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' IT Corporation 757 Arnold Drive, Suite 1) Martinez, CA 94553-6526 � 7irl. 925.370.3990 the � Fa x. 925.3 70..3 991 � � WOUP A Ah-mbr•r of Thr IT Croup August 30, 1999 Mr. Bob DeNinno ' 7-Eleven, Inc. 10220 SW Greenburg Road, Suite 470 Portland, Oregon 97223 Subject: Third Quarter 1999 Monitor and Sampling Report 7-Eleven Store No. 14117 2725 Country Club Boulevard Stockton, California Dear Mr. DeNinno: ' This Third Quarter 1999 Monitoring and Sampling Report presents the results of activities performed by the IT Corporation at the subject site (Figure 1, Attachment 1) on August 25, 1999. 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 (TPN-G), and the oxygenates, methyl-tert-butyl-ether(MTBE), tert-butanol (TBA), diisopropyl ether (DIPS), ethyl-tert-butyl ether (ETBE), and tert-amylmethyl ether (TAME). Groundwater Monitoring Data Groundwater monitoring was performed on August 25, 1999. 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 August 25, 1999 monitoring and sampling event are presented in Table 1 A potentiometric surface map was generated using top of casing elevations and DTW data collected on August 25, 1999 (Figure 2). Based on the monitoring data, the estimated groundwater flow is toward the east-northeast at a gradient 0.01 foot per foot. Field data sheets are included in Attachment 3. 14117,1T)rr,i