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' IT Corporation <br /> 400.5 fort Chic igo flighua)' <br /> Concord, Crl 94510-1110 <br /> Tel 915 288 9898 <br /> Fax 915188 0888 <br /> / U�L F �(j <br /> 6 <br /> 4 <br /> A Alemhrr of Thi I f Group <br /> the <br /> 1 P <br /> March 6, 2000 <br /> 1 <br /> Mr Bob DeNinno <br />' 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br />' Subject First 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 First Quarter 2000 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities performed by IT Corporation at the subject site (Figures 1 and 2, Attachment 1) on February 2, <br /> 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 <br /> i <br /> (MW-2 through MW-4 and wells MW-5A and MW5-B) <br />' ■ Groundwater samples were collected from five monitoring wells (MW-2, MW-3, MW-4, MW-5A <br /> and MW-5B) and submitted to a California-certified laboratory for analysis of benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), methyl-tert-butyl-ether(MTBE), tert-butanol (TBA), <br /> diisopropyl ether(DIPE), ethyl-tert-butyl ether(ETBE), tert-amylmethyl ether(TAME), and total <br />' petroleum hydrocarbons-as-gasoline (TPH-G) <br />' Groundwater Monitoring Data <br /> Quarterly groundwater monitoring of the wells was performed on February 2, 2000 Before monitoring, the <br />' well caps were opened to allow the water in each well to stabilize to atmospheric pressure The DTW was <br /> measured to the nearest 0 01 foot from the top of the well casing using an interface probe, and the <br /> resulting data was used to prepare a potentiometric surface map (Figure 2) Based on the potentiometnc <br />' surface map, groundwater flow is toward the northeast at an approximate gradient of 0 004 foot per foot <br /> Groundwater monitoring results for the quarter and historical monitoring results are presented in Tables 1 <br /> and 2, respectively (Attachment 2) Field data sheets are included in Attachment 3 <br /> 1 <br />