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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925) 988-9600 <br /> FAX(925) 988-9673 <br /> Analytical www sequolalabs c <br /> Gettler Ryan,hie -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Pro)ec,t Number Tosca#1 11192 Reported <br /> Dublin CA, 94568 Project Manager Doug Lee 10-May-01 10 33 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Walnut Creek <br /> Reporting <br /> Analyte Result Limit Umts Dilution Batch Prepared Analyzed Method Note] <br /> B-2 (W104573-04)Water Sampled 24-Apr-01 00 00 Received 26-Apr-01 16 00 <br /> Ethanol ND 500 ug/i 1 1E07003 07-May-01 08-May-01 EPA 8260B <br /> tert-Butyl alcohol ND 20 <br /> Methyl tent-butyl ether 15 20 " <br /> Di-i,sopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tent-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 <br /> Ethylene dtbrornide ND 20 <br /> Surrogate Dibromofluoromethane 878% 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 806% 50-150 <br /> B-3 (W104573-05)Water Sampled 24-Apr-01 00 00 Received 26-Apr-01 16 00 <br /> Ethanol ND 500 ug/l 1 IE07003 07-May-01 07-May 01 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 " <br /> Ethylene dlbromide ND 20 " <br /> Surrogate Dibromofluoromethane 902% 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 824% 50-150 " <br /> 134 (W104573-06)Water Sampled 24-Apr-01 00 00 Received 26-Apr-01 16 00 <br /> Ethanol ND 500 ug/I l IE07003 07-May-01 08-May-01 EPA 8260B <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tort-butyl ether 11 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 <br /> 1,2-Dii,hloroethane ND 20 <br /> Ethylene dibromtde ND 20 <br /> Surrogate Dtbtontofluoroniethane 880% 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 804% 50-150 <br /> Sequoia Analytical -Walnut Creek The results in this report apply to the samples analyzed tri accordance with the chard <br /> custody document This analytical report must be reproduced in its entiretj <br /> Page 3 of 11 <br />