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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> 404 N Liget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5101 988 9673 <br /> j0 <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 7-3942, 5153942 1300 Sampled 08/08/96 <br />' 3468 Mt Diablo Blvd Ste B100 Sample Descript RW2 Received 08/09/96 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/16/96 <br /> Attention Tracy Faulkner Lab Number 9608581-10 Reported 08122196 <br />' QC Batch Number GC081696BTEX02A <br /> instrument ID GCHP2 <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 1000 7800 <br /> Methyl t-Butyl Ether 50 N D <br /> Benzene 10 160 <br /> Toluene 10 360 <br />' Ethyl Benzene 10 470 <br /> Xylenes (Total) 10 1100 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 105 <br /> b <br /> r <br /> k <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - EIRP 41210 <br /> Kevin Follett <br /> Project Manager Page 10 <br />