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HomeMy WebLinkAbout2019.12.31_CCO.p16_ChemoursCorrectiveActionPlan-AppendixI TR0795 December 2019 APPENDIX I Detailed Costs Rough Order of Magnitude Cost Estimate for Treatment at Old Outfall 002 without Iron RemovalChemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions): Direct Discharge-750 gpm without Iron Removal, No Pre-Fab Building Scaled costs used from 1000 gpm (Using six-tenths rule of cost estimation) Item Qty Unit Unit Cost Total Notes Construction Costs Influent & Effluent Handling 108,000$ 108,000$ Multi Media Filtration 331,000$ 331,000$ Granular Activated Carbon 1,239,000$ 1,239,000$ Solids Handling and Chemical Precipitation 1,074,000$ 1,074,000$ Prefabricated Building & Containment Structure -$ -$ Land Costs -$ -$ Raw Construction  Costs 2,752,000$ Installation Cost (Construction, Site Preparation, Civil, Structural)60% of Raw Construction Costs 1,700,000$ Anciliary Cost (I&C, Piping‐Mechanical & Electrical) 40% of Sum of Raw Construction Costs and Installation Cost 1,800,000$ Total Construction Cost Sum  of Raw Construction Costs, Installation Cost and Anciliary Cost 6,300,000$ Professional Services Costs Engineering and Project Management 12%of Total Construction Cost 800,000$ Construction Management, Project Management, General Conditions 8%of Sum of Total Construction Cost, Engineering/PM & Contingency Costs 800,000$ Professional Services Subtotal 1,600,000$ Contingency 30%of Sum of Total Construction Cost and Engineering/PM cost 2,200,000$ C0,Construction Cost 10,100,000$               +50%15,150,000$               ‐30%7,070,000$                 Annual Operations & Maintenance Costs  Electricity 26,680$ 26,680$ GAC Usage & Replacement 552,000$ 552,000$ Chemicals for treatment (Acid, Caustic, Ferric, Polymer)27,000$ 27,000$ Solids Disposal 25,000$ 25,000$ Sampling & Analytical 53,000$ 53,000$ Operational Labor 450,000$ 450,000$ Equipment Maintenance 237,000$ 237,000$ Annual O&M Subtotal 1,400,000$ C,Annual Cost 1,400,000$                 +50%2,100,000$ ‐30%980,000$ n,Years 20 r,Discount Rate 3.5% Present Worth Formula Total: Present Worth Value of  Construction & Annual O&M Costs over 20  Years 30,000,000$               +50%45,000,000$ ‐30%21,000,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at the  time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive variable  factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐remedial  alternative comparison. Process Package Process Package Process Package Process Package Process Package Package Page 1 of 1 December 2019 Rough Order of Magnitude Cost Estimate for Interim Seep Remedies: Flow Through Cells (Seeps A-C) and French Drain (Seep D)Chemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions): IM:  Seeps A, B, and C Flow Through Structures, and Seep D French Drain capture See supporting document for treatment scenario, assumptions, and drawing Item Qty Unit Unit Cost Total Notes Construction Costs Flow Through Cells A‐C Road Installation Along River 1 Lump 500,000$ 500,000$ Clearing, Grubbing, and Seep Access 3 Seep 10,000$ 30,000$ Sheet Pile Installation 1,350 ft2 40$ 54,000$ Gabion Baskets and Frame (1 frame and 3 baskets per seep)3 Seep 6,200$ 18,600$ First Install GAC Seep A 3,742 Pound 1.50$ 5,613$ First Install GAC Seep B 3,742 Pound 1.50$ 5,613$ First Install GAC Seep C 3,742 Pound 1.50$ 5,613$ French Drain D Pipeline and Power Installation Along River 2,000 linear ft 29$ 58,000$ Lift Station at south end 1 lump 25,000$ 25,000$ Clearing, Grubbing, and Seep Access 1 Seep 10,000$ 10,000$ French Drain Installation 360 ft2 42$ 15,120$ Sump Pump Installation 1 Seep 2,980$ 2,980$ Feeder Electrical and discharge Line Seep D 910 linear ft 29$ 26,390$ Raw Construction  Costs 756,930$ Total Construction Cost Sum  of Raw Construction Costs, Installation Cost and Anciliary Cost 800,000$ Professional Services Costs Engineering and Project Management 12%of Total Construction Cost 100,000$ Construction Management, Project Management, General Conditions 18%of Sum of Total Construction Cost, Engineering/PM & Contingency Costs 220,000$ Professional Services Subtotal 320,000$ Contingency 30%of Sum of Total Construction Cost and Engineering/PM cost 270,000$ C0,Construction Cost 1,400,000$                 +50%2,100,000$                 ‐30%980,000$                    Page 1 of 2 December 2019 Rough Order of Magnitude Cost Estimate for Interim Seep Remedies: Flow Through Cells (Seeps A-C) and French Drain (Seep D)Chemours Fayetteville Works, North Carolina Annual Operations & Maintenance Costs  Flow Through Cells A‐C GAC Usage & Replacement 82,328 pound 1.50$ 123,493$ GAC Changeout Equipment and Labor 12 event 3,200.00$ 38,400$ Brush clearing and Path Maintenance 12 monthly 2,500$ 30,000$ Solids Disposal 4 event 640$ 2,560$ Sampling & Analytical (monthly performance sampling)12 month 14,800$ 177,600$ Operational Labor 4 event 7,500$ 30,000$ Equipment Maintenance 1 event 5,000$ 5,000$ Road Maintenance 1 event 5,000$ 5,000$ Storm Damage Repair and Gabion Replacement 1 event 18,600$ 18,600$ Annual Data Management and Performance Reporting 1 event 35,000$ 35,000$ French Drain D Electrical Power 1 lump 2,500.00$ 2,500$ GAC Usage & Replacement 10,000 pound 1.50$ 15,000$ Brush clearing and Path Maintenance 12 monthly 500$ 6,000$ Solids Disposal 12 event 240$ 2,880$ Sampling & Analytical (monthly performance sampling)12 month 4,000$ 48,000$ Operational Labor 12 event 1,500$ 18,000$ Equipment Maintenance 1 event 3,000$ 3,000$ Road, Pipe, and Power Maintenance 1 event 5,000$ 5,000$ Storm Damage Repair and Pump Replacement 1 event 10,000$ 10,000$ Annual O&M Subtotal 580,000$ C,Annual Cost 600,000$   +50%870,000$ ‐30%406,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at  the time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive  variable factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐ remedial alternative comparison. Page 2 of 2 December 2019 Rough Order of Magnitude Cost Estimate for Low Range Permanent Seep Remedy: Flow Through Cells (Seeps A-C) and French Drain (Seep D)Chemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions): IM:  Seeps A, B, and C Flow Through Structures, and Seep D French Drain capture See supporting document for treatment scenario, assumptions, and drawing Item Qty Unit Unit Cost Total Notes Construction Costs Flow Through Cells A‐C Road Installation Along River 1Lump 500,000$ 500,000$ Clearing, Grubbing, and Seep Access 3 Seep 10,000$ 30,000$ Sheet Pile Installation 1,350 ft2 40$ 54,000$ Gabion Baskets and Frame (1 frame and 3 baskets per seep)3 Seep 6,200$ 18,600$ First Install GAC Seep A 3,742 Pound 1.50$ 5,613$ First Install GAC Seep B 3,742 Pound 1.50$ 5,613$ First Install GAC Seep C 3,742 Pound 1.50$ 5,613$ French Drain D Pipeline and Power Installation Along River 2,000 linear ft 29$ 58,000$ Lift Station at south end 1lump 25,000$ 25,000$ Clearing, Grubbing, and Seep Access 1 Seep 10,000$ 10,000$ French Drain Installation 360 ft2 42$ 15,120$ Sump Pump Installation 1 Seep 2,980$ 2,980$ Feeder Electrical and discharge Line Seep D 910 linear ft 29$ 26,390$ Raw Construction  Costs 756,930$ Total Construction Cost Sum  of Raw Construction Costs, Installation Cost and Anciliary Cost 800,000$ Professional Services Costs Engineering and Project Management 12%of Total Construction Cost 100,000$ Construction Management, Project Management, General Conditions 18%of Sum of Total Construction Cost, Engineering/PM & Contingency Costs 220,000$ Professional Services Subtotal 320,000$ Contingency 30%of Sum of Total Construction