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To implement this process, a treatment area is first covered with 6-mil plastic sheeting A bermed liner area is not necessary, since soil will be protected from rain during treatment and moisture levels will be well below saturation A shallow layer of soil is next added Above this soil base, a series of air inlet pipes is laid, coming in from both sides of the pile These pipes are slotted galvanized steel to permit distribution of hot air Above the air inlet pipes, a 30 inch deep layer of soil is placed This soil is placed in 10 inch lifts With each lift, inorganic fertilizer is spread Above this soil layer, a row of air extraction piping is assembled Air extraction piping is slotted plastic A 20 inch layer of soil is placed next in a manner as described above Above this soil layer, another row of extraction piping is placed and covered with 10 inches of soil This results in a treatment pile approximately sic feet high Since the treatment pile is much deeper, substantially less area is used than with conventional fbioremediation as follows Soil Volume, cubic yards 250 500 750 Treatment Area, square feet 1,500 3,000 4,500 As can be seen, the treatment area is approximately 20% of that required 1 for conventional bioremediation After the treatment pile is constructed, it is covered with plastic sheeting to hold in heat and prevent rainwater intrusion Since no rainwater contacts the treatment pile, runoff collection is not needed After the treatment pile is constructed and covered, the treatment module, ' illustrated in Drawing 2-4 is brought in and connected To begin the treatment process, hydrocarbon laden air is extracted from the pile and routed into a thermal combustor The hot gasses from the combustor ' are cooled in a heat exchanger and then discharged to the atmosphere In the combustor, essentially all (over 99 %) of the extracted hydrocarbons are destroyed, resulting in little or no emissions to the atmosphere Simultaneously, clean air is blown in through the heat exchanger and into the soil pile The introduction of heated air into the pile substantially speeds hydrocarbon volatilization, typically resulting in complete gasoline removal in as little as one week During this portion of the operating cycle, the extracted air will be monitored for hydrocarbon concentration After the hydrocarbon extraction rate from the pile has dropped significantly, bioremediation will be stimulated This will be accomplished by introducing moisture to the pile by humidifying the inlet air To do this, water will be sprayed into a humidification chamber downstream of the air heat exchanger By rearranging air inlet and extraction piping, moist air will be introduced into all areas of the soil pile This configuration will be used until treatment is completed 2-7 COMPANY CONFMEtMAL TRADE SECRET AND PROPRICrARY WPORMATION OF UM MARK GROUP mrs