Laserfiche WebLink
7 <br /> !: 1117 Lone Palm Avenue, Suite B <br /> Modesto, CA 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> ASSOCIATES I NC . Fax 209.579.222 <br /> March 22, 2004 <br /> 54.26823.0001 U) <br /> MAR 2 9 2004 <br /> Ms. Lori Duncan ENVIRONMENT HEALTH <br /> San Joaquin County PERMIT/SERVICES <br /> Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Monitoring Report Fourth Quarter 2003, Jamar Service Station, 4075 East Main <br /> Street, Stockton, California <br /> Dear Ms. Duncan: <br /> This report presents the results of quarterly groundwater monitoring and sampling performed on <br /> December 18, 2003, by ATC Associates Inc. at the site located at 4075 East Main Street, <br /> Stockton, California (Figure 1). Sampling was performed to monitor the distribution of <br /> petroleum hydrocarbons in groundwater at the site. Monitoring was performed to determine the <br /> groundwater flow direction and the hydraulic gradient in the uppermost'aquifer. <br /> SITE HISTORY <br /> In 1995, one 500-gallon waste oil underground storage tank (UST) and one 500-gallon kerosene <br /> UST were removed from the site. <br /> I <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 /> Analytical testing 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 1, <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 /> In August 2000, JPCA advanced three soil borings B1, MW4, and MW5, two of which were <br /> completed as monitoring wells. Soil boring BI was advanced to a depth of 115 feet bgs and <br /> wells MW4 and MW5 were advanced to a depth of 75 feet bgs. Soil•and groundwater samples <br /> SAEnviromental1268231QM reports12003 4QR.doe I <br /> ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />