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• 404 N Wiget Lane Sequoia WalnutCreek,( �9�o FAX (925)988-9673 Analytical ww w.sequolalabs com er Ryan,Inc -Dublin Project Tosco 47 Sierra Court Suite J ProJectNumber Tosco 4 5886 Reported Dublin CA,94568 Project Manager Deanna L Harding 28-Feb-01 07 25 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical -Walnut Creek Reportung Analyte Result Lunrt Units Dilution Batch Prepared Analyzed Method Notes MW-1 (W102175-02)Water Sampled 06-Feb-01 13 50 Received 07-Feb-01 16 40 Ethanol ND 5000 ug/I 10 1813024 14-Feb-01 14-Feb-01 EPA 8260B tert-Butyl alcohol ND 500 Methyl tert-butyl ether 3700 20 DI-isopropyl ether ND 20 " Ethyl tent-butyl ether ND 20 tent-Amyl methyl ether ND 20 " 1,2-Dichloroethane ND 20 Ethylene dtbromtde ND 20 " Surrogate Dibromofluoromethane 114 % 50-150 " Surrogate 1,2-Dichloroethane-d4 103 % 50-150 " MW-2(W 102175-03)Water Sampled 06-Feb-01 15 00 Received 07-Feb-01 16 40 Ethanol ND 10000 ug/l 20 1B13024 13-Feb-01 14-Feb-01 EPA 8260B tert-Butyl alcohol ND 1000 " Methyl tert-butyl ether 6300 40 " Jftpropyl ether ND 40 flWtert-butyl ether ND 40 " tent-Amyl methyl ether ND 40 1,2-Dlchloroethatne ND 40 Ethylene dibronude ND 40 " Surrogate Dibromofluoromethane 114 % 50-150 " Surrogate 1,2-Dichloroethane-l4 109 % 50-150 " MW-3(W102175-04)Water Sampled 06-Feb-01 14 25 Received 07-Feb-01 16 40 Ethanol ND 25000 U0 50 1B13024 13-Feb-01 13-Feb-01 EPA 9260B tert-Butyl alcohol ND 2500 Methyl tent-butyl ether 18000 100 " Dl-isopropyl ether ND 100 " Ethyl tert-butyl ether ND 100 " tert-Amyl methyl ether ND 100 " 1,2-Dlchloroethane ND 100 Ethylene dibronude ND 100 " Surrogate Dibromofluoromethane 113 % 50-150 Surrogate 1,2-Drchloroethane-d4 107% 50-150 " Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of custody document Thus analytical report must be reproduced in its entirety Page 2 of 29