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r � , <br /> Sequoia 14�5McDowell BlNCA94Ste D••r1r��'] Petaluma CA 949.)4 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0,42 <br /> www sequoialabs ca <br /> URS Corp-Sacramento Project Arco Site 6I00,Tracy,CA P505120 <br /> 2870 Gate,.vav Oaks Drive Suite 300 Project Number GO9JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19/05 11 20 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result y Limit Units Dilution Batch Prepared Analyzed Method Mote <br /> 6100 A SYS EFF(P505120-03)Air Sampled 05/16/051035 Received 05/16/051253 <br /> Tert-amyl methvl ether ND 10 mg/ml Air 1 5050092 05/17/05 05/17/05 EPA 8260B <br /> 14 38 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 113% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 171 % 74-135 " <br /> Surrogate Toluene-d8 93% 84-119 " <br /> Tert-amyl methyl ether ND 024 ppmv <br /> Benzene ND 016 " <br /> Tert-butyl alcohol ND 6 6 " <br /> Di-isopropyl ether ND 024 " <br /> Ethylbenzene ND 0 12 " <br /> Ethyl tert-butyl ether ND 024 " <br /> Methyl tert-butyl ether T f --T �ND 0 14 <br /> Toluene ND 013 " <br /> Xylenes(total) — _ _ —- __ -�ND - 012 <br /> Surrogate Dibromofluoromethane 113% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 111 % 74-135 " <br /> Surrogate Toluene-d8 93% 84-119 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless oihenvise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of l I <br />