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' 1.0 INTRODUCTION ' ATC Associates Inc has prepared this Additional Subsurface Investigation Report for the Former Cheaper Store #37 (Figure 1) All work was completed in general accordance with ATC's Workplan for Additional Subsurface Investigation at Former Cheaper Store #37, IS ' East Grant Line Road, Tracy, California, dated April 19, 2004 The San Joaquin County Environmental Health Department (EHD) approved this workplan in correspondence dated July 12, 2004 ' 1.1 Site Location ' The Former Cheaper Store #37 is located at 15 East Grant Line Road in Tracy, California as shown on Figure 1 The site is located in a residential and commercial area ' 12 Background On March 3, 1988, two 10,000-gallon underground storage tanks (USTs) were excavated and ' removed from the site One tank was used to store leaded gasoline and the other was used to store unleaded gasoline Groundwater was encountered in the UST excavation at approximately seven feet below ground surface (bgs) Laboratory analyses of two groundwater samples collected from within the excavation indicated the groundwater had been impacted by petroleum hydrocarbons ' On March 29 and 30, 1988, three monitoring wells (MW1, MW2, and MW3) were installed at the site and a sensitive receptor survey was conducted within a 2,000-foot radius of the site by ' Kleinfelder According to Kleinfelder's Groundwater Assessment Report dated April 12, 1988, petroleum hydrocarbons were not detected at or above laboratory reported detection limits in the groundwater samples collected from MWI, MW2, and MW3 on April 1 and 4, 1988 The ' groundwater flow direction was reported to be toward the north On April 19, 1988, an additional monitoring well (MW4) was installed north of the former ' USTs According to Kleinfelder's Additional Monitoring Well report dated April 22, 1998 reported that petroleum hydrocarbons were detected in the groundwater sample collected from MW4 on April 19, 1988 The groundwater flow direction was reported to be toward the northwest on April 20, 1988 M1 In late April 1988, the open excavation associated with the former USTs was expanded by ' excavating petroleum impacted vadose zone soils Kleinfelder's Soil Removal Report dated May 3, 1988, approximately 350 to 400 cubic yards of soil were excavated from April 25 to ' 28, 1988 Laboratory analyses of soil samples collected from the sidewalls of the enlarged excavation indicated low concentrations of petroleum hydrocarbons remained at the south and . southeastern portion of the excavation SIEnviromental1251481Reportsloffsrte_SUM doc 1