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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94454 <br /> (D (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342342 <br /> www sequoialabs colp <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P401156 <br /> 3017 Kllgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/27/04 15 26 <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 /> INF(P401156-01)Air Sampled 01/12/0412 40 Received 01/13/04 08 05 <br /> Gasoline Range Organics 100 10 mg/ml Air 02 4010178 01/13/04 01/13/04 EPA <br /> 8015B/8021B <br /> Benzene ND 010 " <br /> Toluene 21 010 QR-04 <br /> Ethylbenzene 074 010 " <br /> Xylenes(total) 8 8 010 " <br /> Methyl tert-butyl ether 17 040 " <br /> Surrogate a a,a-Tr fluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 " <br /> Gasoline Range Organics 29 2 8 ppmv 0 2 <br /> Benzene ND 0 032 <br /> Toluene 055 0 026 1 QR 04 <br /> Ethylbenzene 017 0 024 <br /> Xylenes(total) 2 0 0 024 <br /> Methyl tert-butyl ether 4 8 Oil " <br /> Surrogate a,a,a-Tnfluorotoluene 99% 65-135 <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 " <br /> EFF(P401156-02)Air Sampled 01/12/04 12 30 Received 01/13/04 08 05 <br /> Gasoline Range Organics ND 10 mg/m'Air 0 2 4010178 01/13/04 01/13/04 EPA <br /> 8015B/802IB <br /> Benzene ND 010 " <br /> Toluene ND 010 " <br /> Ethylbenzene ND 010 " <br /> Xylenes(total) 050 0 10 " <br /> Methyl tert-butyl ether ND 040 " <br /> Surrogate a a a-Tnfluorotoluene 98% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> Gasoline Range Organics ND 2 8 ppmv 0 2 " <br /> Benzene ND 0 032 " <br /> Toluene ND 0 026 " <br /> Ethylbenzene ND 0 024 <br /> Xylenes(total) 0 12 0 024 " <br /> Methyl tert-butyl ether ND 0 11 " <br /> Surrogate a a a-Tnfluorotoluene 98% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ojcusiody 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 16 <br />