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8 19 Sinker Ave Ste 8 <br /> Sequoia Sacramento,(916 95834 <br /> (916)92 921-9600 <br /> a— ) <br /> W Analytical wseFAx(916) o <br /> www quoialabs labs co com <br /> r-Ryan-Dublin Project TOSCO 11192,Stockton,CA S305429 <br /> 6747 Sierra Court,Ste J Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 05/29/03 17 15 <br /> Gasoline\BTEXIUxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW4 5305429-04 Water Sam led 05/14/03 15.45 Received 05/15/03 16 40 <br /> Benzene ND 0 50 ug/l 1 3050437 05/27/03 05/27/03 EPA 8260B <br /> Toluene ND 050 " " " " " " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether 19 20 <br /> Gasoline(C6-C10) ND 50 <br /> Surrogate Toluene-d8 104% 60-140 " <br /> Surrogate 4-BFB 102% 60-140 <br /> MW-5 5305429-05 Water Sam led 05/14/03 16 25 Received 05/15/03 16:40 <br /> Benzene ND 050 ug11 1 3050437 05/27/03 05/27/03 EPA 8260B <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Mhyl tert-butyl ether 7.6 20 <br /> W " 'n <br /> the(C6-Cl0) ND 50 " <br /> Surrogate Toluene-d8 111 % 60-140 " <br /> Surrogate 4-BFB 98% 60-140 <br /> MW-6(5305429-06)Water Sampled 05/141631510 Received 05/15/03 16 40 - <br /> Benzene ND 0 50 ug/l 1 3050437 05/27/03 05/27/03 EPA 8260E <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 2 0 <br /> Gasoline(C6-CIO) ND 50 " <br /> Surrogate Toluene-d8 112% 60-140 " <br /> Surrogate 4-BFB 100% 60-140voqu " <br /> oia 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 /> Thu analytical report must be reproduced in its entirety <br /> Page 4 of 23 <br />