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- ` SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> iWaprealian Engineering, Inc Client Project 1D Unocal, 7303 Pacific Ave , Stockton Sampled Jun 21, 1993 <br /> 401 Stanwell Dr, Ste 400 Sample Matrix Water Received Jun 21, 1993 <br /> Concord, CA 94520 Analysts Method EPA 5030/8015/8020 Reported Jul 1, 1993 <br /> Attention Mardo Kaprealian, P E First Sample # 306-0894 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX DISTINCTION <br /> Reporting Sample Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I D I D <br /> Mg/L 306-0894 306-0895 306-0896 306-0897 Matrix <br /> MW- 1 MW - 2 MW-3 MW -4 Blank <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D <br /> Benzene 05 N D N D N D N D <br /> Toluene 05 N D N D N D N D <br /> Ethyl Benzene 05 N D N D N D N D <br />•Total Xylenes 05 N D N D N D N D <br /> Chromatogram Pattern - -- -- -- <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 1 0 1 0 1 0 <br /> Date Analyzed 6/23/93 6/23/93 6/23/93 6/23/93 6/23/93 <br /> Instrument Identification HP-2 HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 102 106 106 103 96 <br /> (QC Limrts = 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 /> Alan`B mp <br /> ct Manager f <br /> 3080894 KEI c 1> <br />