Cost and Engineering/PM cost 270,000$ C0,Construction Cost 1,400,000$                 +50%2,100,000$                 ‐30%980,000$                    Page 1 of 2 December 2019 Rough Order of Magnitude Cost Estimate for Low Range Permanent Seep Remedy: Flow Through Cells (Seeps A-C) and French Drain (Seep D)Chemours Fayetteville Works, North Carolina Annual Operations & Maintenance Costs  Flow Through Cells A‐C GAC Usage & Replacement 82,328 pound 1.50$ 123,493$ GAC Changeout Equipment and Labor 12 event 3,200.00$ 38,400$ Brush clearing and Path Maintenance 12 monthly 2,500$ 30,000$ Solids Disposal 4event 640$ 2,560$ Sampling & Analytical (monthly performance sampling)12 month 14,800$ 177,600$ Operational Labor 4 event 7,500$ 30,000$ Equipment Maintenance 1 event 5,000$ 5,000$ Road Maintenance 1 event 5,000$ 5,000$ Storm Damage Repair and Gabion Replacement 1 event 18,600$ 18,600$ Annual Data Management and Performance Reporting 1 event 35,000$ 35,000$ French Drain D Electrical Power 1lump 2,500.00$ 2,500$ GAC Usage & Replacement 10,000 pound 1.50$ 15,000$ Brush clearing and Path Maintenance 12 monthly 500$ 6,000$ Solids Disposal 12 event 240$ 2,880$ Sampling & Analytical (monthly performance sampling)12 month 4,000$ 48,000$ Operational Labor 12 event 1,500$ 18,000$ Equipment Maintenance 1 event 3,000$ 3,000$ Road, Pipe, and Power Maintenance 1 event 5,000$ 5,000$ Storm Damage Repair and Pump Replacement 1 event 10,000$ 10,000$ Annual O&M Subtotal 580,000$ C,Annual Cost 600,000$   +50%870,000$ ‐30%406,000$ n,Years 20 r,Discount Rate 3.5% Present Worth Formula Total: Present Worth Value of  Construction & Annual O&M Costs over 20  Years 9,000,000$                 +50%13,500,000$ ‐30%6,300,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at  the time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive  variable factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐ remedial alternative comparison. Page 2 of 2 December 2019 Rough Order of Magnitude Cost Estimate for High Range Permanent Seep Remedy: Ex Situ Capture using French Drains at All SeepsChemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions): Seeps A, B, C, and D Capture and Treat using French Drains. Would require dismantling flow through cells at Seeps A‐C See supporting document for treatment scenario, assumptions, and drawing Item Qty Unit Unit Cost Total Notes Construction Costs Deconstruction of Flow Through Cells at Seeps A‐C 1lump 100,000$ 100,000$ Treatment Plant Expansion to Handle Additional 300 gpm Flow 1lump 6,800,000$ 6,800,000$ Pipeline and Power Installation Along River 5,900 linear ft 29$ 171,100$ Lift Station at south end 1lump 25,000$ 25,000$ Clearing, Grubbing, and Seep Access 3 Seep 10,000$ 30,000$ French Drain Installation 1,080 ft2 42$ 45,360$ Sump Pump Installation 3 Seep 2,980$ 8,940$ Feeder Electrical and discharge Line Seep A 800 linear ft 29$ 23,200$ Feeder Electrical and discharge Line Seep B 720 linear ft 29$ 20,880$ Feeder Electrical and discharge Line Seep C 670 linear ft 29$ 19,430$ Raw Construction  Costs 7,243,910$ Total Construction Cost Sum  of Raw Construction Costs, Installation Cost and Anciliary Cost 7,300,000$ Professional Services Costs Engineering and Project Management 12%of Total Construction Cost 900,000$ Construction Management, Project Management, General Conditions 18%of Sum of Total Construction Cost, Engineering/PM & Contingency Costs 2,000,000$ Professional Services Subtotal 2,900,000$ Contingency 30%of Sum of Total Construction Cost and Engineering/PM cost 2,500,000$ C0,Construction Cost 12,700,000$               +50%19,050,000$               ‐30%8,890,000$                 Annual Operations & Maintenance Costs  Electrical Power 1lump 25,000.00$ 25,000$ GAC Usage & Replacement 90,000 pound 1.50$ 135,000$ Brush clearing