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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(747)792-0342 <br /> www sequotalabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P307150 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/23/03 16 39 <br /> Total Petroleum Hydrocarbons as Gasoline 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(P307150-01)Air Sampled 07/08/03 12 10 Received 07/08/03 16 30 <br /> Gasoline Range Organics 60000 5000 mg/ml Air 100 3070137 07/10/03 07/10/03 EPA <br /> 8015B/8021B <br /> Benzene 620 50 QR-04 <br /> Toluene 2500 50 " <br /> Ethylbenzene 290 50 " <br /> Xylenes(total) 1100 50 " <br /> Methyl tert-butyl ether 15000 200 " <br /> Surrogate a a a-Trifluorotoluene 102% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 " <br /> Gasoline Range Organics 17000 1400 ppmv 100 " <br /> Benzene 200 16 QR-04 <br /> Toluene 660 13 " <br /> thylbenzene 67 12 " <br /> ylenes(total) 240 12 " <br /> Methyl tent-butyl ether 4200 56 " <br /> Surrogate a,a,a-Tnfluorotoluene 102% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 " <br /> EFF(P307150-02)Air Sampled 07/08/0312 00 Received 07/08/03 16 30 <br /> Gasoline Range Organics 16 10 mg/ml Air 02 3070137 07/10/03 07/10/03 EPA <br /> 8015B/8021B <br /> Benzene 025 010 " <br /> Toluene 056 010 " It " " It I. <br /> Ethylbenzene ND 010 It <br /> " " <br /> Xylenes(total) 024 010 It " <br /> Methyl tert-butyl ether 082 040 <br /> Surrogate a,a,a-Tnfluorotoluene 100% 65-135 " <br /> Surrogate 4-BromoJluorobenzene 101% 65-135 " <br /> Gasoline Range Organics 45 2 8 ppmv 0 2 " <br /> Benzene 0 080 0 032 " 11 " <br /> Toluene 015 0 026 " <br /> Ethylbenzene ND 0 024 <br /> Xylenes(total) 0 056 0 024 <br /> Methyl tert-butyl ether 023 Oil " <br /> Surrogate a a a-Triuorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 102% 65-135 " <br /> �tquola 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 16 <br />