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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (510)968 9600 fAX(510)988-9673 <br /> 819 Striker Avenue Surte 8 Sacramento CA 95834 (916)921 9600 fAX(916)921 0100 <br /> 6 Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707}792 1665 fAX(707) 792 0342 <br /> EA Engineering Science &Tech Client Prol ID Exxon,7-0137, 5150137 1300 Sampled 04/15/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descnpt MW4 Received 04/17/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 04/22/98 <br /> Attention Chnsta Marting _ -Lab Number_9804C34-04 = _ = Reported04J27J98 <br />�QCBatch Number GC042298BTEX06A <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 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 % %' Recove Trrfluorotoluene 70 130 90 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> FEQUOIA ANALYTICAL - ELAP #1210 <br /> frd Herling <br /> ect Manager Page 4 <br />