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4D1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical (707)792- <br /> 1865 FAX{707)792 0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Nwnber Intrim 50265 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 10/06/03 16 58 <br /> Total Petroleum Hydrocarbons as Gasoline by EPA 8015B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Resent Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090610-EPA 5030 waters <br /> Blank(3090610-BLKI) Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics ND 50 ug/I <br /> Surrogate 4-Brornofluorobenzene 281 300 94 65-135 <br /> Laboratory Control Sample(3090610-BSI) Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics 2390 50 ug/l 2750 87 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 300 99 65-135 <br /> Matrix Spike(3090610-MS1) Source P309407-01 Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics 2340 50 ug/I 2750 19 84 65-135 <br /> Surrogate 4-Bromofluorobenzene 299 300 100 65-135 <br /> Matrix Spike Du (3090610-MSDI) Source P309407-01 Prepared&Analyzed 09/26/03 <br /> Gasoline Range Organics 2370 50 ug/I 2750 19 85 65-135 1 20 <br /> rrogate 4-Bromofluorobenzene 297 300 99 65-135 <br /> �u <br /> Sequoia 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 12 of 16 <br />