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Shaw Environmental & Infrastructure, Inc <br /> 116 4005 Port Chicago Highway <br /> Concord, CA 94520-1120 <br /> 925 288 9898 <br /> da Fax 925 288 0888 <br /> I'1 The Shaw Group InC E-- �W E <br /> D <br /> ' D E C 2 3 2002 <br /> December 10, 2002 ENVIRONMENI HEALTH <br /> ' PERMIT/SERVICES <br /> ' Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97223 <br /> 1 Subject Fourth 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 DeNinno <br /> This Fourth Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by Shaw Environmental, Inc (Shaw) at the subject site (Figure 1, <br /> Attachment 1) on October 1, 2002 A summary of activities conducted during this reporting period is <br /> ' provided below <br /> Depth to water(DTW)was gauged in four site-related groundwater monitoring wells <br /> • Groundwater samples collected from the monitoring wells were submitted to a California- <br /> certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes (BTEX), <br /> ' total petroleum hydrocarbons-as-gasoline (TPH-G), and oxygenates methyl-tert-butyl ether <br /> (MTBE), tert-butanol (TBA), diisopropyl ether(DIPS), ethyl-tert-butyl ether(ETBE), and tert- <br /> amylmethyl ether(TAME) <br /> • A soil vapor extraction (SVE) test was conducted on October 17, 2002 by application of <br /> vacuum to well SPV-2 and groundwater monitoring well MW-1 <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), and were not replaced Six soil samples were <br /> obtained from the base of the UST pit, and two soil samples were obtained from beneath the pump islands <br /> 1 and associated fuel-dispensing piping Tank pit sod samples were collected from about 14 feet below <br /> grade (bg), pump-island-area samples were obtained from depths of about 4 feet bg <br /> I <br />