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i <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707) 792 1865 <br /> a- —)► Analytical FAX(707) 792 0342 <br /> ww-w sequat ala6s coin. <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P312141 <br /> 3017 Kilgare Road Suite 100 Project Number [none] Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/22/03 14 28 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/802IB <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF(P312141-06)Air Sampled 12/03/03 14 40 Received 12/03/03 15 40 <br /> Gasoline Range Organics 2200 50 mg/m'Air l 3120158 12/06/03 12/06/03 EPA <br /> 8015B/8021B <br /> Benzene ND 050 " <br /> Toluene 46 050 " <br /> Ethylbenzene 68 050 " <br /> Xylenes(total) 390 050 " <br /> Methyl tert-butyl ether 6 8 2 0 " <br /> Surrogate a,a a-Trrfluorotoluene 82% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 125% 65-135 " <br /> Gasoline Range Organics 630 14 ppmv " <br /> Benzene ND 016 " <br /> Toluene 12 013 " <br /> Ethylbenzene 16 0 12 <br /> Xylenes(total) 91 012 <br /> Methyl tert-butyl ether 19 056 " <br /> Surrogate aa a-Triuorotoluene 82% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 125% 65-135 <br /> AS-EFF(P312141-07)Air Sampled 12/03/03 14 35 Received 12/03/03 15 40 <br /> I <br /> Gasoline Range Organics 57 25 mgW Air 0 5 3120158 12/06/03 12/06/03 EPA <br /> 8015B/8021B <br /> Benzene 21 025 <br /> Toluene 46 025 " <br /> Ethylbenzene 090 025 <br /> Xylenes(total) 84 025 <br /> Methyl tert-butyl ether 30 10 " <br /> Surrogate a,a,a-Trifluorotoluene 96% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 93% 65-135 " <br /> Gasoline Range Organics 16 71 ppmv 05 " <br /> Benzene 067 0 080 <br /> Toluene 12 0 065 " " " " " <br /> Ethylbenzene 021 0 060 " <br /> Xylenes(total) 19 0 060 " <br /> Methyl tert-butyl ether 85 028 " <br /> Surrogate a a a-Trtfluorotoluene 96% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 93% 65-135 " <br /> Sequoia Analytical-Petaltuna 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 /> bases This analytical report must be reproduced in its entirety <br /> Page 4 of 16 <br />