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1C. V U9 <br /> ASS OCIATES INC <br /> Summary Report of <br /> Additional Subsurface Investigation <br /> Ripon Unified School District <br />' 304 North Acacia Avenue <br /> Ripon, California <br />' ATC Project No 13099 0001 <br /> 1.0 INTRODUCTION <br />' ATC Associates Inc has prepared this letter report, on behalf of Ripon Unified School District to <br /> summarize findings of the additional subsurface investigation performed at the above referenced <br /> site (Figure 1) The purpose of the subsurface investigation was to evaluate the horizontal and <br />' vertical 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 /> Mparagraphs <br /> 1.1 Site Location <br /> The site is located on the east side of North Acacia Avenue and the north side of Pine Street <br /> Ripon, California, as shown on Figure 1 The location is a residential and commercial area The <br /> site is currently occupied by Ripon Unified School District <br /> 1.2 Background <br /> In February 1991, one 500-gallon underground storage tank UST of unknown fuel was <br /> g g g (UST) <br /> removed, in August 1991, one 550-gallon unleaded gasoline UST was removed, in October 1991, <br />' 47 feet of single wall piping was removed, and, in December 1991, one 7,500-gallon unleaded <br /> gasoline UST was removed Laboratory analysis of soil samples collected from beneath the <br />' former USTs and piping locations indicated the presence of detectable concentrations of total <br /> petroleum hydrocarbons Discoloration of soil and petroleum hydrocarbon odors were noted in <br /> the field After the tanks were removed, the areas of the former tanks were backfilled with the <br />' stockpiled material <br /> On April 23, 1998, a geologist from ATC Associates supervised the advancement of six soil <br /> borings, SBI through SBS, to 21 feet below ground surface (bgs) A site plan showing soil <br /> boring locations is included as Figure 2 Soil samples were collected at five-foot intervals and <br /> grab groundwater samples were collected from each boring Samples were analyzed for <br /> petroleum hydrocarbons and elevated concentrations of petroleum hydrocarbons were detected in <br /> soil and groundwater samples <br /> w 113099Vepcntslsumwe1 dm 1 <br />