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� 3 16 S WEISS ASSOCIATES Gordon Boggs / 10 lune 1988 / Page 7 3) In- i V l iliz ioq In-situ volatilization occurs by mechanically forcing or drawing air through the soil matrix to remove volatile compounds from the affected soil. This remedial technique is most effective in treating highly volatile compounds in permeable soils. Since the soil at the site contains relatively non-volatile diesel fuel, and the soil adjacent to tite excavation is low-permeability clay, this remedial option would not be very effective at this site. In-situ volntilization also has substantial desig*t, equipment, operation and monitoring requirements. q) Passive_R li i n Passive remediation involves no action at the site and relies on the natural processes of biodegradation, volatilization, leaching, and adsorption to degrade the compounds in the soil. This option is very inexpensive but is probably not acceptable to the regulatory agencies. 6, POSSIBLE IMPACTS FROM LEAVING THE SLAB IN-PLACE Leaving the slab in place should not adversely affect any of the 7otentiat remedial options for soil described above, since, as described in our correspondcrce dated 30 March 1988, no soil containing high hydrocarbon concentrations is covered by the slab. Leaving the slab in place should not adversely affect possible ground water remediation either. if, for ground water clean-up, an extraction well is needed within the boundaries of the concrete slab at the bottom of the excavation, a drilling technique capable of penetrating the concrete will be used for the well installation. Drilling techniques which should penetrate the concrete include air and mud rotary, and percussion drilling.