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CV <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto;`California 95351 <br /> www,atc-enviro.com <br /> "` 209.579.2221 <br /> ATFax 209:579.2225 <br /> A S S O C I A T E S I N C , <br /> November 7, 2000 <br /> .ti3 ... <br /> 54,i 6393.0002 <br /> s� r <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 October 2000, Pacific Coast <br /> Recreation, 3755 Munford Avenue, Stockton, California <br /> Dear Ms. Oz: <br /> j This report presents the results of.quarterly groundwater monitoring performed in October 2000 <br /> by ATC Associates Inc. at the site located at 3755 Munford Avenue, Stockton, California (Figure <br /> 1). 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 /> In 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:1163931quart1y110-2000.doc 1 <br /> l <br /> i <br />