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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> Sequoia 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 /> EA Engineering Science&Tech Client Prol ID Exxon 7-3942/5153942 1300 Sampled <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt Trip Blank Received 02/04/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 02/05/97 <br /> Attention Chnsta Marting Lab Number 9702110-01 Reported 02J12197 <br /> 1C Batch Number GCO20497BTEX03B <br /> 1strument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 50 N D <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 />'Surrogates Control Limits% % Recovery <br /> Trlfluorotoluene 70 130 106 <br /> 1 <br /> I <br /> Analytes reported as N D were not present above the stated limit of detection <br />[EQUOIA ANALYTICAL - ELAP #1210 <br /> I \ <br /> r <br /> PI ett <br /> roject Manager Page t <br /> I <br />