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/ � 1455 McDowd Sequoia Petaluma,CA 94954 l Blvd,North Ste 'jL.�r�\A 4 '%WAnalytical (707)792-1865 FAX(707)792-0342 www sequoiaiabs com ler-Ryan/Geostratep-ies(1) Project Unocal(4) Sierra Court, Suite 1 Protect Number Former Unocal 40187,Stockton Reported Dublin CA,94568 Protect Manager Deanna Harding 05/24/02 16 38 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Lunn Units Dilution Batch Prepared Analyzed Method Notes NP-1-111 (1.205039-29)Water Sampled 05/09/02 13 20 Received 05/09/02 18 50 Teri-butyl alcohol ND 20 ug/I I 2050034 05/15/02 05/15/02 EPA 82608 Methyl ter(-butyl ether ND 1 0 " Di-isopropyl ether ND 1 0 " Ethyl tert-butyl ether ND l 0 " Tert-amyl methyl ether ND 10 Surrogate 12-Dichloroethane-d4 968% 70-130 " NP-2-22(L205039-30)Water Sampled 05/09/02 11 05 Received 05/09/02 18 50 Tert-butyl alcohol ND 20 ug/l 1 2050034 05/)6/02 05/16/02 EPA 8260B Metbyl tert-butyl ether 19 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 964 % 70-130 NP-2-60(L205039-31)Water Sampled 05/09/02 11 45 Received 05/09/02 1S 50 R-05 tyl alcohol ND 670 ug/l 33 3 2050034 05/15/02 05/15/02 EPA 8260B 1 tent-butyl ether ND 33 " Di-isopropyl ether ND 33 ^ Ethyl tert-butyl ether ND 33 " Tert-amyl methyl ether ND 33 ^ Surrogate 1,2-Dichloroethane-d4 902 % 70-130 " NP-2-116(L205039-32)Water Sampled 05/09/02 10 35 Received 05/09/02 18 50 _ Ter(-butyl alcohol ND 20 ug/1 1 2050034 05/15/02 05/15/02 EPA 82608 Methyl tent-butyl ether ND 1 0 Do-isopropyl ether ND 1 0 " Ethyl tent-butyl ether ND 1 0 " Tert-amyl methyl ether ND 1 0 ^ " Surrogate 1 2-Dichloroethane-d4 902 % 70-130 " $ is Analytical -San Carlos The results to this report apply to the samples analyzed in accordance with the chain of Custody document This analytical report must be reproduced in its entirety Page 21 of 30