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Mwrc <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www atc-enviro com <br /> 209 579 2221/r <br /> Fax 209 579 23 <br /> A S S O C I A T E S 1 N C <br /> March 26, 2004 <br /> 54 62577 0001 {—D, <br /> U [E C <br /> Ms Lon Duncan MAR 2 9 2004 <br /> San Joaquin County <br /> Environmental Health Department ENVIRONMENT HEALTH <br /> 304 E Weber Street, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> Subject Groundwater Monitoring Report First 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 first quarter 2004 by ATC Associates Inc (ATC) at the site located at 2804 East Fremont <br /> Street in Stockton, California (Figure 1) Sampling was performed to monitor concentrations of <br /> petroleum hydrocarbons in groundwater at the site Monitoring was performed to evaluate <br /> groundwater quality and to determine the hydraulic gradient and direction in the uppermost <br /> 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 far 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 /> activities and analytical results are detailed in ATC's Summary Report of Additional Subsurface <br /> Investigation, dated January 8, 1999 <br /> W 16257711QR-2004 da ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />