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Sequoia 660 Chesapeakc Drove Redwood City C4 94063 (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wi8et Lane Walnut Creek CA 94598 (5 10) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-0137, 51501 37 1300 Sampled 10/10/97 <br /> 3468 Mt Diablo Blvd Ste 8100 Sample Descript MW5 Received 10/13/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/SD20 Analyzed 10/22/97 <br /> Attention Chnsta Marting Lab Number 9710816-05 Reported 10124J97 <br /> tC Batch Number GC102297BTEX02A <br /> strument ID GCHP02 <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 5o 94 <br /> Methyl t-Butyl Ether 25 45 <br /> Benzene 050 N D <br /> Toluene 0 50 N D <br /> Ethyl Benzene 050 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Unidentified HC C6-C8 <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 104 <br /> analytes reported as N D were not present above the stated limit of detection <br /> 1EQUOIA ANALYTICAL - ELAP 01210 <br /> r <br /> ! i <br /> Af <br /> rd Herling <br /> ct Manager Page 6 <br /> t <br /> r� <br />