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VI 1117 Lone Palm Avenue, Suite B <br /> V Modesto, CA 95351 <br /> www atc-enviro coni <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A 8 8 0 C I A T H 8 1 Id C <br /> NOV 2 5 200 3 <br /> November 18, 2003 ENV1RUNh1j0,,; ;tL <br /> 54 16393 0002 PERMiTjc, f <br /> Ms Victoria McCartney <br /> San Joaquin County �� S s <br /> Environmental Health Department r, ►'`''�(1� N� <br /> 304 E Weber Street, Third Floor °y <br /> Stockton, California 95202 �1�rJ�v4s y <br /> Subject Monitoring Report Third Quarter 2003, Pacific Coast Recreation, 3755 Munford at <br /> Avenue, Stockton, California A s7 <br /> Dear Ms McCartney <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> September 9, 2003, free product skimmer maintenance, and sampling of the carbon canisters by <br /> ATC Associates Inc at the site located at 3755 Munford Avenue, Stockton, California(Figure 1) <br /> Sampling was performed to monitor the distribution of petroleum hydrocarbons in groundwater <br /> at the site Monitoring was performed to determine the groundwater flow direction and the <br /> 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 /> S IEnvlromental\163931REPORTS13gr-2003 dog I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br /> t <br />