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' 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> Sequoia <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0i00 <br />' Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792 1865 FAX(707}792 0342 <br /> EA Engineering Science & Tech Client Pro) ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW2 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/27/98 <br /> Attention Chnsta Marting Lab Number 9808C95-01 Reported 09f04/98 <br /> QC Batch Number GC082798BTEX30A <br /> Instrument ID GCHP30 <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 50 110 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 2 1 <br /> Ethyl Benzene 050 1 2 <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 105 <br /> Analytes reported as N D were not present above the stated hmrt of detection <br />[EQUOIA ANALYTICAL - ELAP 9111210 <br />�40d Herling <br /> t Manager Page 2 <br />