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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> 4D 819 Striker 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)792-0342 <br /> Gettler Rya n/G eost rateg ies Client Prol ID Unocal 5421, Stockton Sampled 04/16/98 <br /> 6747 Sierra Court Suite J Sample Descript US-8 Comp Received 04/17/98 <br /> Dublin, CA 94568 Matrix SOLID Extracted 04/24/98 <br /> Analysis Method 8015Mod/8020 Analyzed 04/24/98 <br /> Attention Clyde Galantine Lab Number 9804B92-08 Reported 05/01198 <br /> QC Batch Number SP0424988020EXA <br /> Instrument ID GCHPO4 <br /> Total Purgeable Hydrocarbons (TPPH) with BTEX and MTBE <br /> Analyte Detection Limit Sample Results <br /> mg/Kg mg/Kg <br /> TPPH as Gas 100 290 <br /> Methyl t-Butyl Ether 25 N D <br /> Benzene 050 N D <br /> Toluene 050 2 6 <br /> Ethyl Benzene 050 4 0 <br /> Xylenes (Total) 050 24 <br /> Chromatogram Pattern Gas <br /> Surrogates Control Limits % % Recovery <br /> Trifluorotoluene 70 130 467 Q <br /> 4-Bromofluorobenzene 60 140 Q <br /> Analytes reported as N D were not present above the stated limit of detection <br /> SEQUOIA ANALYTICAL - ELAP 01271 <br /> gory <br /> rOiect Manager Page 9 <br />