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4 <br /> A S S D C I A T E S I N C <br />' Summary Report of <br /> Additional Subsurface Investigation <br /> Pacific Coast Recreation <br />' 3755 Munford Avenue <br /> Stockton, California <br /> ATC Project No 54 16393 0001 <br /> 1.0 INTRODUCTION <br />' ATC Associates Inc has prepared this report on behalf of Cohn Enterprises to summarize <br /> findings of the additional subsurface investigation performed at the Pacific Coast Recreation <br /> facility located at 3755 Munford Avenue in Stockton, California (Figure 1) The purpose of the <br />' subsurface investigation was to evaluate the lateral extent of impacted groundwater in the deep <br /> aquifer and to determine the need for the installation of additional deep monitoring wells at the <br /> site The purpose of the pump test was to investigate the vertical connectivity between shallow <br /> and deep aquifers and to assess the effects of pumping on vertical plume migration in the vicinity <br /> of the former underground storage tanks (USTs) This work was done at the request of San <br /> Joaquin County, Environmental Health Department (EHD) in correspondence dated December <br /> 16, 2002 The findings of the subsurface investigative study are summarized in the following <br /> report <br />' 1.1 Site Location <br /> The site is located on the north side of East Munford Avenue and east of the State Highway 99 in <br />' Stockton, California, as shown on Figure 1 The location is a mixed industrial and residential <br /> area and the site is currently occupied by Pacific Coast Recreation <br />' 1_2 Backeround <br />' In May 1991, one 10,000-gallon diesel UST, one 1,000-gallon unleaded gasoline UST, and all <br /> associated piping were removed by SEMCO from the locations shown on Figure 2 Soil samples <br /> were collected from beneath the USTs and analyzed for petroleum hydrocarbons Analytical <br /> testing indicated the samples collected from beneath the USTs contained detectable <br /> concentrations of petroleum hydrocarbon constituents The excavations were subsequently <br /> backfilled <br />' In November 1997, MJ Kloberdanz and Associates advanced one soil boring to approximately <br /> 71 5 feet below ground surface (bgs) Analytical results of soil samples collected at 25, 35, 45, <br /> 65, and 71 feet bgs indicated that soil was impacted by petroleum hydrocarbons Site activities <br /> were summarized in MJ Kloberdanz and Associates' Phase I Investigation Report, dated <br /> S1Enviromental1163931REPORTSIcptpumpreport doc 1 <br /> 1 <br />