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�F F <br /> AUG 2 r °^^1 <br /> DRAFT' REMEDIAL WORK PLAN ENVIRONMENTAL HEALTH <br /> APACHE PLASTICS L P PERMIT/SERVICES <br /> 2050 E FREMONT ST <br /> STOCKTON, CALIFORNIA <br /> Executive Summaa <br /> Apache Plastics, L.P. (AP) manufactures extruded plastic pipe at this facility, which is <br /> located in a mixed commercial district on the eastern side of Stockton, California. <br /> In August 1988, a 1000-gallon underground gasoline storage tank was removed from the <br /> north side of the AP budding. A soil sample collected from soil beneath the tank backfill <br /> material, at the time the tank was removed, contained 3400 ppm TPH and 61 ppm, 290 <br /> ppm, 610 ppm, and 65 ppm benzene, toluene, xylene and ethylbenzene, respectively. <br /> Subsequent subsurface investigations, performed by Western Geologic Resources, Inc. <br /> (WGR) in August and September 1989, and May and June 1990, consisted of drilling seven <br /> . soil borings and installation of groundwater monitoring wells (MW-1 through MW-7) to <br /> depths of 65 to 70 feet below ground surface. Analytical results of soil and groundwater <br /> samples reported in WGR's investigation reports indicated that soil beneath the former fuel <br /> tank and groundwater beneath the building has been impacted by petroleum hydrocarbon <br /> contamination. In addition to petroleum hydrocarbon contamination, groundwater samples <br /> from five of the monitor wells contained detectable concentrations of 1,2-DCA and one <br /> monitor well sample contained a detectable concentration of EDB. In June 1991, <br /> groundwater sampling was attempted by WGR but all seven wells were dry. <br /> Remediation of contaminated soil in the vicinity of the former fuel tank would minimize the <br /> potential for continued impact of TTH on the groundwater at the site. To accomplish <br /> cleanup of subsurface soil, Remediation Services, Inc would install an in-situ soil vapor <br /> extraction system in the vadose zone in the vicinity of the tank emplacement <br /> Prior to installation of the vapor extraction system, a pilot test would be scheduled for two <br /> to five days The purpose of the pilot test would be to obtain information needed for design <br /> of the well field and the air pollution control device for the long term system.. Data needed <br /> for design would include soil permeability and hydraulic conductivity of the soil surrounding <br /> the extraction wells, and mass loading of contaminants in the extracted soil gas. During the <br /> test, a two-stage carbon-canister system would be used for air pollution control. <br /> S 1 <br /> RE MEDIATION <br /> SERVICES INC <br />