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1455 McDowell Blvd North Ste D <br /> - ` 954 <br /> Se sora Petaluma, 94 <br /> �-� q (707)79 792-1865865 <br /> FAX(707) 2 <br /> . Analytical www sequoialabsr0m <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-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 Limit Units Dilution Batch Prepared Analyzed Method Note <br /> 6100 A SYS EFF(P505120-03)Air Sampled 05/16/0510 35 Received 05/16/05 12 53 <br /> Tert-amyl methyl ether ND 1 0 mg/ml Air 1 5050092 05/17/05 05/17/05 EPA 8260B <br /> 1438 <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 <br /> Di-tsopropyl ether ND 10 <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tent-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 0 50 <br /> Toluene ND 0 50 <br /> Xylenes(total) ND 050 <br /> Surrogate Dthromofluoromethane 113% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 111 % 74-135 <br /> Surrogate Toluene-d8 93% 84-119 " <br /> rt-amyl methyl ether ND 024 ppmv <br /> enzene ND 016 <br /> Tert-butyl alcohol ND 6 6 " <br /> Di-isopropyl ether ND 0 24 <br /> Ethylbenzene ND 0 12 " <br /> Ethyl tert-butyl ether ND 024 " <br /> Methyl tert-butyl ether ND 0 14 <br /> Toluene ND 013 <br /> Xylenes(total) ND 0 12 <br /> Surrogate Dibromofluoromethane 113% 84-122 <br /> 10 <br /> Surrogate 1,2-Drchloroethane-d4 III % 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 otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 11 <br />