and Path Maintenance 12 monthly 2,500$ 30,000$ Solids Disposal 12 event 320$ 3,840$ Sampling & Analytical (monthly performance sampling)12 month 17,200$ 206,400$ Operational Labor 12 event 7,500$ 90,000$ Equipment Maintenance 1 event 11,900$ 11,900$ Road, Pipe, and Power Maintenance 1 event 35,000$ 35,000$ Storm Damage Repair and Pump Replacement 1 event 21,920$ 21,920$ Annual O&M Subtotal 560,000$ Annual Cost 560,000$                    +50%840,000$ ‐30%392,000$ n,Years 20 r,Discount Rate 3.5% Present Worth Formula Total: Present Worth Value of  Construction & Annual O&M Costs over 20  Years 21,000,000$               +50%31,500,000$ ‐30%14,700,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at  the time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive  variable factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐ remedial alternative comparison. Page 1 of 1 December 2019 Rough Order of Magnitude Cost Estimate for Interim Groundwater Extraction from Existing Black Creek Monitoring WellsChemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions): Extract GW from seven existing black creek monitoring wells for treatment ‐ BCA‐01, PW‐15R, PW‐14, BCA‐02, PIW‐09D, PW‐10DR, PW‐11 ‐ Assumes OOF2 Treatment Plant has excess capacity ‐ No NPDES permitting required (covered by OOF2) ‐ Assumes 2 gpm per well (14 gpm total) Item Qty Unit Unit Cost Total Notes Construction Costs Clearing and Grubbing 1 Acre 10,000$ 10,000$ Subsurface Trenching/Piping ‐ 0.5‐inch (Installed)850 Feet 22$ 18,700$ Subsurface Trenching/Piping ‐ 1‐inch (Installed)3950 Feet 24$ 94,800$ Subsurface Trenching/Piping ‐ 2‐inch (Installed)1900 Feet 29$ 55,100$ Subsurface Trenching Conduit (Installed)6700 Feet 6$ 40,200$ Sumbersible Pumps & Controls (Installed)7EA 10,000$ 70,000$ Valve Boxes/Vaults 7EA 3,000$ 3,000$ Total Construction Cost 291,800$ Professional Services Costs Engineering and Project Management 12%of Total Construction Cost 100,000$ Construction Management, Project Management, General Conditions 18%of Sum of Total Construction Cost, Engineering/PM & Contingency Costs 200,000$ Professional Services Subtotal 300,000$ Contingency 30%of Sum of Total Construction Cost and Engineering/PM cost 200,000$ C0,Construction Cost 800,000$                     +50%1,200,000$                 ‐30%560,000$                     Annual Operations & Maintenance Costs  Electricity LS 5,000$ 5,000$ Operational Labor LS 58,240$ 58,240$ Equipment Maintenance LS 5,000$ 5,000$ -$ -$ -$ -$ Annual O&M Subtotal 68,240$ C,Annual Cost 70,000$                       +50%102,000$ ‐30%48,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at  the time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive  variable factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐ remedial alternative comparison. December 2019 Rough Order of Magnitude Cost Estimate for Onsite Barrier Wall and Groundwater Capture (Low Range Scenario) Chemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions) for Low Range Onsite Groundwater Remedy: Dewind one‐pass slurry wall to cut off groundwater‐surface water interface, with hydraulic containment behind the wall and ex‐situ treatment.  Total impacted riverine length is 8,500 linear feet. Geotechnical predesign investigation every 100 feet. Average depth of barrier wall to key into the Upper Cape Fear Confining Unit is 50 feet. Based on numerical model drawdown scenarios, extraction wells will be spaced 200 feet apart and pumping rates will range from 20 to 30 gpm. A total of 41 wells and 930 gpm (1.3 MGD) would be required for hydraulic containment. The average PMPA and PFMOAA concentration of the extracted groundwater is estimated to be 8,200 and 150,000 ng/L, respectively. Wells will convey groundwater under pressure to the new standalone system, with basic