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vd North Sic D <br /> Sequoia 1455 tv1cDowcPleta,uma,CA 949544 <br /> Analytical <br /> (707)792 1865 <br /> FAX equoi lab 0342 <br /> www sequoialahs cvm <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P407278 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/11/04 09 51 <br /> BTEX by 8021B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Hatch Prepared Analyzed Method Note <br /> INF(P407278-01)Air Sampled 07/13/04 14 30 Received 07/14/04 08 56 HT-04 <br /> Benzene 3 7 025 mg/ml Air 05 4070288 07/16/04 07/16/04 EPA 8021 B <br /> 1735 <br /> Toluene 10 025 <br /> Ethylbenzene 6 4 025 " <br /> Xylenes(total) 45 025 " <br /> Methyl tert-butyl ether 23 1 2 " <br /> Surrogate a a a-Trruorotoluene 98% 65-135 <br /> Benzene 1 2 0 080 ppmv 05 " <br /> Toluene 2 7 0 065 <br /> Ethylbenzene 1 5 0 060 " <br /> Xylenes(total) 10 0 060 " <br /> Methyl tert-butyl ether 6 5 028 <br /> Surrogate a a a-Tg7uorotoluene 98% 65-135 <br /> . TS INF(P407278-02)Air Sampled 07/13/04 14 40 Received 07/14/04 08 56 HT-04 <br /> Benzene 070 025 mg/ml Air 05 4070288 07/16/04 07/16/04 EPA 8021 B <br /> 1707 <br /> Toluene 1 7 025 " <br /> Ethylbenzene 087 025 " <br /> Xylenes(total) 5 9 025 " <br /> Methyl tert-butyl ether 47 12 <br /> Surrogate a a,a-Triuorotoluene 97% 65-135 " <br /> Benzene 022 0 080 ppmv 05 " <br /> Toluene 044 0 065 ^ <br /> Ethylbenzene 020 0 060 ^ <br /> Xylenes(total) 14 0 060 <br /> Methyl tert-butyl ether 13 029 " <br /> Surrogate a,a,a-Trifluorotoluene 96% 65-135 " <br /> Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 17 <br />