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i i ■ On-site hybrid thermal/biological treatment and disposal ether on-site ior off-site For each method, estimated area requirements, time frame, and costs for 250, 500 and 750 cubic yards of soiI have been developed to show the sensitivity to scale 2 3 1 Transportation and Off-Site Treatment and Disposal Off-site treatment and disposal of petroleum impacted soils has been widely practiced and several options are available to the Stockton area Companies that can accept soil containing more than 1,000 mg/kg of hydrocarbons include Forward Inc of Stockton and Port Costa Materials of Concord Both of these firms have specific requirements for receiving, treating and final disposal of soil On the average, treatment and disposal ' costs are Soil Volume, cubic yards 250 500 750 Item i Sampling and Analysis $2,200 $3000 $4,400 Transportation to Disposal Co 2,000 3,000 4,000 Disposal Cost 15.000 30.000 45,000 Total 19,200 36,000 53,400 $/cubic yard 77 72 71 For both of the companies surveyed, hydrocarbons are destroyed during treatment so as to render the soil no longer hazardous (with respect to hydrocarbons) Since the soil would be removed from the site, neither space requirements nor treatment time are an issue Use of this approach ' is not impacted by rainy weather or other environmental factors As a result, off-site treatment and disposal can be considered completely effective i2 3 2 On-Site Bioremediation with Off-Site Disposal ' On-site bioremediation of soils containing diesel fuel constituents has also been widely practiced A brief workplan using this technology was prepared for the subject site in 1989, (EMCON Associates, January 1989) ' To meet current regulatory requirements, however, substantial improvements would be required in the design and implementation of this . process ' 2-4 ' COMPANY CONFIDENTIAL TRADE SECRET AND PROPRIETARY INFORMATION OF THE MARK GROUP LN111 ra