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1� 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia <br /> ® 404 N Wiget Lane Walnut Creek CA 94598 (510)988 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 rAX(916)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)79Z-1865 FAX(707)792 0342 <br /> • <br /> Gettler Ryan/Geostrategies Client Prot ID Unocal 6981, 140124 02 Sampled 04/20/98 <br /> 3164 Gold Camp Drive #240 Sample Descript Inf Received 04/22/98 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 04/23/98 <br /> Attention Steve Carter Lab Number 9804D87-02 Reported 04J29f 98 <br /> QC Batch Number GC0423988TEX21A <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 so 850 <br /> Benzene 050 N D <br /> Toluene 050 N D <br /> Ethyl Benzene 0 50 35 <br /> Xylenes (Total) 050 67 <br /> Chromatogram Pattern <br /> Weathered Gas C6-C10 <br /> Surrogates Control Limits % % Recovery <br /> Tnfluorotoluene 70 130 106 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01210 <br /> regory <br /> Project Manager Page 2 <br />