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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (92 5)988-%00 FAX(925)988 9673 <br /> 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-034Z <br /> EA Engineering Science &Tech Client Proj ID Exxon 7-3942, 5153942 1300 Sampled 08/19/98 <br /> 3468 Mt Diablo Blvd Ste B100 Sample Descript UVB-MW1 Received 08/20/98 <br /> Lafayette, CA 94549 Matrix LIQUID <br /> Analysis Method 8015Mod/8020 Analyzed 08/26/98 <br /> Attention Chrlsta Marting Lab Number 9808C98-21 Reported 09JO4198 <br /> QC Batch Number GC082698BTEX2IA <br /> Instrument 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 25000 100000 <br /> Methyl t-Butyl Ether 1250 N D <br /> Benzene 250 13000 <br /> Toluene 250 22000 <br /> Ethyl Benzene 250 2900 <br /> Xylenes (Total) 250 14000 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits %, % Recover <br /> Trifluorotoluene 70 130 101 <br /> r <br /> knalytes reported as N D were not present above the stated Amit of detection <br />�EQUOIA ANALYTICAL - ELAP 41210 <br /> ti Herling <br />�ro ct Manager Page 6 <br />