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985 Jarvis Dm¢ <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> a— )W Analytical FAX(406)782-6308 <br /> www sequoialabscom <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MMd0614 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/04/03 16 52 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Lurut Units Drtution Batch Prepared Analyzed Method Notes <br /> MW4(MMJ0614-03)Water Sampled 10/17/03 11 40 Received 10/20/03 18 40 <br /> Tert-amyl methyl ether ND 250 ug/1 250 3100778 10/30/03 10/30/03 EPA 8260B <br /> Tert-butyl alcohol ND 5000 <br /> Di-isopropyl ether ND 250 <br /> 1,2-Dibromoethane(EDB) ND 120 " <br /> 1,2-Dichloroetharie 170 120 " <br /> Ethanol ND 25000 " <br /> Ethyl tert-butyl ether ND 250 <br /> Methyl tert-butyl ether 7200 120 <br /> Surrogate Dibromofluoromethane 110% 84-111 <br /> Surrogate 1,2-Dichloroethane-d4 124% 74-135 <br /> Surrogate Toluene-d8 97% 84-119 " <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wee weight basis <br /> This analytical report must be reproduced in its entirety 0 <br /> 5of10 <br />