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j � I <br /> v 1117 tone Palm Avenue, S:�� <br /> Modesto, CA 95351 <br /> t TChttp//www atcassociates com <br /> 209 579 2221 <br /> 4 $ 8 0 C I A T E 8 f N C <br /> Fax 209 579 2225 <br /> t <br /> November 22, 2004 <br /> 54 62577 0001 n <br /> Ms Lori Duncan <br /> San Joaquin County NOV 2 9 2004 <br /> Environmental Health Department <br /> 304 E Weber Street, Third Floor c 0ividi'IN F HLALTH <br /> Stockton, California 95202 PE.2ivJ1iSERV10ES <br /> Subject Groundwater Monitoring Report Third 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 <br /> July 8, 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 MW I 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 /> 5 16257713QR-2004 doc <br /> ENVIRONMENTAL, GEOTECHNICAL AkD MATERIALS PROFESSIONALS <br />