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S EC ® R • QUARTERLY STATUS AND REMEDIATION SUMMARY REPORT Fourth Quarter 2005 Circle K Store #08671 8606 Thornton Road, Stockton, California City/County ID # Stockton County San Joaquin SITE SETTING The site is located at 8606 Thornton Road, Stockton, California The site is currently an operating gasoline service station that contains two gasoline USTs, associated product lines, and dispensers PREVIOUS ASSESSMENT In May 1998, product lines and dispensers were upgraded to meet 1998 EPA standards Analytical results from pea gravel samples collected from above the USTs and soil samples collected from the former product line and dispenser excavations indicated the presence of petroleum hydrocarbons in soil beneath the site The results of this work are documented in SECOR's report titled Removal and Replacement of Product Lines and Dispensers, dated July 22, 1998 During product line and dispenser upgrade activities, approximately 21 tons of petroleum-impacted soil were over-excavated from the site and disposed of at Forward Landfill On January 27 and 28, 1999, four groundwater monitoring wells (MW-1 through MW-4) were installed onsite by SECOR The results of this work are documented in SECOR's report titled Well Installation Report, dated March 16, 1999 Since their installation, the four wells have been monitored and sampled quarterly On December 12th through 14th, 2001, one deep soil boring (SB-1) was drilled to an approximate depth of 63 feet below ground surface (bgs) and three additional groundwater monitoring wells (MW-5, MW-6, and MW-7) were installed onsite by SECOR The results of this work are documented in SECOR's report titled Site Assessment Report, dated June 21, 2002 In November 2003, SECOR installed deep well MW-8, MW-9, and MW-10 at the site Petroleum hydrocarbons were not reported in soil and groundwater samples form the new wells Vertical and lateral delineation of the plume has been completed On April 25, 2005, two soil vapor extraction wells (SVE-1 and SVE-2) were installed onsite by SECOR The results of this work are documented in SECOR's report titled SVE Well Installation and SVE Pilot Test Report, dated August 31, 2005 SENSTIVE RECEPTORS SECOR performed a sensitive receptor survey to identify the location of permitted water • supply wells within a 2,000-foot radius of the site The sensitive receptor survey consisted of reviewing the California Department of Water Resources (DWR) files for locating water supply wells in the area, contacting the local water purveyor (San Joaquin