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1455 McDowell Blvd North Ste D <br /> Seq uoia Petaluma CA 94954 <br /> (D (707)792-1865 <br /> W Analytical FAX(707)792-0342 <br /> www sequoialabs cam <br /> 70 URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P403162 <br /> 2 <br /> Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/11/04 11 36 <br /> Purgeable Hydrocarbons and BTEX by EPA 801513/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> 6100 1 INF 3904(P403162-01)Air Sampled 03/09/04 11 30 Received 03/10/04 10 00 <br /> Gasoline Range Organics(C6-C10) 2800 250 mg/m'Air 5 4030228 03/10/04 03/10/04 EPA <br /> 80158/8021B <br /> Benzene 12 25 QR-04 <br /> Toluene 72 25 QR-04 <br /> Ethylbenzene ND 2 5 <br /> Xylenes(total) 41 2 5 <br /> Methyl tert-butyl ether 51 10 <br /> Surrogate a,a,a-Trifluorotoluene 106% 65-135 <br /> Surrogate 4-Bromofluorobenzene 97% 65-135 " <br /> Gasoline Range Organics(C6-C10) 800 71 ppmv 5 <br /> Benzene 36 080 " " " " " QR-04 <br /> Toluene 19 065 QR-04 <br /> Ethylbenzene ND 0 60 <br /> �nes (total) 9 5 0 60 <br /> hyl tert-butyl ether 14 2 8 <br /> Surrogate a a a-Trifluorotoluene 106% 65-135 <br /> Surrogate 4-Brornofluorobenzene 97% 65-135 " <br /> 6100 1 EFF 3904(P403162-02)Air Sampled 03/09/04 11 28 Received 03/10/04 10 00 <br /> Gasoline Range Organics(C6-C10) 28 10 mg/m'Air 0 2 4030228 03/10/04 03/10/04 EPA <br /> 80151318021B <br /> Benzene 031 010 <br /> Toluene ND 010 <br /> Ethylbenzene ND 0 10 <br /> Xylenes(total) ND 0 10 <br /> Methyl tert-butyl ether 041 040 <br /> Surrogate a,a a-Trifluorotoluene 100% 65-135 <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 <br /> Gasoline Range Organics(C6-C10) 81 28 ppmv 02 <br /> Benzene 0 096 0 032 <br /> Toluene ND 0 026 <br /> Ethylbenzene ND 0 024 " <br /> Xylenes(total) ND 0 024 <br /> Methyl tert-butyl ether 0 11 Oil <br /> Surrogate a,a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 <br /> �oia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise staled results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 3 of 6 <br />