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' IT Corporation 1005 Pati Chrr ria High ai Concord C 1 Q15201120 • It 1 925 288 9818 1 ax 92.5 288 0888 the (f;group. 1 11rmb,r of Fiji If (ioup ' June 9, 2000 C) Mr Bob DeNinno c-D ' 7-Eleven, Inc C_ 10220 SW Greenburg Road, Suite 470 Portland, Oregon 97223 Subject Second Quarter 2000 Monitoring and Sampling Report 7-Eleven Store No 14117 2725 Country Club Boulevard ' Stockton, California IT Project No 779966 ' Dear Mr DeNinno This Second Quarter 2000 Monitoring and Sampling Report presents the results of activities performed by ' the IT Corporation at the subject site (Figure 1, Attachment 1)on May 16, 2000 A summary of activities conducted during this reporting period is provided below • Depth to water(DTW)was gauged in four site-related groundwater monitoring wells (MW-1 through MW-4) • Groundwater samples were collected from the groundwater monitoring wells and submitted to a California-certified laboratory for analysis for benzene, toluene, ethylbenzene and xylenes (BTEX), total petroleum hydrocarbons-as-gasoline (TPH-G), and the oxygenates, methyl-tert-butyl-ether (MTBE), tert-butanol (TBA), dlisopropyl ether(DIPE), ethyl-tert-butyl ether(ETBE), and tert-amylmethyl ether (TAME) 1 Groundwater Monitoring Data Groundwater monitoring was performed on May 16, 2000 Before monitoring, the well caps were opened to allow the water in each well to stabilize to atmospheric pressure The DTW was measured to the ' nearest 0 01 foot from the top of the well casing using an interface probe Monitoring results from the May 16, 2000 monitoring and sampling event and historical data are presented ' in Table 1 A potentiometric surface map was generated using top of casing elevations and DTW data (Figure 2) Based on the monitoring data, the estimated groundwater flow is generally toward the south at a gradient 0 003 foot per foot Field data sheets are included in Attachment 3 14117/020 RPT