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Sequoia 819 Striker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> Ia3 <br /> � Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> www sequoialabs com <br /> %,e"-Ryan-Dublin Project Unocal 5098,Stockton,CA S210010 <br /> Sierra Court,Ste J Project Number NIA Reported <br /> CA, 94568 Project Manager Deanna L Harding 10/14/02 18 46 <br /> Gasolme1BTEMOxygenates by EPA method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> tatch 2100085- EPA 5030B JP/T] <br /> nk(2100085-BLK1) Prepared&Analyzed 10/05/02 <br /> rogate 4-BFB 215 15 0 86 60-140 <br /> rogate 1 2-DCA-d4 239 250 96 60-140 <br /> boratory Control Sample(2100085-BSI) Prepared&Analyzed 10/05/02 <br /> Ethyl tert-butyl ether 297 050 ug/l 250 119 60-140 <br /> Benzene 272 050 250 109 70-130 <br /> Iuene 260 050 25 0 106 70-130 <br /> .rogale Toluene-d8 274 250 110 60-140 <br /> Surrogate 4-BFB 266 250 106 60-140 <br /> rogate 1 2-DCA-d4 289 250 116 60-140 <br /> trix Spike(2100085-MSI) Source 5210010-07 Prepared&Analyzed 10/05/02 <br /> rt-bury]ether 306 050 ug/l 250 086 119 60-140 <br /> e 84 8 030 250 58 107 70-130 <br /> Toluene 31 4 050 25 0 5 0 106 70-130 <br /> aiwrogale Toluene-d8 275 2.50 110 60-140 <br /> Surrogate 4-BFB 277 25 0 111 60-140 <br /> Vate 12-DCA d4 290 2.50 116 60 140 <br /> Matrix Spike Du (2100085-MSD]) Source S210010-07 Prepared&Analyzed 10/05/02 <br /> yl tert-butyl ether 29 6 0 50 ug/1 25 0 086 115 60-140 3 25 <br /> thene <br /> 80 4 050 25 0 58 90 70-I30 5 25 <br /> Toluene 306 050 25 0 5 0 102 70-130 3 25 <br /> ogate Toluene d8 275 250 110 60-140 <br /> Surrogate 4 BFB 265 25 0 106 60-140 <br /> ogate 1 1-DCA44 281 15 0 113 60 140 <br /> uola Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> Custody document Unless otherwrse stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 96 of 119 <br />