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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 /> ' July 25, 2002 RECOVED <br /> AUG 0 1 2oa2 <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 and Sampling Report and Request for Closure <br /> 7-Eleven Store No 17647 <br /> 1048 West Yosemite Avenue <br /> Manteca, California <br /> Shaw E&I Project 781721 <br /> ' Dear Mr DeNinno <br /> This Second Quarter 2002 Monitoring and Sampling Report and Request for Closure presents the results <br /> of monitoring and sampling activities performed by Shaw Environmental & Infrastructure (formerly known <br /> as IT Corporation) at the subject site (Attachment 1, Figure 1) on April 8, 2002 Based on the summary of <br /> site information, closure is requested at this time Monitoring for the third quarter 2002 will be postponed <br /> ' until site status relative to closure has been verified with the lead regulatory agency (the San Joaquin <br /> County Public Health Services Department (SJCPHS) Additional site assessment data verifying closure <br /> applicability was submitted on April 24, 2002 <br /> 1 A summary of activities conducted during this reporting period is provided below <br /> ' • Depth to water (DTW)was gauged in three site-related groundwater monitoring wells <br /> • Groundwater samples were collected from the three monitoring wells and submitted to a <br /> ' California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX) (EPA Method 8020), total petroleum hydrocarbons-as-gasoline (TPH-G) (EPA Method <br /> 8015), oxygenates methyl-tert-butyl-ether(MTBE), tert-butanol (TBA), diisopropyl ether(DIPS), <br /> ' ethyl-tert-butyl ether(ETBE), tert-amylmethyl ether(TAME), ethylene dibromide (EDB), and <br /> 1,2-dichloroethane (1,2-DCA) (EPA Method 8260) <br /> ,-Background <br /> ( There are no active fueling facilities at this location On December 4, 1998, two 10,000-gallon and one <br /> 16,000-gallon single-wall steel underground storage tanks (USTs) were removed from the site Six soil <br /> samples were collected from beneath the ends of the USTs at depths of 14 feet below grade (bg), and two <br /> • side wall samples were collected at depths of 6 feet bg, at the direction of SJCPHS (IT Corporation, <br /> 0 <br /> January 1999) <br />