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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a_ _� <br /> Analytical (707)792-1865 <br /> FAx(707)792-0342 <br /> www sequoialabs com <br /> 10 <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <br /> Industrial Solvents by EPA Method 8015D 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 4301006-EPA 3810 Headspace/EPA 801513m <br /> Blank(4301006-BLK1) Prepared&Analyzed 10/01/04 <br /> Methanol ND 100 ugn <br /> Surrogate I pentanol 2180 2500 91 61-129 <br /> Laboratory Control Sample(4J01006-BSI) Prepared&Analyzed 10/01/04 <br /> Methanol 883 100 ug/I 1000 88 68-130 <br /> Surrogate I pentanol 2470 2500 99 62-129 <br /> Matnx Spike(4J01006-MSI) Source P409434-03 Prepared&Analyzed 10/01/04 <br /> Methanol 862 100 ug/I 1000 ND 86 68-130 <br /> Surrogate 1 pentanol 2410 2500 96 62-129 <br /> Matnx Spike Dup(4J01006-MSDI) Source P409434-03 Prepared&Analyzed 10/01/04 <br /> Methanol 956 100 ug/I 1000 ND 96 68-130 10 19 <br /> ogate I-pentanol 2480 2500 99 62-129 <br /> Batch 4JO4018-EPA 3810 Headspace/EPA 8015Bm <br /> Blank(4J04018-BLK1) Prepared&Analyzed 10/04/04 <br /> Methanoi ND 100 ug/1 <br /> Surrogate I-pentanol 2120 2500 85 62-129 <br /> Laboratory Control Sample(4J04018-BSI) Prepared&Analyzed 10/04/04 <br /> Methanoi 955 100 ug/I 1000 96 68-130 <br /> Surrogate 1 pentanol 2310 2500 93 62-129 <br /> Matrix Spike(4J04018-MSI) Source P409434-08 Prepared&Analyzed 10/04/04 <br /> Methanol 1110 100 ug/1 1000 ND 111 68-130 <br /> Surrogate I-pentanol 2480 " 2500 99 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 /> . <br /> Thts analytical report must be reproduced in its entirety <br /> Page 13 of 21 <br />