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1117 Lone Palm Ave , Suite B <br /> V � v' K"` Modesto, California 95351 <br /> A,f www atc-envlro com <br /> 209 579 2221 <br /> Fax 209 579 2225 <br /> A S S O C I A T E S I N C <br /> August 13, 2002 <br /> 54 16393 0002 <br /> AUG i 9 2002 <br /> Ms Margaret Lagorio ENV{RORMENT HEAL1 <br /> San Joaquin County Public Health Services PERMIT/SERVICES � J <br /> Environmental Health Division <br /> 304 E Weber Street, Third Floor 'y ��' <br /> Stockton, California 95202 �5 Q <br /> Subject Monitoring Report Second Quarter 2002, Pacific Coast Recreation, 3755 Munford <br /> Avenue, Stockton, California <br /> Dear Ms Lag orio1 <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> June 25, 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 /> r <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 /> +l and`groundwater are impacted by petroleum hydrocarbons Site activities were summarized in <br /> -ATC's Summary Report of Subsurface Investigation, dated January 15, 1999 <br /> w 1163931quart1yl2gr-2002 doc I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />