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l Blvd North Ste D <br /> D— Sequoia 1455 McDowPetaaluma CA 94954 <br /> 86 3 <br /> Analytical (707)792 1342 <br /> • FAX 707 labs co 2 <br /> wtnv sequoiala6s com <br /> URS Corp-Sacramento ProjeLt Arco Site 6100,Tracy,CA P505120 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manaeer Jav Johnson 05/19/05 11 20 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Uruts Dilution Batch Prepared Analyzed Method Note <br /> 6100 A SYS INF(PS05120-02)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 2260B <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 1,2-Drchloroethane-d4 123 % 74-135 " <br /> Surrogate Toluene-d8 100 % 84-119 " <br /> amyl methyl ether ND 48 ppmv 200 <br /> on " <br /> zene 38 32 " <br /> Tert-butyl alcohol ND 1300 " <br /> Di-isopropyl ether ND 48 " <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 12-Drchloroethane-d4 123 % 74-135 " <br /> Surrogate Toluene-d8 107 % 84-119 <br /> quoia Analytical-Petaluma The results rn this report apply to the samples analyzed to accordance wrth the chain of <br /> custody document Unless othenvise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 11 <br />