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After characterizing the soil to be treated and conducting bench scale testing, a treatment enclosure must be constructed as generally illustrated in Drawing 2-2 The enclosure consists of a soil berm approximately 30 inches high, lined with 40-mil high-density polyethylene liner When operation in wet weather is anticipated, the enclosure should be sloped approximately 1% so that rain water can be collected and disposed or recycled iFor the soil volumes to be considered, approximate enclosure areas inside the liner are Soil Volume, cubic yards 250 500 750 Lined Area, square feet 8,500 16,000 23,040 ' After constructing the enclosure, leachate collection piping is installed on the low end and a layer of sand approximately six inches thick is spread over the entire area A 12 inch deep layer of soil is then placed over the tsand When placing the soil, inorganic nutrients and water are added For soil containing gasoline constituents, soil placement may be limited to 50 to 100 cubic yards per week, due to uncontrolled volatile organic iemissions • For the remainder of the treatment period, the soil must be aerated, usually by tilling Water is added to maintain soil moisture at 50% of saturation In addition, the soil is sampled and analyzed for TPH, nutrients, moisture and microbial count every two to four weeks with ' typically one sample for every 50 cubic yards at first, every 100 cubic yards after the first month Since the proposed project would take place during winter weather, low ambient temperatures are expected to slow the rate of microbial action on hydrocarbons As a result, treatment time is estimated to be six to twelve weeks after initial soil placement To ensure that soil can be disposed at a wide range of facilities, treated soil concentration of TPH must be below 100 mg/kg, preferably below 10 mg/kg After treatment goals have been met, the soil, sand, and liner are removed and disposed For the sake of this comparison, we have assumed disposal at a Class III landfill • ' 2-5 COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP Hir