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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 Creet-CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-010 0 <br /> 6 Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> T EA Engineering Science &Tech Client Prol ID Exxon, 7-0137, 5150137 1300 Sampled 04/15/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW5 Received 04/17/98 <br /> F Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/23/98 <br /> Attention Christa Marting _ Lab Number M9804C34-05 Reported 04f27198 <br />�QC Batch Number bG042398BTEXiiA -= - -- - - -- ------- -- --- - -- - - - - y - - ^�-� <br /> Instrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> ITPPH as Gas 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 0 50 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits% %I Recove Trifluorotoluene 70 130 106 <br /> I <br /> I <br /> i <br /> I <br /> Analytes reported as N D were not present above the stated Ilmrt of detection <br /> FQUOIA ANALYTICAL - ELAP 9V1210 <br /> I k� �atlk' <br /> Pard Herling <br /> ect Manager Page 5 <br />