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819 Striker Ave Ste 8 <br /> Sequoia sacram uto.CA95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> www sequolalabs com <br /> Gettler-Ryan-Dublin Project TOSCO 11192,Stockton,CA S305429 <br /> 6747 Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 05/29/03 17 15 <br /> Gasoline\BTEX\Oxygenates 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 /> Batch 3050437-EPA 5030B [P/TJ <br /> Blank(3050437-BLK1) Prepared&Analyzed 05/27/03 <br /> Benzene ND 050 u9A <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate Toluene-d8 296 " 250 118 60-140 <br /> Surrogate 4-BFB 248 250 99 60-140 <br /> Laboratory Control Sample(3050437-BSI) Prepared&Analyzed 05/27/03 <br /> Benzene 131 0 50 ug/I 13 6 96 70-130 <br /> Toluene 76 4 0 50 83 4 92 70-130 <br /> Methyl tert-butyl ether 192 2 0 224 86 60-140 <br /> Gasoline(C6-C10) 923 50 1100 84 70-130 <br /> Surrogate Toluene-d8 16 4 250 106 60-140 <br /> Surrogate 4-BFB 256 25 0 101 60-140 <br /> Batch 3050449-EPA 5030B {P/TI �� <br /> Blank(3050449-BLKI) Prepared&Analyzed 05/27/03 <br /> Benzene ND 0 50 ug/1 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate Toluene-d8 241 250 96 60-140 <br /> Surrogate 4-BFB 238 15 0 95 60-140 <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 23 <br />