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1455 McDowell Bled, Ah Ste <br /> Sequoia Petaluma,CA 949544 <br /> Analytical <br /> Lica (707)742-1865 <br /> FAX(707)792-0342 <br /> WWW sequoialabs corn <br /> • <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Pruject 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 /> Analyle Result bout Units Dilution Batch Prepared Analyzed Method Note <br /> MW-6(P504013-06)Water Sampled 03/30/0510 00 Received 03/31/0512 45 <br /> Tert-amyl methyl ether ND 1 0 ug/1 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 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 97% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 93% 74-135 " <br /> urrogale Toluene-d8 93% 84-119 <br /> Surrogale 4-Bromofluorobenzene 100% 86-119 <br /> MW-7(P504013-07)Water Sampled 03/30/05 10 52 Received 03/31/05 12 45 <br /> "Pert-amyl methyl ether ND 1 0 ugA 1 5040112 04/13/05 04/13/05 EPA 8260B <br /> Benzene ND 0 50 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 94% 84-122 " <br /> Surrogate 1,2-D:chloroethane-d4 92% 74-135 " <br /> Surrogate Toluene-d8 91 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 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 8 of 20 <br />