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YL 1 <br /> ' 1455 McDowcll Blvd North Sir D <br /> Sequoia Pctaluma CA 94954 <br /> Z— (707)792 1665 <br /> Analytical FAX(707)792 0342 <br /> www scquoialabs corn <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P305591 <br /> 3017 Ugare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/05/03 16 20 <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 ]Votes <br /> INFSP305591-00 Air Sampled 05/29/03 10 15 Received 05/29/03 12 50 <br /> Gasoline Range Organics 48000 5000 mg/ml Air 100 3050782 05/31/03 05/31/03 EPA <br /> 8015BI8021B <br /> Benzene 520 50 <br /> Toluene 2100 50 <br /> Ethylbenzene 210 50 " <br /> Xylenes(total) 840 50 " <br /> Methyl tert-butyl ether 5500 200 B <br /> Surrogate a a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 98% 65-135 " <br /> Gasoline Range Organics 14000 1400 ppmv 100 " <br /> Benzene 160 16 " <br /> Toluene 550 13 " <br /> tbylbenzene 48 12 1 <br /> Xylenes(total) 190 12 <br /> Methyl tent-butyl ether 1500 56 B <br /> Surrogate a a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 98% 65-135 " <br /> IM W305591-01RED Air Sampled 05/29/03 10.15i )Received.05/29103 12 50 A-01,HT-04 <br /> Gasoline Range Organics 56000 5000 mg/m'Air 100 3050782 06/01/03 06/01/03 EPA <br /> 8015B/8021B <br /> Benzene $90 50 " <br /> Toluene 2300 50 " <br /> Ethylbenzene 240 50 <br /> Xylenes(total) 990 50 " <br /> Methyl tent-butyl ether 7600 200 <br /> Surrogate a a a-Trifluorotoluene 98% 65-135 <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> Gasoline Range Organics 16000 1400 ppmv 100 " <br /> Benzene 190 16 " <br /> Toluene 610 13 <br /> Ethylbenzene 56 12 <br /> Xylenes(total) 230 12 ^ " <br /> Methyl tert-butyl etber 2100 56 <br /> Surrogate a a a-Trifluorotoluene 98% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> equota 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 3 of 8 <br />