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- , 680 Chesapeake Drive Redwood Cry CA 94063 (650) 364-9600 FAX{650) 364 9233 <br /> Sequoia <br /> + 404 N Wiget Lane Walnut Creek CA 94598 (510)958 9600 FAX(5!0)988 9673 <br /> 819 Sacker Avenue Suire 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 OIOo <br /> 6 Analytical 1455 McDowell Blvd North Ste D Peralurna,CA 94954 (707)792-1865 FAX(707)792 0342 <br /> EA Engineering Science &Tech _ -Client Prol ID Exxon, 7-0137, 5150137 1300 Sampled 04%15/98 <br /> 3488 Mt Diablo Blvd Ste B100 Sample Descript MW1 Received 04/17/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/23/98 <br /> - Attention Chnsta Marting _Lab Number 9804C34-01 Reported 04/27/98 <br /> OC Batch Number GC042398BTEX21A <br /> Instrument 1D GCHP21 <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 0 50 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recove <br /> Trifluorotoluene 70 130 108 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br />!SEQUOIA ANALYTICAL - ELAP #1210 <br /> 11�-'� 2 � <br /> Pard Herling <br /> ect Manager Page i <br /> 9 <br /> 1 <br />