heat tracing (no prefabricated building). Piping will be HDPE and trenches will be approximately 3 feet deep, and reuse of excacated soils as backfill will be permitted. HDPE pipe sizes range from 2 to 18 inch diameter SDR 11. Treated groundwater will be discharged to the Cape Fear river. Includes a 20‐year net present value cost with a 3.5% discount factor applied. Parameters that were estimated using RACER v 11.2.16.0 are identified below, and are fully marked‐up costs. Item Qty Unit Unit Cost Total Notes Construction Costs Barrier Wall Geotechnical predesign investigation 4,250 LF 100$ 425,000$                     Engineer's Estimate Contractor mob and demob 1LS 100,000$ 100,000$                     Dewind Site clearing and prep (veg clearing, grading, E&S)8 ACRE 100,000$ 780,533$                     Engineer's Estimate Utility location (for steel barrier and well locations)1LS 10,000$ 10,000$                        Engineer's Estimate Slurry wall installation and key trench 425,000 SF 9.30$ 3,952,500$                  Dewind Site restoration and revegetation 8 ACRE 50,000$ 390,266$                     Engineer's Estimate Sheet Piling Subtotal 5,658,299$                  Drilling Costs Driller mobilization 1LS 10,000$ 10,000$                        Engineer's Estimate Extraction Wells drilling and well installation (no appurtenances)2,050 LF 225$ 461,250$                     Engineer's Estimate Aquifer pump testing on 25% of extraction wells 10 EA 15,000$ 153,750$                     Engineer's Estimate Monitoring Wells drilling and installation 683 LF 75$ 51,250$                        Engineer's Estimate IDW 2,733 LF 10$ 27,333$                        Engineer's Estimate Drilling Subtotal 703,583$                     Site Work Costs HDPE SDR 11 ‐ 2"200 LF 1.35$ 270$                             Engineer's Estimate HDPE SDR 11 ‐ 3"200 LF 2.35$ 470$                             Engineer's Estimate HDPE SDR 11 ‐ 4"500 LF 3.90$ 1,949$                          Engineer's Estimate HDPE SDR 11 ‐ 6"700 LF 8.43$ 5,898$                          Engineer's Estimate HDPE SDR 11 ‐ 8"1,000 LF 14.28$ 14,280$                        Engineer's Estimate HDPE SDR 11 ‐ 10"1,000 LF 22.18$ 22,178$                        Engineer's Estimate HDPE SDR 11 ‐ 12"700 LF 31.20$ 21,840$                        Engineer's Estimate HDPE SDR 11 ‐ 14"1,500 LF 37.61$ 56,422$                        Engineer's Estimate HDPE SDR 11 ‐ 16"1,500 LF 49.07$ 73,612$                        Engineer's Estimate HDPE SDR 11 ‐ 18"1,200 LF 62.17$ 74,609$                        Engineer's Estimate HDPE fusing and fittings 1LS 2,000.00$ 2,000$                          Engineer's Estimate 3'x3'x3' Well Vault + H20‐Rated Lid (4.5x4.5x4.5)41 ea 12,993.00$ 532,713$                     Engineer's Estimate Flow Meters, Level and Pressure Transmitters 41 ea 1,603.00$ 65,723$                        Engineer's Estimate Grundfos 3" 15SQ05‐110‐240V Submersible Pump, fittings, appurtenances 41 ea 2,190.58$ 89,814$                        Engineer's Estimate Power poles, hardware, guy wires, excavation, wiring, transformers 8ea 30,639.71$ 245,118$                     Engineer's Estimate Local control panels 41 ea 5,000.00$ 205,000$                     Engineer's Estimate Utility Connection to System 1ea 120,000.00$ 120,000$                     Engineer's Estimate Subcontractor Installation Costs‐Piping 2"‐6"1,600 LF 75.00$ 120,000$                     Engineer's Estimate Subcontractor Installation Costs‐Piping 8"‐14"4,200 LF 100.00$ 420,000$                     Engineer's Estimate Subcontractor Installation Costs‐Piping 16"‐18"2,700 LF 125.00$ 337,500$                     Engineer's Estimate Subcontractor Installation Costs‐Well Vault 41 ea 5,000.00$ 205,000$                     Engineer's Estimate Subcontractor