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• <br /> 3. SUMMARY OF SITE ASSESSMENT ACTIVITIES <br /> Petroleum hydrocarbon impact has been identified in the soil and groundwater beneath the <br /> Apache Plastics site and former Sunland service station to the north. The following sections <br /> provide individual summaries of available data regarding assessment activities conducted to date <br /> at each site. Approximate locations of former USTs, soil borings, and wells are included on <br /> Figure 2. <br /> 3.1 Former Apache Plastics Facility <br /> In 1976, Apache Plastics installed a 1,000-gallon underground storage tank (UST) beneath the <br /> sidewalk along the northern property boundary. The UST was used to store gasoline. <br /> Assessment of petroleum hydrocarbon impact was initiated in August 1989. Several consultants <br /> have been involved in characterizing petroleum hydrocarbon impact at this site. To date, a total <br /> of twelve groundwater monitoring wells and four soil vapor wells have been installed, and <br /> thirteen exploratory soil borings have been advanced at this site. <br /> i • Western Geologic Resources (WGR) installed groundwater monitoring wells MW-1 <br /> through MW-4 between August 28 and September 26, 1989. The wells were installed to <br /> depths between 65 and 68.5 feet below ground surface(bgs). <br /> • WGR installed groundwater monitoring wells MW-5 through MW-7 between June 8 and <br /> 12, 1990, to depths between 69 and 70 feet bgs. <br /> • BSK and Associates (BSK) installed soil vapor wells VEW-1, MP-1, and MP-2 between <br /> October 28 and 31, 1991. These wells were installed as cluster wells, with each well <br /> having separate screened intervals at approximately 30 to 32 feet bgs, and between 59 and <br /> 65 feet bgs. <br /> Remediation Services, Inc. (RSI) conducted a soil vapor Extraction pilot test utilizing <br /> wells VEW-1, MP-1, and MP-2 on between December 17 and 19, 1991. Extracting soil <br /> vapors from well VEW-1, RSI achieved an effective radius of influence of approximately <br /> 25 to 30 feet. <br /> • The UST and associated product pip ing-were removed on August 11, 1992. <br /> • BSK properly destroyed monitoring well MW-1 on May 4, 1992. <br /> p:Apache Plastics\Repons\Apache SCM.doc Page 4 ✓r'tratua <br />