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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 /> Shaw The Shaw Group Inc <br /> January 13, 2003 P-11 <br /> I JAN 1 $ 2003 <br /> 7-Eleven, <br /> Inc Bob o ENVIRONMENT HEALTH <br /> 7- nc I 10220 S W Greenburg Road, Suite 470 REKNIT/SERVICES <br /> Portland, OR 97223 <br /> Subject Fourth Quarter 2002 Monitoring and Sampling Report <br /> 7-Eleven Site No 17334 <br /> 4501 North Pershing Avenue <br />' Stockton, California <br /> Shaw Environmental, Inc Project No 779950 <br /> Dear Mr DeNrnno <br />' This Fourth Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> 9 <br /> activities performed by Shaw Environmental, Inc (Shaw) at the subject site (Attachment 1, Figure 1) on <br /> October 15, 2002 <br />' A summary of activities conducted during this reporting period is provided below <br /> • Depth to water(DTW)was gauged in five site-related groundwater monitoring wells (MW-2, <br /> IMW-3, MW-4, MW-5A, and MW-5B) <br /> • Groundwater samples were collected from five 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), dnsopropyl ether(DIPE), ethyl-tert- <br /> butyl ether(ETBE), tert-amylmethyl ether(TAME), and total petroleum hydrocarbons-as-gasoline <br />' (TPH-G) <br /> Background <br /> ISan Joaquin County Public Health Services (SJCPHS) files indicate that there are three underground storage <br /> tank (UST) sites with documented releases located near 7-Eleven Site No 17334 The Cardlock Gasoline <br />' Station at 4555 N Pershing Avenue (100 feet east and crossgradient of the site), a Shell Service Station at <br /> 4445 N Pershing Avenue (crossgradient of the site), and an Exxon Service Station at 4444 N Pershing <br /> Avenue (crossgradient of the site) Exxon's well MW-9 is located adjacent to the 7-Eleven site property <br /> Iboundary The Cardlock facility was reportedly under investigation for diesel contamination, and received <br /> • no-further-action status in December 1997 The Shell site, according to available information, is due to <br /> receive regulatory agency closure shortly <br /> 17334Q24 QMR DOC <br />