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819 Striker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> a— ) <br /> Analytical www sequoialahsCorn <br /> 69r-Ryan-Dublin Project TOSCO 11192,Stockton,CA 5305429 <br /> 7 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 <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> , 1 Result Luno Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-10 5305429-10 Water Sampled 05/14/0311 20 Received 05/15/03 16 40 <br /> Benzene ND 050 ug/l 1 3050437 05/27/03 05/28/03 EPA 8260E <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 0 50 <br /> Methyl tert-butyl ether ND 20 <br /> Gasoline(C6-C10) ND 50 <br /> Surrogate Toluene-d8 97% 60-140 <br /> Surrogate 4-BFB 104% 60-140 " <br /> MW-11 5305429-1] Water Sampled 05/14/03 13 10 Received-05/15/0316 40 <br /> Benzene ND 050 ug/l 1 3050466 05/26/03 05/28/03 EPA 82605 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether 110 2 0 " " " " " <br /> HC-19 <br /> me(C6-C10) 120 50 " <br /> " <br /> arrogate Toluene-d8 107% 60-140 R " <br /> Surrogate 4-BFB 95% 60-140 " <br /> MW-12 S305429-12 Water Sampled 05/1410317.25 Received 0511510316.40 <br /> Benzene ND 050 ug/1 1 3050466 05/28/03 05/28/03 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 105% 60-140 " <br /> Surrogate 4-BFB 93% 60-140ANIM <br /> mIMIlu " <br /> ora Analytical-Sacramento The results to this report apply to the samples analysed 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 entirety <br /> Page 6 of 23 <br />