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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX( 792 0342 <br /> www sequosquotalabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy, CA P411271 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 11/15/04 13 28 <br /> Purgeable Hydrocarbons by EPA 8015B <br /> Sequoia Analytical- Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> 6100CINF2111104(P411271-01)Air Sampled 11/11/04 07 00 Received 11/12/04 09 00 <br /> Gasoline Range Organics(C4-C12) 2200 500 mg/m3 Air 10 4110338 11/12/04 11/12/04 EPA 80156-VOA <br /> 1130 <br /> Surrogate 4-Bromofluorobenzene 100% 65-135 <br /> Gasoline Range Organics(C4-C12) 630 140 ppmv 10 " <br /> Surrogate 4-Bromofluorobenzene 100% 55-135 <br /> 6100EFF2111104(P411271-02)Air Sampled 11/11/04 07 05 Received 11/12/04 09 00 <br /> Gasoline Range Organics(C4-C12) ND 50 mg/m3 Air 1 4110338 11/12/04 11/12/04 EPA S015B-VOA <br /> 1102 <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 " <br /> Gasoline Range Organics(C4-C12) ND 14 ppmv " <br /> Surrogate 4-Bromofluorobenzene 101 % 65-135 <br /> uoia 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 3 of 10 <br />