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SEQUOIAANALYTICAL BatesAvenue • Suite LM Concord, Californiaoa 94520 <br /> (510) 686-9600 + FAX (510) 686-9689 <br /> aprealian Engineering, Inc Client Project 1D Unocaf#6981,4707 Pacific Ave, Stockton Sampled Oct 20, 1993 <br /> 401 Stanwell Dr, Ste 400 Sample Matrix Water Received Oct 22, 1993 <br /> Concord, CA 94520 Analysis Method EPA 5030/8015/8020 Reported Nov 5, 1993 <br /> Attention Avo Avedessian First Sample # 310-1239 <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 I D I D <br /> pg/L 310-1239 310-1240 310-1241 310-1242 310-1243 310-1244 <br /> MW-1 MW-2 MW-3* MW-4* MW-5 MW-6 <br /> Purgeable <br /> Hydrocarbons 50 440 12,000 1,400 3,600 21,000 220 <br /> Benzene 05 050 2,400 44 490 15,000 10 <br /> Toluene 0 5 099 52 N D N D 120 095 <br /> Ethyl Benzene 0 5 N D N D N D N D N D 1 1 <br /> Total Xylenes 0 5 21 60 N D N D 68 1 1 <br /> Chromatogram Pattern Gasoline Gasoline Non-Gasoline Non-Gasoline Gasoline Gasoline <br /> Mixture Mixture <br /> (<C7) (<C7) <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 40 20 40 100 1 0 <br /> Date Analyzed 10/27/93 10/27/93 10/29/93 10/29/93 10/29/93 10/27/93 <br /> Instrument Identification HP-5 HP-5 HP-4 HP-4 HP-4 HP-5 <br /> Surrogate Recovery, % 103 95 101 98 94 94 <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 Please Note <br /> r <br /> *Non-Gasoline Mixture <C7 refers to unidentified peaks in the EPA 8010 range <br /> Alan emp �' <br /> Project Manager' <br /> 3101239 KEI <1> <br />