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1117 Lone Palm Avenue, Suite B <br /> 1CVVV Modesto, CA 95359 <br /> ATChftp://www.atcassociates.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> A s a O C I A T E S 1 N C . <br /> ' March 23, 2005 © E DD <br /> 54.26823.0001 <br /> ' A RA - i 2005 <br /> Ms. Lori Duncan E('V11R0NN?,,PNT HEALTH <br /> San Joaquin County PERMIT/SERVICES <br /> Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> ' Stockton, California 95202 <br /> ' Subject: Third Quarter 2004, Combined Groundwater Monitoring and Remediation <br /> Systems Operations and Monitoring Report, Jamar Service Station, 4075 East <br /> Main Street, Stockton, California <br /> ' Dear Ms. Duncan: <br /> ' This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> July 17, 2004, August 13, 2004, and September 13, 2004 at the Jamar property located at 4075 <br /> East Main Street, Stockton, California (Figure 1). It also reports the operations and monitoring <br /> (O&M) of the remediation system performed during the Third Quarter 2004 by ATC Associates <br /> Inc. (ATC). Quarterly groundwater monitoring and sampling was performed to monitor the <br /> distribution of petroleum hydrocarbons in groundwater and to evaluate the groundwater flow <br /> ' direction and hydraulic gradient in the impacted aquifers. O&M of the remediation system was <br /> performed to evaluate the effectiveness of the ozone air sparge system at remediating petroleum <br /> t impacted soil and groundwater. <br /> i <br /> 1.0 SITE HISTORY <br /> iIn 1995, one 500-gallon waste oil underground storage tank (UST) and one 500-gallon kerosene <br /> UST were removed from the site. <br /> ' In December 1998, two 6,000-gallon and one 10,000-gallon gasoline USTs were removed from <br /> the site. Soil samples were collected from the tank pit and analyzed for petroleum hydrocarbons. <br /> Lab analyses indicated the samples collected from the tank pit contained detectable <br /> concentrations of petroleum hydrocarbon constituents. The excavation was subsequently <br /> backfilled and a 20,000-gallon UST was installed. <br /> In September 1999, John P. Cummings &Associates (JPCA) advanced three soil borings, MW I, <br /> MW2, and MW3 to depths ranging from approximately 74 to 78 feet below ground surface (bgs). <br /> The borings were completed as monitoring wells. <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />