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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 P406323 <br /> 3017 Rilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/07/04 16 39 <br /> BTEX by 8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> AS-EFF(P406323-03)Air Sampled 06/14/04 15 50 Received 06/15/04 07 55 <br /> Benzene 19 010 mg/m'Air 0 2 4060372 06/16/04 06/16/04 EPA 8021B <br /> Toluene 20 010 <br /> Ethylbenzene 082 010 <br /> Xylenes(total) 49 010 <br /> Methyl tert-butyl ether 53 050 " <br /> Surrogate a a a-Triuorotoluene 100% 65-135 " <br /> Benzene 060 0 032 ppmv 0 2 " <br /> Toluene 054 0 026 <br /> Ethylbenzene 0 19 0 024 " <br /> Xylenes(total) 11 0 024 " <br /> Methyl tert-butyl ether 15 Oil " <br /> . Surrogate a,a,a-Trifluarotoluene 100% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported an a wet <br /> weight basis This analytical report must be reproduced in its entirety <br /> Page 5 of 10 <br />