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IT Corporation <br /> 4005 Port Chicago 1119IMay <br /> Concord, CA 94520-1110 <br /> Tel 925 288 9898 <br /> Fax 925 288 0888 <br /> i0the(4rigiroupA Afember of Tlae If Cmeep <br /> January15, 2001 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, OR 97233 <br /> Subject Fourth Quarter 2000 Monitoring and Sampling Report -P <br /> 7-Eleven Store No 19976 <br /> 1399 North Main Street <br /> Manteca, California (_n <br /> IT Project No 779956 <br /> Dear Mr DeNinno <br /> This Fourth Quarter 2000 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on <br /> October 12, 2000 A summary of activities conducted during this reporting period is provided below <br /> • Depth to water (DTW) was gauged in seven site-related groundwater monitoring wells MWA, <br /> MWAA, MW-2, MW-4, MW-4A, MW-5 and MW-5A <br /> • Groundwater samples were collected from the seven monitoring wells and submitted to a <br /> California-certified laboratory for analysisethylbenzene and total <br /> of benzene, toluene, <br /> xylenes (BTEX),total petroleum hydrocarbons-as-gasoline (TPH-G), methyl-tert-butyl-ether <br /> (MTBE),tent-butanol (TBA), diisopropyl ether (DIPE), ethyl-tert-butyl ether (ETBE), and tert- <br /> amylmethyl ether (TAME) <br /> Monitoring results are for two depth intervals, shallow (about 30 feet below grade) and deep (about 50 <br /> feet below grade) Shallow wells are designated as MW-1, MW-2, MW-3, MW-4, and MW-5, the deeper <br /> wells are MW-1A, MW-4A, and MW-5A Groundwater elevations are similar in wells screened within <br /> both depth intervals, seasonally fluctuating between about 14 to 17 feet below grade (about 17 - 14 feet <br /> above mean sea level) <br /> Additional subsurface assessment activities conducted during the quarter included a soil-gas survey, <br /> drilling and sampling (soil and groundwater) one soil boring, and drilling and installation of one offsite, <br /> downgradient monitoring well, MW-7 Methods and results of these activities will be presented in a <br /> separate report Well MW-7 has been surveyed, and will be monitored and sampled during first quarter <br /> 2001 <br />