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IT Corporation 4005 fort Chicago 1hghsvdy Concord, CA 94520-1120 ® 7el 925 288 9898 I 6dx 925 288 0888 he ® A,1funhrr of 1 he l f(.roup ' March 30,2001 ' Mr Bob DeNinno 7-Eleven, Inc 10220 SW Greenburg Road, Suite 470 , Portland, Oregon 97223 ' Subject First Quarter 2001 Monitoring and Sampling Report 7-Eleven Store No 14117 2725 Country Club Boulevard Stockton, California IT Project No 779966 ' Dear Mr DeNinno This First Quarter 2001 Monitoring and Sampling Report presents the results of activities performed by the IT Corporation at the subject srte (Figure 1,Attachment 1) on February 7, 2001 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), diisopropyl ether (DIPE), ethyl-tert-butyl ether(ETBE), and tert-amylmethyl ether(TAME) , 1 Groundwater Monitoring Data 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 Quarterly results and historical data are presented in Table 111 A, respectively A potentiometric surface map was generated using quarterly top of casing elevations and DTW data (Figure 2) Based on the monitoring data,the estimated groundwater flow is to the southwest at a gradient of about ' 0 002 foot per foot Field data sheets are included in Attachment 3 14117Q11 RPT