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Shaw E=nvironmental & Infrastructure, Inc <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520-1120 <br /> 925 288 9898 <br /> Fax 925 288 0888 <br /> ONES The Shaw Group Inc'u <br /> P' ' �D <br /> December 17, 2002 <br /> DEC 2 3 2002 <br /> EINVr ,,, 1 ,EALTF <br /> Mr Bob DeNinno '90ICES <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97223 <br /> Subject Fourth Quarter 2002 Monitoring and Sampling Report <br /> 7-Eleven Site No 20632 <br /> a 4627 DaVinci Drive <br /> Stockton, California <br /> Shaw Environmental, Inc Project 779962 <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 (Attachment 1, <br /> Figure 1) on October 16, 2002 <br /> A summary of activities conducted during this reporting period is provided below <br /> o Depth to water(DTW)was gauged in seven site-related groundwater monitoring wells (MW-1, <br /> MW-2, MW-3, MW-4R, MW-5, MW-6, and MW-7) <br /> o Groundwater samples were collected from the monitoring wells and submitted to a <br /> California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), methyl-tert-butyl-ether(MTBE), tert-butanol (TBA), dusopropyl ether(DIPE), ethyl-tert- <br /> butyl ether(ETBE), tert-amylmethyl ether(TAME), and total petroleum hydrocarbons-as- <br /> gasoline (TPH-G) <br /> Background <br /> Initial site assessment activities were executed as required by the San Joaquin County Public Health <br /> Services (SJCPHS) (Fluor Daniel GTI, 1997) Assessment results indicated that gasoline-containing soils <br /> were present and adjacent to the underground storage tank (UST) pit and fuel dispenser areas The <br /> USTs were replaced as part of 1998 upgrading requirements Limited overexcavation combined with <br /> several days of high-volume dewatering was completed during construction activities as a form of <br /> remediation <br />