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Delta <br /> Environmental E VE 0 <br /> Consultants, Inc. <br /> AUG 2 7 T90 <br /> 3330 Data Drive, Suite 100 <br /> Rancho Cordova, CA 95670 ENVIRONMENTAL HEALTH <br /> 916/638-2085 PERM I T/S E S V I CES <br /> FAX: 916/638-8385 <br /> August 23, 1990 <br /> Mr. Harlin Knoll <br /> San Joaquin County Local Health District <br /> 1601 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Subject: Sludge and Soil Analytical Results from the Concrete Vault <br /> Shell Service Station <br /> 3725 Tracy Boulevard, Tracy, California <br /> Shell WIC No. 204-7884-0901 <br /> Delta Project No. 40-89-012 <br /> Dear Mr. Knoll: <br /> As you have requested, this letter presents the results of investigation work related to the concrete <br /> vault at the subject site. On May 31, 1990, during station reconstruction activities, a flow-through <br /> concrete vault was discovered. The vault measured 6 feet wide, 16.5 feet long, and 4 feet deep, and <br /> was burried approximately 2 feet deep. The vault contained two compartments, an inflow pipe, and <br /> an outflow pipe. No leach lines were present. <br /> On June 4 1990, 13 barrels of sludge and water were pumped from the vault. The vault was then <br /> dismantled and removed on June 5, 1990. The analytical results on samples of the sludge are <br /> enclosed. Although the analytical results did not indicate that the sludge was a hazardous material, <br /> it was manifested and transported as a hazardous material to a Class I disposal facility on <br /> August 17, 1990. <br /> On June 4, 1990, a Delta Environmental Consultants, Inc., geologist collected two soil samples from <br /> the native soil beneath the vault. The former vault location and sampling points are displayed in the <br /> enclosed figure. The samples where collected with a backhoe at each end of the tank excavation, <br /> 8 feet below the ground surface. As requested by the San Joaquin County Local Health District <br /> (County), the samples were shipped to a state-certified analytical laboratory and analyzed for benzene, <br /> toluene, ethylbenzene,xylenes, total petroleum hydrocarbons as gasoline,and organic lead. Analytical <br /> results of all constituents were below method detection limits. The laboratory data sheets are <br /> enclosed. <br /> Practical Solutions to Environmental Concerns <br />