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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 - Sacramento CA 95834 <br /> (916) 921-9600 - FAX (916) 921-0100 <br /> St es Client Project ID #30003-8,Arco 79M N El Dorado,Stockton Sampled� Oct 13, 1992 <br /> 3164 Gold Camp Dr. Suite 200 Sample Matrix Water Received Oct 13, 1992 <br /> Rancho Cordova, CA 95670 Analysis Method EPA 5030/8015/8020 Reported Oct 22, 1992 <br /> Attention Matthew Taylor First Sample# 210-0329 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I.D. I D. I D. I.D. I D. <br /> 1 µ9/L 210-0329 210-0330 210-0331 210-0332 210-0333 <br /> MS-2-2 MS-2-3 MS-3-1 MS-3-2 MS-3-3 <br /> urgeable <br /> Hydrocarbons 50 55 N D 3100 3500 4900 <br /> 1 Benzene 050 N D 12 480 880 1200 <br /> Toluene 050 N D N D 120 82 390 <br /> Ethyl Benzene 050 N D N D N D N D N D <br /> Total Xylenes 0 50 N D N D 57 170 290 <br /> Chromatogram Pattern MSP -- Gas Gas Gas <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 10 20 20 20 <br /> Date Analyzed 10/16/92 10/16/92 10/19/92 10/19/92 10/19/92 <br /> Instrument Identification HP-1 HP-1 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a trash gasoline standard <br /> Analytes reported as N 0 were not detected above the stated reporting limit <br />. SEQUOIA ANALYTICAL <br /> Michael R Giles <br /> Laboratory Director <br /> 2100323 RES <2> <br />