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,CVvATC <br /> ASSOCIATES I NC <br /> ' Summary Report of <br /> Additional Subsurface Investigation <br /> N&S Irrigation <br /> ' 215 West Main Street <br /> Ripon, California <br /> ' ATC Project No 14951 0001 <br /> ' 1.0 INTRODUCTION <br /> ATC Associates Inc has prepared this letter report, on behalf of N&S Irrigation to summarize <br /> findings of the additional subsurface investigation performed at the above referenced site (Figure <br /> 1) The purpose of the subsurface investigation was to evaluate the horizontal extent of <br /> t residually impacted soil and groundwater This work was performed at the request of San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) The <br /> findings of the subsurface investigative study are summarized in the following paragraphs <br /> 1.1 Site Location <br /> ' The site is located on the north side of West Main Street and the east side of Locust Avenue, <br /> Ripon, California, as shown on Figure 1 The location is a residential and commercial area The <br /> ' site is currently occupied by N&S Irrigation <br /> 1.2 Background <br /> In March 1990, one 1,500-gallon unleaded gasoline underground storage tank (UST), one <br /> unleaded gasoline UST of unknown size, and all associated piping and dispensing equipment <br /> ' were removed and transported off-site Laboratory analysis of soil samples collected from <br /> beneath the former 1,500-gallon UST location indicated the presence of detectable <br /> concentrations of total petroleum hydrocarbons Discoloration of the soil and a petroleum <br /> ' hydrocarbon odor were noted in the field After the tanks were removed, the areas of the former <br /> tanks were backfilled <br /> ' On November 14, 1997, a geologist from ATC Associates supervised the advancement of two -- <br /> soil borings to 30 feet below ground surface (bgs) Analytical results of soil samples indicated <br /> ' the presence of petroleum hydrocarbons One groundwater sample was collected from each <br /> boring at the depth groundwater was first encountered, approximately 30 feet bgs Groundwater <br /> samples indicated the presence of petroleum hydrocarbons Results are summarized in ATC's <br /> Summary Report of Subsurface Investigation, dated January 14, 1998 <br /> w\14981\repons\sumwc1 doc 1 <br /> 1 <br />