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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 96W FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite B Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EA Engineering Science &Tech Client Prof ID Exxon 7-3942, 51539 42 1300 Sampled 08/26/97 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript MW4 Received 08/27/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mad/8020 Analyzed 09/02/97 <br /> Attention Chnsta Marting Lab Number 9708E45-14 Reported 09J04J97 <br /> QC Batch Number GCO90297BTEX06A - <br /> Instrument ID GCHP06 <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 100 440 <br /> Methyl t-Butyl Ether 50 12 <br /> Benzene 1 0 76 <br /> Toluene 10 N D <br /> Ethyl Benzene 1 0 <br /> Xylenes (Total) N D <br /> Chromatogram Pattern 1 0 N D <br /> Weathered Gas C6-C12 <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 109 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> kQUOIA ANALYTICAL - ELAP 41210 <br /> Rr* Herling <br />�r t Manager Page 12 <br /> I <br />