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. 1455 McDowell Blvd North Ste <br /> a— ) <br /> Sequoia Petaluma CA 949544 <br /> 4 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> . www sequoialahs cam <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P405138 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/27/04 18 30 <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 4E14005-EPA 3810 Heads ace <br /> Blank(4E14005-BLK1) Prepared&Analyzed 05/14/04 <br /> Methanol ND loo ug/l <br /> Surrogate I pentanol 2130 2500 852 62-129 <br /> Laboratory Control Sample(4E14005-BSI) Prepared&Analyzed 05/14/04 <br /> Methanol 950 100 ug/l 1000 950 68 130 <br /> Surrogate 1 pentanol 2500 2500 100 62-129 <br /> Matrix Spike(4E14005-MS1) Source P405138-01 Prepared&Analyzed 05/14/04 <br /> Methanol 857 100 ug/l 1000 ND 857 68-130 <br /> Surrogate 1 pentanol 2410 2500 964 62-129 <br /> Matrix Spike Dup(4E14005-MSD1) Source P405138-01 Prepared&Analyzed 05/I4/04 <br /> ethanol 878 100 ug/l 1000 ND 878 68-130 242 19 <br /> -mmurrugate 1 pentanol 2450 11 2500 980 62-129 <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 6 of 11 <br />