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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord California 94520 <br /> (510) 686 9600 • FAX (510) 686 9689 <br /> Alton Geoscience Orent Project ID Mobil #10-NP4/30-0140-02 Sampled Mar 25, 1992 <br /> 5870 Stoneridge Rd , Supe 6 Matrix Descrnpt Water Recerved Mar 26, 1992 <br /> Pleasanton, CA 94588 Analysis Method EPA 5030/8015/8020 Analyzed Mar 27, 1992 <br /> Attention Stephan Rosen First Sample # 203-1183 Reported Apr 2, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS with BTEX DISTINCTION (EPA 8015/8020) <br /> Sample Sample Low/Medium 0 P. Ethyl <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes <br /> N9/L Fig/L Ng/L Ng/L Fig/L <br /> (ppb) (ppb) (ppb) (ppb) (ppb) <br /> 203-1183 MWt ND ND ND ND ND <br /> 203-1184 MM 240 42 18 080 38 <br /> 203-1185 MW N D N D N D N D N D <br /> 203-1186 AMW2 N D N D N D N D N D <br />• 203-1187 AMW3 N D N D N D N D N D <br /> 203-1188 AMW4 N D N D N D N D N D <br /> 203-1189 AMW5 72 48 N D N D N D <br /> 203-1190 AMwt N D N D N D N D N D <br /> 203-1191 MW4 1,400 500 40 210 320 <br /> 203-1192 Mwe 1,400 19 66 140 230 <br /> Detection Limits 30 030 0 30 030 030 <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 /> OEQUOIA ANALYTICAL <br /> Scott A Chieffo <br /> Project Manager 2a31193-ALG <t> <br />