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Sequoia 819 Sinker Ave Ste 8 <br /> Sacramento CA 95834 <br /> D Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> www sequoialabs com <br /> ettl S Ryan-Dublin Project Former Unocal 5098,Stockton,CA <br /> 6747 Sierra Cotut,Ste J 5308091 <br /> Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L, Hardin <br /> g 08/20/03 16 56 <br /> ' GasolinelBTMOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> fnalyce Result Llmlt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080206-EPA 5030B [P/Tl <br /> aboratory Control Sam le(3080206-BSI) Prepared&Analyzed 08/14/03 <br /> nzene 135 0 50 ug/1 160 84 70-130 <br /> Toluene 764 0 50 742 <br /> 103 70-130 <br /> ethyl tert-butyl ether 273 2 0 24 8 <br /> 110 60-140 <br /> rrogate 1 2-DCA-d4 309 250 <br /> 124 60-140 <br /> Surrogate Toluene-d8 201 250 <br /> 80 GO-140 <br /> rrogate 4-BFB <br /> 232 250 1 <br /> 93 b0-140 <br /> boratory Control Sample(3080206-$S2) Prepared&Analyzed 08/15/03 <br /> Benzene 130 050 ug/1 16 0 1 <br /> B1 70-130 <br /> Uthyl <br /> tic 72 2 0 50 74 2 <br /> 47 70-130 <br /> tert-buryl ether 232 2 0 248 <br /> 94 60-140 <br /> Surrogate 1 2-DCA-d4 206 250 <br /> 82 60-140 <br /> ate Toluene-d8 188 250 75 60-140 <br /> ate 4-BFB 223 250 89 60-140 <br /> Laboratory Control Sample(3080206-BS3) Prepared&Analyzed 08/18/03 <br /> fthy,I <br /> zene 17 5 050 ug/1 20 0 88 70-130 <br /> ue _ l6 1 050 200 80 70-130 tert-bury)ether 21 9 2 0 20 0 110 60-140 <br /> IrSurrogate 1,2-DCA44 205 250 82 60-140 <br /> rogate Toluene-d8 193 250 77 60-140 <br /> rogare 4-BFB 230 250 92 60-140 <br /> ILaboratory Control Sample(3080206-BS4) Prepared 08/I8/03 Analyzed 08/19/03 <br /> nzene 12 3 050 ug/l 160 77 70-130 <br /> luene 680 050 742 92 70-130 <br /> Methyl tent-bury]ether 26 1 20 24 8 105 60-140 <br /> rugate 11-DCA-d4 231 250 92 60-140 <br /> rogate Toluene-d8 186 250 74 60-140 <br /> Surrogate 4-BFB 21 7 250 87 60-140 <br /> uta Analytical - Sacramento The results in this report apply to the samples analyzed in 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 entirely <br /> Page 99 of 117 <br />