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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 1965 <br /> Analytical <br /> 4D— (707)792- <br /> FAX(707)792-0342342 <br /> www sequoialabs com <br /> i <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/05 14 14 <br /> Industrial Solvents by EPA Method 8015B modified -Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch SB18011 -EPA 3810 Headspace/EPA 8015Bm <br /> Blank(5B18011-BLK1) Prepared&Analyzed 02/18/05 <br /> Methanol ND 100 ug/1 <br /> Surrogate 1-pentanol 2580 2500 103 75-120 <br /> Laboratory Control Sample(51118011-BSI) Prepared&Analyzed 02/18/05 <br /> Methanol 1040 100 ugfl 1000 104 30-150 <br /> Surrogate 1-pentanol 2680 2500 107 75-120 <br /> Matrix Spike(51118011-MSI) Source P502227-01 Prepared&Analyzed 02/18/05 <br /> Methanol 1020 100 ugfl 1000 ND 102 30-150 <br /> Surrogate 1-pentanol 2570 2500 103 75-120 <br /> Matrix Spike Du (51318011-MSD1) Source P502227-01 Prepared&Analyzed 02/18/05 <br /> Methanol 1050 100 ugll 1000 ND 105 30-150 3 20 <br /> Surrogate I-pentanol 2630 2500 105 75-120 <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 mast be reproduced in its entirety <br /> Page 12 of 18 <br />