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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> FAX 342 <br /> Analytical wwseg07ialabs om <br /> . www se4uoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P402408 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/02/04 10 16 <br /> Industrial Solvents by EPA Method 8015B modified - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source °/REC RPD <br /> Analyte Result Limit Units level Result %REC Limits RPD Limit Notes <br /> Batch 4B23007-EPA 3810 Heads ace <br /> Blank(4B23007-BLK1) Prepared&Analyzed 02/23/04 <br /> Methanol ND 100 ug/l <br /> Surrogate 1 pentanol 1030 1500 812 62-129 <br /> Laboratory Control Sample(4B23007-BSI) Prepared&Analyzed 02/23/04 <br /> Methanol 914 100 ug/1 1004 914 68-130 <br /> Surrogate 1-pentanol 2520 2500 101 62-129 <br /> Matrix Spike(4B23007-MSI) Source P402408-02 Prepared&Analyzed 02/23/04 <br /> Methanol 992 100 u9/1 1000 ND 992 68-130 <br /> Surrogate 1 pentanol 2690 1500 108 62-119 <br /> Matrix Spike Du (4B23007-MSDI) Source P402408-02 Prepared&Analyzed 02/23/04 <br /> ethanol 972 100 ug/I 1000 ND 972 68-130 204 19 <br /> arrogate 1 pentanol 1570 2500 103 62-119 <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 slated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page 13 of 18 <br />