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819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> 'mow (916)921-9600 <br /> Analytical <br /> FAX(91 b)921-0100 <br /> r-Ryan-Dublin Project Former Unocal 0187,Stockton,CA S211332 <br /> 6747 Sierra Court,Ste j Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 12/27/02 17 49 <br /> GasolineWEXloxygenates by EPA method 8260B -Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> lAnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2110282-EPA 5030B IPITI <br /> Matrix Spike Du (2110282-MSD1) Source S211249-01 Pre ared&Analyzed 11/19/02 <br /> Surrogate 1,2-DCA-d4 238 ug/1 250 95 60-140 <br /> Surrogate Toluene-d8 21 9 250 88 60-140 <br /> Surrogate 4-BFB 11 8 250 87 60-140 <br /> Batch 2110312-EPA 50308 IP/TI <br /> Blank(2110312-BLKI) Prepared&Analyzed 11/20/02 _ <br /> Benzene ND 0 50 119/1 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 1 0 " <br /> Met ] ten-butyl ether ND 0 50 " <br /> t e(C6-C10) ND 50 " <br /> Surrogate 1,2-DCA-d4 274 25 0 110 60-140 <br /> Surrogate Toluene-d8 246 250 98 60-140 <br /> Surrogate 4-BFB 22 7 25 0 91 60-140 <br /> Laboratory Control Sample 2110312-BS1 Prepared &Analyzed 11/20/02 <br /> Benzene 13 0 0 50 ug/l 134 97 70-130 <br /> Toluene 73 8 050 81 0 91 70-130 <br /> Methyl Cert-butyl ether 200 0 50 21 8 92 60-140 <br /> Gasoline(C6-CIO) 875 50 " 1100 80 70-130 <br /> Surrogate 1,1-DCA-d4 28 2 250 113 60-140 <br /> Surrogate Toluene-d8 242 25 0 97 60-140 <br /> Surrogate 4-BFB 235 250 94 60-140 <br /> Matrix Spike(2110312-MSI) Source- S21_1332-09 Prepared 11/20/02 Analyzed 11/21/02 <br /> Benzene 123 0 50 ug/I 13 4 ND 92 70-130 <br /> Toluene 70 5 0 50 " 81 0 052 86 70-130 <br /> Methyl tert-butyl ether 208 0 50 21 8 ND 95 60-140 <br /> Gasoline(C6-CIO) 811 50 1100 ND 74 60-140 <br /> Surrogate 1 2-DCA-d4 286 " 15 0 114 60-140 <br /> Am <br /> ola Analytical-Sacr"amcnto The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated, results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> 35 of 41 <br />