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lvd, North <br /> Sequoia 1455 McDowPealuma CA 941954 <br /> 4D (707)792-1865 <br /> AnalycaFAX <br /> tical (707)792-0342342 <br /> www sequoualabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311302 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported: <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <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 /> GW-INF(P311302-04)Water Sampled 11/13/03 14 40 Received 11/13/03 15 30 <br /> Benzene 980 250 ug/l 500 3110489 11/21/03 11/21/03 EPA 8260B <br /> Ethylbenzene 390 250 " <br /> Methyl tert-butyl ether 12000 250 " <br /> Toluene 1600 250 " <br /> Xylenes(total) 1800 250 " <br /> Surrogate Dibromofluoromethane 111% 84-111 " <br /> Surrogate 1,1-Dichloroethane-d4 112% 74-135 " <br /> Surrogate Toluene-d8 118% 84-119 " <br /> AS EFF(P311302-05)Water Sampled 11/13/03 14 35 Received 11/13/03 15 30 <br /> Benzene ND 0 50 ugtl 1 3110489 11/21/03 11/21/03 EPA 8260B <br /> Ethylbenzene ND 0 50 " <br /> . Methyl tert-butyl ether 1 1 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) 12 050 " <br /> Surrogate Dibromofluoromethane 111% 84-122 " <br /> Surrogate 1,1-Dichloroethane-d4 116% 74-135 " <br /> Surrogate Toluene-d8 119% 84-119 " <br /> MID 1(P311302-06)Water Sampled 11/13/03 14 30 Received 11/13/03 15 30 <br /> Benzene ND 050 ugtl 1 3110489 11/21/03 11/21/03 EPA 8260B <br /> Ethylbenzene ND 0 50 " It " " " " <br /> Methyl tort-butyl ether ND 050 It <br /> Toluene ND 050 It ^ " <br /> Xylenes(total) ND 050 It <br /> Surrogate Dibromofluoromethane 114% 84-122 " <br /> Surrogate 1,2-Dichloroethane-0 119% 74-135 " <br /> Surrogate Toluene-d8 118% 84-119 " <br /> Sequoia 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 6 of 15 <br />