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1117 Lone Palm Avenue, Suite B <br /> 0 Modesto, CA 95351 <br /> www atc-enviro com <br /> °FII A, Atg9�579 2221 <br /> 5 A S S O C I A T E S 1 N C I�aX 9 579 2225 <br /> E <br /> May 7, 2004 <br /> 54 16393 0002 <br /> All <br /> Ms Victoria McCartney <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, Pacific Coast Recreation, 3755 Munford <br /> Avenue, Stockton, California <br /> Dear Ms McCartney <br /> This report presents the results of quarterly groundwater monitoring and sampling, free product <br /> skimmer maintenance, and sampling of the carbon canisters performed during the first quarter of , <br /> 2004 by ATC Associates Inc at the site located at 3755 Munford Avenue, Stockton, California <br /> • (Figure 1) Sampling was performed to monitor the distribution of petroleum hydrocarbons in <br /> groundwater at the site Monitoring was performed to determine the groundwater flow direction <br /> and the hydraulic gradient in the uppermost aquifer <br /> SITE HISTORY <br /> In May 1991, one 10,000-gallon diesel underground storage tank (UST), one 1,000-gallon <br /> unleaded gasoline UST, and all associated piping were removed by SEMCO from the locations <br /> shown on Figure 2 Soil samples were collected from beneath the USTs and analyzed for <br /> petroleum hydrocarbons Analytical testing indicated the samples collected from beneath the <br /> USTs contained detectable concentrations of petroleum hydrocaibon constituents The <br /> excavations were subsequently backfilled <br /> I <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 /> S IEnvlromenta11163931REPORTS11gr-2004 doc I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />