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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma. 94954 <br /> �► Analytical (707)79 79 2-x <br /> 865 <br /> FAX(707)792-0342342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Plumber WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <br /> Industrial Solvents by EPA Method 8015B modified - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Aoalyto Result Limit Units Level Result °/6REC Limits RPD limit Notes <br /> Batch 4J04018-EPA 3810 Headspace/EPA 801513m <br /> Matnx Spike Dup(4304018-MSDI) Source P409434-08 Prepared&Analyzed 10/04/04 <br /> Methanol 989 100 ug/l 1000 ND 99 68-130 12 19 <br /> Surrogate 1-pentanol 2380 2500 95 62-129 <br /> Sequoia Analytical-Petaluma The results to 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 werght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 21 <br />