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Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT • C05TA MESA • SACRAMENTO • HOUSTON <br /> av <br /> Job No.12 <br /> 12-1 <br /> Mr. David Brent APR 7 4983 <br /> California Regional Water <br /> Quality Control Board ENVIROMENTAL HEALTH <br /> Central Valley Region FERMIT/SERVICES <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> Subject: Application for permission to conduct one-time <br /> treatment of contaminated soil at North Cal <br /> Construction Yard, 221 North Cardinal Street, Stockton, <br /> California. <br /> Mr. Brent: <br /> Applied GeoSystems, at the request of UNOCAL Corporation, <br /> requests permission to transport approximately 300 cubic yards of <br /> soil excavated from a former service station in Stockton to the <br /> above-referenced site. The soil was derived from excavation <br /> below two former gasoline storage tanks at the former UNOCAL <br /> service station located at 1665 Pacific Avenue in Stockton. The <br /> service station site location is indicated on the attached Site <br /> Vicinity Map, Plate P-1. <br /> The soil was found to contain low levels of gasoline <br /> contamination after excavation. The highest levels detected in <br /> composite samples are 26 parts per million (ppm) total petroleum <br /> hydrocarbons (modified Environmental Protection Agency Method <br /> 8015) and 0. 21 ppm benzene. The San Joaquin Local Health <br /> Department has stated that they will not allow disposal of the <br /> soil without treatment to less than method detection limits by <br /> aeration. Because there is insufficient space on the site to <br /> treat the soil effectively, and the presence of the soil <br /> interferes with the contractor's ability to backfill the tank <br /> excavation, transport to an alternate site for treatment is a <br /> desirable option. <br /> We propose to spread soil at North Calls construction yard in <br /> Stockton and aerate it until hydrocarbon constituents are below <br /> action levels. Composite samples will be collected from the soil <br /> and analyzed to ensure that these levels are not exceeded. After <br /> treatment the soil will be used or disposed of in accordance with <br /> regulatory guidelines. <br />