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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> ISN (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequolalabs corn <br /> i <br /> rS" <br /> S Corp-Sacramento Project Arco Site 6100,Tracy,CA P403161 <br /> 70 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> ramento CA,95833 Project Manager Jay Johnson 03/11/04 11 27 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> 61002 INF 3904(P403161-01)Air Sampled 03/09/04 11 24 Received 03/10/04 10 00 <br /> Gasoline Range Organics(C6-C10) 2500 250 mg/m'Air 5 4030228 03/10/04 03/10/04 EPA <br /> 8015B/8021B <br /> Benzene 25 25 " " " QR-04 <br /> Toluene 33 25 <br /> Ethylbenzene 26 25 <br /> Xylenes(total) 16 25 <br /> Methyl tert-butyl ether 35 10 QR-04 <br /> Surrogate a a a-Trifluorotoluene 100% 65-135 " <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 " <br /> Gasoline Range Organics(C6-C10) 720 71 ppmv 5 <br /> Benzene 78 080 QR-04 <br /> Toluene 89 065 <br /> Ethylbenzene ND 060 <br /> Wnes(total) 36 060 <br /> hyl tert-butyl ether 97 28 QR-04 <br /> Surrogate a a a-Trtfluorotoluene 100% 65-135 <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 " <br /> 6100 2 EFF 3904(P403161-02)Air Sampled 03/09/04 11 22 Received 03/10/04 10 00 <br /> Gasoline Range Organics(C6-C 10) ND 10 mg/m'Air 02 4030228 03/10/04 03/10/04 EPA <br /> 8015B/8021B <br /> Benzene ND 010 <br /> toluene ND 010 <br /> Ethylbenzene ND 0 10 <br /> Xylenes(total) ND 0 10 <br /> Methyl tert-butyl ether ND 040 " <br /> Surrogate aa a-Trifluorotoluene 95% 65-135 <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 <br /> Gasoline Range Organics(C6-C10) ND 2 8 ppmv 0 2 <br /> Benzene ND 0 032 <br /> Toluene ND 0 026 <br /> Ethylbenzene ND 0 024 <br /> Xylenes(total) ND 0 024 " <br /> Methyl tert-butyl ether ND 0 11 " <br /> Surrogate a a,a-Trifluarotoluene 95% 65-135 <br /> Surrogate 4-Bromofluorobenzene 95% 65-135 <br /> �uola 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 an a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 3 of 6 <br />