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Sequoia 1455AtcUowellBhd CA 94954 <br /> `'���'� Petaluma CA 94954 <br /> Analytical (707)792 <br /> 1865 <br /> FAX(70 7)792 0342342 <br /> qW <br /> www sequoialabs co <br /> is <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P310580 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95674 Project Manager Rusty Benkosky 11/06/03 18 54 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> A S (P310580-03)Air Sampled 10/23/03 11 10 Received 10/23/03 14 30 HT-09 <br /> Benzene 43 10 mg/m'Air 20 3110076 11/05/03 11/05103 EPA 8260B <br /> Ethylbenzene 12 10 <br /> Methyl tert-butyl ether 180 10 " <br /> Toluene 46 t0 " <br /> Xylenes(total) 50 10 " <br /> Surrogate Dibromofluoromethane 106% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 111 % 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 " <br /> Benzene 14 3 2 ppmv 20 " <br /> Ethylbenzene 27 24 <br /> Methyl tert-butyl ether 49 28 " <br /> Toluene 12 26 " <br /> Xylenes(total) 12 24 <br /> Surrogate Dibromofluoromethane 106% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 III% 74-135 " <br /> Surrogate Toluene-d8 98% 84-119 <br /> Eff(P310580-04)Water Sampled 10/23/0312 40 Received 10/23/03 14 30 <br /> Benzene ND 050 ug/1 1 3110024 11/03/03 11/03/03 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 111 % 84-122 <br /> Surrogate 12-Dichloroethane-d4 113% 74-135 <br /> Surrogate Toluene-d8 91% 84-119 <br /> Sequoia Analytical-Petaluma The results to 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 6 of 19 <br />