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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> 4D (707)792-1865 <br /> ► Analytical www <br /> seq 7) labs Co 2 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 5469,Stockton,CA P412205 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0290 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/01/05 14 06 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-7(P412205-07)Water Sampled 12/09/04 03 44 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 10 u8/1 1 4120414 12/20/04 12/20/04 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane 17 050 <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tent-butyl ether 090 050 <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromojluoromethane 99% 84-122 <br /> arrogate 1 2-Dichloroethane-d4 108% 74-135 <br /> rrogate Toluene-d8 98% 84-119 <br /> Surrogate 4-Bromol'uorobenzene 105% 86-119 <br /> MW-8(P412205-08)Water Sampled 12/09/04 04 32 Received 12/09/04 09 20 <br /> Tert-amyl methyl ether ND 1000 ug/1 1000 4120463 12/22/04 12/22/04 EPA 8260B <br /> Benzene 1400 500 <br /> Tert-butyl alcohol ND 20000 <br /> Di-isopropyl ether ND 1000 " <br /> 1,2-Dibromoethane(EDB) ND 500 " <br /> 1,2-Dichloroethane ND 500 <br /> Ethanol ND 100000 <br /> Ethylbenzene ND 500 " <br /> Ethyl tert-butyl ether ND 1000 " <br /> Methyl tert-butyl ether 23000 500 " <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 <br /> Surrogate Dibromojluoromethane 96% 84-122 <br /> Surrogate 12-Dichloroethane-d4 101 % 74-135 <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Surrogate 4-Bromolluorobenzene 100% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> • custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 21 <br />