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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921 9600 • FAX (916) 921-0100 <br /> Brown &Caldwell Client Project ID Arco#2133, Stockton Sampled Jul 22, 1992 <br /> 723 S St Matrix Descript Water Received Jul 22, 1992 <br /> Sacramento, CA 95814 Analysis Method EPA 5030/8015/602 Analyzed Jul 27, 1992 <br /> Attention Steve Misner First Sample # 207-0441 Reported Jul 29, 1992 <br /> TOTAL PETROLEUM FUEL HYDROCARBONS with BTEX DISTINCTION (EPA 8015/602) <br /> Sample Sample Low/Medium B.P Ethyl Detection <br /> Number Description Hydrocarbons Benzene Toluene Benzene Xylenes Limit <br /> pg/L pg/L pg/L pg/L Mg/L Multiplication <br /> (ppb) (ppb) (Ppb) (ppb) (ppb) Factor <br /> 207-0441 Tank 180 22 43 N D 14 DL x 1 <br /> • <br /> Detection Limits* 50 050 060 050 0.50 <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 /> Michael R Giles <br /> Laboratory Director <br /> 2070441 BCP <1 i <br />