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1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> L� www atc-enviro com <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S 0 C 1 A T E 5 1 N C <br /> January 20, 2003 ,e,�'� �E D <br /> 54 16393 0002 �`N�� JAN 2 2 2003 <br /> 4V ENVIRONMENT HEALTH �� ' <br /> Ms Vicky McCartneyU PERMIT/SERVICES <br /> San Joaquin County Public Health ServicesF <br /> Environmental Health Division � v0 � X4 # �f <br /> 304 E Weber Street Third Floor �L"4 <br /> Stockton, California 95202 IV <br /> t - <br /> Subject Monitoring Report Third Quarter 2002, 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 performed <br /> between July and September, 2002 by ATC Associates Inc at the site located at 3755 Munford <br /> Avenue, Stockton, California (Figure 1) Quarterly groundwater monitoring and sampling was <br /> performed to monitor the distribution of petroleum hydrocarbons in groundwater to determine <br /> the groundwater flow direction and the hydraulic gradient in the uppermost aquifer Monthly <br /> monitoring was performed to evaluate the effectiveness of the groundwater filtration system and <br /> remove free product from the skimmer system <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 1163931quart1yl3gr-2002 doe 1 <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />