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1 Shaw Environmental & Infrastructure, Inc <br /> 4005 Port Chicago Highway <br /> i Concord, CA 94520-1120 <br /> 925 288 9898 <br /> Fax 925 288 0888 <br /> IShaW The Shaw Group Inc TM <br /> I R E' I E�W E DD <br /> July 30, 2002 AUG 0 9 2002 <br /> ENVIRONMENT HE,-iL,rH <br /> PERMIT/SERVICES <br /> ' Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> Subject Second Quarter 2002 Monitoring, Sampling, and Interim Remediation Report <br /> ' 7-Eleven Store No 19976 <br /> 1399 North Main Street <br /> Manteca, California <br /> Shaw E&I Project No 779956 <br /> tDear Mr DeNinno <br /> This Second Quarter 2002 Monitoring, Sampling, and Interim Remediation Report includes the results of <br /> monitoring and sampling activities performed by Shaw Environmental & Infrastructure, Inc at the subject <br /> ' site(Figures 1 and 2, Attachment 1) on April 4, 2002 A summary of activities conducted during this <br /> reporting period is provided below <br /> ' • Depth to water(DTW) was gauged in ten site-related groundwater monitoring wells (MW-1, <br /> MW-1A, MW-2, MW-3, MW-4, MW-4A, MW-5, MW-5A, MW-6, and MW-7) <br /> • Groundwater samples were collected from the monitoring wells and 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), methyl-tert-butyl-ether(MTBE), tert- <br /> butanol (TBA), dusopropyl ether(DIPE), ethyl-tert-butyl ether(ETBE), and tert-amylmethyl <br /> ' ether(TAME) <br /> • Air sparge testing was conducted on May 23, 2002, using well MW-1A (Figure 2) Soil vapor <br /> ' extraction (SVE)was conducted on June 6, 2002, using the horizontal vent wells <br /> Background <br /> ' The site is an active 7-Eleven facility that dispenses gasoline The San Joaquin County Public Health <br /> Services (SJCPHS) has indicated that remediation will be required based on site levels of methyl tertiary <br /> ' butyl ether(MTBE) Specific site cleanup goals have not yet been established by the SJCPHS <br />