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1455 McDowell Blvd,North Ste 1) <br /> Sequoia Petaluma CA 94954 <br /> a— ) <br /> W Analytical FAX(747)792-1865 <br /> (707)792-0342 <br /> www sequoialabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/19/04 15 02 <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(P403078-04)Water Sampled 03/03/04 12 35 Received 03/04/04 08 55 <br /> Benzene 130 50 ugll 100 4030376 03/15/04 03/15/04 EPA 8260E <br /> Etbylbenzene 64 50 " <br /> Toluene 350 50 <br /> Xylenes(total) 550 50 " <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 117% 74-135 " <br /> Surrogate Toluene-d8 93% 84-119 " <br /> INF(P403078-04REl)Water Sampled 03/03/0412 35 Received 03/04/04 08 55 <br /> Methyl tert-butyl ether 14000 250 ug/l 500 4030416 03/15/04 03/16/04 EPA 8260B <br /> Surrogate Dibromofluoromethane 104% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 III% 74-135 " <br /> Surrogate Toluene-d8 87% 84-119 " <br /> MID-1 (P403078-05)Water Sampled 03/03/04 12 25 Received 03/04/04 08 55 • <br /> Benzene ND 050 ug/1 1 4030376 03/15/04 03/15/04 EPA 8264E <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 114% 74-135 " <br /> Surrogate Toluene-d8 90% 84-119 " <br /> MID-2(P403078-06)Water Sampled 03/03/0412 20 Received 03/04/04 08 55 <br /> Benzene ND 0 50 ug/1 1 4030376 03/15/04 03/15/04 EPA 8260B <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 108% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 114% 74-135 <br /> Surrogate Toluene-d8 93% 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 23 <br />