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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma, CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> •' www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Kilgare Road Suite 100 Pr4lect Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Anaiyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> AS EFF(P402158-07)Water Sampled 02/04/04 10 45 Received 02/04/0414 55 <br /> Benzene ND 10 ug/l 20 4020278 02/11/04 02/12/04 EPA 8260E <br /> Ethylbenzene ND 10 " <br /> Methyl tert-butyl ether 490 10 " <br /> Toluene ND 10 <br /> Xylenes(total) 38 10 <br /> Surrogate Dibromofluoromethane 101 % 84-122 <br /> Surrogate 12-Dtchloroethane-d4 94% 74-135 <br /> Surrogate Toluene-d8 85% 84-119 <br /> EFF(P402158-08)Water Sampled 02/04/0410 30 Received 02/04/0414 55 <br /> Benzene ND 050 ug/l l 4020278 02/11/04 02/12/04 EPA 8260E <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 <br /> Surrogate Dibromofluoromethane 100% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 102% 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 <br /> Page 7 of 18 <br />