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* y 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364 9Z33 <br /> ® Sequoia 404 N Wiget lane Walnut Creek CA 94598 (925)988 9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9ZI 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 79Z 1865 FAX(707)79Z-0342 <br /> s <br /> Gettler Ryan/Geostrategies Client Proj ID Tosco 6981,4707 Pacific Ave Sampled 09/30/98 <br /> 3164 Gold Camp Drive #240 Sample Descnpt Intl Received 10/01/98 <br /> Rancho Cordova, CA 95670 Matrix AIR ` <br /> Analysis Method 8015Mod/8020 = Analyzed 10/03/98 <br /> Attention Steve Carav Lab Number 9810112-01 a ` ' Reported 10/06198 <br /> QC Batch Number GC100398BTEX03A <br /> Instrument ID GCHP03 <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 25 220 <br /> Methyl t-Butyl Ether 1 2 18 <br /> Benzene 025 1 4 <br /> Toluene 0 25 75 <br /> Ethyl Benzene 0 25 20 <br /> Xylenes (Total) 0 25 11 <br /> Chromatogram Pattern GAS <br /> Surrogates Control Limits % % Recovery <br /> Trlfluorotoluene 70 130 102 <br /> 0 <br /> Analytes reported as N D were not present above the stated Amit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> *3ranicher <br /> Project Manager Page 1 <br />