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' + Sequoia 680 Chesapeake Drive Redwood City CA 9406_ (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988%-/3 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92t-9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Prol ID Unocal SS#0187, 280045 85 Sampled 03/09/98 µ <br /> 6747 Sierra Court Suite J Sample Descript U-1 Received 03/09/98 <br /> Dublin, CA 94568 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 03/11/98 <br /> Attention Deanna Harding Lab Number 9803523-02 Reported 03/18/98 " <br /> QC Batch Number GC031198BTEX21A <br /> Instrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L. ug/L <br /> TPPH as Gas 50 520 <br /> Methyl t-Butyl Ether 25 15 <br /> Benzene 050 78 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 068 <br /> Xylenes (Total) 050 087 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 123 <br /> 0 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ONALYTICAL - ELAP 01210 <br /> gory <br /> Project Manager Page 6 <br />