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819 Striker Avenue,Suite 8 Sequoia Sacramento 95834 (916))921-9600 Analytical FAX(916)921-0100 www sequoialabs com 7 elta Envlronmental Consultants(Cameron Park) Project ARCO 2186,Stockton,CA 3330 Cameron Park Dr Ste 550 Project Number N/A Reported Cameron Park CA,95682 Project Manager Jay Johnson 10/08/01 15 39 Volatile Organic Oxygenated Compounds by EPA Method 8260B Sequoia Analytical - San Carlos Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW1-45'(S109222-01)Water Sampled 09/13/01 15 22 Received 09/14/01 10 17 Tert-butyl alcohol ND 2500 ug/l 25 1090106 09/26/01 09/26/01 EPA 8260B Methyl tert-butyl ether 4500 50 " Di-isopropyl ether ND 50 " Ethyl tert-butyl ether ND 50 " Tert-amyl methyl ether ND 50 " Surrogate 1 2-Dtchloroethane-d4 966% 76-114 MW2-46'(5109222_02)Water Sampled 09/13/01 13 14 Received 09/14/01 10 17 Tert-butyl alcohol ND 100 ug/l 1 1090105 09/26/01 09/26/01 EPA 8260B Methyl tert-butyl ether ND 20 " Di-isopropyl ether ND 20 " Ethyl tert-butyl ether ND 20 Tert-amyl methyl ether ND 20 " Surrogate 12-Dtchloroethane-d4 102% 76-114 J2hMW3-45'(SI09222-03)Water Sampled 09/13/01 13 44 Received 09/14/01 10,17 'Wert-butyl alcohol ND 100 ug/1 1 1090106 09/26/Of 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 " Surrogate 12-Dtchloroethane-d4 962% 76-114 MW4-45'(5109222-04)Water Sampled 09/13/01 14 21 Received 09/14/01 10 17 Tert-butyl alcohol ND 5000 ug/1 50 1090106 09/26/01 09/26/01 EPA 8260E Methyl tert-butyl ether 7600 100 " Di-isopropyl ether ND 100 " Ethyl tert-butyl ether ND 100 " Tert-amyl methyl ether ND 100 " Surrogate 12-Dtchloroethane-d4 972% 76-114 " Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must he reproduced in its entirety Page Page 5 of 13