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1 <br /> n <br /> ATC Associates Inc <br /> CVVA <br /> 1117 Lone Palm Avenue, Suite B <br /> TC <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> A s s o c t A T E s i N c Fax 209-579-2225 <br /> July 15, 2005 <br /> RO-11ECIEWED <br /> 54 16393 0002 JUL 2 5 2005 <br /> ENVIRONMENT HEALTH <br /> Ms Victoria McCartney PERMIT/SERVICES j J.IV+�p� <br /> San Joaquin County <br /> Environmental Health Department 1I I <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 Wla� <br /> Subject Monitoring Report First Quarter 2005, Pacific Coast Recreation, 3755 Munford <br /> Avenue, Stockton, California, Site Code 1865 <br /> Dear Ms McCartney <br /> This report presents the results of quarterly groundwater monitoring and sampling performed by <br /> ATC Associates Inc (ATC) on March 4, 2005 at the site located at 3755 Munford Avenue, <br /> Stockton, California (Figure 1) It also presents the monthly sampling for groundwater discharge <br /> from the carbon canisters performed on January 21, February 21 and March 4, 2005 <br /> Sampling was performed to monitor the distribution of petroleum hydrocarbons in groundwater <br /> at the site Monitoring was performed to evaluate 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 underground storage tank (UST), one 1,000-gallon <br /> unleaded-gasoline UST, and 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 The samples collected from beneath the USTs contained detectable <br /> concentrations of petroleum hydrocarbons The excavations were subsequently backfilled <br /> In November 1997, MJ Kloberdanz and Associates advanced one soil boring to approximately <br /> 715 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 /> S\163931REPORTSIIstgtr-2005 doc 1 <br />