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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 9 FAX (510) 686-9689 <br /> 0prealian Engineering, Inc Client Project 1D Unocal#6015 601 E Kettleman Ln , Lodi Sampled Sep 28, 1993 <br /> 01 Stanwell Dr, Ste 400 Sample Matrix Water Received Sep 28, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Oct 12, 1993 <br /> Attention Avo Avedessian First Sample # 309-1451 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Limit I D I I D I D I D I D <br /> erg/L 309-1451 309-1452 309-1453 309-1454 309-1455 309-1456 <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 N D N D <br /> Benzene 05 077 N D N D N D N D N D <br /> Toluene 05 ND ND ND ND ND ND <br /> Ethyl Benzene 05 N D N D N D N D N D N D <br /> Total Xylenes 05 N D N D N D N D N D N D <br /> Chromatogram Pattern _ _ <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 10/7/93 10/7/93 10/7/93 10/7/93 10/7/93 10/7/93 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-2 HP-2 HP-2 <br /> Surrogate Recovery, % 104 88 104 102 100 102 <br /> (OC 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 <br /> tAlaKnB - e4<i <br /> Project Manager/ <br /> 3091451 KEI <1> <br />