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For off-site thermal treatment, the estimated costs are as <br /> follows: <br /> Excavation, Backfill & Reasphalt $ 120, 000 <br /> Incineration ($1000/ton) 11, 000, 000 <br /> Transport ($400/ton) 4 , 400, 000 <br /> Misc. 35,000 <br /> $15, 555, 000 <br /> Contingency (20%) 3 , 111. 000 <br /> Total Estimate $18, 666, 000 <br /> 7 .2 .3 . Groundwater Extraction/Treatment <br /> When petroleum products that leak from underground storage tanks <br /> impact underlying groundwater, the remedial action chosen for <br /> that site typically require measures designed to cleanup the <br /> affected groundwater as well as the impacted soils. This section <br /> addresses those remedial actions associated with groundwater <br /> extraction and treatment. <br /> Groundwater extraction and treatment as a remedial action must <br /> address two primary issues. The first issue is the proper design <br /> of the extraction well network (in some cases in3ection well <br /> systems in conjunction with extraction wells are appropriate) . <br /> The second issue is the selection of the proper treatment method <br /> for the extracted groundwater. <br /> The first issue can be addressed by determining the following <br /> site--specific factors, which are prerequisites for adequately <br /> designing an optimum extraction and possibly extraction-injection <br /> well system: <br /> o Hydrogeologic characteristics (permeability, transmissivity, <br /> thickness of aquifer, depth of affected groundwater) will <br /> determine the depth, size, pumping capacities and other <br /> design requirements of potential extraction and infection <br /> wells. <br /> o Temporal water table level fluctuations, groundwater flow <br /> paths and gradients also are important for the proper design <br /> of well locations. <br /> In addition to designing an optimum well network, the second <br /> issue is the selection of the proper treatment technology for the <br /> extracted groundwater. Several technologies are available. The <br /> appropriate treatment technique is chosen based on site-specific <br /> and chemical-specific factors, as well as ultimate levels of <br /> treatment required or desired. All groundwater technologies <br /> share the need for an extraction well network to deliver ground- <br /> water to the treatment facility. <br /> 17 - <br />