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' IT Corporation <br /> 4005 Port Chicago highway <br /> Concord, CA 945201120 <br /> Tel 92.5 288 9898 <br />�SheA Fax 925 288 0888 <br /> (Wpio2roup A iNemher oL Iht IT Group <br /> December 13, 2001 IN if, _L:�J ty E ID <br /> JAN 0 9 2002 <br />' Bob , Inc <br /> 7- o <br /> Eleven, Inc ENVIRUi'�IlriENT HEALTH <br /> 7- <br /> 3130 S Owyhee Street PERMIT/SERVICES <br /> Boise, Idaho 83705 <br />' Subject Fourth Quarter 2001 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 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 6, <br /> 2001 <br /> The San Joaquin Co Public Health Services/Environmental Health Department has requested additional <br /> site assessment A workplan for additional assessment activities will be submitted in accordance with the <br /> revised deadline (IT Corporation, Inc , correspondence, September 27, 2001) <br /> 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, MW- <br /> 3, MW-4, MW-5A, and MW-5B) <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 (D1PE), 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 potenbometnc surface map (Figure 2) <br />' Based on the potentiometnc surface map,groundwater flow is toward the northeast at an approximate <br /> gradient of about 0 004 foot per foot Groundwater monitoring results for the quarter and historical <br /> I <br /> I <br />