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8 19 ker Ste S Sequoia Sacramento,CA 583 (D (916)Sacramento,CA 45834 Analytical FAX 9210100 tWr (916)921 0100 www stquoialabs cam i SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA S306625 3017 Kilgore Road,Suite 100 Project Number N/A Reported Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/30/03 13 04 GasolineTTEXIOxygenates by EPA method 8260B Sequoia Analytical-Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-6(5306625-06RE1)Water Sampled 06/27/0314 55 Received 06/30/0312 20 Methyl tent-butyl ether 200 20 uO 10 3070157 07/11/03 07/11/03 EPA 8260B Surrogate Toluene-d8 84% 60-140 " Surrogate 4-BFB 92% 60-140 " MW-7(5306625-07)Water Sampled 06/27/03 12 05 Received 06/30/03 12 20 Benzene ND 0 50 ug11 1 3070157 07/11/03 07/11/03 EPA 8260B Toluene 1 2 050 Ethylbenzene ND 0 50 " Xylenes(total) 081 050 " Methyl tert-butyl ether 59 2 0 " Gasoline(C6-C10) ND 50 " Surrogate Toluene-d8 83% 60-140 " Surrogate 4-BFB 89% 60-140 " MW-8(5306625-08)Water Sampled 06/27/03 11 36 Received 06/30/03 12 20 Benzene ND 050 ug/1 1 3070157 07/11/03 07/11/03 EPA 8260B Toluene - - ND 050 " Ethylbenzene ND 0 50 " ---Xylenes(total) ND 0.50 " Methyl tert-butyl ether ND - - 2 0 Gasoline(C6-C10) ND 50 " Surrogate Toluene-d8 90% 60-140 " Surrogate 4-BFB 86% 60-140 " MW-9(S306625-09)Water Sampled 06/27/03 16 05 Received 06/30/0312 20 ---` Benzene_ ND 10 ug/l 2 3070157 07/11/03 07/11/03 EPA 8260E Toluene ~~�>— ND 10 " Ethylbenzene ND 10 " Xylenes(total) 4 3 to " Gasoline(C6-C10) 640 100 HC-19 Surrogate Toluene-d8 92% 60-140 Surrogate 4-BFB 88% 60-140 " Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight 10basis This analytical report must be reproduced in its entirety Page 6 of 19