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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 TAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Iwo- 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 /> • <br /> Gettler Ryan[Geostrategies Client Proj ID Unocal 5421, Stockton Sampled 04/15/98 <br /> 6747 Sierra Court Suite J Sample Descript UT-2-4 Received 04/16/98 <br /> Dublin, CA 94568 Matrix SOLID Extracted 04/16/98 <br /> Analysis Method 8015Mod/8020 Analyzed 04/16/98 <br /> Attention Clyde Galantine Lab Number 9804Al2-03 Reported 04/17198 <br /> QC Batch Number GC041698BTEXEXA <br /> Instrument ID GCHP07 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> TPPH as Gas 10 N D <br /> Methyl t-Butyl Ether 0 025 0 089 <br /> Benzene 00050 N D <br /> Toluene 00050 0 010 <br /> Ethyl Benzene 00050 N D <br /> Xylenes (Total) <br /> Pattern 0 0050 N D <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 98 <br /> 4-Bromofluorobenzene 60 140 96 <br /> i <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> regory <br /> Project Manager Page 5 <br />