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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686 9600 • FAX (510) 686-9689 1 U N 5 1992 <br /> Alton Geoscience Client Project ID Mobil #04-NP4/30-0140-02 Sampled Jun 4, 1992 <br /> 5870 Stoneridge Drive, Suite 6 Sample Descript Water, E-1 Received Jun 4, 1992 <br /> Pleasanton, CA 94588 Analysis Method EPA 5030/8015/8020 Analyzed Jun 5, 1992 <br /> Attention Cyril Yong Lab Number 206-0161 Reported Jun 12, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS WITH BTEX DISTINCTION (EPA 8015/8020) <br /> Analyte Detection Limit Sample Results <br /> N9/L (Ppb) pg/L(ppb) <br /> Low to Medium Boiling Point Hydrocarbons 30 N D <br /> Benzene 0 30 N D <br /> Toluene 030 N D <br /> Ethyl Benzene 030 N D <br /> Xylenes 030 N D <br /> Low to Medium Boding Point Hydrocarbons are quantitated against a gasoline standard <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL. <br /> R <br /> Scott A Ch o <br /> Project Manager 2WO161.ALT <1> <br />