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DSequoia 1455 McDowell Blvd North Ste <br /> — (707)Petaluma GA 949544 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 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/20/04 12 06 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> EFF(P402158-03)Air Sampled 02/04/04 10 00 Received 02/04/04 14 55 <br /> Gasoline Range Organics ND 10 mg/ml Air 02 4020144 02/06/04 02/06/04 EPA <br /> 8015B/8021B <br /> Benzene ND 010 " <br /> Toluene ND 010 <br /> Ethylbenzene ND 010 <br /> Xylenes(total) ND 0 10 " ^ <br /> Methyl tert-butyl ether ND 040 " ^ <br /> Surrogate a a a-Triuorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 101% 65-135 <br /> Gasoline Range Organics ND 2 8 ppmv 0 2 " <br /> Benzene ND 0 032 " <br /> Toluene ND 0 026 ^ <br /> sEthylbenzene ND 0 024 <br /> Xylenes(total) ND 0 024 <br /> Methyl tert-butyl ether ND 0 11 <br /> Surrogate a,a,a-Trifluorotoluene 100% 65-135 ^ <br /> Surrogate 4-Bromofluorobenzene 101% 65-135 <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 5of18 <br />