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Shaw Environmental & infrastructure, Inc <br /> 4005 Port Chicago Highway <br /> Concord CA 94520-1120 <br /> 925 288 9898 <br /> Fax 925 288 0888 <br /> ON(R ] The Shaw Group Inc <br /> October2 <br /> 8, 2002 Nov 0 12002 <br /> IrNVIRCNMENT HEALTH <br /> Mr Bob DeNmno PERMIT/SERVICES <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97223 <br /> Subject Third Quarter 2002 Monitoring, Sampling, and Interim Remediation Report <br /> 7-Eleven Site No 20632 <br /> 4627 DaVmci Drive <br /> Stockton, California <br /> Shaw Environmental, Inc Project 779962 <br /> Dear Mr DeNinno <br /> This Third Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by Shaw Environmental, Inc (Shaw) at the subject site (Attachment 1, Figure 1) on <br /> July 10, 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), tent-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 in accordance with a scope of work meeting San Joaquin <br /> County Public Health Services (SJCPHS) requirements (Fluor Daniel GTI, Additional Site Assessment and <br /> 1 Corrective Acton Work Plan, January 8, 1997) The assessment concluded that soil impacted with <br /> gasoline appeared restricted to a limited area surrounding the underground storage tank (UST) pit and <br /> underlying the fuel dispensers The USTs were replaced as part of 1998 upgrading requirements <br /> Concurrent with limited overexcavation, several days of high-volume dewatering, pursued as part of <br /> construction activities, also served as a short-term remediation event <br />