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Sequoia 680 Chesapeake Dnve 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 /> 6 Analytical 819 Strikcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> I - Pacific Environmental Group Client Prof ID 311-174 1A/BP #5447,Stockton Sampled 02/13/98 <br /> 2025 Gateway Place, Suite 440 Sample Descript PP-4 Received 02/17/98 <br /> San Jose, CA 95110 Matrix SOLID Extracted 02/24/98 <br /> Analysis Method 8015Mod/8020 Analyzed 02/24/98 <br /> Attention Joe Muzzio Lab Number 9802686-10 Reported 03J30198 <br /> _QC Batch Number GCO22498BTEXEXB <br /> Instrument ID GCHP07 <br /> ITotal Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> TPPH as Gas 1 0 N D <br /> Methyl t-Butyl Ether 0 025 0 030 <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 /> iSurrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 91 <br /> 4-Bromofluorobenzene 60 140 107 <br /> IAnalytes reported as N I] were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Tod Granicher <br /> Project Manager Page 20 <br />