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1 fT Corporation <br /> 4005 fort Chicago Hlghwdy <br /> Concord, CA 94520-1120 <br /> TU 925 288 9898 <br />!&hei <br /> Fax 925 288 0888 <br />' <br /> V12'roup A Vernher of the IT Croup - <br /> su <br /> D n ;tl ,7 <br /> July 9, 2001 JUL 1 8 2001 <br />' ENVIRUWEN1 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 />' 7-Eleven Site No 17334 <br /> 4501 North Pershing Avenue <br /> Stockton, California <br />' IT Corporation Protect 779950 <br /> Dear Mr DeNmno <br /> This Second Quarter 2001 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 May <br /> 23, 2001 A summary of actiwbes conducted during this reporting period is provided below <br /> e Depth to water(DTW)was gauged in five site-related groundwater monitoring wells(MW-2, MW- <br /> 3,MW-4,MW-5A, and MW5-B) <br /> a 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), 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 />' Groundwater Mondonng 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 potentometric surface map,groundwater flow is toward the northeast at an approximate <br /> gradient of about 0 006 foot per foot Groundwater monitoring results for the quarter and historical <br />' monitoring results are presented in Tables 1 and 2, respectively(Attachment 2) Field data sheets are <br /> included in Attachment 3 <br /> I <br />