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1 + <br /> 1117 Lone Palm Avenue, Suit <br /> VA%TC <br /> Modesto, CA 95351 <br /> www ate-enwro com <br /> - m '' ' ", _ ,�'M�,��l 209 579 2221 <br /> " - u t�^ Fax 209 579 2225 <br /> A S S O C I A T E S k N C <br /> November 3, 2003 <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 Third Quarter 2003, Diesel Performance, 2804 East <br /> Fremont Street, Stockton, California <br /> Dear Ms Duncan <br /> This report presents the results of quarterly groundwater monitoring and sampling performed in July <br /> 2003 by ATC Associates Inc (ATC) at the site located at 2804 East Fremont Street in Stockton, <br /> California (Figure 1) Sampling was performed to monitor concentrations of petroleum hydrocarbons <br /> in groundwater at the site Monitoring was performed to evaluate groundwater quality and to <br /> determine the hydraulic gradient and direction in the 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 on <br /> 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 backfilled <br /> and resurfaced <br /> On July 23, 1997, an ATC geologist supervised the advancement of five soil borings ranging in depth <br /> from 6 to 46 feet bgs The soil borings were advanced using a truck mounted Geoprobe® narrow <br /> diameter rig employing direct push technology Petroleum hydrocarbons were detected in soil <br /> samples submitted for laboratory analyses Site activities are summarized in ATC's Summary Report <br /> for Subsurface Investigation, dated October 20, 1997 <br /> On September 25, 1998, ATC personnel supervised the advancement of soil boring MWl at the site <br /> to a depth of approximately 65 feet bgs to evaluate groundwatei for the presence of petroleum <br /> hydrocarbons The soil boring was completed as a groundwater monitoring well and on September <br /> 28, 1998 the well was developed and sampled Analytical data indicated that soil and groundwater <br /> - - samples contained detectable concentrations of petroleum hydrocarbons Field activities and ——- <br /> analytical results are detailed in ATC's Sumniary Report of Additional Subsurface Investigation, <br /> dated January 8, 1999 <br /> In December 1999, ATC personnel supervised the advancement of soil borings MW2, MW3, and <br /> MW4 at the site to depths of approximately 65 feet bgs to evaluate groundwater for the presence of <br /> wlwordpro16257713QR.2uF<NMMONMENTAL, GEOTECHNICAL AWD MATERIALS PROFESSIONALS <br />