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819 Striker Ave Ste 8 Sequoia Sacrarriento,CA958 (916) (916)921-960Q00 Analytical FAX 92 1.0100 www.sequoiequoiala6s.com -Ryan-Dublin Project: Former Unocal 0187,Stockton,CA S306048 6 7 Sierra Court,Ste,J Project Number: N/A 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 Batch Prepared Analyzed Method Notes U-5(S306048-06)Water Sampled: 05/30/03 10:15 Received:06102/0313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060167 06/11/03 06/11/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 " Teri-amyl methyl ether ND 0.50 " Surrogate:1.2-DCA-d4 92% 60-140 U-6 S306048-07 Water Sampled:05/30/0310:50 Received:06/0210313:40 Ten-butyl alcohol ND 5.0 ug/I 1 3060167 06/11/03 06/11/03 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 104% 60-140 " UiNW306048-08)Water Sampled:05128/0316:10 Received:06/02/0313:40 fqwutyl alcohol ND 5.0 ug/1 1 3060093 06/05/03 06105/03 EPA 8260B Methyl tent-butyl ether 4.3 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tent-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 " Surrogate: 1,2-DCA-d4 81 % 60-140 " U-8 5306048-09 Water Sampled:05/29/03 08:20 Received:06/02/03 13:40 Tert-butyl alcohol ND 5.0 ug/I 1 3060110 06/06/03 06/06/03 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 84% 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 16 of 32 ? i