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1455 McDowell Blvd North Ste D <br /> a— ) Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> �► Analytical FAX(707)792-0342 <br /> www se9uosalabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P503196 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/25/05 17 38 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notc <br /> MW-10(P503196-03)Water Sampled 03/15/05 06 44 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 100 ug/l 100 5030210 03/21/05 03/21/05 EPA 8260B <br /> Benzene 3700 50 " <br /> Tert-butyl alcohol ND 2000 <br /> Dr-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene 270 50 " <br /> Ethyl tert-butyl ether ND 100 " <br /> Methyl tert-butyl ether ND 50 " <br /> Toluene 3200 50 <br /> Xylenes(total) 6500 50 <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> rrogate 1,2-Dichloroethane-d4 94% 74-135 <br /> rrogate Toluene-d8 98% 84-119 <br /> Surrogate 4-Bromofluorobenzene 101 % 86-119 <br /> MW-12(P503196-04)Water Sampled 03/15/05 06 57 Received 03/15/05 12 30 <br /> Tert-amyl methyl ether ND 500 ug/l 500 5030223 03/22/05 03/22/05 EPA 8260B <br /> Benzene 9600 250 " <br /> Tert-butyl alcohol ND 10000 " <br /> Di-isopropyl ether ND 500 " <br /> 1,2-Dibromoethane(EDB) ND 250 " <br /> 1,2-Dichloroethane ND 250 " <br /> Ethanol ND 50000 " <br /> Ethylbenzene 1500 250 " <br /> Ethyl tert-butyl ether ND 500 " <br /> Methyl tert-butyl ether ND 250 " <br /> Toluene 16000 250 " <br /> Xylenes(total) 11000 250 " <br /> Surrogate Dibromofluoromethane 97°/n 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 96% 74-135 <br /> Surrogate Toluene-d8 95% 84-119 <br /> Surrogate 4-Bromofluorobenzene 102% 86-119 <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 staled results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 18 <br />