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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> Analytical (707)792_1865 <br /> FAX(707)792-0342 <br /> www sequwafabs coin <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Dnve 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 /> Analyte Result limit Units Dtlutton Batch Prepared Analyzed Method Note <br /> VW-2B(P504013-10)Water Sampled 03/30/0513 35 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 20 ugh 2 5040112 04/13/05 04/13/05 EPA 8260E <br /> Benzene ND 10 " <br /> Tert-butyl alcohol ND 40 " <br /> Di-isopropyl ether ND 2 0 " <br /> 1,2-Dibromoethane(EDB) ND 1 0 " <br /> 1,2-Dichloroethane ND 10 <br /> Ethanol ND 200 " <br /> Ethylbenzene ND 10 " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether 43 1 0 <br /> Toluene ND 10 " <br /> Xylenes(total) ND 1 0 " <br /> Surrogate Dibromofluoromethane 91 % 84-112 " <br /> Surrogate 1,2-Dichloroethane-d4 88% 74-135 " <br /> Surrogate Toluene-d8 92% 84-119 <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 <br /> VW-31D(P504013-11)Water Sampled 03/30/05 17 39 Received 03/31/05 12 45 <br /> Tert-amyl methyl ether ND 1 0 ug/l 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-Dibromocthane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane 077 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 <br /> Methyl tert-butyl ether 3 2 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 101 % 74-135 " <br /> Surrogate Toluene-d8 92% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 102% 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 entrreiy <br /> Page 10 of 20 <br />