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Z— (701455 McDowell Blvd,North Ste D <br /> 7) <br /> Sequora Petaluma CA 94954 <br /> Analytical 792-1855 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403223 <br /> 3017 K119are Road Suite 100 Project Number [none] Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/25/04 16 45 <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 /> AS-EFF(P403223-03)Air Sampled 03/10/04 07 00 Received 03/10/04 09 25 <br /> Gasoline Range Organics(C6-C10) 78 25 mg/ml Air 05 4030287 03/11/04 03/11/04 EPA <br /> 8015B/8021B <br /> Benzene 090 025 <br /> Toluene 1 3 025 ~ ~ <br /> Ethylbenzene ND 025 <br /> Xylenes(total) 22 025 <br /> Methyl tert-butyl ether 96 10 <br /> Surrogate a a a-Trfluorotoluene 99% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 93% 65-135 " <br /> Gasoline Range Organics(C6-C10) 22 71 ppmv 05 " <br /> Benzene 028 0 080 <br /> Toluene 035 0 065 <br /> .Ethylbenzene ND 0 060 <br /> Xylenes(total) 050 0 060 " <br /> Methyl tert-butyl ether 27 028 <br /> Surrogate a a a-Trifluorotoluene 99% 65-135 ~ <br /> Surrogate 4-Bromofluorobenzene 94% 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 4 of 7 <br />