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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical <br /> . 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Prol ID Unocal 5421, Stockton Sampled 04/15/98 <br /> 6747 Sierra Court Suite J Sample Descrlpt ,MI-1-11 Received 04/16/98 <br /> Dublin, CA 94568 Matrix SOLID t-t X r!r Extracted 04/16/98 <br /> Analysis Method 8015Mod/8020 Analyzed 04/16/98 <br /> Attention Clyde GalantineLab Number 9804Al2-01 Repotted 04117198 <br /> 1 11.1CSC Batch Number GC041698BTEXEXA <br /> Instrument ID GCHP07 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit <br /> Sample Results <br /> mg/Kg mg/Kg <br /> TPPH as Gas 1 0 N D <br /> Methyl t-Butyl Ether 0 025 N D <br /> Benzene 00050 N D <br /> Toluene 00050 N D <br /> Ethyl Benzene 00050 N D <br /> Xylenes (Total) 00050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% % Recovery <br /> Trlfluorotoluene 70 130 85 <br /> 4-Bromofluorobenzene 60 140 94 <br /> • <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> e egory <br /> Project Manager Page 2 <br />