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819 Sinker Ave Ste 8 - <br /> Sequoia Sacramento,CA95834 <br /> a)— (916)AnalyticalFAX 9219600 <br /> (916)921 0100 <br /> www sequotalabs com <br /> 10 <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA 5306625 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/30/03 13 04 <br /> Gasohne\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1R(S306625-01)Water Sampled 06/27/03 13 40 Received 06/30/0312 20 <br /> Benzene ND 050 ug/1 1 3070157 07/11/03 07/11/03 EPA 8260B <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether 88 2 0 " <br /> Gasoline(C6-C10) 130 50 HC-12 <br /> Surrogate Toluene-d8 82% 60-140 " <br /> Surrogate 4-BFB 88% 60-140 " <br /> MW-2R(S306625-02)Water Sampled 06/27/03 15 35 Received 06/30/03 12 20 <br /> Benzene ND 50 ug/l 10 3070157 07/11/03 07/11/03 EPA 8260E <br /> Toluene ND 50 " <br /> Ethylbenzene ND 5 0 " <br /> Xylenes(total) ND 5 0 " <br /> Methyl tert-butyl ether 340 20 <br /> Gasoline(C6-C10) ND 500 " <br /> Surrogate Toluene-d8 86% 60-140 " <br /> Surrogate 4-BFB 93% 60-140 " <br /> MW-3(S306625-03)Water Sampled 06/27/03 14 30 Received 06/30/03 12 20 - <br /> Benzene 14 050 ugll 1 3070157 07/11/03 07/11/03 EPA 8260B <br /> Toluene ND 050 11 " " <br /> Ethylbenzene 22 050 " <br /> Xylenes(total) 17 050 " <br /> Gasoline(C6-Ci0) 360 50 HC-19 <br /> Surrogate Toluene-d8 83% 60-140 " " " <br /> 11 <br /> Surrogate 4-BFB 88% 60-140 " <br /> I <br /> i <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 4 of 18 <br />