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4 Sequoia 1455 McDowell Blvd,North ate D <br /> Petaluma,CA 94954 <br /> Analytical (707)792-0365 <br /> FAX(707)792-0342 <br /> www sequolalabs cum <br /> URS Corp-Sacramento Protect Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/07/041 658 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(P312285-05)Water Sampled 12/09/03 03 24 Received 12/10/03 09 00 <br /> Tert-amyl inethyl ether ND 1 0 ug/l 1 3120631 12/22/03 12/23/03 EPA 8260B <br /> Benzene ND 050 ^ " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <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) 079 050 <br /> Surrogate Dtbromofluoromethane 102% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d892% 84-119 " <br /> urrogate 4-Bromol7uorobenzene 100% 86-119 " <br /> MW-6(P312285-06)Water Sampled 12/09/03 04 17 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 20 ue 2 3120631 12/22/03 12/23/03 EPA 8260E <br /> Benzene ND 10 ^ <br /> Tert-butyl alcohol 78 40 " <br /> Di-isopropyl ether ND 20 " <br /> Ethanol ND 200 " <br /> Ethylbenzene ND 10 ^ <br /> Ethyl tert-butyl ether ND 20 ^ <br /> Methyl tert-butyl ether 91 10 ^ <br /> Toluene ND 10 ^ ^ <br /> Xylenes(total) ND 10 1. n " <br /> Surrogate Dibromofluoromethane 99% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 104% 74-135 " <br /> Surrogate Toluene-d8 89% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 98% 86-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 13 of 35 <br />