being treated (clay). Potentially effective. Potentially effective. Implementability • ' '. • - - " " ' Not implementable for bedrock. Implementable for soil. Implementable. Implementable. Implementable. Implementable. Cost Due to small volume of soil, costs may be high. Moderate to high. Costs would be prohibitively high due to presence of clay. Moderate to high. Moderate to high. Screening Comments Retained for soil. - Not retained for bedrock. - Not effective or implementable for bedrock. Retained. Not retained. - Not cost effective. Retained. Retained. SVE Sol Vapor Extraction. VOCs Volatile Organic Compounds. DNAPL Dense Non-Aqueous Phase Liquids. PCBs Polychlorinated Biphenyls. UST Underground Storage Tank. Tutu Welifield Site FS Addendum Revised 2/96 By de max/mis, inc. FILE: 3089\TABIE4 9 Table 4-10R. Evaluation of Excavation and Off-Site Disposal Technology Option on Property-Specific Basis, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Properties Curriculum Center Texaco TuTu Service Station Western Auto Esso TuTu Service Station O'Henry Dry Cleaners Description Excavate soil, containerize, and ship off- site for disposal. Hazardous waste disposal may be necessary. Excavate soil, containerize, and ship off- site for disposal. Hazardous waste disposal may be necessary. Excavate soil, containerize, and ship off- site for disposal. Hazardous waste disposal may be necessary. Excavate soil, containerize, and ship off- site for disposal. Hazardous waste disposal may be necessary. Excavate soil, containerize, and ship off- site for disposal. Hazardous waste disposal may be necessary. Effectiveness Very effective at removing impacted soil. Bedrock would not be addressed. Very effective at removing impacted soil. Very effective at removing impacted soil. Very effective at removing impacted soil. Very effective at removing impacted soil. Bedrock would not be addressed. Implementability Implementable for soil. Not implementable for bedrock. Implementable for soil. Implementable for soil. Implementable for soil. Implementable for soil. Not implementable for bedrock. Cost High High High High High Screening Comments Retained for soil. - Not retained for bedrock. - Not implementable. Retained. Retained. Retained. Retained. UST Underground Storage Tank. Tutu Welifield Site FS Addendum Revised 2/96 By de max/mis, inc. FILE: 3089UABLE410 Table 5-4R, Page 1 of 2 Table 5-4R. Cost Estimate - SRA 2 (Institutional Controls/Capping), TuTu Wells Site, St. Thomas, U.S. Virgin Islands. /*"•"- f — ITEMS QUANTITY UN CAPTIAL COSTS IIT UNIT COST TOTAL COST Deed Restrictions 1 L.S. $10,000 $10,000 Pavement Restoration & Capping Curriculum Center 27 S.Y. $20 $540 Texaco TuTu Service Station • 25 S.Y. $20 $500 Esso TuTu Service Station 41 S.Y. $20 $820 Western Auto 117 S.Y. $20 $2,340 O'Henry Dry Cleaners 44 S.Y. $20 $880 Subtotal . . Administratii Engineering Construction Contingency TOTAL CAPI TOTAL CAPITAL COST - SRA 2 . . . . . . . . . . . . . . . . . . . . . . . . TOTAL CAPITAL COST - SCP AT ESSO fin-Situ SVE) . . . . . . . . . TOTAL CAPITAL COST - SCP AT TEXACO tin-Situ SVE) . . . . . . . TOTAL CAPITAL COSTS - SRA 2 AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $15,080 •>n & Legal Costs (20%) . . . . . . . . . . . . . . . . $3,016 Design (10%) . . . . . . . . . . . . . . . . . . . . . . . $ 1,508 Supervision {15%} . . . . . . . . . . . . . . . . . . . $2,262 (25%) . . . . . . . . . . . . . . . . . . . . . . . . . . . $3,770 TAL COST $25,636 SAY $26,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $26,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $150,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $135,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $31 