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1117 Lone Palm Avenue, Suite B <br /> V D Modesto, CA 95351 <br /> www atc-enviro com <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A 8 8 0 C I A T E 8 1 N C <br /> 4 <br /> REC L 'ED <br /> April 15, 2004 <br /> 54 25847 0037 MAY V 82004 E ��r.� <br /> NVIR(3l�ME:NT HEALTI� <br /> PERMII`/SERVIM i <br /> Ms Victoria McCartney <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Monitoring Report First Quarter 2004, Former Cheaper Store 937, 15 East Grant <br /> Line Road, Tracy, California <br /> Dear Ms McCartney <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> March 2, 2004, by ATC Associates Inc at the site located at 15 East Grant Line Road, Tracy, <br /> California (Figure 1) Sampling was performed to monitor the distribution of petroleum <br /> hydrocarbons in groundwater at the site Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in the uppermost aquifer <br /> SITE HISTORY <br /> On March 3, 1988, two 10,000-gallon underground storage tanks (USTs) were excavated and <br /> removed from the site One was used to store leaded gasoline and one was used to store <br /> unleaded gasoline Groundwater was encountered in the UST excavation at approximately seven <br /> feet below ground surface (bgs) Laboratory analyses of two samples of groundwater collected <br /> from within the excavation indicated the groundwater had been impacted by petroleum <br /> hydrocarbons <br /> On March 29 and 30, 1988, three monitoring wells (MW1, MW2, and MW3) were installed at <br /> the site and a sensitive receptor survey within a 2,000-foot radius of the site was conducted by <br /> Kleinfelder According to Klemfelder's Groundwater Assessment Report dated April 12, 1988, <br /> petroleum hydrocarbons were not detected at or above laboratory reported detection limits in the <br /> groundwater samples collected from MW1, MW2, and MW3 on April I and 4, 1988 The <br /> groundwater flow direction was reported to be toward the north <br /> On April 19, 1988, an additional monitoring well (MW4) was installed north of the former <br /> location of the USTs According to Kleinfelder's Additional Monitoring Well report dated April <br /> 22, 1998, petroleum hydrocarbons were detected in the groundwater sample collected from MW4 <br /> slenvaomenta1125847100371reportsllgr-2004 doc I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />