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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9Z33 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792 1865 FAX(707)792 0342 <br /> EA Engineering Science &Tech Client Prof ID Exxon, 7-0137, 5150137 1300 Sampled 04/15/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW7 Received 04/17/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/23/98 <br /> Attention Christa Marting Lab Number 9804C34-07 Reported 04127f98 <br /> nC Batch Number GC042398BTEX21A <br /> Enstrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTE7X and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br />` TPPH as Gas 50 68 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 N D <br />' Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Unidentifted HC C6-C8 <br />' Surrogates Control Limits % % Recove <br /> Trifluorotoluene 70 130 103 <br /> 1 <br /> Analytes reported as N D were not present above the stated Ilmit of detection <br /> FEQUOIA ANALYTICAL - ELAP 41210 <br /> p Y�� <br /> P'rd Herltng <br /> ct Manager Page 7 <br />