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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> r 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 /> Enviros Client Prol lb Shell 1267 Country Club, Stck Sampled 04/04/97 <br /> 270 Perkins Ave Sample Descript SB-4-31 Received 04/08/97 <br /> Sonoma, CA 95476 Matrix SOLID Extracted 04/11/97 <br /> Analysis Method 8015Mod/8020 Analyzed 04/12/97 <br /> Attention Joe Neely Lab Number 9704512-14 Reported 04I22I97 <br /> QC Batch Number GC041197BTEXEXA <br /> Instrument ID GCHP18 <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 1 5 <br /> Methyl t-Butyl Ether 0 025 0 026 <br /> Benzene <br /> 00050 N D <br /> 00050 N D <br /> Toluene <br /> Ethyl Benzene 00050 0015 <br /> Xylenes (Total) 00050 <br /> Chromatogram Pattern C6-C12 <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 93 <br /> 4-Bromofluorobenzene 60 140 92 <br /> 9 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> Project Manager Page 35 <br />