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`l Sequoia 1455 McDowell Blvd,North Ste D <br /> 4DPetaluma,CA 94954 <br /> ► Analytical (707)792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Cate-Sacramento Project Arco Site 2130,Stockton,CA P312285 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Protect Manager Vernon P Elarth 01/07/04 16 58 <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-3(P312285-03)Water Sampled 12/09/03 04 49 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ugA 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) ND 050 <br /> Surrogate Dibromofluoromethane 98% 84-111 <br /> Surrogate 11-Dichloroethane-d4 101% 74-135 <br /> 0urrogare Toluene-d8 88% 84-119 " <br /> urrogale 4-Bromofluorobenzene 91% 86-119 " <br /> MW4(P312285-04)Water Sampled 12/09/03 02 28 Received 12/10/03 09 00 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3120631 12/22/03 12/23/03 EPA 9260B <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) ND 050 ^ <br /> Surrogate Dibromofluoromethane 103% 84-111 <br /> Surrogate 1,1-Dichloroethane-d4 107% 74-135 " ^ <br /> Surrogate Toluene-d8 90% 84-119 <br /> Surrogate 4-Bromofluorobenzene 96% 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 /> basis This analytical report must be reproduced in its entirety <br /> Page 12 of 35 <br />