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1 <br /> ATC Associates Inc <br /> 1117 Lone Palm Avenue, Suite B <br /> (M%TCModesto, California 95351 <br /> . 209-579-2221 <br /> A S S O C i A T E S I N C fax 209-579-2225 <br /> December 13, 2004 <br /> 54 62577 0001 <br /> Ms Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 E Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject Groundwater Monitoring Report Fourth Quarter 2004, Diesel Performance, 2804 <br /> East Fremont Street, Stockton, California, Local Oversight Program (LOP) #1120 <br /> Dear Ms Duncan <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> October 6, 2004 by ATC Associates Inc (ATC) at the site located at 2804 East Fremont Street in <br /> Stockton, California (Figure 1) Sampling was performed to monitor concentrations of petroleum <br /> hydrocarbons in groundwater at the site Monitoring was performed to evaluate groundwater <br /> quality and to determine the hydraulic gradient and direction in the uppermost aquifer <br /> SITE HISTORY <br /> In February 1987, SEMCO removed and disposed of one 3,000-gallon unleaded gasoline <br /> underground storage tank (UST), associated piping, and fuel dispenser from the location shown <br /> on Figure 2 A soil sample collected from 13 feet below ground surface (bgs) contained elevated <br /> concentrations of petroleum hydrocarbon contaminants The excavation was subsequently <br /> backfilled and resurfaced <br /> On July 23, 1997, an ATC geologist supervised the advancement of five soil borings (SBI <br /> through SB5) ranging in depth from 6 to 46 feet bgs. The soil borings were advanced using a <br /> truck mounted Geoprobe® narrow diameter rig employing direct push technology Petroleum <br /> hydrocarbons were detected in soil samples submitted for laboratory analyses Site activities are <br /> summarized in ATC's Summary Report for Subsurface Investigation, dated October 20, 1997 <br /> On September 25, 1998, ATC personnel supervised the advancement of soil boring MWI at the =site to a depth of approximately 65 feet bgs to evaluate groundwater for the presence of <br /> petroleum hydrocarbons The soil boring was completed as a groundwater monitoring well and <br /> on September 28, 1998 the well was developed and sampled Analytical data indicated that soil <br /> and groundwater samples contained detectable concentrations of petroleum hydrocarbons Field <br /> r <br /> f <br /> S 16257714QR 2004 clot 1 <br />