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7, <br /> 1117 Lone Palm Avenue <br /> Sdite.B <br /> QModesto, CK95351 <br /> 209.579J221, <br /> Fax 209.579.2225 <br /> 1 <br /> 7 ~i A S S d. C`I A T E S I N C 1 <br /> :June 7, 1999 <br /> 17295 <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 First Quarter 1999, Inland Paint Company, 117 West Harding <br /> Way, Stockton, California <br /> Dear Mr. Infurna: <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> March 29, 1999 by ATC Associates Inc. at the site located at 117 West Harding Way, Stockton, <br /> California (Figure 1). Monitoring was performed to determine the groundwater flow direction <br /> and the hydraulic gradient in the uppermost aquifer. Sampling was performed to monitor the <br /> distribution of petroleum hydrocarbons in groundwater at the site. <br /> i <br /> SITE HISTORY <br /> In March 1990, one 1,000-gallon underground storage tank (UST) and all associated piping and <br /> dispensing equipment were removed and transported off-site. Laboratory analysis of soil <br /> samples collected from beneath the former 1,000-gallon UST location indicated the presence of <br /> lsdetectable concentrations of ethylbenzene and xylenes. After the tank was removed, the area of <br /> excavation of the former tank was backfilled with backfill material provided by Stockton Service <br /> Station Equipment. <br /> t On January 8, 1998, an ATC geologist supervised the advancement of one soil boring to 41.5 <br /> feet below ground surface (bgs). Soil samples were collected 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 sample <br /> was collected and analyzed for TPHg, TPHd, VOCs, and halogenated volatile organic <br /> compounds (HVOCs) by EPA Method 801018020. <br /> Petroleum hydrocarbon constituents were detected in soil samples collected from boring SB 1. <br /> 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:1172951quan1yl4gr-1998.doc 1 <br /> ,o-1 <br />