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a <br /> WEISS ASSOCIATES V <br /> 1 q, <br /> Gordon Boggs / 10 June 1988 / Page 7 <br /> 3) ln�situ Volatilization <br /> In-situ volatilization occurs by mechanically forcing or drawing air through the soil <br /> matrix to remove volatile compounds from the affected soil. This remedial technique is <br /> most effective in treating highly volatile compounds in permeable soils. Since the soil at <br /> the site contains relatively non-volatile diesel fuel, and the soil adjacent to the excavation <br /> is low-permeability clay, this remedial option would not be very effective at this site. <br /> In-situ volatilization also has substantial design, equipment, operation and monitoring <br /> requirements. <br /> 4) Passive Remcdialir�rz - <br /> Passive remediation involves no action at the site and relies on the natural processes <br /> r-; <br /> df biodegradation, volatilization, leaching, and adsorption to degrade the compounds in <br /> the soil. This option is very inexpensive but is probably not acceptable to the regulatory <br /> agencies. <br /> 6. POSSIBLE IMPACTS FROM LEAVING THE SLAB IN-PLACE <br /> Leaving the slab in place should not adversely affect any of the potential remedial <br /> options for soil described above, since, as described in our correspondence dated 30 March <br /> 1988, no soil containing high hydrocarbon concentrations i� covered by the slab. <br /> Leaving the slab in place should not adversely affect possible ground water <br /> remediation either. If, for ground water clean-up, ah t.titib�.tivu well i5 iiccJcJ within Clic <br /> boundaries of the concrete slab at the bottom of the excavation, a drilling technique <br /> capable of penetrating the concrete will be used for the well installation, Drilling <br /> techniques which should penetrate the concrete include air and mud rotary, and <br /> Percussion drilling. <br /> I <br /> li <br /> I <br />