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SECOR www secor corn <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C ® B? INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> mnMOVED <br /> March 9, 2006 MAR 1 4 2006 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr Harlin Knoll <br /> San Joaquin County Public Heath Services <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California <br /> RE Quarterly Status Summary Report— First Quarter 2006 <br /> Circle K Store #08671 <br /> 8606 Thornton Road <br /> Stockton, California <br /> Dear Mr Knoll <br /> On behalf of ConocoPhillips,SECOR International Incorporated is forwarding the quarterly summary <br /> report for the following location <br /> Service Station Location <br /> •� Circle K Store #08671 8606 Thornton Road, Stockton, California <br /> SITE DESCRIPTION <br /> The site is located at 8606 Thornton Road, Stockton, California The site is currently an operating <br /> gasoline service station that contains two gasoline underground storage tanks (USTs), associated <br /> product lines, and dispensers <br /> PREVIOUS ASSESSMENT <br /> In May 1998, product lines and dispensers were upgraded to meet 1998 EPA standards Analytical <br /> results from pea gravel samples collected from above the USTs and soil samples collected from the <br /> former product line and dispenser excavations indicated the presence of petroleum hydrocarbons In <br /> sod beneath the site The results of this work are documented in SECOR's report titled Removal <br /> and Replacement of Product Lines and Dispensers, dated July 22, 1998 During product line and <br /> dispenser upgrade activities,approximately 21 tons of petroleum-impacted soil were over-excavated <br /> from the site and disposed of at Forward Landfill <br /> On January 27 and 28, 1999, four groundwater monitoring wells (MW-1 through MW-4) were <br /> installed onsite by SECOR The results of this work are documented In SECOR's report titled Well <br /> Installation Report, dated March 16, 1999 Since their Installation, the four wells have been <br /> monitored and sampled quarterly <br /> On December 12th through 14th, 2001, one deep soil boring (SB-1)was drilled to an approximate <br /> . depth of 63 feet below ground surface (bgs) and three additional groundwater monitoring wells <br />