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l <br /> Sequoia 1455 McDowell Blvd,North ate D <br /> • Petaluma,CA 94954 � <br /> Analytical (707)792-1865 FAX(707)792-0342342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Protect Arco Site 2186,Stockton,CA P403321 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/29/04 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-3(P403321-03)Water Sampled 03/10/04 05 41 Received 03/15/04 08 40 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 4030659 03/23/04 03/23/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 124% 84-122 Sol <br /> Surrogate 12-Dichloroethane-d4 147% 74-135 Sol <br /> rogate Toluene-6`8 97% 84-119 " <br /> IlWogate 4-Bromofluorobenzene 105% 86-119 " <br /> MW4(P403321-04)Water Sampled 03/10/04 04 09 Received-03/15/04 08 40 <br /> Tert-amyl methyl ether ND - 200 ug/1 200 4030659 03/23/04 03/23/04 EPA 8260B <br /> Benzene ND 100, It 1. 11 11 " <br /> Tcrt-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 <br /> 1,2-Dichloroethane ND 100 " <br /> Ethanol ND J 20000 " <br /> Ethylbenzene ND 100 <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether shy —6900 100 <br /> Toluene ' SiJ�Y9 �40 ND / 100 <br /> Xylenes(total) V 1n ND 100 " <br /> Surrogate Dibromofluoromethane 116% 84-122 <br /> Surrogate 12-Dichloroethane-d4 }7 9 CI38% 74-135 Sol <br /> Surrogate Toluene-d8 93 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 96% 86-119 " <br /> quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise staled results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> page 6 of 15 <br />