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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-186565 <br /> Analytical FAXequoi labsc42 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> JAnalyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-8(P504013-08)Water Sampled 03/30/05 16 14 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 5040112 04/13/05 04/13/05 EPA 8260E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 0 50 " <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) 075 0 50 " <br /> Surrogate Drbromofluoromethane 99% 84-112 " <br /> Surrogate 12-Dichloroethane-d4 99% 74-135 <br /> urrogate Toluene-d8 91% 84-119 <br /> Surrogate 4-Bromofluorobenzene 97% 86-119 <br /> VW-1113(P504013-09)Water Sampled 03/30/0514 30 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 1 0 ugll 1 5040112 04/13/05 04/13/05 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane 13 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 15 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 101% 74-135 " <br /> Surrogate Toluene-d8 94% 84-119 <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 20 <br />