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]455 McDow <br /> Sequoia Petaluma,CA 94954ell Blvd, North Ste 4 <br /> (707)792 1865 <br /> 1W Analytical FAX(707)792 0342 <br /> www sequotalabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P311302 <br /> 3017 Ktlgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/01/03 15 25 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B1$021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte. Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF(P311302-01)Air Sampled 11/13/0314 10 Received 11/13/0315 30 <br /> Gasoline Range Organics 4400 500 mg/ml Air 10 3110312 11/14/03 11/14/03 EPA <br /> 80 1513/802 1 B <br /> Benzene ND 5 0 " <br /> Toluene 160 5 0 " <br /> Ethylbenzene 150 5 0 " <br /> Xylenes(total) 860 5 0 " <br /> Methyl tert-butyl ether ND 20 " <br /> Surrogate a,a,a-Trifluorotoluene 99% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 <br /> Gasoline Range Organics 1200 140 ppmv 10 " <br /> Benzene ND 16 " <br /> Toluene 44 13 " <br /> •Ethylbenzene 35 12 <br /> Xylenes(total) 200 12 " <br /> Methyl cert-butyl ether ND 5 6 " <br /> Surrogate a aa-Trifluorotoluene 99% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> AS-EFF(P311302-02)Air Sampled 11/13/03 14 05 Received 11/13/03 15 30 <br /> Gasoline Range Organics 21 10 mg/tn'Air 0 2 3110312 11/14/03 11/14/03 EPA <br /> 6015B/8021B <br /> Benzene 16 010 " <br /> Toluene 21 010 <br /> Ethylbenzene 046 010 " <br /> Xylenes(total) 16 010 " <br /> Methyl tert-butyl ether 17 040 <br /> Surrogate a aa-Triuorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 94% 6S-135 " <br /> Gasoline Range Organics 60 28 ppmv 02 " <br /> Benzene 052 0 032 " <br /> Toluene 055 0 026 " <br /> Ethylbenzene Oil 0 024 " <br /> Xylenes(total) 036 0 024 " <br /> Methyl tert-butyl ether 48 Oil " <br /> Surrogate a,a a-Trifluorotoluene 100% 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 15 <br />