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819 Striker Ave Ste 8 Sequoia Sacramento,916)92 95834 (916}921.9600 FAX► Analytical wwseq 6} labsco2 1 0 www sequoialabs coin Gettler-Ryan-Dublin - Project Former Unocal 0187,Stockton,CA a 5302221 6747 Sierra Court,Ste`J Project Number NIA Reported Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19:02:: Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Sacramento - - Reporting - Analyte Result Limit Units Dilution Batch Prepared Analyzed Method !dotes U-17(S302221-18)Water Sampled 02/04/03 14 55 Received 02/07/03 10 30 Tert-butyl alcohol ' ND 100_ ug/l, - _ 1,- 3020220 02/18/03 02/18/03 EPA 8260B Methyl tert-butyl ether ND 20 " " Di-isopropyl ether ND 20 Ethyl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 " Surrogate 1,1-DCA-d4 102% 60-140 U-18(S302221-19)Water Sampled 02/06/03 17 10 Received 02/07/03 10 30 Tert-butyl alcohol - ND 100 ugA 1 3020263 02/19/03 02/20103 EPA 82608 Methyl tert-butyl ether ND 2 0 " _ Di-isopropyl ether ND 2 0 " Ethyl tert-butyl ether ND 2 0 " Tert-amyl methyl ether' ND 2 0 " Surrogate 1,1-DCA-d4 108% 60-140 " U-19 5302221-20 Water Saml2led02106/031745 Received 02/07/03 10 30- - Tert-butyl alcohol ND 100 ugll 1 3020288 02/20/03 02/20/03 EPA 8260E Methyl tert-butyl ether ND 2 4 " Di-isopropyi ether ND 2 0 " Ethyl tert-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 " Surrogate 1,1-DCA-d4 109% 60-140 " U:20-(S302221:21)Water--Sampled`02/05103 10 00-Received-02107/03 10 Tert-butyl alcohol T ND 100 ug/l - 1 3020233 02/19/03 02/19/03 EPA 8260E Methyl tert-butyl ether XND 2 0 " Di-isopropyl ether ND 2 0 Ethyl tent-butyl ether ND 2 0 " Tert-amyl methyl ether ND 2 0 Surrogate 1,1-DCA-d4 119% 60-140 f Sequoia Analytical - Sacramento The results in this i eport apply to the samples analyzed in accordance with the chain o custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety Page 19 of 33