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(:4j) SEQUOIA ANALYTICAL JUL 8 1992 <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> 1%Q0r (510) 686-9600 * FAX (510) 686-9689 <br /> Alton Geoscience Client Project ICS Mobil #04-NP4/30-0140-02 Sampled Jun 25, 1992 <br /> 5870 Stoneridge Drtve, Suite 6 Matrix Descript Water Received Jun 25, 1992 <br /> Pleasanton, CA 94588 Analysls Method EPA 3510/8015 Extracted Jun 29, 1992 <br /> Attention Cyril Yong First Sample # 206-1189 Analyzed Jun 30, 1992 <br /> Reported Jul 2, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS (EPA 8015) <br /> Sample Sample High B P. <br /> Number Description Hydrocarbons <br /> rug/L <br /> (ppb) <br /> 206-1189 E-1 N D <br /> Detection Limits, 30 <br /> High Boiling Point Hydrocarbons are quantitated against a diesel fuel standard <br /> Analytes reported as N D were not present above the stated Writ of detection <br /> SEQUO ANALYTICAL <br /> S tt A Chleffo M61189.ALT a2> <br /> Project Manager <br />