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1117 Lone Palm Avenue, Suite B <br /> V! ATC <br /> Modesto, CA 95351 <br /> hftp:llwww.atcassociates.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A s $ CC I AT IS I N C . <br /> June 21, 2005 <br /> 54.25847.0037 <br /> EJIJ� � <br /> Ms. Victoria McCartney r <br /> San Joaquin County <br /> Environmental Health DepartmentEiuti1! 0f ;;; 1 i f EfLTH Q1,,0 <br /> 304 E. Weber Street, Third Floor FERN!1T;'SEI VICES ,]fy\ <br /> Stockton, California 95202 <br /> Subject: Monitoring Report First Quarter 2005, Former Cheaper Store #37, 15 East Grant <br /> Line Road, Tracy, California, Local Oversight Program (LOP) # 1404 <br /> Dear Ms. McCartney: <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> March 24, 2005, 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 evaluate the groundwater <br /> 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 /> els the site and a sensitive receptor survey within a 2,000-foot radius of the site was conducted by <br /> Kleinfelder. Based on Kleinfelder's Groundwater Assessment Report dated April 12, 1988, <br /> •� '�s 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 1 and 4, 1988. The <br /> ti3O � 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. Based on Kleinfelder's Additional Monitoring Well report dated April 22, <br /> 1998, petroleum hydrocarbons were detected in the groundwater sample collected from MW4 on <br /> April 19, 1988. The groundwater flow direction was reported to be toward the northwest on April <br /> 20, 1988. <br /> 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />