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a— ) <br /> Sequoia 1455 McDowell Blvd,North Ste 4 Petaluma, CA 9g9gqW Analytical (707)792-1342 <br /> y FAX(707)792-0342 <br /> www sequoiala6s co <br /> � � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P402158 <br /> 3017 Ktlgare 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 8015BI8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Artaiyzed Method Notes <br /> INF(P402158-01)Air Sampled 02/04/0410 10 Received 02/04/04 14 55 A-01 <br /> Gasoline Range Organics 1900 100 mg/m'Air 2 4020144 02/06/04 02/06/04 EPA <br /> 8015BI9021B <br /> Benzene ND 10 " <br /> Toluene 59 10 " <br /> Ethylbenzene 61 1 0 " <br /> Xylenes(total) 260 1 0 " <br /> Methyl tert-butyl ether ND 4 0 <br /> Surrogate a,a,a-Trfluorotoluene 95% 65-135 <br /> Surrogate 4-Bromofluorobenzene 107916 65-135 " <br /> Gasoline Range Organics 530 28 ppmv 2 <br /> Benzene ND 032 ^ " <br /> Toluene 16 026 ^ " <br /> Ethylbenzene 14 024 <br /> Xylenes(total) 61 024 ^ <br /> Methyl tert-butyl ether ND 1 1 " <br /> Surrogate a,a,a-Trfluorotoluene 95% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 107% 65-135 " <br /> AS EFF(P401158-02)Air Sampled 02/04/0410 05 Received 02/04/0414 55 <br /> Gasoline Range Organics 39 10 mg/m3 Air 0 2 4020143 02/06/04 02/06/04 EPA <br /> 8015B/8021B <br /> Benzene 075 010 " <br /> Toluene 16 010 <br /> Ethylbenzene ND 010 ^ " <br /> Xylenes(total) 16 010 <br /> Methyl tert-butyl ether 88 040 " <br /> Surrogate a a a-Trfluorotoluene 110% 65-135 " <br /> Surrogate 4-BromoJluorobenzene 102% 65-135 " <br /> Gasoline Range Organics 11 28 ppmv 02 " <br /> Benzene 024 0 032 " <br /> Toluene 042 0 026 " <br /> Ethylbenzene ND 0 024 " <br /> Xylenes(total) 036 0 024 " <br /> Methyl tert-butyl ether 24 Oil " <br /> Surrogate a,a a-Trfluorotoluene 109% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 102% 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 0 <br /> Page 4 of 18 <br />