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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707"92 1865 <br /> wwwequoi 792 0342 <br /> www sequoialahs com <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 <br /> Prepared Analyzed Method Notes <br /> AS-EFF(P403078-07)Water Sampled 03/03/04 12 30 Received 03/04/04 08 55 <br /> Benzene 071 050 ug/I 1 4030378 03/15/04 03/15/04 EPA 8260E <br /> Ethylbenzene 48 0 50 <br /> Toluene 3 8 050 " <br /> Xylenes(total) 48 050 " ^ <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 95% 74-135 <br /> Surrogate Toluene-d8 98% 84-119 <br /> AS-EFF(P403078-07RE1)Water Sampled 03/03/04 12 30 Received 03/04/04 08 55 <br /> Methyl tert-butyl ether 380 5 0 ugA 10 4030422 03/16/04 03/16/04 EPA 8260B <br /> Surrogate Dibromofluoromethane 106% 84-122 ^ " <br /> Surrogate 12-Dichloroethane-d4 113% 74-135 " ^ <br /> •Surrogate Toluene-d8 86% 84-119 <br /> EFF(P403078-08)Water Sampled 03/03/04 12 15 Received 03/04/04 08 55 <br /> Benzene ND 0 50 ug/I 1 4030378 03/15/04 03/15/04 EPA 8260B <br /> Ethylbenzene ND 0 50 " ^ <br /> Methyl tert-butyl ether ND 0 50 " ^ <br /> Toluene ND 050 ^ ^ ^ <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 89% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 88% 74-135 <br /> Surrogate Toluene-d8 98% 84-119 ^ <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • <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 23 <br />