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SEQUOIA ANALYTICAL <br /> ' 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> �aprealian Engineering, Inc Client Project ID Unocal, 601 E Kettleman Lane, Lodi Sampled Mar 26, 1993 <br /> 2401 Stanwell Dr, Ste 400 Sample Matrix Water Received Mar 26, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Mar 30, 1993 <br /> Attention Mardo Kaprealian, P E First Sample # 303-1218 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample <br /> Analyte Limit I.D. I D I D I D <br /> lig/L 303-1218 303-1219 303-1220 Matrix <br /> MW 7 MW 8 MW 9 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D <br /> Benzene 05 N D N D N D <br /> Toluene 05 N D N D N D <br /> Ethyl Benzene 0 5 N D N D N D <br /> • Total Xylenes 05 N D N D N D <br /> Chromatogram Pattern <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 10 10 1 0 <br /> Date Analyzed 3/29/93 3/29/93 3/29/93 3/29/93 <br /> Instrument Identification HP-4 HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 99 120 124 122 <br /> (OC Limits = 70-130%) <br /> Purgeable Hydrocarbons are quantitated against a fresh gasoline standard <br /> Analytes reported as N Q were not detected above the stated reporting limit <br /> &EGOIAANAL CAL <br /> colt A Chie o <br /> Project Manager 3031212 KEI <2> <br />