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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (i) (707)792-1865 <br /> q/ Analytical FAX(707)792-0342 <br /> www sequoialabs com. <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA <br /> P40307$ <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/19/04 15 02 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> INF(P403078-01)Air Sampled 03/03/04 10 50 Received 03/04/04 08 55 HT-05 <br /> Gasoline Range Organics 1200 25 mg/in'Air 0 5 4030129 03/05/04 03/05/04 EPA <br /> 8015B/8021B <br /> Benzene 55 025 " <br /> Toluene 30 025 " <br /> Ethylbenzene 27 025 " <br /> Xylenes(total) 210 025 " <br /> Methyl tert-butyl ether 23 1 0 CFI <br /> Surrogate a a a-Trifluorotoluene 95% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 130% 65-135 " <br /> Gasoline Range Organics 340 71 ppmv 0 5 " <br /> Benzene 17 0 080 " <br /> Toluene 80 0065 " <br /> Ethylbenzene 62 0 060 " <br /> Xylenes(total) 49 0 060 " <br /> Methyl tert-butyl ether 063 028 CF <br /> Surrogate a a a-Trefluorotoluene 95% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 130% 65-135 " <br /> AS-EFF(P403078-02)Air Sampled 03/03/0410 40 Received 03/04/04 08 55 <br /> Gasoline Range Organics 77 25 mg/ml Air 05 4030129 03/05/04 03/05/04 EPA <br /> 6015B/8021B <br /> Benzene 077 025 " <br /> Toluene 18 025 " <br /> Ethylbenzene 046 025 " <br /> Xylenes(total) 3 2 025 " <br /> Methyl tert-butyl ether 200 1 0 " <br /> Surrogate a a a-Trijluorotoluene 108% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 " <br /> Gasoline Range Organics 22 7 1 ppmv 0 5 " <br /> Benzene 024 0080 " <br /> Toluene 048 0 065 <br /> Ethylbenzene 0 11 0 060 " <br /> Xylenes(total) 073 0 060 " <br /> Methyl tert-butyl ether 56 028 " <br /> Surrogate a a a-Trfluorotoluene 108% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 " <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ojcustody 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 23 <br />