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680 Chesapeake Drive Redwood City CA 94063 {650} 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite$ Sacramento CA 95834 {916}921 9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Gettler Ryan/Geostrategles Client Pro) ID Unocal 5421, Stockton Sampled 04/16/98 <br /> 6747 Sierra Court Suite J Sample Descript US-6 Comp Received 04/17/98 <br /> Dublin, CA 94568 Matrix SOLID Extracted 04/24/98 <br /> Analysis Method 8015Mod/8020 Analyzed 04/24/98 <br /> Attention Clyde Galantine Lab Number 9804692-06 Reported 05/01198 <br /> QC Batch Number SP0424988020EXA <br /> Instrument ID GCHPO4 <br /> Total Purgeable Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> TPPH as Gas 20 360 <br /> Methyl t-Butyl Ether 050 N D <br /> Benzene 010 0 21 <br /> Toluene 010 6 2 <br /> Ethyl Benzene 010 7 9 <br /> Xylenes (Total) 010 49 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 153 Q <br /> 4-Bromofluorobenzene 60 140 Q <br /> I <br /> Analytes reported as N D were not present above the stated lirmt of detection <br /> SEQUOIA ANALYTICAL - ELAP #1271 <br /> egory <br /> Project Manager Page 7 <br />