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L <br /> a <br /> A S S O C I A T E S I N C <br /> Summary Report of <br /> ' Additional Subsurface Investigation <br /> Inland Paint Company <br /> 117 West Harding Way <br /> ' Stockton, California <br /> ATC Project No. 17295.0001 <br /> 1.0 INTRODUCTION <br /> ' ATC Associates, Inc. has prepared this report on behalf of Inland Paint Company to summarize <br /> the soil excavation and additional subsurface investigation activities performed at the above <br /> referenced site. This work was done at the request of San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) in correspondence dated April 16, 1998. <br /> The findings of the subsurface investigative study are summarized in the following paragraphs. <br /> ' 1.1 Site Location <br /> r) The site is located on the north side of Harding Way and the east side of Pacific Avenue in <br /> Stockton, California, as shown on Figure 1. The vicinity of the site is primarily a commercial and <br /> ' residential area. The site is currently occupied by Inland Paint Company. <br /> 1_2 Background <br /> ' In March 1990, one 1,000-gallon UST 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 1,000-gallon UST location indicated the presence of detectable concentrations of <br /> ethylbenzene and xylenes. After the tank was removed, the area of excavation of the former tank <br /> was backfilled with backfill material provided by Stockton Service Station Equipment. <br /> ' On January 8, 1998, an ATC geologist supervised the advancement of one soil boring to 41.5 feet <br /> below ground surface (bgs). A site plan showing the location of soil boring SB 1 is included as <br /> ' Figure 2. Soil samples were collected at five foot intervals and submitted for analysis of total <br /> petroleum hydrocarbons as gasoline and diesel (TPHg and TPHd) by EPA Methods 8015; and <br /> volatile organic compounds (VOCs) by EPA Method 8260. A Hydropunch groundwater <br /> ' sampling probe was advanced in the soil boring and a groundwater sample was collected. The <br /> groundwater sample was analyzed for TPHg, TPHd, VOCs, and halogenated volatile organic <br /> compounds (HVOCs) by EPA Method 8010/8020. Subsequent to the sample collection, the open <br /> ' sampling hole was tremie grouted to the surface with neat cement. <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from boring SB 1. <br /> The highest reported constituent concentrations were observed in the soil sample collected at 5.5 <br /> w:117295Veporu\sumii.doc 1 <br />