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' IT Corporation <br /> 4005 Port Chicago ffighway <br /> Concord CA 94.520 1120 <br /> Tel 925 288 9898 <br />;Khe laax 925 288 0888 <br /> (AP&WOUD A Aft robe r of ncc 1 r Gronp <br /> JL <br /> December 17, 2001 /'�I <br /> JAN u 9 ZOOZ <br /> Mr Bob DeNinno <br />' 7-Eleven, Inc ENVIROWENT HEALTH <br /> 3130 S Owyhee Street PERMIT/SERVICES <br /> Boise, Idaho 83705 <br /> tSubject Fourth Quarter 2001 Monitoring and Sampling Report <br /> 7-Eleven Site No 20632 <br /> 4627 DaVinci Drive <br />' Stockton, California <br /> IT Corporation Project 779962 <br />' Dear Mr DeNinno <br /> This Fourth Quarter 2001 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 November <br /> 5, 2001 <br /> The San Joaquin Co Public Health Seances/Environmental Health Department has requested additional <br /> site assessment A workplan for additional site assessment will be submitted in accordance with the <br /> revised deadline (IT Corporation, Inc correspondence September 27, 2001) <br /> tA 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 /> D, 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), methyl-tert-butyl-ether (MTBE), tent-butanol (TBA), dusopropyl ether (DIPE), ethyl-tert- <br /> butyl ether (ETBE), tert-amylmethyl ether(TAME), and total petroleum hydrocarbons-as-gasoline <br /> (TPH-G) <br />' Groundwater Monitoring Data <br /> Before 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 southwest at an approximate <br /> gradient of less than 0 002 foot per foot Groundwater monitoring results for the quarter and historical <br />