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S E C O R SECOR vmv.secor.00m <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> INCORPORATED Rancho Cordova,CA 95670 <br /> � �916-661-0400 TEL <br /> IIUUU��l1�1111 1 <br /> EV�� V LTV-0430 FAX <br /> JU <br /> June 13, 2006 N 2 20066 3 [006 <br /> Mr. Mike Infurna ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> ,d <br /> RE: Quarterly Status Summary Report—Second Quarter 2006 <br /> Circle K Store#01205 7 <br /> 16470 Cambridge Drive <br /> Lathrop, California <br /> SECOR Project#77CP.02031.00.0304 <br /> Dear Mr. Infurna: <br /> On behalf of ConocoPhillips, SECOR International Incorporated is forwarding the quarterly status <br /> summary report for the site referenced above. <br /> SITE DESCRIPTION <br /> The site is located on northeast corner of Cambridge Drive and Louise Avenue in Lathrop, <br /> California, and is an operating Circle K mini mart and service station. <br /> PREVIOUS ASSESSMENT <br /> In November 1997, Pacific Environmental Group (PEG) performed oversight and sampling during <br /> the removal of one 4,000-gallon and two 10,000-gallon underground storage tanks(LISTS),product <br /> dispensers, and associated product piping from the site during facility upgrade activities. <br /> Approximately 1,241 tons of petroleum hydrocarbon-impacted soil was excavated from beneath the <br /> LISTS and from the new UST excavation. Additionally, approximately 17,000 gallons of petroleum <br /> hydrocarbon-impacted groundwater was removed from the new UST excavation. Total petroleum <br /> hydrocarbons as gasoline(TPHg)were reported at concentrations ranging from 130 parts per million <br /> (ppm)to 5,800 ppm. Methyl tert-butyl ether(MTBE)was reported in soil at concentrations ranging <br /> from 0.19 ppm to 3.6 ppm (PEG, 1998). <br /> In July 1998, one GeoprobeTm boring was advanced to a depth of 40 feet below ground surface <br /> (bgs) downgradient (north) of the former UST excavation. Laboratory analysis of soil reported <br /> maximum concentrations of TPHg and MTBE of 1,900 ppm (GP-1-10') and 0.31 ppm (GP-1-10'), <br /> respectively. Laboratory analysis of groundwater reported concentrations of TPHg and MTBE of <br /> 52,000 parts per billion (ppb) and 61 ppb, respectively(PEG, 1999). <br /> From August through September 1998, IT Corporation (IT) drilled and installed four groundwater <br /> monitoring wells (MW-1 through MW-4) to approximate depths of 26 to 28 feet bgs. During the <br /> installation of well MW-4, the drill auger broke through a City of Lathrop water main, releasing <br /> approximately 600,000 to 1,000,000 gallons of water. Laboratory analysis of soil reported maximum <br /> concentrations of TPHg and MTBE of 6,800 ppm(MW-3-16')and 7.2 ppm (MW-2-11'), respectively. <br />