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Geologccal Teclucccs Inc <br /> Page 7 <br /> George's Service <br /> Feasibility Study <br /> Project No 425 2 <br /> April 28,2004 <br /> GTI would propose starting with 20 infection wells and only adding additional wells if the <br /> ' radius of influence warrants the additions If 20 injection wells sufficiently cover the area <br /> the remediation costs would be proportionately reduced <br /> ' The goal of in situ infection is a 90% destruction rate leaving 10% bound to soil and <br /> dissolved in groundwater The end product of this remedial alternative is an environment <br /> enriched in oxygen non-toxic concentration of petroleum hydrocarbons, which will enhance <br /> attenuation by biodegradation to complete the remedial process Attenuation of this <br /> ' contamination will require additional monitoring and the costs associated with that work <br /> Costs related to monitoring will depend on the length of monitoring required and are not <br /> included at this time in the opinion of costs outlined above <br /> ' 3.2 Soil Excavation <br /> The following estimates are based on similar work at other sites A three bidding process <br /> ' will be used to determine actual costs upon approval of a Corrective Action Plan <br /> Description Estimated Costs <br /> ' Project Planning & Coordination $ 4,000 <br /> Excavation of 5,000 yd, (Labor, Equipment, Disposal, Clean Backfill) 325,000 <br /> Water Storage and Disposal (assuming 100,000 gallons produced) 85,000 <br /> Soil Analyses for disposal (four(4) composite samples) 500 <br /> Project Management & Supervision 5,000 <br /> Data Evaluation & Reporting 4,000 <br /> This does not include replacement of the asphalt for Durham Ferry Road, pennitting to <br /> excavate the road, traffic control during excavation and shoring of utilities These details <br /> ' would drive the cost beyond $500,000 00 Excavation is not a viable option for this site <br /> 3.3 Dual Phase Extraction <br /> ' Dual Phase Extraction is examined here rather than Soil Vapor Extraction because <br /> groundwater will be extracted from the site with either method due to the high groundwater <br /> elevation specific to the site <br /> ' The following estimates are based on similar work at other sites A three bidding process <br /> will be used to detennine actual costs upon approval of a Corrective Action Plan <br /> ' Description Estimated Cost <br /> DPE System (Mob/Demob/Start-up) $ 2,500 <br /> DPE System Purchase 40,000 <br /> ' DPE Enclosure and Manifold System 6,000 <br /> Three Phase Power Installation 5,000 <br /> Electricity 5,000* <br /> Propane 7,500* <br /> 5,000-gallon Baker Tank 1,500 <br /> Vapor Extraction Well Installation (4 VEWs) 13,500 <br /> ' Development of VEWs 1,000 <br />