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rive <br /> a— ) 885l CA 8Sequoia MorganHill CA950370377 <br /> (4D$)782 9600 <br /> Analytical <br /> FAX(408 782 6308 <br /> www sequoialabs cam <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/28/04 16 50 <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 /> MW-3(MNA0375-03)Water Sampled 01/13/04 10 20 Received 01/14/04 10 40 <br /> Tert-amyl methyl ether ND 10 ug/l 1 4010389 41/21/04 01/21/04 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether 0 79 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 110% 84-122 " <br /> Surrogate 1 2-Dichloroethane-d4 105% 74-135 <br /> Surrogate Toluene-d8 91% 84-119 <br /> Surrogate 4-Bromofluorobenzene 94% 86-119 " <br /> MW4(MNA0375-04)Water Sampled 01/13/0416 10 Received 01/14/0410 40 <br /> Tert-amyl methyl ether ND 50 ugll 50 4010389 01/21/04 01/21/04 EPA 8260B <br /> Benzene 220 25 <br /> Tert-butyl alcohol ND 1000 " <br /> Di-isopropyl ether ND 50 <br /> 1,2-Dibromoethane(EDB) ND 25 <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 5000 " <br /> Ethylbenzene 110 25 <br /> Ethyl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether 33 25 " <br /> Toluene 550 25 <br /> Xylenes(total) 460 25 " <br /> Surrogate Dibromofluoromethane 105% 84-122 " <br /> Surrogate 1,2-Dichloroethane-d4 100% 74-135 <br /> Surrogate Toluene-d8 92% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 95% 86-119 " <br /> Sequoia Analytical-Morgan Hill 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 <br /> Page 7 of 30 <br />