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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 /> 1 <br /> RJul EC ENEDD y 29, 2002 <br /> AUG 12 2002 <br /> Mr Bob DeNinno ENVIRONMENT HEALTH <br /> 1 7-Eleven, Inc PERMIT/SERVICES <br /> 10220 S W Greenburg Road, Suite 470 <br />' Portland, OR 97223 <br /> Subject Second Quarter 2002 Monitoring and Sampling Report <br /> 7-Eleven Site No 17334 <br /> 1 4501 North Pershing Avenue <br /> Stockton, California <br /> Shaw E&I Project 779950 <br /> 1 Dear Mr DeNinno <br /> This Second Quarter 2002 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by Shaw Environmental & Infrastructure, Inc (formerly IT Corporation) at the <br /> subject site (Attachment 1, Figure 1) on April 11, 2002 <br /> 1 A summary of activities conducted during this reporting period is provided below <br /> 1 . 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), dusopropyl ether(DIPS), ethyl-tert- <br /> butyl ether(ETBE), tent-amylmethyl ether(TAME), and total petroleum hydrocarbons-as- <br /> gasoline (TPH-G) <br />' Background <br /> San Joaquin County Public Health Services (SJCPHS) files indicate that there are three underground <br />' storage tank(UST) sites with documented releases located near 7-Eleven Site No 17334 the Cardlock <br /> Gasoline Station at 4555 N Pershing Avenue (100 feet east and crossgradrent of the site), a Shell Service <br /> Station at 4445 N Pershing Avenue(crossgradrent of the site), and an Exxon Service Station at 4444 N <br />' Pershing Avenue (crossgradrent of the site) Exxon's well MW-9 is located adjacent to the 7-Eleven site <br /> . property boundary <br /> 1 <br /> I <br />