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"N <br /> TC <br /> A S S O C I A T E S 1 N C <br /> ' Summary Report of <br /> Supplemental Subsurface Investigation <br /> N&S Irrigation <br /> 215 West Main Street <br /> Ripon, California <br /> ATC Project No 14981 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 supplemental subsurface investigation performed at the above referenced site <br /> (Figure 1) The purpose of the subsurface investigation was to evaluate the vertical and <br /> horizontal extent of residually impacted soil and groundwater This work was performed at the <br /> request of San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) The findings of the subsurface investigative study are summarized in the following <br /> Nparagraphs <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 Back;2round <br /> ' In March 1990, one 1,500-gallon unleaded gasoline underground storage tank (UST), one <br /> g g g <br /> unleaded gasoline UST of unknown size, and all associated piping and dispensing equipment were <br /> removed and transported off-site Laboratory analysis of soil samples collected from beneath the <br /> former 1,500-gallon UST location indicated the presence of detectable concentrations of total <br /> petroleum hydrocarbons Discoloration of the soil and a petroleum hydrocarbon odor were noted <br /> t <br /> in the field After the tanks were removed, the areas of the former 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 the <br /> presence of petroleum hydrocarbons One groundwater sample was collected from each boring at <br /> the depth groundwater was first encountered, approximately 30 feet bgs Groundwater samples <br /> indicated the presence of petroleum hydrocarbons Results are summarized in ATC's Summary <br /> Report of Subsurface Investigatrai, dated January 14, 1998 <br /> i <br /> w A 49811reportslAdd_Inv doc 1 <br />