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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9Z33 <br /> 404 N Wig&Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)9z1-9600 FAX(916)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792 0342 <br /> Gettler Ryan/Geostrategies Client Prof ID Unocal 6981, 14012402 Sampled 04/20/98 <br /> , 3164 Gold Camp Drive #240 Sample Descript Eff Received 04/22/98 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mad/8020 Analyzed 04/23/98 <br /> Attention Steve Carter Lab Number 9804D87-01 Reported 04/29198 <br /> QC Batch Number GC042398BTEX21A <br /> Instrument ID GCHP21 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 10 44 <br /> Benzene 0 10 N D <br /> Toluene 010 N D <br /> Ethyl Benzene 0 10 N D <br /> Xylenes (Total) 0 10 067 <br /> Chromatogram Pattern <br /> Weathered Gas C6-C10 <br /> surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 109 <br />� s <br /> Analytes reported as N D were not present above the stated Amit of detection <br /> SEQUOIA ANALYTICAL - ELAP #1210 <br /> regory <br /> Project Manager Page S <br />