1,000 O&M (ANNUAL) COSTS - SRA 2 Pavement & Cap Maintenance (Sealing, Patching) Curriculum Center 27 S.Y. $3 $81 Texaco TuTu Service Station 25 S.Y. $3 $75 Esso TuTu Service Station 41 S.Y. $3 $123 Western Auto 117 S.Y. $3 $351 O'Henry Dry Cleaners 44 S.Y. $3 $132 f~* Subtotal Admin/strati Contingency TOTAL ANhi O&M (ANNUAL) PRESENT WORTH - SRA 2, YEAR 30 (3% discour Pavement & Cap Replacement 1 L.S O&M PRESENT WORTH - SRA 2, YEAR 15 (3% discount rate) . . TOTAL O&M PRESENT WORTH - SRA 2 .................. $762 on & Legal Costs (15%) $ 1 14 (25%) $191 UAL O&M COSTS $1,067 it rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . $20,920 $5,000 $5,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $3,260 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $24,280 SAY $24,000 Table 5-4R, Page 2 of 2 ITEMS QUANTITY UNIT UNIT COST TOTAL COST O&M (ANNUAL) COSTS (TO YEAR 5) - SCPs (continued) f—., SCP at Esso " 1 L.S. $20,000 $20,000 SCP at Texaco 1 L.S. $67,000 $67,000 O&M (ANNUAL) PRESENT WORTH - SCPs, YEAR 5 (3% discount rate) . . . . . . . . . . . . . . . . . . . . . . . . . . . . $398,434 TOTAL O&M PRESENT WORTH - SCPs (In-Situ SVE) SAY . . . . . . . . . $399,000 TOTAL O&M PRESENT WORTH - SRA 2 AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $423,000 GRAND TOTAL - SRA 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $50,000 GRAND TOTAL - SRA 2 AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $734.000 L.S. Lump Sum. C.Y. Cubic Yard. S.Y. Square Yard. SRA Soil Remedial Alternative. SCP Source Control Plan. O&M Operation and Maintenance. Source (design and O&M assumptions) used for cost estimate is presented in Appendix C. Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. FILE: 3089VTABLE5-4 Table 5-5R, Page 1 of 2 Table 5-5R. Cost Estimate - SRA 3 (Institutional Controls/Capping/In-Situ SVE [Soil and Bedrock]/Excavation and Off- Site Disposal), TuTu Wells Site, St. Thomas, U.S. Virgin Islands. /"— v 0 ITEMS QUANTIT UN : : V.',- ': " ' : I' • Y ' f . ' - ' , . - , , ' ' . . ' CAPTIAL COSTS Deed Resrictions 1 L.S Pavement Restoration & Capping T UNIT COST TOTAL COST $10,000 $10,000 Curriculum Center 5 C.Y. $70 $350 Excavation 5 C.Y. $2,230 $11,150 Off-Site Disposal 5 C.Y. $50 $250 Excavated soil sample analysis 1 EA Western Auto Excavation 181 C.Y Off-Site Disposal 146 C.Y Site Restoration 181 C.Y Excavated soil sample analysis 9 EA In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S O'Henry Dry Cleaners (in soils) 1 L.S O'Henry Dry Cleaners (in bedrock) 1 L.S Subtotal . . . Administrate Engineering L Construction Contingency TOTAL CAP/' TOTAL CAPITAL COST - SRA 3 . . . . . . . . . . . . . . . . . . . . . . . . TOTAL CAPITAL COST - SCP AT ESSO fin-Situ SVE) . . . . . . . . . TOTAL CAPITAL COST- SCP AT TEXACO [In-Situ SVE) . . . . . . . TOTAL CAPITAL COSTS - SRA 3 AND SCPs . . . . . . . . . . . . . . . O&M (ANNUAL) COSTS - SRA 3 In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S. O'Henry Dry Cleaners (in soils) 1 L.S. O'Henry Dry Cleaners (in bedrock) 1 L.S. $1,500 $1,500 $70 $12,670 $2,230 $325,580 $50 $9,050 $1,500 $13,500 $170,000 $170,000 $50,000 $50,000 $130,000 $130,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $734,050 n & Legal Costs (20%) . . . . . . . . . . . . . . $146,810 design (10%) . . . . . . . . . . . . . . . . . . . . . . $73,405 Supervision (15%) . . . . . . . . . . . . . . . . . $110,108 (25%) . . . . . . . . . . . . . . . . . . . . . . . . . $183,513 TAL COST $1,247,886 SAY $1,248,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,248,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $150,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $135,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 1,533,000 $35,000 $35,000 $14,500 $14,500 $35,000 $35,000 Subtotal $84,500 Administration & Legal Costs (15%) $12,675 Contingency (25%) $21,125 TOTAL ANNUAL O&M COST $ 1 18,300 Table 5-5R, Page 2 of 2 ITEMS QUANTITY UNIT UNIT COST TOTAL COST O&M (ANNUAL) COSTS (TO YEAR 5) - SRA 3 (continued) O&M (ANNUAL) PRESENT WORTH - SRA 3, YEAR 1 TO 5 (3% discount rate) . . . . . . . . . . . . . . . . $541,776 O&M (ANNUAL) COSTS (YEARS 6 TO 30) - SRA 3 In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S. $35,000 $35,000 O'Henry Dry Cleaners (in bedrock) 1 L.S. $35,000 $35,000 Subtotal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $70,000 Administration & Legal Costs 115%) . . . . . . . . . . . . . . . $10,500 Contingency (25%) . . . . . . . . . . . . . . . . . . . . . . . . . . $17,500 TOTAL ANNUAL O&M COST $98,000 O&M (ANNUAL) PRESENT WORTH - SRA 3, YEAR 6 TO 30 (3% discount rate) . . . . . . . . . . . . . . $1,472,007 EQUIPMENT INSTALLATION AND MATERIAL REPLACEMENT - SRA 3 Major Equipment 1 L.S. $160,000 $160,000 O&M PRESENT WORTH (YEAR 1 5) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $102,704 Minor Equipment 1 L.S. $5,000 $5,000 O&M PRESENT WORTH (YEARS 5, 10, 15, 20, 25) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . $16,400 TOTAL O&M PRESENT WORTH - SRA 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,1 33,000 O&M (ANNUAL) COSTS (TO YEAR 5) - SCPs SCP at Esso 1 L.S. $20,000 $20,000 SCP at Texaco 1 L.S. $67,000 $67,000 O&M (ANNUAL) PRESENT WORTH - SCPs, (YEAR 5) 3% discount rate . . . . . . . . . . . . . . . . . . . . . $398,434 TOTAL O&M PRESENT WORTH - SCPs (In-Situ SVE) SA Y $399,00 TOTAL O&M PRESENT WORTH - SRA AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,532,000 GRAND TOTAL - SRA 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $3,381,000 GRAND TOTAL - SRA AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $4,065,000 L.S. Lump Sum. EA. - Each. S.Y. Square Yard. C.Y. Cubic Yard. SVE Soil Vapor Extraction. O&M Operation and Maintenance. SRA Soil Remediation Alternative. SCP Source Control Plan. Source (design and O&M assumptions) used for cost estimate is presented in Appendix C. FILE: 3089\TABLE5-5. Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. OOP Table 5-6R, Page 1 of 2 Table 5-6R. Cost Estimate - SRA 4 (Institutional Controls/Capping/Ex-Situ SVE/ln-Situ SVE/Excavation and On-Site Disposal), TuTu Wells Site, St. Thomas, U.S. Virgin Islands. ^•""•"•kl / >»•»••. / ——— s ITEMS QUANTITY UNI CAPITAL COSTS Deed Restrictions 1 L.S Pavement Restoration & Capping Western Auto Excavation 181 C.Y Off-Site Disposal 146 C.Y Site Restoration 181 C.Y Excavated soil sample analysis 9 EA Ex-Situ SVE Systems Curriculum Center 1 L.S O'Henry Dry Cleaners 1 L.S In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S O'Henry Dry Cleaners (in bedrock) 1 L.S Subtotal . . Administratic Engineering L Construction Contingency TOTAL CAPI COST TOTAL CAPITAL COST - SRA 4 . . . . . . . . . . . . . . . . . . . . . . . . . TOTAL CAPITAL COST- SCP AT ESSO (In-Situ SVE) . . . . . . . . . . TOTAL CAPITAL COST- SCP AT TEXACO (In-Situ SVE) . . . . . . . . TOTAL CAPITAL COSTS - SRA 4 AND SCPs . . . . . . . . . . . . . . . . O&M (ANNUAL) COSTS - SRA 4 Ex-Situ SVE Systems Curriculum Center 1 L.S. O'Henry Dry Cleaners 1 L.S. In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S. O'Henry Dry Cleaners (in bedrock) 1 L.S. T UNIT COST TOTAL COST $10,000 $10,000 $70 $12,670 $2,230 $325,580 $50 $9,050 $1,500 $13,500 $10,000 $10,000 $35,000 $35,000 $170,000 $170,000 $130,000 $130,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $715,800 n & Legal Costs (20%) . . . . . . . . . . . . . $ 143, 160 design (10%) . . . . . . . . . . . . . . . . . . . . . $71,580 Supervision (15%) . . . . . . . . . . . . . . . . $107,370 (25%) . . . . . . . . . . . . . . . . . . . . . . . . $1 78,950 TAL $1,216,860 SAY $1,217,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,217,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $150,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $135,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,502,000 $12,000 $12,000 $12,000 $12,000 $35,000 $35,000 $35,000 $35,000 Subtotal $94,000 Administration & Legal Costs (15%) $14,100 Contingency (25%) $23,500 TOTAL (ANNUAL) O&M COSTS (YEARS 1 AND 2) - SRA 4 $ 131,600 TUT 008 0309 Table 5-6R, Page 2 of 2 ITEMS QUANTITY UNIT UNIT COST UNIT COST O&M (ANNUAL) COSTS (YEARS 1 AND 2) - SRA 4 (continued) O&M PRESENT WORTH (Years 1 and 2) (3% discount rate) . . . . . . . . . . . . . . . . . . . . . . . . . . $251,816 In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S. $35,000 $35,000 O'Henry Dry Cleaners (in bedrock) 1 L.S. $35,000 $35,000 Subtotal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $70,000 Administration & Legal Costs (15%) . . . . . . . . . . . . . . . $10,50O Contingency (25%) . . . . . . . . . . . . . . . . . . . . . . . . . . $17,500 TOTAL (ANNUAL) O&M COSTS (YEARS 3 TO 30) - SRA 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $98,000 O&M PRESENT WORTH (Years 3 to 30 (3% discount rate) . . . . . . . . . . . . . . . . . . . . . . . . . $1,733,324 EQUIPMENT INSTALLATION AND MATERIAL REPLACEMENT - SRA 4 Major Equipment 1 L.S. $160,000 $160,000 O&M PRESENT WORTH (YEAR 1 5) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $102,704 Minor Equipment 1 L.S $5,000 $5,000 —,x O&M PRESENT WORTH (YEARS 5, 10, 15, 20, 25) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . $16,400 TOTAL O&M PRESENT WORTH - SRA 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,104,244 SAY $2,104,000 O&M (ANNUAL) COSTS (TO YEAR 5) - SCPs SCP at Esso 1 L.S. $20,000 $20,000 SCP at Texaco 1 L.S. $67,000 $67,000 O&M (ANNUAL) PRESENT WORTH - SCPs, (YEAR 5) 3% discount rate . . . . . . . . . . . . . . . . . . . . . $398,434 TOTAL O&M PRESENT WORTH - SCPs (In-Situ SVE} SA Y $399,000 TOTAL O&M PRESENT WORTH - SRA 4 AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,503,000 GRAND TOTAL - SRA 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $3,321,000 GRAND TOTAL - SRA AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $4,005,000 L.S. Lump Sum. EA. Each. S.Y. Square Yard. C.Y. Cubic Yard. SVE Soil Vapor Extraction. O&M Operation and Maintenance. SRA Soil Remediation Alternative. SCP Source Control Plan. Source (design and O&M assumptions) used for cost estimate is presented in Appendix C. Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. FILE: 3089VTABLE 5-6. TUT COS O31< Table 5-7R, Page 1 of 2 Table 5-7R. Cost Estimate - SRA 5 (Institutional Controls/Capping/ln-Situ SVE [Bedrock]/Excavation and Off-Site Dispo.sal), TgTu Wells Site, St. Thomas, U.S. Virgin Islands. ITEMS QUANTITY UNIT UNIT COST TOTAL COST CAPITAL COSTS Deed Restrictions Excavation Off-Site Disposal Site Restoration Excavated soil sample analysis In-Situ SVE Systems Curriculum Center O'Henry Dry Cleaners 1 305 270 305 16 L.S. C.Y. C.Y. C.Y. EA. L.S. L.S. $10,000 $70 $2,230 $50 $1,500 $170,000 $130,000 $10,000 $21,350 $602,100 $15,250 $24,000 $170,000 $130,000 Subtotal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $972,700 Administration & Legal Costs (20%) . . . . . . . . . . . . . $291,810 Engineering Design (10%) . . . . . . . . . . . . . . . . . . . . . $97,270 Construction Supervision (15%)................ $145,905 Contingency (25%) . . . . . . . . . . . . . . . . . . . . . . . . $243,175 TOTAL CAPITAL $1,750,860 COST SAY $1,750,000 TOTAL CAPITAL COST - SRA 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,750,000 TOTAL CAPITAL COST - SCP A T ESSO (In-Situ SVE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $150,000 TOTAL CAPITAL COST - SCP A T TEXACO (In-Situ SVE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $135,000 TOTAL CAPITAL COSTS - SRA 5 AND SCPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,035,000 O&M (ANNUAL) COSTS - SRA 5 In-Situ SVE Systems Curriculum Center (in bedrock) 1 L.S. $35,000 $35,000 O'Henry Dry Cleaners (in bedrock) 1 L.S. $35,000 $35,000 Subtotal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $70,000 Administration & Legal Costs (15%) . . . . . . . . . . . . . . . $10,500 Contingency 125%) . . . . . . . . . . . . . . . . . . . . . . . . . . $17,500 TOTAL (ANNUAL) O&M COSTS $98,000 O&M PRESENT WORTH - SRA 5 (YEAR 30) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . . . . . $1,920,831 EQUIPMENT INSTALLATION AND MATERIAL REPLACEMENT - SRA 4 Major Equipment 1 L.S. $160,000 $160,000 O&M PRESENT WORTH (YEAR 1 5) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $102,704 Minor Equipment 1 L.S. $5,000 $5,000 O&M PRESENT WORTH (YEARS 5, 10, 15, 20, 25) 3% discount rate . . . . . . . . . . . . . . . . . . . . . . . $16,400 TOTAL O&M PRESENT WORTH - SRA 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,039,935 SAY $2,040,000 Table 5-7R, Page 2 of 2 • ITEMS QUANTITY UNI1 F UNIT COST TOTAL COST O&M (ANNUAL) COSTS (TO YEAR 5) - SCPs (continued) SCP at SCP at TOTAL TOTAL GRAND GRAND Esso 1 L.S. Texaco 1 L.S. O&M (ANNUAL) PRESENT WORTH - SCPs, (YEAR 5) 3% O&M PRESENT WORTH - SCPs (In-Situ SVE) O&M PRESENT WORTH - SRA 5 AND SCPs . . . . . . . . . . TOTAL - SRA 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TOTAL - SRA AND SCPs . . . . . . . . . . . . . . . . . . . . . . . $20,000 $20,000 $67,000 $67,000 discount rate . . . . . . . . . . . . . . . . . . . . . $398,434 SA Y $399,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $2,439,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $3,790,000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $4,474,000 L.S. Lump Sum. EA. Each. S.Y. Square Yard. C.Y. Cubic Yard. SVE Soil Vapor Extraction. O&M Operation and Maintenance. SRA Soil Remediation Alternative. SCP Source Control Plan. Source (design and O&M assumptions) used for cost estimate is presented in Appendix C. Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc. FILE: 3089VTABLE 5-7. OOJ- Table 5-12R. Cost Comparison of Remedial Alternatives, TuTu Wells Site, St. Thomas, U.S. Virgin Islands. Remedial Alternative SRA 1 SRA 2 and SCPs SRA 3 and SCPs SRA 4 and SCPs SRA 5 and SCPs GRA 1 GRA 2 and SCPs GRA 3 and SCPs GRA 4 and SCPs Capital Cost §15,000 $311,000 $1,533,000 $1,502,000 $2,035,000 $15,000 $2,366,000 $2,537,000 $3,175,000 Present Worth O&M NA $423,000 $2,532,000 $2,503,000 $2,439,000 $1,757,000 $7,793,000 $6,143,000 $7,328,000 Total Cost $15,000 $734,000 $4,065,000 $4,005,000 $4,474,000 $1,772,000 $10,159,000 $8,680,000 $10,503,000 SRA Soil Remedial Alternative. SCPs Source Control Plans for the Texaco and Esso properties. GRA Groundwater Remedial Alternative. O&M Operations and Maintenance. FILE: 3089\TABLE512 Tutu Wellfield Site FS Addendum Revised 2/96 By de maximis, inc.