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IT Corporation <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520 1120 <br /> 0 Tel 925 288 9898 <br /> 1;, Dhe Fdx 925 288 0888 <br /> 1 <br /> (t;group A Member of Ihi If Group <br /> May 10, 2002 <br /> �a y <br /> Mr Bob DeNinno <br /> 1 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> 1 Subject First Quarter 2002 Monitoring, Sampling, and Air Sparge Test Report <br /> 7-Eleven Store No 19976 <br /> 1 1399 North Main Street <br /> Manteca, California <br /> IT Project No 779956 <br /> 1 Dear Mr DeNinno <br /> This First Quarter 2002 Monitoring, Sampling, and Air Sparge Test Report presents the results of <br /> monitoring and sampling activities performed by IT Corporation at the subject site (Figures 1 and 2, <br /> Attachment 1)on January 30, 2002 A summary of activities conducted during this reporting period is <br /> provided below <br /> • Depth to water(DTW)was gauged in ten site-related groundwater monitoring wells MW-1, <br /> 1 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), dnsopropyl ether(DIPS), ethyl-tert-butyl ether(ETRE), and tert-amylmethyl <br /> ether(TAME) <br /> ' 0 Air sparge testing was conducted on February 6, 2002, using sparge well SPA (Figure 2) <br /> ' Monitoring results are for two depth intervals, shallow(about 30 feet below grade) and deep (about 50 feet <br /> below grade) Shallow wells are designated as MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, and MW-7, the <br /> deeper wells are MW-1A, MW-4A, and MW-5A Groundwater elevations are similar in wells screened <br /> ' within both depth intervals, seasonally fluctuating between about 14 to 20 feet below grade(about 7-13 <br /> feet above mean sea level) <br /> r <br /> 1 <br />