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4005 Port Chicago Highway <br /> Concord, CA 94520 1120 <br /> Tel 925 288 9895 <br /> I've 925 288 0888 <br /> V1*0U1 <br /> A,1lember of The IF(rueep <br /> I . <br /> January 15, 2001 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 SW Greenburg Road, Suite 470 <br /> Portland, Oregon 97223 <br /> Subject Fourth Quarter 2000 Monitoring and Sampling Report <br /> 7-Eleven Store No 14117 <br /> 2725 Country Club Boulevard <br /> Stockton, California <br /> IT Project No 779966 <br /> Dear Mr DeNinno <br /> This Fourth Quarter 2000 Monitoring and Sampling Report presents the results of activities performed by <br /> the IT Corporation at the subject site (Figure 1, Attachment 1) on November 15, 2000 A summary of <br /> activities conducted during this reporting period is provided below <br /> Depth to water (DTW) was gauged in four site-related groundwater monitoring wells (MW-1 <br /> through MW-4) <br /> Groundwater samples were collected from the groundwater monitoring wells and submitted <br /> to a California-certified laboratory for analysis for benzene, toluene, ethylbenzene and <br /> xylenes (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G), and the oxygenates, <br /> methyl-tert-butyl-ether (MTBE), tent-butanol (TBA), diisopropyl ether (DIPE), ethyl-tert-butyl <br /> ether (ETBE), and tert-amylmethyl ether (TAME) <br /> I <br /> Groundwater Monitoring Data <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 <br /> interface probe Quarterly results and historical data are presented in Table 1 A potentlometric surface <br /> map was generated using quarterly top of casing elevations and DTW data (Figure 2) Based on the <br /> monitoring data, the estimated groundwater flow radiates from the underground storage tank pit to the <br /> northeast, east, and south at a gradient of about 0 0006 foot per foot Field data sheets are included in <br /> Attachment 3 <br /> 14117040 RFT <br />