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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364 9233 <br /> q 404 N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Swte 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 034Z <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-0137, 5150137 1300 Sampled 07/15/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript VEW-2 Received 07/22/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 07/29/98 <br /> Attention Chrlsta Marting Lab Number 9807D08-08 Reported 08103/98 <br /> IQC Batch Number GC072998BTEX18A <br /> nstrument ID GCHP18 <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 25 100 <br /> Benzene 0 50 1 2 <br /> Toluene 050 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 0 84 <br /> Chromatogram Pattern <br />' Surrogates Control Limits % % Recover <br /> Trifluorotoluene 70 130 91 <br /> analytes reported as N D were not present above the stated limit of detection <br />�EQUOIA ANALYTICAL - ELAP 01210 <br /> 4Ar��— <br /> rd Herling <br /> f'ect Manager Page s <br /> 9 <br />