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1455 McDowell Mvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical PAXequoi labsr42 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy, CA P410118 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 10/11/04 15 36 <br /> Purgeable Hydrocarbons by EPA 8015B <br /> Sequoia Analytical - Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> 6100EFF2I0604(P410118-01)Air Sampled 10/06/04 08 35 Received 10/07/04 09 00 <br /> Gasoline Range Organics(C4-C12) 57 50 mg/m'Air 1 4100138 10/07/04 10/07/04 EPA 8015B-VOA <br /> 1254 <br /> Surrogate 4-Bromofluorobenzene 89% 65-135 11 " " <br /> 11 <br /> Gasoline Range Organics(C4-C12) 16 14 ppmv " <br /> Surrogate 4-Bromofluorobenzene 89% 65-135 " <br /> Dia 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 ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 3 of 9 <br />