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1117 Lone Palm Avenue <br /> aw Suite" 1 <br /> Mode <br /> r: sto, CA'9535 <br /> 209.579.2221' <br /> Fax 209.579.2225 <br /> A S S O C I A T E S I N C <br /> S - - <br /> I <br /> January 27, 1999 <br /> 17295 <br /> /V/11`L <br /> Mr. Mike Infurna <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Monitoring Report Fourth Quarter 1998, Inland Paint Company, 117 West <br /> Harding Way, Stockton, California <br /> I <br /> Dear Mr. Infurna: <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> November 1998 by ATC Associates Inc. at the site located at 117 West Harding Way, Stockton, <br /> California (Figure 1). Sampling was performed to monitor the distribution of petroleum <br /> hydrocarbons in groundwater at the site. Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in the uppermost aquifer. <br /> SITE HISTORY <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 and submitted for analysis of total petroleum hydrocarbons <br /> as gasoline and diesel (TPHg and TPHd) by EPA Methods 8015; and volatile organic compounds <br /> (VOCs) by EPA Method 8260. A Hydropunch groundwater sample was collected and analyzed <br /> for TPHg, TPHd, VOCs, and halogenated volatile organic compounds (HVOCs) by EPA Method <br /> 801018020. <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from boring SB 1. <br /> r� The highest reported constituent concentrations were observed at 5.5 feet bgs and appeared to <br /> +, attenuate rapidly with depth. Trace amounts of petroleum hydrocarbon constituents were also <br /> w:1172951quwt1y14gr-1998.doc 1 <br />