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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 /> 1 Shaw The Shaw Group Inc " <br /> ' October 29, 2002 f-C-)) <br /> NOV 1 2 zoaz <br /> i Mr Bob DeNinno <br /> 7-Eleven, Inc ENVIROK'N'�ItI4: r��A�-TFI <br /> 10220 S W Greenburg Road, Suite 470 PERMIT/SERVICES <br />' Portland, OR 97223 <br /> Subject Third Quarter 2002 Monitoring and Sampling Report <br /> i 7-Eleven Site No 17334 <br /> 4501 North Persuing Avenue <br /> Stockton, California <br />' Shaw Environmental, Inc Project No 779950 <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 five site-related groundwater monitoring wells (MW-2, <br /> MW-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), diisopropyl ether(DI PE), ethyl-tert- <br /> butyl ether (ETBE), tert-amylmethyl ether (TAME), and total petroleum hydrocarbons-as-gasoline <br /> (TPH-G) <br />' Background <br /> San 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 Smell Service Station at <br /> 4445N 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 /> boundary The Cardlock facility was reportedly under investigation for diesel contamination, and received no <br /> 1 further action in December 1997 Available SJCPHS records indicate the Cardlock facility did not conduct <br /> • analysis for MTBE or other oxygenates The Shell site, according to available information, is due to receive <br />' regulatory agency closure shortly <br />' 17334023 QMR DOC <br />