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Sequoia C <br /> 404 N WiLane <br /> Walnut Creek CA <br /> 94598 <br /> (9Z5)988 9600 <br /> 4 Analytical -- _ - - = - FAX 988 9673 <br /> www sequoiequoialabs tom <br /> ecor-Rancho Cordova Project Arco <br /> 017 Kilgore Rd Ste N100 Project Number Arco#4932 Reported <br /> Rancho Cordova CA 95670 Project Manager Rusty Benkosky 26-Jul-01 12 27 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Walnut Creek <br /> Reporting <br /> talyte RLsull Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> 58-1,48'(W107170-07)Water Sampled 09-Jul-0I 00 00 Received 11-Jul-01 12 35 <br /> tButyl alcohol ND 20 ug/l I IG2001 l 20-Jul-01 20-Jul-01 EPA 826013 <br /> hyl tert-butyl ether 16 20 " <br /> Di-isopropyl ether ND 20 " <br /> yl tert-butyl ether ND 20 " <br /> -Amy] methyl ether ND 20 " <br /> -1)echloroethane 140 20 " <br /> Ethylene dibromide ND 20 " <br /> trogate Dibromojluoromethane 980% 50-150ogate 12-Dichloroethane-d4 940% 50-150 <br /> SB-1,68'(W107170-08)Water Sampled 09-Jul-010000 Received I1-Jul-01 12 35 <br /> I-Butyl alcohol ND 20 ugll I 1G20011 20-Jul-01 20-Jut-01 EPA 826013 <br /> thyl tert-butyl ether ND 20 " <br /> De-iso ropyl ether ND 20 " <br /> -butyl ether ND 20 " <br /> methyl ether ND 20 " <br /> 1,2-Dechloroethane ND 20 " <br /> J"ylene <br /> debromede ND 2 0rogateDrbromofluoromelhane 980% 50-150"gate 1,2-Dechloroethane-d4 960% 50-150 " <br /> 1 <br /> a Analytical- Walnut Creek 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 6 of 13 <br />