Installation Costs‐Electrical 1LS 270,000.00$ 270,000$                     Engineer's Estimate Subcontractor mobilization 5%of 2,884,395$ 144,220$ Engineer's Estimate Site Work Subtotal 3,028,615$                  Page 1 of 2 December 2019 Rough Order of Magnitude Cost Estimate for Onsite Barrier Wall and Groundwater Capture (Low Range Scenario) Chemours Fayetteville Works, North Carolina 930 GPM (1.3 MGD) Treatment Plant Cost GW Pipeline 440,000$ 440,000$                     Parsons Influent & Effluent Handling, includes lift stations, EQ tanks, feed forward  pumps, discharge pumps 71,964$ 71,964$                        Parsons Multi Media Filtration, includes skids and backwash pumps 304,464$ 304,464$                     Parsons Granular Activated Carbon, includes skid, water suppy tank, backwash  waste tank, backwash pumps 1,245,536$ 1,245,536$                  Parsons Solids Handling and Chemical Precipitation, includes feed pumps, clarifiers,  sludge pumps, filter press, chemicals 996,429$ 996,429$                     Parsons Enclosures and Heat Tracing 393,036$ 393,036$                     Parsons Installation Cost (Construction, Site Preparation, Civil, Structural)70% of 2,618,393$ 1,900,000$ Parsons Anciliary Cost (I&C, Piping‐Mechanical & Electrical)30% of $ 4,911,429 1,473,429$ Parsons 1.3 MGD Treatment Plant Subtotal 6,824,857$ Total Construction Costs 16,215,355$ Professional Services Costs Modeling, Design, Work Planning, and Permitting 10%of 16,215,355$ 1,621,535$                  adapted from EPA Guidance Construction Oversight 10%of 16,215,355$ 1,621,535$ adapted from EPA Guidance Project Management 8%of 16,215,355$ 1,297,228$ adapted from EPA Guidance Professional Services Subtotal 4,540,299$ Contingency 30%of 20,755,654$ 6,226,696$ Construction Cost 27,000,000$               +50%40,500,000$                ‐30%18,900,000$                Annual Operations & Maintenance Costs  Electricity ‐ Field Equipment 1LS 53,000$ 53,000$ Engineer's Estimate Electricity ‐ Treatment Systems 1LS 21,589$ 21,589$ Parsons GAC Usage & Replacement 1LS 808,214$ 808,214$ Parsons Chemicals for treatment (Acid, Caustic, Ferric, Polymer)1LS 24,357$ 24,357$ Parsons Solids Disposal 1LS 22,696$ 22,696$ Parsons Sampling & Analytical 1LS 48,714$ 48,714$ Parsons Operational Labor 1LS 470,536$ 470,536$ Parsons Equipment Maintenance 1LS 221,429$ 221,429$ Parsons Annual O&M Subtotal 1,670,536$ Annual Cost 1,700,000$                  +50%2,505,804$ ‐30%1,169,375$ Years 20 Discount Rate 3.5% Net Present Value (NPV) of Annual Costs over 20 Years 24,000,000$               +50%36,000,000$ ‐30%16,800,000$ Total Cost ‐ Construction and Annual O&M Total: Construction + NPV of Annual Costs over 20 Years 51,000,000$               +50%76,500,000$ ‐30%35,700,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at the  time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive variable  factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐remedial  alternative comparison. Process Package Process Package Process Package Process Package Process Package Process Package Page 2 of 2 December 2019 Rough Order of Magnitude Cost Estimate for Onsite Barrier Wall and Groundwater Capture (High Range Scenario) Chemours Fayetteville Works, North Carolina Basis of Cost Estimate (Scope and Assumptions) for High Range Onsite Groundwater Remedy: Dewind one‐pass slurry wall to cut off groundwater‐surface water interface, with hydraulic containment behind the wall and ex‐situ treatment.  