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• <br /> 4DSequoia 404 N Wlget Lane <br /> 1 Walnut Creek,CA 94598 <br /> I,IV Analytical {925)988-9600 <br /> FAX(925)988-9673 <br /> 4kettler-Pyan- 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 /> OC Batch Number <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX/ MTBE <br /> Reporting Sample Sample Sample Sample Sample Sample <br /> Analyte Ltmd LD I.D. I D. I D I D. 11.11) <br /> pg/L W908373-07 908373--08 908373-09 908373-10 908373-11 908373-12 <br /> MW-50 MW-5S MW-6D MW-6S MW-7D MW-7S <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D N D N D <br /> I <br /> Benzene 050 ND ND ND ND ND ND <br /> Toluene 050 N D N D N D N D N D N D <br /> Ethyl Benzene 050 N D N D N D N D N D N D <br /> Total Xyienes 050 N D N D N D N D N D N D <br /> MTBE 25 ND 69 93 30 ND ND <br /> Chromatogram Pattern -- -- - _ -- <br /> Quality <br /> -Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 10 10 1 0 10 <br /> Date Analyzed 8/27/99 8/27/99 8/27/99 8/27/99 8/27/99 8/27/99 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-2 HP-2 HP-5 <br /> Surrogate Recovery, % 91 98 93 95 98 88 <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 /> #�1271 <br /> • l�Lvrt., v w4 L <br /> J anne Fegley <br /> Project Manager <br /> W908373 G ET <2> <br />