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IT Corporation <br /> 4005 Port Chicago Might-V <br /> Concord CA 94 320 1120 <br /> TU 925 388 9898 <br /> Fay 925 388 0888 <br /> V�12roup 1 tlerulu r of The. IF Croup <br /> 1 <br /> 1 <br /> December 27, 1999 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br />' 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> Subject Fourth Quarter 1999 Monitoring and Sampling Report <br />' 7-Eleven Store No 19976 <br /> 1399 North Main Street <br /> Manteca, California <br /> IT Project No 779956 <br /> Dear Mr DeNEnno <br /> This Fourth Quarter 1999 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on November 4, <br /> a <br /> 1999 A summary of activities conducted during this reporting period is provided below <br /> J <br /> ■ Depth to water (DTW) was gauged in eight site-related groundwater monitoring wells MW-1, <br />' MW-1A, MW-2, MW-3, MW-4, MW-4A, MW-5 and MW-5A <br /> ■ Groundwater samples were collected from the eight monitoring wells and submitted to a California- <br /> certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes (BTEX), total <br /> petroleum hydrocarbons-as-gasoline(TPH-G), methyl-tert-butyl-ether (MTBE), tert-butanol (TBA), <br /> dnsopropyl ether(DIPE), ethyl tert-butyl ether(ETRE), and tertamylmethyl ether(TAME) <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, and MW-5, the deeper wells <br /> are MW-1A, MW-4A, and MW-5A Groundwater elevations are similar in wells screened within both depth <br />' intervals, equilibrating at about 14 to 17 feet below grade (about 17- 14 feet above mean sea level, <br /> respectively) <br /> I <br /> I <br /> �4 <br /> I <br />