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s � J!F 1 —Sr0 FF? I 1 S = 0 ', DELTr--:�i E N1-4 I FR0NME=—V-1T P _ 0 The pipe will be placed in the ground during the week of June 4 or .lune 11, i990. If you Dave any questions, please call me or Lee Brennan at (916) 638-2085. Sincerely, DELTA li;l'VIRONAENTAIL CONSMLTANTS, TNC, 1 James R Brownell MydrogeologistlProject Manager ? 3�2,B.ecd Enclosures cc,cnc: Mr. Ray Newsome, Shell Coil Company Ni-. Diane Lundquist, Shell Oil tympany June 1, IM Mr. duce Tripp, Filmer Construction, inc. Mr. Harlem Knoll San Joaquin County Local Health District 1601 East Hazelton Avenue Stockton, Cdaliforma 991 Subject: Soil Remediation, Shell Service Station 3725 Tracy Boulevard, Tracy, California Shell' WIC No. 204-78U-0901 � Delta Project No. 40-89-012 Dear Mr. Xnoil: Approximately 400 cubic yards of soil containing petroleum hydrocarbons have been excavated at the subject site and transported to disposal facilities. The soil has been removed from the f6rmer and new product storage tank locations and from the former pump island locations. Soil located below the surface to a depth of approximately 9 feet and determined to contain petroleum constituents has beta removed. however, petroleum constituents have been identified in soil at the water table, approximately 10 feet below the surface. The enclosed 0gure displays the soil sampling points where petroleum coir auents have been identified at the water table. Based on these data, it is )~Delta Environmental Consultants, Inc.,opinion that dke soil at the water table beneath much of the northeastern portion of the site contains petroleum constituents, Site remediation will take place following acceptance by San Joaquin County of a Preliminary Report, a Problem Assessment Report, and a Final Remedial Plan. Howcver, to reduce site disruption later (pavement removal and trenching in the vicinity of future product lines), we will be installing ground water gradient control pipe and soil vent pipe now. These pipes will becoine part of a system incorporating ground water gradient control and soil vapor extraction. This system will be proposed a in detail in a Final Remedial flan and operated only after County approval of the plan. The enclosed figures display the pipe locations and configurations. A perforated pipe placed in a trench at 13 feet below the surface and connected to a sump will later be used to lower the water table. This will allow remediation of the soil containing petroleum constituents by vapor extraction through a slotted pipe placed in the same trench at 9 feet. Practical soiutiors to Envuorr^.entai C,.n:cerns .-_