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low Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)3649600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (510)988-9600 FAX(510)988-9673 <br /> frlll>7 <br /> 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)792-0342 <br /> ji <br /> ? Gettler Ryan[Geostrategiess- - ---Client Prod ID Unocal 0123/1034 Central Ave Sampled 03/24/98 <br /> 6747 Sierra Court Suite J Sample Descnpt TB-LB 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 98031-106-01 _ Reported 04109/98_ <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 N D <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 /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 103 <br /> f' <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1271 <br />*JeoctManager Page 3 <br />