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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Pacific Environmental Group Client Proj ID 311-174 1A/5447,Stockton Sampled 02/04/98 <br /> 2025 Gateway Place, Suite 440 Sample Descript SW-20 Received 02/05/98 <br /> San Jose, CA 95110 Matrix SOLID Extracted 02/18/98 <br /> Analysis Method 8015Mod/8020 Analyzed 02/18/98 <br /> Attention J Nelligan Lab Number 9802975-04 Reported 02120198 <br /> OC Batch Number GCO21898BTEXEXB <br /> Instrument ID GCHP18 <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 14 <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 /> Trifluorotoluene 70 130 83 <br /> 4-Bromofluorobenzene 60 140 83 <br /> I <br /> r <br /> f <br /> i <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01210 <br /> Granicher <br /> I Project Manager Page 9 <br /> I <br />