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I <br /> I 1117 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A S S O C I A T E S 1.N C . <br /> July 20, 2000 <br /> 16393 <br /> rQ <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Monthly Depth to Water Monitoring.Event July 2000, Pacific Coast Recreation, <br /> 3755 Munford.Avenue, Stockton, California <br /> Dear Ms. Oz: <br /> This report presents the results of quarterly groundwater monitoring performed in July 2000 by <br /> y ATC Associates Inc. at the site located at 3755 Munford Avenue, Stockton, California(Figure 1). <br /> Monitoring was performed to determine the groundwater flow direction and the hydraulic <br /> gradient in the uppermost aquifer. <br /> SITE HISTORY <br /> In May 1991, one 10;.000-gallon diesel UST, one 1;000-gallon unleaded gasoline UST, and all <br /> associated piping were removed by SEMCO from the locations shown on Figure 2. Soil,samples <br /> were collected from beneath the USTs. and analyzed for petroleum,hydrocarbons. Analytical <br /> testing indicated the samples collected from beneath the USTs contained detectable <br /> concentrations of petroleum hydrocarbon constituents. The excavations were subsequently <br /> backfilled. <br /> In November 1997, MJ Kloberdanz and Associates advanced one soil boring to approximately <br /> 71.5 feet below ground surface (bgs). Analytical results of soil samples collected at 25, 35, 45, <br /> 65, and 71 feet bgs indicated that-soil was impacted by petroleum hydrocarbons. Site activities <br /> were summarized in MJ Kloberdanz and Associates' Phase I Investigation Report, dated <br /> November 24, 1997. MJ Kloberdanz and Associates concluded that additional investigation <br /> activities would be required. <br /> Tri November 1998, ATC personnel supervised the advancement of two soil borings to 78.5 feet <br /> bgs and one soil boring to 86.5 feet .bgs. The soil borings were converted into groundwater <br /> monitoring wells. Analytical results of soil samples and groundwater samples indicated that soil <br /> w:1163931quartlyl7-2000.doc 1 <br />