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I <br /> F � 1117 tone Palm Avenue <br /> Suite B <br /> Modesto CA 95351 <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> i <br /> A S S O C I A T E S I N C <br /> June 26, 2000 <br /> 16393 { <br /> C— <br /> _ <br /> Ms Carol Oz <br /> San Joaquin County Public Health Services , ;r <br /> Environmental Health Division - - <br /> 304 E Weber Street, Third Floor •• „' <br /> Stockton, California 95202 <br /> Subject Monitoring Report Second Quarter 2000, Pacific Coast Recreation, 3755 Munford <br /> Avenue, Stockton, California <br /> Dear Ms Oz <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in <br /> May 2000 by ATC Associates Inc at the site located at 3755 Munford Avenue, 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 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 1 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 1163931quartlyl2gr-2000 doc I <br />