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Sequoia I455 McDowell Blvd North Ste <br /> Petaluma CA 949544 <br /> 4D (707)792-1965 <br /> FAX 42 <br /> Analytical wwsequ7salabs am <br /> • ��vw sequoialabs coin <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 Now <br /> I <br /> 6100 A SYS IIF(P505120-02)Air Sampled 05/16/05 10 40 Received 05/16/05 12 53 <br /> Tert-amyl methyl ether ND 200 mg/m'Air 200 5050092 05/17/05 05/17/05 EPA 8260B <br /> 1549 <br /> Benzene 120 100 " <br /> Tert-butyl alcohol ND 4000 " <br /> Di-isopropyl ether ND 200 " <br /> Ethylbenzene ND 100 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Methyl tert-butyl ether ND 100 " <br /> Toluene 120 100 <br /> Xylenes(total) 110 100 <br /> Surrogate Dibromofluoromethane 118% 84-122 <br /> Surrogate 1,1-Dtchloroethane-d4 123% 74-135 <br /> Surrogate Toluene-d8 100% 84-119 <br /> ert-amyl methyl ether ND 48 ppmv 200 I' <br /> enzene 38 32 <br /> Tert-butyl alcohol ND 1300 " <br /> Di-isopropyl ether ND 48 " <br /> I <br /> Ethylbenzene ND 24 <br /> Ethyl tert-butyl ether ND 48 " <br /> Methyl tert-butyl ether ND 28 " <br /> Toluene 33 26 " <br /> Xylenes(total) 25 24 " <br /> Surrogate Dibromofluoromethane 118% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 123% 74-135 <br /> Surrogate Toluene-d8 101% 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 to its entirety <br /> Page 5 of 11 <br />