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Chevron <br /> . . p �.. A _ o,■ [heron <br /> P11 2-- 23 <br /> Chevron U.S.A.Products Company <br /> 2410 Camino Ramon <br /> November 30, 1993 San Ramon,CA 94583 <br /> Marketing Department <br /> Phone 510 842 9500 <br /> Mr. Michael Collins <br /> San Joaquin County Environmental Health <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Re: Former Chevron Station #9-5490 1246 E. Harding Way, Stockton CA <br /> Attached hoist removal and excavation report(Touchstone, 11122193) <br /> Attached verification of waste oil stockpile acceptance,Forward Landfill <br /> Dear Mr. Collins: <br /> Attached is a report, dated November 22, 1993, which was prepared by Chevron's consultant, <br /> Touchstone Developments (Touchstone), to describe soil remediation and sampling that was <br /> performed in association with the removal of hydraulic hoists at the subject site. <br /> Three hydraulic hoists were removed on September 3, 1993. Soil samples collected at the bottom <br /> of each hoist were analyzed for the presence of oil and grease. Sample H-2-7 indicated that 99 ppm <br /> oil and grease remained in soil at 7 feet below surface under the middle hoist. No detectable <br /> concentrations of oil and grease were measured beneath the remaining two hoists. <br /> On October 8, 1993 all hydrocarbon impacted soil beneath the middle hoist was removed by <br /> excavation. Complete removal was confirmed by soil sample H-2-8. The stockpile (c5 cu. yds.) � r <br /> generated during this work was accepted for disposal at Forward Landfill, Stockton, CA. <br /> As a result of the hoist excavation work, there remains no further soil contamination beneath the <br /> subject site. It seems appropriate at this time to recommend this site for case closure. Do you 4 <br /> concur? <br /> To assist in your review of this site for case closure, the following chronology is provided. <br /> 1126193: Removal of all underground storage tanks and lines <br /> 2122/93: Underground Storage Tank and Line Removal Report,Touchstone Developments <br /> 411193: Waste Oil Stockpile hauled to Forward Landfill for disposal (see attached) y <br /> 4130193: Hydrocarbon impacted soils excavated from piping, island, and tankpit areas <br /> 6119193: Begin remediation of all excavated soil by onsite aeration <br /> 8/10193: Soil Excavation and Remediation Report,Touchstone Developments <br /> 8/13/93: Begin backfilling all excavations with aerated soil <br /> 9/3/93: Removal of three hydraulic hoists <br /> 10/8/93: Hydrocarbon impacted soil excavated from beneath middle hoist <br /> 11/22/93: Hoist Removal and Excavation Report,Touchstone Developments <br />