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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 865 <br /> 9.0�0 Analytical <br /> (707)792 342 <br /> FAX equot lab 0342 <br /> www sequotalabs coin <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P407278 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/11/04 09 51 <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 /> INF(P407278-05)Water Sampled 07/13/04 15 10 Received 07/14/04 08 56 <br /> Benzene ND 500 ug/1 1000 4070538 07/27/04 07/27/04 EPA 82608 <br /> Ethylbenzene ND 500 " <br /> Methyl tert-butyl ether 5200 500 " <br /> Toluene ND 500 " <br /> Xylenes(total) ND 500 " <br /> Surrogate Dtbromofluoromethane 120% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 III% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 <br /> MID-1(P407278-06)Water Sampled 07/13/04 15 00 Received 07/14/04 08 56 <br /> Benzene ND 050 ugli 1 4070538 07/27/04 07/27/04 EPA 8260E <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 118% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 114% 74-135 " <br /> Surrogate Toluene-d8 110% 84-119 <br /> MID-2(P407278-07)Water Sampled 07/13/04 14 55 Received 07/14/04 08 56 <br /> Benzene ND 050 ug/1 1 4070538 07/27/04 07/27/04 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 116% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 118% 74-135 " <br /> Surrogate Toluene-d8 112% 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 7 of 17 <br />