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1455 McDowell a— ) (707) <br /> Pd North Ste <br /> SequoiaPetaluma CA 949544 <br /> 4 <br /> 792 1865 <br /> OqwAnalytical FAX(707) 7920342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P312141 <br /> 3017 Kilgare Road Suite 100 Project Number [none] Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/22/03 14 28 <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 /> AS EFF(P312141-04)Water Sampled 12/03/03 14 15 Received 12/03/03 15 40 <br /> Benzene ND 050 ug/l 1 3120474 12/16/03 12/16/03 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Methyl tent-butyl ether 42 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 115% 84-122 " <br /> Surrogate 1 2-Drchloroethane-d4 107% 74-135 " <br /> Surrogate Toluene-d8 116% 84-119 " <br /> EFF(P312141-05)Water Sampled 12/03/03 14 00 Received 12/03/03 15 40 -_ <br /> Benzene ND 050 ug/1 1 3120474 12/16/03 12/16/03 EPA 82606 <br /> Ethylbenzene ND 050 " " <br /> W ethyl <br /> tert-butyl ether ND 050 <br /> luene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromojluoromethane 114% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 110% 74-135 " <br /> Surrogate Toluene-d8 116% 84-119 " <br /> quota 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 entirely <br /> Page 7 of 16 <br />