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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Dine Walnut Creek CA 94598 (510)988 9600 FAX(510)968-9673 <br /> 619 5tr+ker Avenue Suice 8 Sacramento CA 95834 (916)9Z1 9600 FAX(916)921 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.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 /> 3468 Mt Diablo Blvd Ste B1 DO Sample Descnpt TB 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 9804C34-09 Reported 04f27198 <br />�QC Batch 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 % % Recover <br /> Trifluorotoluene 70 130 101 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 41210 <br /> P <br /> and Herting <br /> ect Manager Page 9 <br />