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680 Chesapeake Dnvc Redwood Cary CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Crcck CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 8 t 9 Stnkcr Avenue Suttc 8 Sacramento CA 95834 (916) 92t 9600 FAX (916) 921 0100 <br /> EA Engineering Science &Tech Client Prol ID Exxon 7-3942, 51539 42 1300 Sampled 11/11/97 <br /> 3458 Mt Diablo Blvd Ste 8100 Sample Descrtpt MW13 Received 11/12/97 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 11/22/97 <br /> Attention Chnsta Marting Lab Number 9711732-09 Reported 12JO2197 <br /> C Batch Number GC1 12297BTEX21 A <br /> strument ID GCHP21 <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 0 50 N D <br /> tEthyl Benzene 0 50 N D <br /> Xylenes (Total) 050 N D <br /> Chromatogram Pattern <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 83 <br /> 1 <br /> 1 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> LEQUOIA ANALYTICAL - ELAP 01210 <br /> rd Herling <br /> ect Manager Page 12 <br />