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`r <br /> wl ' <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 4 ) 404 N Wiget Lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> T Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 707 792-1865 FAX(707)79Z-034Z <br /> 3 Gettler RyanZGeostrategies- Client Proj ID Unocal 0123/1034 Central Ave Sampled 03/24798 <br /> 6747 Sierra Court Suite J Sample Descript U-2 Received 03/25/98 <br /> Dublin, CA 94568 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/02/98 - <br />' Attention Deanna Harding _ _ Lab Number_98031-106-03 Reported 04JO9198 <br /> QC Batch Number_GC040298802005A <br /> Instrument ID GCHP05 <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 N D <br /> Methyl t-Butyl Ether 25 17 <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 0 50 N D <br /> Xylenes (Total) 050 N D <br /> Chromatograrn Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 81 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01271 <br /> regory <br /> Project Manager Page 1 <br />