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819 Striker Ave Ste 8 Sequoia Sacrrm34 (916)921-986M . 6,92 a- 5Q Analytical www.sequoialabs.com Gcttler-Ryan-Dublin Project: Former Unocal 0187, Stockton,CA S306048 6747 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 Batch Prepared Analyzed Method Notes U-25(S306048-26)Water Sampled:05129/_03 13:15 Received:06/02/03 13:40 „ Tert-butyl alcohol ND 5.0 ugA 1 3060110 06/06/03 06/06/03 EPA 8260B Methyl tert-butyl ether ND 0.50 " Di-Isopropyl ether 0.67 0.50 Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 124% 60-140 " U-26 5306048-2 Water Sampled:05128/0315:20 Received:0610210313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060110 06/06/03 06/06/03 EPA 8260B Methyl tent-butyl ether 4.6 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 108% 60-140 NP-1-22 5306048-28 Water Sampled:05/30/0313:00 Received:06102/0313:40 Tert-butyl alcohol ND 5.0 ug/l 1 3060184 06/11/03 06/12/03 EPA 82608 Methyl tert-butyl ether ND 0.50 Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 " Ten-amyl methyl ether ND 0.50 Surrogate:1,2-DCA-d4 76% 60-140 " NP-1-65 S306048-29 Water Sampled:05130/0314:00 Received: 06/02/0313:40 Tert-butyl alcohol ND 25 ug/1 5 3060184 06/11/03 06/12/03 EPA 8260B R-05 Methyl tert-butyl ether ND 2.5 R-05 Di-isopropyl ether ND 2.5 " R-05 Ethyl tert-butyl ether ND 2.5 R-05 Tert-amyl methyl ether ND 2.5 " R-05 Surrogate:1,2-DCA-d4 101 % 60-140 " Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain custody document. Unless otherwise stated,results are reported on a wet weight basis. This analytical report must be reproduced in its entirety. Page 21 of 32