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14 SEQUOIA ANALYTICAL � LS � "I �y t� U0 <br /> -Z 1900 Bates Avenue - Suite LM - Concord, California 94520 DEC 21 1992 <br /> (510) 686-9600 - FAX (510) 686-9689 ERM-WEST <br /> 4O �'�AtJTCfi.�. FILE # � to <br /> RM-West Client Project ID #1572 01, Stockton Sampled ~'D�e�=B, 11992 <br /> 1777 Botelho Or, Suite 260 Sample Matrix Water Received Dec 8, 1992 <br /> Walnut Creek, CA 94596 Analysis Method EPA 5030/8015/8020 Reported Dec 18, 1992 <br /> Attention Bruce Pfaff First Sample# 212-0408 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I.D. I.D. I D. I.D. I D. <br /> pg/L 212-0408 212-0409 212-0410 212-0411 212-0412 212-0413 <br /> MW1 MW2 MW3 MW4 MW5 MW1A <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D 1,800 29,000 <br /> Benzene 05 N D N D N D N D 480 7,800 <br /> Toluene 0 5 N D N D N D N D 33 2,500 <br /> Ethyl Benzene 05 N D N D N D N D 110 1,000 <br /> Total Xylenes 0 5 N D N D N D N D 140 4,200 <br /> Chromatogram Pattern Gasoline Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 10 1 0 10 10 200 <br /> Date Analyzed 12/11/92 12/11/92 12/11/92 12/11/92 12/11/92 12/16/92 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-2 HP-2 HP-4 <br /> Surrogate Recovery, % <br /> (QC Limits = 70-130%) 99 99 99 104 103 102 <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting limit <br /> SEQUOIA ANALYTICAL <br /> Kenneth K F Lee <br /> Laboratory Director 2120408 ERM <1> <br />