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A S S O C I A T E S I N C <br /> 1 Off-Site Subsurface <br /> Investigation Report <br /> ' Farmer Property <br /> 610 North Hunter Street <br /> Stockton, California <br /> ATC Project No 54 62596 0001 <br /> ' 1.0 INTRODUCTION <br /> ATC Associates Inc has prepared this off-site subsurface investigation report for the Farmer <br /> Property located at 610 North Hunter Street in Stockton, California The purpose of the off-site <br /> subsurface investigation was to define the lateral extent of impacted soil and groundwater to the <br /> 1 southeast, east, and northeast ATC submitted the Workplan for Additional Soil Boring and <br /> Monitoring Well Installation Activities at 610 North Hunter Street, Stockton, Cal fornaa, dated <br /> October 10, 2001 This workplan was approved by the San Joaquin County Environmental Health <br /> Division(SJCEHD)in correspondence dated November 2, 2001 <br />' 2.0 SITE DESCRIPTION AND BACKGROUND <br /> The site is located on the north side of Oak Street and the east side of Hunter Street, Stockton, <br /> California, as shown on Figure 1 The location is a commercial and residential area The <br /> location of the existing monitoring wells, vapor extraction wells, building, former underground <br /> storage tanks (USTs), and other pertinent features are shown on Figure 2 The site is bound by <br /> Canepas Car Wash to the north, a vacant lot to the east, Oak Street to the south, and Hunter Street <br /> to the west <br /> 2.1 Underground Storage Tanks <br /> On October 6, 1987, Al Williamson, General Contractor, removed two 1,000-gallon leaded <br />' gasoline tanks and one 550-gallon waste oil tank from the Iocations shown on Figure 2 Soil <br /> samples collected after the tank removals contained elevated concentrations of petroleum <br /> hydrocarbons and volatile organic compounds (VOCs) <br /> 2.2 Regional Geology and H dr <br /> o Bolo <br />' The site is underlain by the Modesto Formation, which is divided into nonmarme basin deposits, <br /> fan deposits, and stream channel deposits consisting of clay, silt, and sand (Rogers, 1966) Basin <br /> deposits are dominant at this site The Modesto Formation dips gently to the west (Wagner, et al , <br /> 1981) <br /> w lwordpro%62596Veportslfrp doe 1 <br />