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L T <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> 1a) (707)792-1865 <br /> Analytical www squoiquoiFAX e792 0342 <br /> alabs cum <br /> URS Corp-Sacramento ProJcct Arco Site 6100,Tracy,CA P409117 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 09/21/04 09 47 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units DLlUt10n Batch Prepared Analyzed Method Notes <br /> MW-13(P409117-04)Water Sampled 09/07/04 05 29 Received 09/07/0416 55 <br /> Surrogate Toluene-d8 97% 84-119 4090417 09/16/04 09117/04 EPR 8260B <br /> Surrogate 4-Bromofluorobenzene 108% 86-119 " <br /> MW-15(P409117-05)Water Sampled 09/07/04 05 41 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 1000 ug/l 1004 4090417 09/16/04 09/17/04 EPA 8260B <br /> Benzene 12000 500 " <br /> Tert-butyl alcohol ND 20000 <br /> Di-isopropyl ether ND 1000 <br /> 1,2-Dibromoethane(EDB) ND 500 <br /> 1,2-Dichloroethane ND 500 <br /> Ethanol ND 100000 <br /> Ethylbenzene 3400 500 <br /> Ethyl tert-butyl ether ND 1000 <br /> Methyl tert-butyl ether ND 500 <br /> Oene 28000 500 " <br /> nes(total) 21000 500 <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> Surrogate 12-Dichloroethane-d4 97% 74-135 <br /> Surrogate Toluene-d8 97% 84-119 <br /> Surrogate 4-Bromofluorobenzene 106% 86-119 <br /> VW-1 (P409117-06)Water Sampled 09/07/04 04 30 Received 09/07/04 16 55 <br /> Tert-amyl methyl ether ND 1000 ug/1 1000 4090417 09/16/04 09/17/04 EPA 8260B <br /> Benzene 32000 500 <br /> Tert-butyl alcohol ND 20000 <br /> Di-isopropyl ether ND 1000 <br /> 1,2-Dibromoethane(EDB) ND 500 <br /> 1,2-Dichloroethane ND 506 <br /> Ethanol ND 100000 " <br /> Ethylbenzene 890 500 " <br /> Ethyl tert-butyl ether ND 1000 <br /> Methyl tert-butyl ether 620 500 <br /> Toluene 23000 500 <br /> Xylenes(total) 13000 500 <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 98% 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 " IF " <br /> Surrogate 4-Bromofluorobenzene 107% 86-119 11 <br /> uola Analytical-Petaluma 1 he 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 7 of 15 <br />