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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> D— (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www scquoialabs coin <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P307150 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/23/03 16 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> [A-alytc Result Limit Units Dduthon Batch Prepared Analyzed Method Notes <br /> ASEFF(P307150-07)Water Sampled 07/08/03 12 35 Received 07/08/03 16 30 <br /> Benzene ND 10 ug/1 2 3070389 07/18/03 07/19/03 EPA 8260E <br /> Ethylbenzene ND 10 " <br /> Methyl tert-butyl ether 45 10 " <br /> Toluene 2 5 10 " <br /> Xylenes(total) 37 10 " <br /> Surrogate Dtbromofluoromethane 104% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 102% 74-135 " <br /> Surrogate Toluene-d8 108% 84-119 " <br /> GW-EFF(P307150-08)Water Sampled 07/08/03 12 30 Received 07/08/03 16 30 <br /> Benzene ND 050 ug/1 1 3070395 07/19/03 07/19/03 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> ethyl tert-butyl ether 1 1 050 <br /> " <br /> qwluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromonuoromethane 105% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 107% 74-135 <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Oquota Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 7 of 16 <br />