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680 Chesape ike Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9233 <br /> Sequoia 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 FAX(916)911 0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792 1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrateg i es Client Prol ID Unocal 6981, Stockton Sampled 05/27/98 <br /> 3164 Gold Camp Drive #240 Sample Descript Eff Received 05/29/98 <br /> Rancho Cordova, CA 95670 Matrix AIR <br /> Analysis Method 8015Mod/8020 Analyzed 05/30/98 <br /> Attention Steve Carter Lab Number 9805H68-02 Reported <br /> QC Batch Number GCO53098BTEX02A <br /> Instrument ID GCHP02 <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) with BTEX <br /> Analyte Detection Limit Sample Results <br /> ug/L ug/L <br /> TPPH as Gas 10 64 <br /> Benzene 010 N D <br /> Toluene 0 10 N D <br /> Ethyl Benzene 0 10 N D <br /> Xylenes (Total) 010 018 <br /> Chromatogram Pattern <br /> Unidentified HC >C10 <br /> Surrogates Control Limits% % Recovery <br /> Trifluorotoluene 70 130 88 <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL _ ELAP #1210 <br /> Gregory <br /> Project Manager Page 2 <br />