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IT Corporation <br /> 4005 foil Chu ip) I hOilt li <br /> Concord f t 91520 11 0 <br /> T 1 92 a 288 9895 <br /> . � Fix 925 288 0888 <br /> igrouI Wernh,f of 7h, IF(nmp <br /> ' P <br />' June 9, 2000 <br /> Mr Bob DeNinno <br />' 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br /> Subject Second 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 DeN,nno <br /> This Second 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 /> May 16, 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 /> (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-58) 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 (ETRE), 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 May 16, 2000 Before monitoring, the <br /> well caps were opened to allow the water m 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 potentiometric <br /> surface map, groundwater flow is toward the northeast at an approximate gradient of 0 003 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 />