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1 -- <br /> Summary Report of <br /> Additional Subsurface Investigation <br /> Eggiman Property <br /> 1112 East Harding Way <br /> Stockton, California <br /> ATC Project No 54 22493 0001 <br /> 5" ��0 61 tQ- n, —4- 13 <br /> 1.0 INTRODUCTION <br /> ATC Associates Inc has prepared this letter report, on behalf of Mr Robert Eggiman to <br /> summarize findings of the additional subsurface investigation activities performed at the <br /> Eggiman Property located at 1112 East Harding Way in Stockton, California (Figure 1) The <br /> purpose of the subsurface investigation was to evaluate the extent of petroleum hydrocarbon <br /> impacted soil and groundwater beneath the site This work was done at the request of San <br /> Joaquin County Environmental Health Department (EHD) The findings of the subsurface <br /> investigative study are sununanzed in the following paragraphs <br /> 1 1 Site Location <br /> The site is located on the south side of East Harding Way in Stockton, California, as shown on <br /> Figure 1 The property is located in a mixed residential, commercial, and industrial area The <br /> site is currently occupied by a hydraulic repair facility <br /> 1_2 Background <br /> In April 1987, SEMCO removed and disposed of two 1,000-gallon re ular gasoline underground <br /> storage tanks (USTs), associated piping, and fuel dispenser from the locations shown on Figure <br /> 2 A soil sample was collected from the end of each tank at approximately 17 feet below ground <br /> surface Analytical testing indicated the collected samples contained detectable concentrations of <br /> petroleum hydrocarbon constituents The excavation was subsequently backfilled to the ground <br /> surface <br /> On July 24, 1997, to investigate the extent of residual soil contamination at the site, a total of six <br /> soil borings were advanced to depths ranging: from approximately 16 to 31 feet below ground <br /> surface (bgs) Detectable concentrations of total petroleum hydrocarbons as gasoline (TPHg), <br /> total petroleum hydrocarbons as diesel (TPHd), and benzene, toluene, ethylberizene, and xylenes <br /> (BTEX) were observed in soil samples collected from the site The distribution of petroleum <br /> constituents beneath the site has been essentially defined and appears to be limited laterally to the <br /> immediate vicinity of the former tank pit The highest concentrations were reported between 10 <br /> al, and 20 feet bgs and generally attenuate rapidly with depth Only low concentrations of toluene <br /> S tEm 1romenta11224931repons\SUMIv doc 1 <br />