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3455 McDowell Blvd, Ste D <br /> Sequoia petaluma,CA CA 94954 <br /> 1W792-1865 <br /> Analytical (707 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Stte 6020,Manteca,CA p305040 <br /> 2870 Crateway Oaks Dnve Suite 300 Protect Number WR36616 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P F a, 05/15/03 20 19 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analyheal-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-9(P305040-05)Water Sampled 04/28/03 15.45 Received 05/01/03 16 00 <br /> Tert-amyl methyl ether ND l 0 ug/l 1 3050181 05/07/03 05/07/03 EPA 8260B <br /> Vert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Surrogate Dibromofluoromethane 95% 84-122 " <br /> Surrogate I2-Dichloroethane-d4 91 % 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> MW-10(P305040-06)Water Sampled 04/28/03 15 20 Received 05/01/03 16 00 <br /> Tcrt-amyl methyl ether ND 10 ug/l 1 3050181 05/07/03 05/07/03 EPA 8260B <br /> Tert-butyl alcohol ND 20 " " <br /> 0i-isopropyl ether ND 10 " <br /> 2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethyl tent-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 96% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 90% 74-135 " <br /> Surrogate Toluene-d8 99% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • of custody document Unless otherwise slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 12 <br />