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i <br /> 819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA95834 <br /> 1 <br /> 4W Analytical FAX(916)921 9600 <br /> (916)921 0 100 <br /> www sequoialabs com <br /> SECOR International--Rancho Cordova Project TOSCO 11193, Stockton,CA S304255 <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/29/03 08 52 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %R1;C RPD <br /> Analyte Result Limit Units Level Result ' %REC Limits RPD Limit Notes <br /> Batch 3040319-EPA 5030BJP/T1 <br /> Blank(3040319-BLKI) Prepared&Analyzed 04/18/03 _ <br /> Benzene ND 050 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-C 10) ND 50 " <br /> Surrogate Toluene-d8 - 248 - " 15 0 99 60`140 <br /> Surrogate 4-BFB 225 25 0 90 60-140 <br /> Blank(3040319-BLK2) s Prepared&Analyzed 04/19/03 <br /> Benzene ND 0 50 ug/l <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 " <br /> _ Xylenes_(tota1) _ _ _ ND_ _y 0 50 <br /> Methyl tert-butyl ether ND 2 0 <br /> Gasoline(C&C1O) ND 50 " <br /> Surrogate Toluene-d8 248 15 0 99 60-140 <br /> Surrogate 4-BFB 23 8 25 0 95 60-140 <br /> Laboratory Control Sample(3040319-BS1)�__ Prepared&Analyzed 04/18/03 <br /> Benzene 13 4 0 50 uO 13 6 99 70-130' <br /> Toluene 77 9 050 83 4 93 70-130 <br /> Methyl tert-butyl ether 182 2 0 22 4 81 60-140 <br /> Gasoline(C6-CIO) 1240 50 1100 113 70-130 <br />- Surrogate Toluene-d8 25 2 25 0 101 60-140 <br /> Surrogate 4-BFB 238 15 0 95 60-140 <br /> Laboratory Control Sample(3040319-BS2) _ Prepared 04/19/03 Analyzed 04/20/03 <br /> Benzene 149 050 ug/I 13 6 110 70-130 <br /> Toluene 824 050 83 4 99 70-130 <br /> Methyl tert-butyl ether 270 2 0 22 4 121 60-140 <br /> Gasoline(C6-C10) 1190 50 1100 108 70-130 <br /> Sequoia Analytical-Sacramento 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 /> Page 12 of 19 <br />