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a <br /> ATC Associates Inc. <br /> YVATC <br /> 1117 tone Palm Avenue, Suite B <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> fax: 209-579-2225 <br /> A S S 0 C I A T E S I N C_ <br /> Li <br /> January 19, 2006 1 A N., 21)06 <br /> 54.25847.0037 <br /> ENVIRONMENT HEALTH <br /> PERMIT ICES �4� <br /> Ms. Victoria McCartney -' It `' <br /> San Joaquin County �r `` rk� <br /> Environmental Health Department r <br /> r <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Monitoring Report Third Quarter 2005,Former Cheaper Store#37, 15 East Grant Line <br /> 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 /> September 30, 2005, by ATC Associates Inc. (ATC) at the site located at 15 East Grant Line Road, <br /> Tracy, 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 flow <br /> 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 unleaded <br /> gasoline. Groundwater was encountered in the UST excavation at approximately seven feet below <br /> ground surface (bgs). Laboratory analyses of two samples of groundwater collected from within the <br /> excavation indicated the groundwater had been impacted by petroleum hydrocarbons. <br /> On March 29 and 30, 1988, three monitoring wells (MWl,MW2, and MW3) were installed at the site <br /> and a sensitive receptor survey within a 2,000-foot radius of the site was conducted by Kleinfelder. <br /> Based on Kleinfelder's Groundwater Assessment Report dated April 12, 1988, petroleum <br /> hydrocarbons were not detected at or above laboratory reported detection limits in the groundwater <br /> samples collected from MWl, MW2, and MW3 on April 1 and 4, 1988. The groundwater flow <br /> direction was reported to be toward the north. <br /> On April 19, 1988, an additional monitoring well (MW4) was installed north of the former location of <br /> the UST's. Based on Kleinfelder's Additional Monitoring Well report dated April 22, 1998, petroleum <br /> hydrocarbons were detected in the groundwater sample collected from MW4 on April 19, 1988. The <br /> groundwater flow direction was reported to be toward the northwest on April 20, 1988. <br /> In late April 1988, the open excavation associated with the former USTs was expanded by excavating <br /> petroleum impacted vadose zone soils. As reported in Kleinfelder's Soil Removal Report dated May 3, <br /> s:lenviromenta1125847�0037uepomt 3gr-2005.doc l <br />