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i <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1865 <br /> iW Analytical FAX(707)792 0342 <br /> www sequoialabs cum <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P407278 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/11/04 09 51 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Llmts Dilution Batch Prepared Analyzed Method Note <br /> AS EFF(P407278-08)Water Sampled 07/13/04 15 05 Received 07/14/04 08 56 <br /> Benzene ND 050 ug/l 1 4070538 07/27/04 07/27/04 EPA 826013 <br /> Ethylbenzene ND 050 ^ " <br /> Methyl tert-butyl ether 58 050 " E <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 117% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 115% 74-135 " <br /> Surrogate Toluene-d8 112% 84-119 " <br /> AS EFF(P407278-08RE1)Water Sampled 07/13/04 15 05 Received 07/14/04 08 56 HT-RA <br /> Methyl tent-butyl ether 44 2 5 ug/1 5 4070610 07/29/04 07/29/04 EPA 8260E <br /> Surrogate Dibromofluoromethane 98% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 105% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 <br /> EFF(P407278-09)Water Sampled 07/13/04 14 50 Received 07/14/04 08 56 <br /> Benzene ND 0 50 ugll 1 4070538 07/27/04 07/27/04 EPA 8260B <br /> Ethyibenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " ^ <br /> Surrogate Dibromofluoromethane 118% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 116% 74-135 " <br /> Surrogate Toluene-d8 114% 84-119 " <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reporled on a wet weight basis <br /> This analytical report must be reproduced in its entirety 0 <br /> Page 8 of 17 <br />