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SEQUOIA ANALYTICAL 4 JUL _ 8 1992 <br /> 1900 Bates Avenue • Suite LM Concord, California 9 520 <br /> (510) 686-9600 0 FAX (510) 686-9689 <br /> Alton Geoscience Client Project ID Mobil #o4-NP4/30-0140-02 Sampled Jun 25, 1992 <br /> 5870 Stoneridge Drive, Suite 6 Sample Descnpt Water, E-1 Received Jun 25, 1992 <br /> Pleasanton, CA 94588 Analysis Method EPA 5030/8015/8020 Analyzed Jun 26, 1992 <br /> Attention Cyril Yong Lal)Number 206-1189 Reported Jul 2, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS WITH BTEX DISTINCTION (EPA 8015/8020) <br /> Analyte Detection Limit Sample Results <br /> Ng/L (ppb) j►g/L (ppb) <br /> Low to Medium Boiling Point Hydrocarbons ... 30 N D <br /> Benzene 030 N D <br /> Quene..............................i....... ............ ,,,.,H..,.,.--* <br /> Ethyl enzene 030 N D <br /> Xylenes 030 <br /> I <br /> Low to Medium Boiling Point Hydrocarbons are quantitated against a gasoline standard <br /> Analytes reported as N 0 were not present above the stated limit of detection <br />• SEQUOIA ANALYTICAL <br /> .e-)& - <br /> Scott A Chieffo 2WI189ALT <1> <br /> Project Manager <br />