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819 Striker Avenue Suite 8 <br /> 4D Sequoia Sacrame(916)A 95834 <br /> 921-9600 <br /> FAX 00 <br /> Analytical wwseq 6ialabs om <br /> Y www sequoialabs com <br /> SECpR International-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/17/02 11 52 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analyhcal- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-8M(S206162-01)Water Sampled 06/12/02 09 40 Received 06/13/02 11 10 <br /> Tert-butyl alcohol ND 25 ug/l 5 2060151 06/13/02 06/14/02 EPA 8260B <br /> Methyl tert-butyl ether 70 25 " <br /> Di-isopropyl ether ND 25 " <br /> Ethyl tert-butyl ether ND 25 " <br /> Tert-amyl methyl ether ND 25 " <br /> Ethanol ND 250 " <br /> 1,2-Dichlomethane ND 25 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> Surrogate 1 1-DCA-d4 108% 60-140 " <br /> MW-8D(S206162-02)Water Sampled 06/12/02 10 50 Received 06/13/02 11 10 <br /> Tert-butyl alcohol ND 25 ug/l 5 2060151 06/13/02 06/14/02 EPA 8260B <br /> Methyl tert-butyl ether 46 25 " <br /> Di-isopropyl ether ND 2 5 " <br /> Ethyl tert-butyl ether ND 250 " <br /> ert-amyl methyl ether ND 25 " <br /> thanol ND 250 " <br /> 1,2-Dichloroethane ND 25 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> Surrogate 1 2-DCA-d4 108% 60-140 " <br /> MW-9M(S206162-03)Water Sampled 06/12/02 13 50 Received 06/13/02 11 10 _ <br /> Tert-butyl alcohol ND 50 ug/1 10 2060151 06/13/02 06/14/02 EPA 8260B <br /> Methyl tert-butyl ether 44 50 " <br /> Di-isopropyl ether ND 50 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Tert-amyl methyl ether ND 50 " <br /> Ethanol ND 500 " <br /> 1,2-Dichloroethane ND 5 0 " <br /> 1,2-Dibromoethane(EDB) ND 5 0 " <br /> Surrogate 12-DCA-d4 111 % 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 4 of 9 <br />