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1455 McDowell Blvd,North Ste <br /> Sequoia Petaluma,CA 449544 <br /> (707)792 1865 <br /> a— ) <br /> Analytical wFAX ww s(707)792 0342 <br /> scom <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406323 <br /> 3017 Kilgare Road Suite 100 ProjectNumber 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 /> INF(P406323-01)Air Sampled 06/14/04 15 55 Received 06/15/04 07 55 <br /> Benzene 25 25 mg/ml Air 5 4060372 06/16/04 06/16/04 EPA 8021 B <br /> Toluene 68 25 " <br /> Ethylbenzene 86 25 " <br /> Xylenes(total) 79 25 " <br /> Methyl tert-butyl ether 660 12 " <br /> Surrogate a,a,a-Tnfluorotoluene 102% 65-135 " <br /> Benzene ND 080 Ppmv 5 " <br /> Toluene 18 065 " <br /> Ethylbenzene 20 060 " <br /> Xylenes(total) 18 060 " <br /> Methyl tert-butyl ether 180 28 " <br /> Surrogate a a a-Trifluorotoluene 102% 65-135 " <br /> EFF(P406323-02)Air Sampled 06/14/04 15 45 Received 06/15/04 07 55 <br /> Benzene ND 010 mg/m'Air 0 2 4060372 06/16/04 06/16/04 EPA 8021B <br /> Toluene ND 010 " <br /> Ethylbenzene ND 010 " <br /> Xylenes(total) ND 010 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate a,a a-Tnfluorotoluene 102% 65-135 " <br /> Benzene ND 0032 ppmv 02 " <br /> Toluene ND 0 026 " <br /> Ethylbenzene ND 0 024 <br /> Xylenes(total) ND 0 024 " <br /> Methyi cert-butyl ether ND 0 1 i " <br /> Surrogate a a a-71rtfluorotoluene 102% 65-135 " <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed in accordance with the <br /> ckain of custody document Unless otherwise stated results are reported on a wet <br /> weight basis This analytical report must be reproduced in its entirety 0 <br /> Page 4 of 10 <br />