Total impacted riverine length is 8,500 linear feet. Average depth of barrier wall to key into the Upper Cape Fear Confining Unit is 50 feet. Based on numerical model drawdown scenarios, extraction wells will be spaced 200 feet apart and pumping rates will range from 20 to 30 gpm. A total of 41 wells and 930 gpm (1.3 MGD) would be required for hydraulic containment. The average PMPA and PFMOAA concentration of the extracted groundwater is estimated to be 8,200 and 150,000 ng/L, respectively. Wells will convey groundwater under pressure to the new standalone system, fully enclosed from the elements. Piping will be HDPE and trenches will be approximately 3 feet deep, and reuse of excacated soils as backfill will be permitted. HDPE pipe sizes range from 2 to 18 inch diameter SDR 11. Treated groundwater will be discharged to the Cape Fear river. Includes a 20‐year net present value cost with a 3.5% discount factor applied. Parameters that were estimated using RACER v 11.2.16.0 are identified below, and are fully marked‐up costs. Item Qty Unit Unit Cost Total Notes Construction Costs Sheet Piling Geotechnical predesign investigation 4,250 LF 100$ 425,000$                     Engineer's Estimate Contractor mob and demob 1LS 200,000$ 200,000$                     Sevenson Site clearing and prep (veg clearing, grading, pits, E&S)10 ACRE 30,000$ 292,700$                     Sevenson Utility location (for steel barrier and well locations)1LS 10,000$ 10,000$                        Engineer's Estimate Permanent steel sheet piling, 38 psf, furnish and install 425,000 SF 37$ 15,725,000$                RACER, Sevenson Site restoration and revegetation 10 ACRE 60,000$ 585,399$                     Engineer's Estimate Sheet Piling Subtotal 17,238,099$                Drilling Costs Driller mobilization 1LS 10,000$ 10,000$                        Engineer's Estimate Extraction Wells drilling and well installation (no appurtenances)2,050 LF 225$ 461,250$                     Engineer's Estimate Aquifer pump testing on 25% of extraction wells 10 EA 15,000$ 153,750$                     Engineer's Estimate Monitoring Wells drilling and installation 683 LF 75$ 51,250$                        Engineer's Estimate IDW 2,733 LF 10$ 27,333$                        Engineer's Estimate Drilling Subtotal 703,583$                     Site Work Costs HDPE SDR 11 ‐ 2"200 LF 1.35$ 270$                             Engineer's Estimate HDPE SDR 11 ‐ 3"200 LF 2.35$ 470$                             Engineer's Estimate HDPE SDR 11 ‐ 4"400 LF 3.90$ 1,559$                          Engineer's Estimate HDPE SDR 11 ‐ 6"600 LF 8.43$ 5,056$                          Engineer's Estimate HDPE SDR 11 ‐ 8"1,000 LF 14.28$ 14,280$                        Engineer's Estimate HDPE SDR 11 ‐ 10"1,000 LF 22.18$ 22,178$                        Engineer's Estimate HDPE SDR 11 ‐ 12"600 LF 31.20$ 18,720$                        Engineer's Estimate HDPE SDR 11 ‐ 14"1,400 LF 37.61$ 52,661$                        Engineer's Estimate HDPE SDR 11 ‐ 16"1,400 LF 49.07$ 68,704$                        Engineer's Estimate HDPE SDR 11 ‐ 18"1,700 LF 62.17$ 105,697$                     Engineer's Estimate HDPE fusing and fittings 1LS 2,000.00$ 2,000$                          Engineer's Estimate 3'x3'x3' Well Vault + H20‐Rated Lid (4.5x4.5x4.5)41 ea 12,993.00$ 532,713$                     Engineer's Estimate Flow Meters, Level and Pressure Transmitters 41 ea 1,603.00$ 65,723$                        Engineer's Estimate Grundfos 3" 15SQ05‐110‐240V Submersible Pump, fittings, appurtenances 41 ea 2,190.58$ 89,814$                        Engineer's Estimate Power poles, hardware, guy wires, excavation, wiring, transformers 8ea 30,639.71$ 245,118$                     Engineer's Estimate Local control panels 41 ea 5,000.00$ 205,000$                     Engineer's Estimate Utility Connection to System 1ea 120,000.00$ 120,000$                     Engineer's Estimate Subcontractor Installation Costs‐Piping 2"‐6"1,400 LF 75.00$ 105,000$                     Engineer's Estimate Subcontractor Installation Costs‐Piping 8"‐14"4,000 LF 100.00$ 