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CT <br /> 1117 Lone Palin Ave , Suite B <br /> Modesto, California 95351 <br /> www atc-envl ro corn <br /> 209 579 2221 <br /> is Fax 209 579 2225 <br /> A S S O C I A T E S 1 N C �+k 0 <br /> August 20, 2002 0 <br /> 54 16393 0002 ���'� RECENED <br /> AUG 2 2 2002 <br /> ENV1RORMENT HEALTH <br /> Ms Margaret Lagorio PERMIT/SERVICES <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 2002, Pacific Coast Recreation, 3755 Munford <br /> Avenue, Stockton, California <br /> Dear Ms Lagorio <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> April 4, 2002 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 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 /> lei 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 1163931quart1yl1gr-2002 doc I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />