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rj'1 Sequoia 1455 McDowell Blvd North Ste <br /> �� Petaluma,CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792 4342 <br /> www sequoialabs coo <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P401156 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/27/04 15 26 <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 /> INF(P401156-04)Water Sampled 01/12/04 13 20 Received 01/13/04 08 05 <br /> Benzene 260 250 ug/1 500 4010246 01/15/04 01/15/04 EPA 8260B <br /> Ethylbenzene ND 250 <br /> Methyl tert-butyl ether 21000 250 <br /> Toluene 610 250 " <br /> Xylenes(total) 570 254 " <br /> Surrogate Dibromofluoromethane 101% 84-112 " <br /> Surrogate 12-Dichloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 <br /> MID-1(P401156-05)Water Sampled 01/12/04 13 10 Received 01/13/04 08 05 <br /> Benzene ND 050 uo 1 4010246 01/15/04 01/15/04 EPA 8260B <br /> Ethylbenzene ND 050 <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 101% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 104% 74-135 " <br /> Surrogate Toluene-d8 100% 84-119 " <br /> MID-2(P401156-06)Water Sampled 01/12/04 13 05 Received 01/13/04 08 05 <br /> Benzene ND 050 ug/l 1 4010246 01/15/04 01/15/04 EPA 82608 <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 98% 84-121 " <br /> Surrogate 1 2-Dichloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 102% 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 0 <br /> Page 6 of 16 <br />