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�4 <br /> L� a <br /> $M <br /> A S S O C I A T E S I N C <br />' Summary Report of <br /> Subsurface Investigation <br /> Pacific Coast Recreation <br /> 3755 Munford Avenue <br /> Stockton, California <br />' ATC Project No 16393 0001 <br />' 1.0 INTRODUCTION <br />' ATC Associates Inc has prepared this letter report on behalf of Pacific Coast Recreation to <br /> summarize findings of the subsurface investigation performed at the above referenced site (Figure <br /> 1) The purpose of the subsurface investigation was to evaluate the vertical and horizontal extent <br /> of impacted soil and groundwater, if any, in the vicinity of the former 10,000-gallon and 1,000- <br /> gallon underground storage tanks (USTs) This work was done at the request of San Joaquin <br /> County Public Health Services, Environmental Health Division (PHS/EHD) in correspondence <br /> dated February 3, 1998 The findings of the subsurface investigative study are summarized in the <br /> following 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 nixed industrial and residential area <br /> and the site is currently occupied by Pacific Coast Recreation <br />' 1_2 Background <br /> In May 1991, one 10,000-gallon diesel UST, one 1,000-gallon unleaded gasoline UST, and all <br /> iassociated 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 /> November 24, 1997 MJ Kloberdanz and Associates concluded that additional investigation <br /> activities would be required <br /> w\163931reportslsurm doe 1 <br /> 1 <br />