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x <br /> . g <br /> RECEIVIE`0 <br /> GROUNDWATER ENVIRONMENTAL HEALTH <br /> PERMIT/SER <br /> TECHNOLOGY, INC. �.k,�:L,..concore.cAs3.sso <br /> 14151671--:337 <br /> April 20, 1990 <br /> Job No. 203 175 3289 <br /> Mr. John Randall <br /> Chevron U.S.A. Inc. <br /> 2410 Camino Ramon <br /> Bishop Ranch 16 <br /> San Ramon, CA 94583 <br /> Re: Excavation Soil Pile Sampling Results <br /> Former Chevron Service Station No. 9-0342 <br /> 1374 South El Dorado, Stockton, California <br /> �7 <br /> Dear Mr. Randall: <br /> This letter report summarizes the results and findings of the <br /> excavation at the above-referenced site (Figure 1) . At the time <br /> x of removal of the underground tanks (September 1989) , samples <br /> were collected from the tank excavation by a previous consultant. <br /> Those samples were reportedly taken from a depth of approximately <br /> 15 feet. See Figure 1 for locations of these samples, and <br /> Attachment 1 for summary of the analytical results. The apparent <br /> concentrations of TPH-as-gasoline in those samplj ,r ranged from <br /> nondetectable (ND) to 390 parts per million (pp-m) . <br /> Groundwater Technology, Inc. undertook additional excavation work <br /> on January 29, and February 9, 1990, to remove hydrocarbon- <br /> impacted soils for remedial treatment. All work steps were <br /> performed in accordance with the Groundwater Technology, Ine. 's <br /> Work Plan of November, 1989, approved by the San Joaquin County <br /> Environmental Health Division. <br /> As a result of the excavation, soil was removed to the practical <br /> limits of the equipment. Approximately 600-cubic yards of soils <br /> were removed at the site from the former underground storage-tank <br /> pit and the underground waste-oil fuel-storage tank pit (P-I and <br /> of&es throughout the U.S.,Canada end Ormeds <br />