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Sequoia 819 Sinker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> .Analytical (916)921-9600 <br /> FAX(916)921-0[00 <br /> www sequoialabs com <br /> ettler-Ryan-Dublin Project Unocal 5098,Stockton,CA 5210010 <br /> Sierra Court, Ste 3 Project Number NIA Reported <br /> n CA,94568 Project Manager Deanna L Harding 10/14/02 18 46 <br /> Gasoline\BTEXIOxygenates 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 Lima Notes <br /> fateb 2100173 -EPA 5030B IP/T] <br /> nk(2100173-BLK1) Prepared&Analyzed 10/09/02 <br /> lboratory Control Sample(2100173-BSI) Prepared&Analyzed 10/09/02 <br /> thy]tent-butyl ether 324 050 ug/1 250 130 60-140 <br /> Benzet4e 274 050 250 110 70-130 <br /> 1uene 265 050 25 0 106 70-130 <br /> Surrogate Toluene-d8 -773 " 250 109 60-140 ' <br /> 1gate 4-BFB 263 ry' 250 105 60-140 <br /> ,019we 12-DCA-d4 295 250 118 60-140 <br /> trix Spike(2100173-MSI) Source 5209540-01 Prepared&Analyzed 10/09/02 <br /> hyl cert-butyl ether 332 050 ug/I 250 ND 133 60-140 <br /> Benzene 297 050 25 0 ND 115 70-130 <br /> 1* 26 7 050 25 0 ND 107 70-130 <br /> Surrogate Toluene-d8 273 2.50 109 60 140 <br /> ogate 4-BFB 264 250 106 60-140 <br /> ogate 12-DCA-d4 307 250 123 60 140 <br /> trix Spike Dup(2100173-MSDI) Source 5209540-01 Prepared&Analyzed 10/09/02 <br /> Shy]tent-butyl ether 322 050 ug/l 25 0 ND 129 60-140 3 25 <br /> 3enzene 278 0 50 250 ND IH 1 70-130 3 25 <br /> ene 25 6 050 25 0 ND 102 70-130 4 25 <br /> urrogate Toluene-d8 269 250 108 60-140 <br /> ogate 4-BFB 26 7 15 0 107 60-140 <br /> ogate 12 DCA-d4 310 1S 0 114 60-140 <br /> uoia Analytical - Sacramento The results in this i eport apply to the samples analyzed to accordance with the chain of <br /> • custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 100 of 119 <br />