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' IT Corporation 4005 Port Chicago Highway ' Concord, CA 94520-1120 Tel 925 288 9898 *hetigroup. FAX 92s las ossa A Hember of The If Group 1r� March 30, 2041 ' Mr Bob DeNinno 7-Eleven, Inc ' 10220 S W Greenburg Road, Suite 470 Portland, Oregon 97233 .� r-� Subject First Quarter 2001 Monitoring and Sampling Report ' 7-Eleven Site No 17334 4501 North Pershing Avenue Stockton, California IT Corporation Project 779950 ' Dear Mr DeNinno This First Quarter 2001 Monitoring and Sampling Report presents the results of monitoring and sampling activities performed by IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on February 6, 2001 A summary of activities conducted during this reporting penod is provided below i a Depth to water(DTW)was gauged in five site-related groundwater monitoring wells (MW-2, ' MW-3, MW-4, MW-5A, and MW5-B) V Groundwater samples were collected from five monitoring wells and submitted to a California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes ' (BTEX), methyl tert-butyl-ether(MTBE), tert-butanol (TBA), dusopropyl ether (DIPE), ethyl-tert- butyl ether(ETRE), tert-amylmethyl ether(TAME), and total petroleum hydrocarbons-as- gasoline (TPH-G) ' 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, and the resulting data was used to prepare a potentiometric surface map (Figure 2) Based on the potentiometnc surface map, groundwater flow is toward the northeast at an approximate gradient of about 0 004 foot per foot Groundwater monitoring results for the quarter and historical ' monitoring results are presented in Tables 1 and 2, respectively (Attachment 2) Field data sheets are included in Attachment 3