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Sequoia 680 Chesapeake Drive Redwood City CA 94,063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 _ (916 %Zt-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petalu —C 94954 - (707)792-1865 FAX(707)792-0342 <br /> ttler-Ryan - Dublin Client Project ID Unocal $S#5417, Manteca Sampled Feb 22, 1999 <br /> 47 Sierra Court, Suite J Sample Matrix Water Received Feb 22, 1999 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mad /8020 Reported Mar 10, 1999 <br /> Attention Deanna Harding First Sample # 902-2174 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample Sample Sample <br /> Analyte Limit I D I D I D I D <br /> Mg/L 902-2174 902-2175 902-2176 902-2177 <br /> TB-LB MW-1 MW-2 MW-3 <br /> Purgeable <br /> Hydrocarbons 50 N D N D 500 N D <br /> Benzene 0 50 N D N D N D N D <br /> Toluene 050 N D N D N D N D <br /> Ethyl Benzene 050 N D N D N D N D <br /> Total Xylenes 050 N D N D N D N D <br /> MTBE 25 ND ND ND ND <br /> Chromatogram Pattern - Gasoline& - <br /> Unidentified <br /> Hydrocarbons <br /> Cb-C12 <br /> Quality Control Data <br /> Report Limit Multiplication Factor 1 0 1 0 4 0 1 0 <br /> Date Analyzed 3/4/99 3/4/99 3/4/99 3/4/99 <br /> Instrument Identification HP-4 HP-4 HP-4 HP-4 <br /> Surrogate Recovery, % 94 97 92 101 <br /> (QC Limits = 70-130°/x) <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 /> SE UOIA ANALYTICAL, #1271 <br />• <br /> AAanne Fegley <br /> Project Manager <br /> 9022174 GET <i> <br />