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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> %TC <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S O G I A T E 8 I N C <br /> June 23, 2004 <br /> 54.26823.0001 J U L 0 6 2004 <br /> ENVIRONMENT HEALTH <br /> Ms. Lori Duncan PERMIT/SERVICES <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Monitoring Report First Quarter 2004, Jamar Service Station, 4075 East Main <br /> Street, Stockton, California <br /> Dear Ms. Duncan: <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> March 16 and 17, 2004, by ATC Associates Inc. (ATC) at the site located at 4075 East Main <br /> Street, Stockton, California (Figure 1). Sampling was performed to monitor the distribution of <br /> petroleum hydrocarbons in groundwater at the site. Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in shallow groundwater. <br /> SITE HISTORY <br /> In I995, one 500-gallon waste oil underground storage tank (UST) and one 500-gallon kerosene <br /> UST were removed from the site. <br /> In December 1998, two 6,000-gallon and one 10,000-gallon gasoline USTs were removed from <br /> the site. Soil samples were collected from the tank pit and analyzed for petroleum hydrocarbons. <br /> Analytical testing indicated the samples collected from the tank pit contained detectable <br /> concentrations of petroleum hydrocarbon constituents. The excavation was subsequently <br /> backfilled and a 20,000-gallon UST was installed. <br /> In September 1999, John P. Cummings & Associates (JPCA) advanced three soil borings, MW1, <br /> MW2, and MW3 to depths ranging from approximately 74 to 78 feet below ground surface (bgs). <br /> - The.borings were completed as monitoring wells. <br /> In August 2000, JPCA advanced three soil borings BI, MW4, and MWS, two of which were <br /> completed as monitoring wells. Soil boring B 1 was advanced to a depth of 115 feet bgs and <br /> . wells MW4 and MW5 were advanced to a depth of 75 feet bgs. Soil and groundwater samples <br /> SA268231QM reports12004 1QR.doc 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />