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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 /> �NECN The Shaw Group InC <br /> July 25, 2002 [RD V D <br /> AUG 0 12002 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc ENVIRONMENT HEALTH <br /> 10220 S W Greenburg Road, Suite 470 PERMIT/SERVICES <br /> Portland, OR 97223 <br /> Subject Second Quarter 2002 Monitoring, Sampling, and Interim Remediation Report <br /> 7-Eleven Site No 20632 <br /> 4627 DaVinci Drive <br /> Stockton, California <br /> IT Corporation Project 779962 <br /> Dear Mr DeNinno <br /> This Second Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by IT Corporation at the subject site (Attachment 1, Figure 1) on <br /> April 10, 2002LW <br /> � <br /> A summary of activities conducted during this reporting period is provided below <br /> G 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 /> G 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 /> a (BTEX), methyl-tert-butyl-ether(MTBE), tert-butanol (TBA), diisopropyl ether (DIPS), ethyl-tert- <br /> butyl ether (ETBE), tert-amylmethyl ether(TAME), and total petroleum hydrocarbons-as- <br /> gasoline (TPH-G) <br /> O Soil vapor extraction (SVE) and air sparge testing were performed on April 22, 2002 at wells <br /> MW-4R, MW-7, SPV-1, and SPV-4 Results are being submitted under separate cover <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 /> Corrective Action 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 /> a <br />