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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> prealian Engineering, Inc Client Project 11) Unocal, 2835 Navy Dr, Stockton Sampled May 28, 1993 <br /> 401 Stanwell Or, Ste 400 Sample Matrix Water Received May 29, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Jun 8 1993 <br /> Attention Mardo Kaprealian, P E First Sample # 305-1491 <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 10 1 D <br /> pg/L 305-1491 305-1492 305-1493 305-1494 305-1495 305-1496 <br /> MW- 1 MW -2 MW -3 MW -4 MW - 5 MW-6 <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D 7,300 N D <br /> Benzene 0 5 N D N D N D N D 2,100 N D <br /> Toluene 05 ND ND ND ND 47 ND <br /> Ethyl Benzene 05 N D N D N D N D 160 N D <br /> Gkotal Xylenes 05 N D N D N D N D 840 N D <br /> Chromatogram Pattern - - Gasakne <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 20 1 0 <br /> Date Analyzed 6/4/93 6/4/93 6/4/93 6/4/93 6/4/93 6/4/93 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 92 97 93 93 91 96 <br /> (CC 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 /> SED IA ANALYTICAL <br /> i <br /> colt A�Chie o <br /> Project Manager <br /> 3051491 KEI <1 <br />