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'� i455 McDowell Blvd North Ste D Sequoia Petaluma CA 94954 a_ (707)792-1865 Analytical wFAXww (707)792-0342 ler-Ryan/Geostrategies(l) Project Unocal(4) Sierra Court, Suite j Project Number Former Unocal#0187 Stockton Reported. Win CA 94568 Project Manager Deanna Harding 05/24/02 16 38 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analvte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-5 L205039-05Water Sampled 05/47/02 12 05 Received-05/09/02 18 50 Tert-butyl alcohol ND 20 ug/I 1 2050026 05/13/02 05/13/02 BPA 8260B Methyl tert-butyl ether ND 1 0 Di-isopropyl ether ND 1 0 " Ethyl tert-butyl ether ND 1 0 Ten-amyl methyl ether ND 1 0 Surrogate 1,2-Dichloroelhone-d4 101 % 70-130 " U-6(L205039-06)Water Sampled 05/07/02 11 30 Received 05/09/02 18 50 Tert-butyl alcohol ND 20 ugA 1 2050026 05/13102 05113/02 EPA 8260B Methyl tert-butyl ether ND 1 0 Di-isopropyl ether ND 1 0 Ethyl tert-butyl ether ND 1 0 Tert-amyl methyl ether ND 10 ^ Surrogate 1,2-Dichloroeihane-d4 101 % 70-130 " U-7(L205039-07)Water Sampled 05/07/02 13 20 Received- 05/09/02 18 50 0 utyl alcohol ND 20 ugA 1 2050026 05/13/02 05/13/02 EPA 82601 tert-butyl ether ND 1 0 " Di-isopropyl ether ND 1 0 Ethyl tert-butyl ether ND 1 0 Tert-amyl methyl ether ND 1 0 Surrogate 1,2-Dichloroethane-d4 103% 70-130 " U-8(L205039-08)Water Sampled 05/07/02 14 25 Received 05/09/02 18 50 Tert-butyl alcohol . ND 20 ug/l 1 2050026 05/13/02 05/13/02 EPA 8260B Methyl tert-butyl ether ND 1 0 Di-isopropyl ether ND 1 0 " Ethyl tert-butyl ether ND l 0 Teri-amyl methyl ether ND 1 0 Surrogate 42-Dichloroethane-d4 101 % 70-130 is Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entireq, I Page 15 of 30