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819 Sinker Ave Ste 8 <br /> Sequoia Sacramento,CA 95894 <br /> (916)921-9600 <br /> FAX(916)92 1-0100 <br /> Analytical www sequoialabs cum <br /> 7r-Ryan-Dublin Project Former Unocal 5098, Stockton,CA S302592 <br /> 747 Sierra Court,Ste J Project Nwnber NIA Reported <br /> ubltn CA,94568 Project Manager Deanna L Harding 03/10/03 17 17 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> aiyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> _W-7(S302592-07)Water Sampled 02/18/03 14 25 Received 02/24/03 15 30 _ <br /> Benzene ND 050 ug/l 1 3020415 02/28/03 02/28/03 EPA 82608 <br /> Iluene ND 050 " <br /> hylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> ethyl tent-butyl ether ND 2 0 " <br /> rogate 1,2-DCA-d4 93 % 60-140 <br /> krrogate <br /> Toluene-d8 112% 60-140 " <br /> trrogate 4-BFB 106% 60-140 " <br /> W-8D(5302592-08)Water Sam led 02/20/03 13 55 Recen ed 02/24/03 15 30 <br /> 13enzene 5 2 050 ugtl 1 3030088 03/06/03 03/06/03 EPA 8260B <br /> Ioluene 1 2 050 " <br /> thIbenzene 1 4 050 <br /> ylenes(total) 6 0 050 " <br /> Meth l tert-butyl ether ND 2 0 " <br /> pate 12-DCA-d4 113 % 60440 " <br /> rrogale Toluene-d8 110 % 60-140 " <br /> Surrogate 4-BFB 99% 60-140 " <br /> W-9 S302592-09 Water Sampled 02/20/03 13 20 Received 02/24/03 15 30 <br /> enzene 0 59 050 ug/l 1 3030088 03/06/03 03/06/03 EPA 82608 <br /> Toluene 1 1 050 " <br /> tthylbenzene 0 50 050 " <br /> ylenes(total) 1 9 050 " <br /> Methyl tert-butyi ether ND 20 " <br /> lurrogate 1,1-DCA-d4 118 % 60-140 " <br /> urrogate Toluene-d8 117% 60-140 " <br /> uriogate 4-BFB 100 % 60-140 " <br /> la Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain o/ <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 11 of 126 <br />