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a__ � <br /> 1455 McDowell Blvd North SteSequi oia j Petaluma,CA 94951865 44Analytical FAX(707)792_AX(707)792 0342342 <br /> rvww sequoiala6s wm <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P412405 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 0111 1105 10 44 <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-3(P412405-03)Water Sampled 12/21/04 19 05 Received 12/22/0413 15 <br /> Tert-amyl methyl ether ND 10 ugll 1 5010028 01/04/05 01/04/05 EPA 82608 <br /> Benzene ND 050 " " „ <br /> Tert-butyl alcohol ND 20 11 " " <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 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 102% 84-121 " <br /> Surrogate 1,2-Drchloroethane-d4 114% 74-135 " <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 110% 86-119 " <br /> MW4(P412405-04)Water Sampled 12/21/04 16 35 Received 12/22/04 13 15 <br /> Tert-amyl methyl ether ND 250 ugh 250 5010028 01/04/05 01/04/05 EPA 8260B <br /> Benzene ND 120 " <br /> Tort-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dibromoethane(EDB) ND 120 " <br /> 1,2-Dichloroethane ND 120 " <br /> Ethanol ND 25000 " <br /> Ethylbenzene ND I20 " <br /> Ethyl tert-butyl ether ND 250 " <br /> Methyl tert-butyl ether 2800 i 120 " <br /> Toluene ND 120 " <br /> Xylenes(total) ND 120 " <br /> Surrogate Dibromofluoromethane 99% 84-111 " <br /> Surrogate 1,2-Dichloroethane-d4 111% 74-135 " <br /> Surrogate Toluene-d8 101 % 84-119 " <br /> Surrogate 4-Bromofluorobenzene 103% 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 8of18 <br />