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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(654)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Wettler-Hyan Client Project ID UNOCAL#5421 - Stockton 1 o Sampled Apr 21, 1998 <br /> 6747 Sierra Court, Suite J Sample Matrix Sod Received Apr 21, 1998 <br /> Dublin, CA 94568 Analysis Method EPA 5030/8015 Mod /8020 Reported Apr 22, 1998 <br /> Attention Clyde Galantine First Sample # 804-1413 <br /> QC Batch Number SP042198 SP042198 <br /> TOTAL PURGEABLE PETROLEUM HYDROCARBONS with BTEX / MTBE <br /> Reporting Sample Sample <br /> Analyte Limit I D I D <br /> mg/Kg 804-1413 804-1414 <br /> UX-7-26 UX-8-26 <br /> Purgeable <br /> Hydrocarbons 10 10 24 <br /> Benzene 00050 0 068 077 <br /> Toluene 00050 028 33 <br /> Ethyl Benzene 00050 0 2 0 5 <br /> Total Xylenes 00050 1 1 2 9 <br /> MTBE 0 050 N D N D <br /> Chromatogram Pattern Gasoline Gasoline <br /> Quality Control Data <br /> Report Limit Multiplication Factor 20 10 <br /> Date Analyzed 4/21/98 4/21/98 <br /> Instrument Identification HP-4 HP-4 <br /> Surrogate Recovery, % 89 130 <br /> (QC Limits = 40-140%) <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 /> QUOTA ANALYTICAL, #1271 <br /> L <br /> AlaImp <br /> Laborat ry ector <br /> 8041413 GET ¢1> <br />