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Shaw Environmental & Infrastructure, Inc <br /> I� 4005 Port Chicago Highway <br /> Concord CA 94520-1120 <br /> (• 925 288 9898 <br /> Fax 925 288 0888 <br /> IShaW The Shaw Group Inc'µ <br /> October 21, 2002 <br /> OCT <br /> ENVIR0NT NT SERVICES H <br /> Mr Bob DeNmno PERM j <br /> ' 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97223 <br /> Subject Third Quarter 2002 Monitoring and Sampling Report <br /> 7-Eleven Store No 21756 <br /> ' 853 E Yosemite Avenue <br /> Manteca, California <br /> Shaw Project No 781723 <br /> Dear Mr DeNmno <br /> This Third Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by Shaw Environmental, Inc (Shaw) (formerly IT Corporation) at the subject site <br /> (Figure 1, Attachment 1) on July 1, 2002 A summary of activities conducted during this reporting period is <br /> ' provided below <br /> Depth to water(DTVV)was gauged in four site-related groundwater monitoring wells <br /> Groundwater samples were collected from the three monitoring wells and submitted to a <br /> California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes <br /> ' (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G), and oxygenates methyl-tert-butyl <br /> ether(MTBE), tert-butanol (TBA), dusopropyl ether (DIPS), ethyl-tert-butyl ether(ETRE), and <br /> tert-amylmethyl ether(TAME) <br /> ' Background <br /> On December 9, 1998, three 10,000-gallon steel single-wall underground storage tanks (USTs)were <br /> ' removed from the site (IT Corporation, January 1999) Six soil samples were obtained from the base of <br /> the UST pit, and two sod samples were obtained from beneath the pump islands and associated fuel <br /> i dispensing piping Tank pit soil samples were collected from about 14 feet below grade (bg), pump-island- <br /> area samples were obtained from depths of about 4 feet bg <br /> All sod samples were analyzed for BTEX, TPH-G, and total petroleum hydrocarbons as diesel (TPH-D) by <br /> EPA Methods 8015/8020 The samples were also analyzed for MTBE and other oxygenates using EPA <br /> Method 8260 <br /> L <br /> i <br />