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4 a- ) Sequoia Walnut Creek,CA 945% <br /> Analytical (925)988-9600 <br /> FAX(925)988-9673 <br /> leGettler-11yan -Dublin Client Project ID 'Unocal #5886, Stockton Sampled Aug 16-17, 1999' <br /> ,6747 Sierra Court, Suite J Sample Matrix Water Received Aug 18, 1999- <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Sep 14, 1999, <br /> Attention Deanna Harding First Sample# W908373 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX/ MTBE <br /> Reporting Sample Sample Sample <br /> Analyte Limit I.D I D. l.D <br /> pg/L W908373-19 908373-20 908373-21 <br /> MW-10S MW-101 MW-10D <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D <br /> Benzene 050 N D N D N D <br /> Toluene 050 N D N D N D <br /> Ethyl Benzene 050 N D N D N D <br /> • Total Xylenes 050 N D N D N D <br /> MTBE 25 56 57 10 <br /> Chromatogram Pattern - <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 10 1 0 <br /> Date Analyzed 8/27/99 8/27/99 8/27/99 <br /> Instrument Identification HP-5 HP-5 HP-5 <br /> Surrogate Recovery, % 88 88 90 <br /> (OC Limits = 70-130°/x) <br /> Purgeable Hydrocarbons are quantdated against afresh gasoline standard <br /> Analytes reported as N D were not detected above the stated reporting lima <br /> SEQUOIA ANALYTICAL, #1271 <br /> ulianne Fegley <br /> Project Manager <br /> W908373 GET <4> <br /> u�ry <br />