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1455 McDowell Blvd North Ste D <br />— Sequoia Petaluma CA 94954 <br /> 0792-1865_____ <br /> Analytical FAX(707) lab 0342 <br /> www squoiquoiaabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P411271 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 11/15/04 13 28 <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 /> 6100EFF2111104(P411271-02)Air Sampled 11/11/04 07 05 Received 11/12/04 09 00 <br /> Tert-amyl methyl ether ND 10 mg/m'Air 1 4110355 11/12/04 11113104 EPA 8260B <br /> 0058 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 117% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 121 % 74-135 <br /> Surrogate Toluene-d8 108% 84-119 i <br /> amyl methyl ether ND 024 ppmv " <br /> ene ND 016q1W <br /> ert-butyl alcohol ND 6 6 " <br /> Di-isopropyl ether ND 024 " <br /> Ethylbenzene ND 012 " n " <br /> Ethyl tert-butyl ether ND 024 " <br /> Methyl tent-butyl ether ND 014 " <br /> Toluene ND 013 " <br /> Xylenes(total) ND 012 " <br /> Surrogate Dibromofluoromethane 117% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 121 % 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> uola 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 5 of 10 <br />