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' IT Corporation <br /> 4005 Port Chicago Highway <br /> Concord, CA 94520-1120 <br /> Tel 925 288 9898 <br /> ,sheA Fax 925 288 0888 <br /> (tirilerouDo A Afemh,r of rh, 17 Grup <br /> su <br /> GC[EC MWE0 <br /> July 9,2001 J U L 1 8 2001 <br /> ENVIROMMEN t HEALTH <br /> Mr Bob DeNinno PERMIT/SERVICES <br /> 7-Eleven, Inc <br /> 10220 S W Greenburg Road, Suite 470 <br /> Portland, Oregon 97233 <br /> Subject Second Quarter 2001 Monitoring and Sampling Report <br /> 1 7-Eleven Site No 20632 <br /> 4627 DaVnci Drive <br /> Stockton, California <br />' IT Corporation Project 779962 <br /> Dear Mr DeNinno <br /> This Second Quarter 2001 Mondonng 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 May <br /> 17, 2001 A summary of activities conducted during this reporting period is provided below <br /> • Depth to water(DTW)was gauged in four site-related groundwater monitoring wells(MW-1,MW- <br /> 2, MW-3, and MW-5) <br /> • Groundwater samples were collected from the monitoring wells and submitted to a <br /> California-certified laboratory for analysis of benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), methyl4ert-butyl-ether(MTBE),tert-butanol (TBA), diisopropyl ether(DIPS), ethyl-tert- <br /> butyl ether(ETBE),tert-amylmethyl ether(TAME), and total petroleum hydrocarbons-as-gasoline <br /> (TPH-G) <br /> IGroundwater Monitoring Data <br /> jBefore 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 potentiometric surface map (Figure 2) <br /> Based on the potentiometric surface map,groundwater flow is toward the south at an approximate gradient <br /> of about 0 004 foot per foot Groundwater monitoring results for the quarter and historical monitoring <br /> results are presented in Tables 1 and 2, respectively(Attachment 2) Field data sheets are included in <br /> Attachment 3 <br />