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680 Chesapeake Drive Redwood City CA 94063 (65o) 364 9600 FAX{650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (5 101 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX (916) 921 0100 <br /> EA Engineering Science &Tech Client Proj ID Exxon 7-0137, 51501 37 1300 Sampled 10/10/97 <br /> 468 Mt Diablo Blvd Ste B100 Sample Descnpt MW6 Received 10/13/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 10/22/97 <br /> Attention Chnsta Marting Lab Number 9710816-06 Reported 10/24/97 <br /> IC Batch Number GC102297BTEX03A <br /> strument ID GCHP03 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX and MTBE <br />'Analyte Detection Limit Sample Results <br /> ug/L ug/L <br />� <br /> PPH as Gas 50 N D <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 0 50 N D <br /> Vthenes <br /> ylBenzene 050 N D <br /> (Total) 050 N D <br /> Chromatogram Pattern <br /> Varrogates Control Limits % % Recovery <br /> nfluorotoluene 70 130 102 <br /> analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIAANALYTICAL - ELAP 01210 <br /> rd Herling <br /> ect Manager Page 7 <br />