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819 Striker Avenue,Suite 8 Sequoia Sacramento, 95834 (916))921-96009fi00 Analytical FAX(916)921 0100 WWW sequoialabs corn Delta Environmental Consultants(Cameron Park) Project ARCO 2186, Stockton,CA 3330 Cameron Park Dr Ste 550 Project Number NIA Reported Cameron Park CA,95682 Project Manager Jay Johnson 10/18/01 13 43 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical- San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MWS-45'(5109222-05)Water Sampled 09/I3/01 11 47 Received 09/14/01 10 17 Tert-butyl alcohol ND 100 ugll 1 1090106 09/26/01 09/26/01 EPA 8260E Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 " Surrozate 12-Dichloroethane-d4 106% 76-114 " MW6-45'(5109222-06)Water Sampled 02/13/0112 13 Received 09/14/01 10 17 Tert-butyl alcohol ND 100 ug/1 1 1090106 09/26/01 09/26/01 EPA 8260B Methyl tett-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 " Tert-amyl methyl ether ND 20 " Surrogate 1 2-Dichloroethane-d4 106% 76-114 " MW745'(5109222-07)Water Sampled 09/13/01 12 35 Received 09/14/01 10 17 Tert-butyl alcohol ND 100 ugA 1 1090106 09/26/01 09/26/01 EPA 8260B Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tent-butyl ether ND 20 " Tert-amyl methyl ether ND 20 " Surrogate 1,2-Dichloroethane-d4 111% 76-114 " VWIR45'(5109222-08)Water Sampled 09/13/01 15 01 Received 09/14/01 10 17 T Tort-butyl alcohol ND 710 ugll 7 14 1090106 09/26/01 09/26/01 EPA 8260E Methyl tert-butyl ether 1100 14 " Di-isopropyl ether ND 14 " Ethyl tert-butyl ether ND 14 " Tert-amyl methyl ether ND 14 " Surrogate 1 2-Dichloroethane-d4 106% 76-114 " Sequoia Analytical-Sacramento The results in this iepori apply to the samples analyzed in accordance with the chain 10 of custody document This analytical report must be reproduced in its entirety Page Page 6 of 13