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F. <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Greek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> IQF Analytical 819 Sacker Avenue Smote s Sacramento CA 95834 (916)911-9600 FAX(916)911-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 0ttler-Ryan - Dublin Client Project ID Unocal SS#5886, Stockton Sampled Mar 1, 1999 <br /> 47 Sierra Court, Suite J Sample Matrix Water Received Mar 2, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Mar 24, 1999 <br /> Attention Deanna Harding First Sample # 903-0239 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <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 903-0239 903-0240 903-0241 903-0242 903-0243 903-0244 <br /> MW-51D MW-5S MW-60 MW-6S MW-71D MW-7S <br /> Purgeable <br /> Hydrocarbons 50 N D N D N D N D N D N D <br /> Benzene 050 N D N D N D N D N D N D <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 Xvlenes 050 N D N D N D N D N D N D <br /> MTBE 25 ND 39 15 55 ND ND <br /> Chromatogram Pattern - - _ _ <br /> Quality Control Data <br /> Report Limit Multiplication Factor 10 1 0 1 0 1 0 10 10 <br /> Date Analyzed 3/10/99 3/10/99 3/10/99 3/9/99 3/9/99 3/9/99 <br /> Instrument Identification HP-2 HP-2 HP-2 HP-5 HP-9 HP-9 <br /> Surrogate Recovery, % 106 106 110 91 94 95 <br /> (QC 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, #1271 <br /> GL"ati <br /> u anne Fegley <br /> roject Manager <br /> 9030233 GET <2> <br />