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819 Sinker Ave Ste 6 <br /> Sequoia Sacramento CA 95814 A9600 <br /> (9 16)921 GOD <br /> FAX 2 1 Analytical www stquolalabs com <br /> r-Ryan-Dublin Project Former Unocal 5098,Stockton,CA S302592 <br /> 6 Sierra Court,Ste J Project Number NIA Reported <br /> Dublin CA,94568 Prosect Manager Deanna L Harding 03/10/03 17 17 <br /> GasoltneWEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> nalyte Result Lima Units Dilution Batch Prepared Analyzed Method Notes <br /> W-245 5302592-30 Water Sampled 02/21/03 11 15 Received 02/24/0315 30 <br /> Benzene 170 5 0 ug/i 10 3030088 03/06/03 03/07/03 EPA 8260B <br /> Ioluene ND 5 0 " <br /> thylberizene ND 5 0 <br /> ylenes(total) ND 5 0 " <br /> ethyl tert-butyl ether ND 20 <br /> ui rogate 1,2-DCA-d4 116% 60-140 <br /> urrogate Toluene-d8 118% 60-140 " <br /> Surrogate 4-BFB 100% 60-140 " <br /> LW-24D(5302592-31)Water Sampled 02/21/03 10 45 Received 02/24/03 15 30 <br /> Benzene ""— .- 1 9 050 ug/I 1 3030099 03/06/03 03/07/03 EPA 8260E <br /> Toluene ND 050 " <br /> thylbenzene ND 050 <br /> ylenes(total) ND 050 <br /> Methyl tert-butyl ether ND 2 0 " <br /> 1te> 1,2-DCA-d4 116% 60-140 " <br /> u ate Toluene-d8 116% 60-140 <br /> Suri ogate 4-BFB )02% 60-140 <br /> W-255 5302592-32 Water Sampled 02/18/03 16 15 Received 02/24/03 15 30 <br /> Benzene ND 050 ug/l 1 3020415 02/28/03 02/28/03 EPA 8260B <br /> Toluene ND 050 " <br /> thylbenzene ND 0 50 " <br /> ylenes(total) ND 050 <br /> 7viethyl tert-butyl ether ND 2 0 <br /> lurrogate 1,2-DCA-d4 98% 60-140 " <br /> uri ogate Toluene-d8 116% 60-140 " <br /> ui rogate 4-BFB 107% 60-140 " <br /> 1 <br /> sa Analytical -Sacramento The results in this report apple to thesamples analysed in accoi dance with the chain of <br /> I custody document Unless otherwise stated results are reported on a wet weigh basis <br /> This analytical report must be reproduced in its enitreb, <br /> IPage 19 of 126 <br />