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1455 McDowell Blvd North Ste 1) <br /> Sequoia Petaluma,CA 954 <br /> ,Z_ 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoia[abs coni <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton, CA P405538 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/0417 02 <br /> BTEX by 8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF(P405538-01)Air Sampled 05/25/04 12 15 Received 05/26/04 08 00 <br /> Benzene ND 025 mg/m'Air 05 4050700 05/28/04 05/28/04 EPA 8021B <br /> Toluene 2 5 025 " <br /> Ethylbenzene 5 5 025 " <br /> Xylenes(total) 34 025 <br /> Methyl tert-butyl ether ND 12 " <br /> Surrogate a a a-Trifluorotoluene 94% 65-135 " <br /> Benzene ND 0 080 ppmv 05 " <br /> Toluene 067 0 065 " <br /> Ethylbenzene 13 0 060 " <br /> Xylenes(total) 7 7 0 060 " <br /> Methyl tert-butyl ether ND 028 " <br /> Surrogate aa a-Tri luorotoluene 94% 65-135 " <br /> EFF(P405538-02)Air Sampled 05/25/0412 10 Received 05/26/04 08 00 <br /> Benzene ND 010 mg/ml Aa 02 4050700 05128/04 05/28/04 EPA 8021B <br /> Toluene ND 010 <br /> Ethylbenzene ND 010 " <br /> Xylenes(total) ND 010 " <br /> Methyl cert-butyl ether ND 050 " <br /> Surrogate a aa-Trifluorotoluene 102% 65-135 " <br /> Benzene ND 0 032 ppmv 02 ^ <br /> Toluene ND 0 026 <br /> Ethylbenzene ND 0 024 <br /> Xylencs(total) ND 0 024 " <br /> Methyl tert-butyl ether ND 011 <br /> Surrogate a a a-TrIfluorotoluene 102% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report ripply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety 0 <br /> Page 4 of 8 <br />