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1117 Lone Palm Avenue, Suite-B <br /> iVj%TC Modesto; CA 95351 <br /> www.atc-enviro.com <br /> 209.579.2221 <br /> Fax 209.579.2225 <br /> r A S S O 'C 1 A.T E .S T N C <br /> w <br /> January 9, 2004 �"�' <br /> 54.25847.0037 <br /> NED .Y <br /> Ms. Victoria McCartney JAIL 1 4 2004 <br /> San'Joaquin County <br /> Environmental Health Department :ENVIR(1NMENRV E STH <br /> 304 E. Weber Street, Third Floor•-, PERMiT1 <br /> Stockton, California 95202 <br /> Subject: Monitoring Report Fourth Quarter 2003, Former Cheaper Store #37; 15 East <br /> Grant Line Road, Tracy, California <br /> Dear Ms. McCartney: <br /> This. report presents the results of,quarterly groundwater monitoring and sampling performed on <br /> November 26, 2003, by ATC.Associates Inc. -at the site located at 15 East ,Grant Line Road, <br /> Tracy, California (Figure 1).. Sarn-pling was performed to. monitor the distribution of petroleum <br /> hydrocarbons in groundwater at the site. Monitoring was performed .to determine the <br /> groundwater flow direction and the hydraulic gradienf in the uppermost aquifer.. <br /> SITE HISTORY <br /> On March 3, 1988, one 10,0007gallon capacity underground storage tank (UST) used to .store <br /> leaded gasoline and one 10,000-gallon capacity UST used, to store. leaded gasoline were <br /> excavated and removed from. the site. Groundwater was.encountered in the UST excavation at <br /> approximately seven feet-below ground surface (bgs). Laboratory analyses of two samples of <br /> groundwater collected from within the excavation indicated the groundwater had been impacted <br /> by petroleum hydrocarbons: ' <br /> -On"March 29 and 30, 1988;,three monitoring wells (MW I, MW2,'and-MW3) were installed at <br /> the site and a sensitive receptor survey,within a 25000-foot.radius of-the site was conducted by <br /> Kleinfelder. According to Kleinfelder's Groundwater Assessment Report dated April 12, 1988, <br /> petroleum hydrocarbons.were not-detected.;at or:above laboratory reported detection limits in the <br /> groundwater samples collected from MW1, MW2; and MW3 on April 1 and 4, 1988. The <br /> groundwater flow direction was reported to:be toward the'north.. <br /> On April 19, 1988, an additional monitoring well (MW4)..was .installed north of the former <br /> location of the USTs. According to Kieinfelder's Additional Monitoring Well report.dated April <br /> 22, 1998, petroleum hydrocarbons were detected in the groundwatersample collected from MW4 <br /> saenviromenta1125847\00371reportsl4gr-2003.doc 1 <br /> ENVIRONMENTAL;GEOTECHNICAL AND MATERIALS PROFESSIONALS <br />