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Harding Lawson Aaseoiates <br /> Within 1/4 mile of the site, there are a number of other facilities that <br /> contain underground gasoline storage tanks. Of most concern are the following , . . <br /> three facilities, at which unauthorized releases have recently been documented. <br /> 1, Directly across Grant Line Road from the 7-Eleven facility is an old <br /> gasoline station, now operating as a motorcycle repair shop. Two <br /> �5 gasoline tanks and a waste oil tank were removed, and we understand <br /> from Ms. Laurie Cottula of the SJLHD that at the time of removal, <br /> free product was noted on the ground water within the excavation. To <br /> our knowledge, no further work has been done at this site. <br /> 2. At the corner of Tracy Boulevard arid Grant Line Road, approximately <br /> 1/4 mile west of the 7-Eleven facility, a Mobil gas station recently <br /> had an unauthorized product release. Underground storage tanks at <br /> this facility.were replaced in November 1986. Kaprealian Engineer- <br /> ing, Inc. installed four monitoring wells at the Mobil gas station <br /> t3 and detected 320 parts per million (ppm) of total petroleum hydro- <br /> carbon carbon (TPH) (as gasoline) in the ground water at their monitoring <br /> well nearest the 7-Eleven facility. There has also been a history ofia� <br /> leakage from above groundstorage tanks at the facility. According <br /> to inf oration supplied by the SJLHD, there are no clean-up or remedi- <br /> ation actions currently in progress. <br /> 3. . Jus;: west a the. Mobil gas station a PG&E service yard has exper- <br /> ienced several episodes of underground tank leaks since 1986. Spec- <br /> ific details were not available, but according to SJLHD' officials, <br /> there are currently seven to nine monitoring wells in place. Gaso- <br /> line constituents have been identified in the ground water, and site <br /> i characterization work is in progress. <br /> Informaticn obtained f <br /> r <br /> � rpm the State Department of Water Resources and from14 <br /> - <br /> ka <br /> the'City. of Tracy Utilities Department indicates .that five water wells are <br /> within 1/4 mile of the site (see Plate 2 for locations). One of these, a <br /> domestic well belonging to the City of Tracy, extends to a depth of greater <br /> than :lOQO .feet. The remaining four wells extend deeper than 15Q feet and are <br /> apparently used for irrigation only, <br /> 4' <br />