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ATC Associates Inc <br /> M%TC <br /> 1117 Lone Palm Avenue, Suite B / <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> ASSOCIAT ES INC fax 209-579-2225 <br /> Apri123, 2004 <br /> 54 62577 0001 <br /> Ms Lon 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 Second Quarter 2004, Diesel Performance, 2804 <br /> East Fremont Street, Stockton, California <br /> Dear Ms Duncan <br /> This report presents the results of quarterly groundwater monitoring and sampling performed <br /> during second quarter 2004 by ATC Associates Inc (ATC) at the site located at 2804 East <br /> Fremont Street in Stockton, California (Figure I) Sampling was performed to monitor <br /> concentrations of petroleum hydrocarbons in groundwater at the site Monitoring was performed <br /> to evaluate groundwater quality and to determine the hydraulic gradient and direction in the <br /> uppermost aquifer <br /> BACKGROUND INFORMATION <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 ranging in <br /> depth from 6 to 46 feet bgs The soil borings were advanced using a truck mounted Geoprobe® <br /> narrow diameter rig employing direct push technology Petroleum hydrocarbons were detected <br /> in soil samples submitted for laboratory analyses Site activities are summarized in ATC's <br /> Summary Report for Subsurface Investigation, dated October 20, 1997 <br /> On September 25, 1998, ATC personnel supervised the advancement of soil boring MW1 at the <br /> 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 /> S 16257712QR-2004 doc <br />