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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> v .< <br /> : ..: <br /> Alton Geosclence Client Project ID. Mobil#43 343/ 30-0136-01 Sampled: Apr 7. 1992 <br /> 5870 Stoneridge Drive, Sulte 6 Matrtx Descript: Water Received: Apr 8, 1992 <br /> Pleasanton, CA 94588 Analysis Method. EPA 5030/8015/8020 Analyzed: 4/94/10 <br /> `Attention: Stephan Rosen First Sample #: 204-0230 Reported: Apr 16, 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 /> p9/L Pg/L Pg/L pg/L pg/L <br /> (ppb) (ppb) (pleb) (ppb) (ppb) <br /> 204-0230 AW-t N.D. N.D. N.D. N.D. N.D. <br /> 204-0231 AW-2 N.D. N.D. N.D. N.D. N.D. <br /> 204.0233 AW-4 N.D. N.D. N.D. N.D. N.D. <br /> 204-0234 AW-5 N.D. N.D. N.D. N.D. N.D. <br /> 204-0235 AW-6 N.D. N.D. N.D. N.D. N.D. <br /> 204-0236 AW-7 N.D. N.D. N.D. N.D. N.D. <br /> 204-0237 AW-8 N.D. N.D. N.D. N.D. N.D. <br /> Detection Limits: 30 0.30 0.30 0.30 0.30 <br /> Low to Medium Boiling Point Hydrocarbons are quantitated against a gasoline standard. <br /> Analytes reported as N.O.were not present above the stated limit of detection. <br /> SEQUOIA ANALYTICAL <br /> Belinda C.Vega <br /> Laboratory Director <br /> ZWW0J1LT <1> <br />