400,000$                     Engineer's Estimate Subcontractor Installation Costs‐Piping 16"‐18"3,100 LF 125.00$ 387,500$                     Engineer's Estimate Subcontractor Installation Costs‐Well Vault 41 ea 5,000.00$ 205,000$                     Engineer's Estimate Subcontractor Installation Costs‐Electrical 1LS 270,000.00$ 270,000$                     Engineer's Estimate Subcontractor mobilization 5%of 2,917,461$ 145,873$ Engineer's Estimate Site Work Subtotal 3,063,334$                  Page 1 of 2 December 2019 Rough Order of Magnitude Cost Estimate for Onsite Barrier Wall and Groundwater Capture (High Range Scenario) Chemours Fayetteville Works, North Carolina 930 GPM (1.3 MGD) Treatment Plant Cost GW Pipeline 440,000$ 440,000$                     Parsons Influent & Effluent Handling, includes lift stations, EQ tanks, feed forward  pumps, discharge pumps 71,964.29$ 71,964$                        Parsons Multi Media Filtration, includes skids and backwash pumps 304,464.29$ 304,464$                     Parsons Granular Activated Carbon, includes skid, water suppy tank, backwash  waste tank, backwash pumps 1,245,535.71$ 1,245,536$                  Parsons Solids Handling and Chemical Precipitation, includes feed pumps, clarifiers,  sludge pumps, filter press, chemicals 996,428.57$ 996,429$                     Parsons Prefabricated Building & Containment Structure 3,487,500.00$ 3,487,500$                  Parsons Installation Cost (Construction, Site Preparation, Civil, Structural)70% of 2,618,393$ 1,900,000$ Parsons Anciliary Cost (I&C, Piping‐Mechanical & Electrical)30% of $ 4,518,393 1,400,000$ Parsons 1.3 MGD Treatment Plant Subtotal 9,845,893$ Total Construction Costs 30,850,910$ Professional Services Costs Modeling, Design, Work Planning, and Permitting 8%of 30,850,910$ 2,468,073$                  adapted from EPA Guidance Construction Oversight 8%of 30,850,910$ 2,468,073$ adapted from EPA Guidance Project Management 6%of 30,850,910$ 1,851,055$ adapted from EPA Guidance Professional Services Subtotal 6,787,200$ Contingency 30%of 37,638,110$ 11,291,433$ Construction Cost 49,000,000$               +50%73,500,000$                ‐30%34,300,000$                Annual Operations & Maintenance Costs  Electricity ‐ Field Equipment 1LS 53,000$ 53,000$ Engineer's Estimate Electricity ‐ Treatment Systems 1LS 21,589$ 21,589$ Parsons GAC Usage & Replacement 1LS 808,214$ 808,214$ Parsons Chemicals for treatment (Acid, Caustic, Ferric, Polymer)1LS 24,357$ 24,357$ Parsons Solids Disposal 1LS 22,696$ 22,696$ Parsons Sampling & Analytical 1LS 48,714$ 48,714$ Parsons Operational Labor 1LS 470,536$ 470,536$ Parsons Equipment Maintenance 1LS 221,429$ 221,429$ Parsons Annual O&M Subtotal 1,670,536$ Annual Cost 1,700,000$                  +50%2,505,804$ ‐30%1,169,375$ Years 20 Discount Rate 3.5% Net Present Value (NPV) of Annual Costs over 20 Years 24,000,000$               +50%36,000,000$ ‐30%16,800,000$ Total Cost ‐ Construction and Annual O&M Total: Construction + NPV of Annual Costs over 20 Years 73,000,000$               +50%109,500,000$ ‐30%51,100,000$ Costs are rough order of magnitude estimates, and assumed to represent the actual installed cost within a range of ‐30%/ +50% of the value  indicated above. The estimates have been prepared for guidance in project evaluation and implementation from the information available at the  time of the estimate. The final costs of the project will depend on final approved design, actual labor and material costs, and competitive variable  factors. These estimates are not intended for budgetary or future planning purposes; they have been prepared to facilitate an inter‐remedial  alternative comparison. Process Package Process Package Process Package Process Package Process Package Process Package Page 2 of 2 December 2019