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eD <br /> Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 94954 <br /> Analytical (707)792 0865 <br /> FAX equoi 792 0342 <br /> corn www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P401156 <br /> 3017 Mgare Road Suite 100 Project Humber 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/27/04 15 26 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> AS-EFF(P401156-03)Air Sampled 01/12/0412 35 Received 01/13/04 08 05 <br /> Gasoline Range Organics 30 10 mg/m'Air 02 4010178 01/13/04 01/13/04 EPA <br /> 8015B/802I B <br /> Benzene 036 0 10 <br /> Toluene 057 0 10 <br /> Ethylbenzene ND 0 10 " <br /> Xylenes(total) 12 0 10 <br /> i <br /> Methyl tert-butyl ether 42 040 <br /> i <br /> Surrogate a a a-Tri luorololuene 101 % 65-135 " <br /> Surrogate 4-Bromofluorobenzene 98% 65-135 " <br /> Gasoline Range Organics 8 5 2 8 ppmv 0 2 <br /> Benzene Oil 0 032 " <br /> Toluene 015 0 026 <br /> �Ethylbenzene ND 0 024 <br /> )Xylenes(total) 029 0 024 <br /> Methyl tert-butyl ether 12 Oil <br /> Surrogate a a a-Trifluorotoluene 101 % 65-135 " <br /> Surrogate 4-Bromofluorobenzene 98% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> • <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 5 of 16 <br />