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IT Corporation <br /> 4005 Pori Chicago Highway <br /> Concord, CA 94520-1120 <br /> Tel 925 288 9898 <br /> OltheFax 925 288 0888 <br /> 4t;group. L � AillPrnbrrnIThrIfCraup <br /> December 28, 2000 <br /> Mr Bob DeNinno <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br /> Subject Fourth Quarter 2000 Monitoring and Sampling Report <br /> 7-Eleven Site No 17334 <br /> 4501 North Pershing Avenue <br /> Stockton, California <br /> IT Corporation Project 779950 <br /> Dear Mr DeNinno <br /> This Fourth Quarter 2000 Monitoring and Sampling Report presents the results of monitoring and <br /> sampling activities performed by IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on <br /> November 14, 2000 A summary of activities conducted during this reporting period is provided below <br /> • Depth to water (DTW) was gauged in five site-related groundwater monitoring wells (MW-2, <br /> MW-3, MW-4, MW-5A, and MW5-B) <br /> • Groundwater samples were collected from five monitoring wells and submitted to a <br /> California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), methyl-tert-butyl-ether (MTBE), tert-butanol (TBA), diisopropyl ether (DIPE), ethyl-tert- <br /> butyl ether (ETRE), tert-amylmethyl ether (TAME), and total petroleum hydrocarbons-as- <br /> gasoline (TPH-G) <br /> Groundwater Monitoring Data <br /> Quarterly groundwater monitoring of the wells was performed on November 14, 2000 Before <br /> 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, and the resulting data was used to prepare a potentiometnc surface map (Figure 2) <br /> Based on the potentiometric surface map, groundwater flow is toward the north and northwest at an <br /> approximate gradient of 0 003 foot per foot Groundwater monitoring results for the quarter and <br /> historical monitoring results are presented in Tables 1 and 2, respectively (Attachment 2) Field data <br /> sheets are included in Attachment 3 <br />