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LL i <br /> s Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord, CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> PDS Services Client Project ID Unocal#6981,4707 Pacific Ave,Stockton Sampled Apr 25-26, 1994 <br /> 2401 Stanwell Dr, Ste 400 Sample Matrix Water Received Apr 27, 1994 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported May 11, 1994 <br /> Attention Avo Avedessian First Sample# 404-1376 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit ID ID ID ID ID ID <br /> pg/L 404-1376 404-1377 404-1378 404-1379 404-1380 404-1381 <br /> MW 1 MW 2 MW 3 MW 4 MW 5 MW 6 <br /> Purgeable <br /> Hydrocarbons 50 180 21,000 650 2,200 16,000 500 <br /> Benzene 0 5 21 8,000 13 200 12,000 44 <br /> Toluene 0 5 1 7 240 20 50 92 1 6 <br /> Ethyl Benzene 05 N D 93 N D N D 31 20 <br /> Total Xylenes 0 5 1 5 220 1 7 72 70 1 2 <br /> Chromatogram Pattern Gasoline Gasoline Gasoline Gasoline Gasoline Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 100 1 0 20 50 1 0 <br /> Date Analyzed 5/4/94 5/5/94 5/4/94 5/5/94 5/5/94 5/4/94 <br /> Instrument Identification HP-4 HP-2 HP-4 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 113 104 91 99 108 120 <br /> (QC Limits = 70-130%) <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, #1271 <br /> e <br /> roject Manager <br /> 4041376 MPD <1> <br />