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tiY / 5• <br /> M C'orporatio'n <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520-1120 <br /> 0 fel 925 288 9898 <br /> SheFax 925 288 0888 <br /> (tigroup <br /> 0 A 111Pn2bFr of Thf,IT Croup <br /> December 19,2000 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road <br /> Portland, Oregon 97233 <br /> Subject Fourth Quarter 2000 Monitoring and Sampling Report <br /> 7-Eleven Store No 17647 <br /> 1048 West Yosemite Avenue <br /> Manteca, California <br /> IT Corporation Project 781721 <br /> Dear Mr DeNinno <br /> This Fourth Quarter 2000 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 October 13, <br /> 2000 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),total petroleum hydrocarbons-as-gasoline (TPH-G),the oxygenates methyl-tert-butyl-ether <br /> (MTBE),tert-butanol (TBA), dusopropyl ether(DIPS), ethyl-tert-butyl ether(ETBE), and tert- <br /> amylmethyl ether(TAME) <br /> Groundwater Monitoring Data <br /> Groundwater monitoring of the three wells MW-1, MW-2, and MW-3 was performed on October 13,2000 <br /> Before monitoring,the well caps were opened to allow the water in each well to stabilize to atmospheric <br /> pressure The DTW was measured to the nearest 0 01 foot from the top of the well casing using an interface <br /> probe <br /> Groundwater monitoring results for the quarter are presented in Table 1 (Attachment 2) A potentiometric <br /> surface map was prepared using the groundwater elevation data collected on October 13, 2000 (Figure 2) <br /> Based on the groundwater elevation data,groundwater flow is toward the southwest at a gradient of <br /> approximately 0 003 fUft Field data sheets are included in Attachment 3 <br /> 2175684 rpt <br />