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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (D (707)792-1865 <br /> Analytical FAX(707)M-4342 <br /> www sequoialahs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 1134 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Ihlution Batch Prepared Analyzed Method Note <br /> MW-1 (P412423-01)Water Sampled 12/20/0412 45 Received 12/23/0410 30 <br /> Tert-amyl methyl ether ND 1 0 ug/1 1 5010012 01/03/05 01/03/05 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 ter(-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 ^ " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 ^ <br /> Surrogate Drbromofluaromethane 98% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 104% 84-119 " <br /> 0urragate 4-Bromofluorobenzene 104% 86-119 " <br /> MW-2(P412423-02)Water Sampled 12/20104 12 25 Received 12/23/04 10 30 <br /> Tert-amyl methyl ether ND 1 0 ug/l 1 5010012 01/03/05 01/03/05 EPA 8260E <br /> Benzene ND 050 ^ <br /> Tert-butyl alcohol ND 20 ^ <br /> Di-isopropyl ether ND 1 0 ^ <br /> 1,2-Dichloroethane 17 0 50 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether 060 0 50 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromo luoromethane 96% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 99% 74-135 " <br /> Surrogate Toluene-d8 106% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 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 6 of 33 <br />