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SEQUOIA ANALYTICAL <br /> 1900 Hates Avenue a Suite LM e Concord California 94520 <br /> �510) 666 9600 e FAX 1510} 686 9689 <br /> Alton Geoscience Client Project ID Mobil #04-NP4/ 30-0140-02 Sampled May 27, 1992 <br /> 5870 Stoneridge Drive, Suite 6 Matrix Descript Water Received May 27, 1992 <br /> Pleasanton, CA 94588 Analysis Method EPA 5030/8015/8020 Analyzed May 28, 1992 <br /> Attention Cyril Yong First Sample # 205-1242 Reported May 29, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS with BTEX DISTINCTION (EPA 8015/8020) <br /> Sample Sample Low/Medium B P Ethyl <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> ug/L ug/L ug/L ug/L ug/L <br /> (ppb) (ppb) (ppb) (ppb) (ppb) <br /> 205-1242 Ft N D N D 032 N D N D <br /> 205-1243 E-1 ND ND ND ND ND <br /> Detection Limits: 30 030 0 30 030 0 30 <br /> Low to Medium Boiling Point Hydrocarbons are quantitated against a gasoline standard <br /> Anaiytes reported as N D were not present above the stated lima of detection <br /> SEQUOIA ANALYTICAL <br /> Scott A Chtef#o 2051242 ALT <1> <br /> Project Manager <br />