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' Chwron <br /> a Chevron <br /> Chevron U.SA Products Company <br /> 6001 Bollinger Canyon Rd, Bldg L <br /> MAY PO Box 5004 <br /> San Ramon CA 94583-0804 <br /> ENVIRONMENTAL HEALTH Site Assessment& Remediation Group <br /> May 18, 1995 PERMIT/SERVICES Phone(510)642-9500 <br /> Mr Hard A.Knol1 <br /> San�oacluin County Environmental Health Department <br /> P O Box 2009 <br /> Stockton, CA 95201 <br /> Re Former Chevron Station #9-8532 575 West Grant Line Road,Tr-acy, CA <br /> Attached Oveiexcavattoil and Soil Remediation Report(Touchstone, 5112195) <br /> Dear Mr Knoll <br /> Attached you will find a report dated May 12, 1995, which was prepared by Chevron's consultant, <br /> Touchstone Developments (Touchstone), to describe the procedures and results obtained during <br />• soil excavationhemedtation activities that were pciformed at the subject site in August, 1994 <br /> Overexcavation was pciformed to remediate hydrocarbon impacted soils that were previously <br /> identified at the former waste oil tank and garage floor sump areas during the service station <br /> abandonment in May, 1994 Further excavation was pciformed as exploratory trenching in areas of <br /> the former pump islands and in areas evending out from the sides of the fonner fuel tankpit <br /> Soil analytical results from the former waste oil tank/sump excavation indicated that residual <br /> hydrocarbons a% TPHGas, BTEX, and oil and grease remain in soils The results reported the <br /> presence of TPHDiesel as «ell, however, the chromatographic pattern for these samples indicated <br /> that the signatuic was that of a nem-diesel mw Since diesel fuel was not supplied at this station, it <br /> is suspected that the non-diesel pattern actually repiesents degraded (weathered) gasoline The <br /> greatest c.oneenti attons of hydi ocai bons remaining were detected in soils at 7 feet or deeper and are <br /> thought to be associated with the capillary fringe The extent of this contamination could not be <br /> inferred therefore, e\caN anon «as discontinued <br /> Results of the ticixliino indicated the presence of hydrocarbons in soils beyond the immediate <br /> areas of the forniei puivp islands and fuel tank pits No further excavation was performed at these <br /> areas since the e\tcnt of contamination was not defined <br /> Approximately 350 cubic, yards of soil were excavated from the former waste oil tank/sump area <br /> These soils «ere chaiactei iced by Touchstone and were hauled to Forward Landfill for disposal <br /> Soils generated dui ing trench excavations wcie stockpiled and later combined for aeration with <br /> stockpiled nwciial florae the original tank removal in May, 1994 At the completion of aeration <br /> activities all soil (appio\ 300 cubic yds ) w s reused onsite as backfill material <br /> Further deftni[ion of soil and groundwater contamination beneath the subject site will be obtained <br /> during upcoming invcstigalion acts\ities to be performed by Chevron's consultant, Groundwater <br /> st t <br /> Y, <br />