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SEQUOIA ANALYTICAL <br />2549 Middlefield Road <br />Redwood City, CA 94063 • (415) 364-9222 • FAX (415) 364-9233 <br />Chevron U.S.A. Inc. <br />P.O. Box 5004 <br />San Ramon, CA 94583-0804 <br />Attn: Ron Beffa <br />BTEX DISTINCTION <br />Sample Sample <br />Number Description Benzene Toluene <br />Soil ppm ppm <br />8100407 86 7.5 44 <br />8100410 89 N.D. N.D <br />Date Sampled: 10/06/88 <br />Date Received: 10/07/88 <br />Date Analyzed: 10/07/88 <br />Date Reported: 10/11/88 <br />Project: BTS 888280M1, Chevron <br />84054, Stockton <br />Ethyl <br />Benzene Xylenes <br />ppm ppm <br />17 96 <br />N.D. N.D. <br />Detection Limits: 0.05 0.1 0.1 0.1 <br />Method of Analysis: EPA 5030/8020 <br />Analytes reported as N.D. were not present above the stated limit of detection. <br />SEQUOIA ANALYTICAL LABORATORY <br />Arthur G. Burton <br />Laboratory Director <br />