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Sequoia 819 Striker Ave Ste B a Sacramento,CA 95834 {916)921-9600 Analytical FAX(916)uoia]a .0100 u�ww.seqoialaba.eom -Ryan-Dublin Project: Former Unocal 0187,Stockton,CA 5306048 6 7 Sierra Court,Ste.J Project Number. NIA Reported: Dublin CA,94568 Project Manager. Deanna L.Harding 06/16/03 15:43 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical- Sacramento Reporting Analyte Result Limit Units Dilution $etch Prepared Analyzed Method Notes U-13(S306048-]4)Water Sampled: 05/28/0309:35 Received: 06/02/03 13:40 _ Tert-butyl alcohol ND 5.0 ug/1 1 3060093 06/05/03 06/06/03 EPA 8260B Methyl Cert-butyl ether 0.53 0.50 " Di-isopropyl ether 0.62 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate:1,2-DCA-d4 94% 60-140 " U-14(S306048-15)Water Sampled:05/30/03 11:40 Received:06/02/03 13:40 - Tert-butyl alcohol ND 5.0 ug/l 1 3060167 06/11/03 06/11/03 EPA 82608 Methyl tent-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 105% 60-140 " UdIL(S306048-16)Water Sam led:05/3010312:30 Received:0610210313:40 FRIWutyl alcohol ND 5.0 uVA 1 3060167 06/11/03 06/12/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 83% 60-140 " U-16(5306048-17)Water Sampled:05/28/03 13:55 Received:06/02/03 13:40 Tert-butyl alcohol ND 5.0 ug/I 1 3060093 06/05/03 06/06/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether 0.64 0.50 " Ethyl tert-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 " Surrogate: 1,1-DCA-d4 101 % 60-140 " oia 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 basis. This analytical report must be reproduced in its entirety. Page 18 of 32 a