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1455 McDowell Blvd,North Ste D <br /> Sequoia PeWuuma,CA 954— ) <br /> 65 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <br /> Industrial Solvents by EPA Method 8015B modified- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporiing Spike Source %REC RPD <br /> ImIlly, Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4017009-EPA 3810 Headspace <br /> Blank(4017009-BLKI) Prepared&Analyzed 03/17/04 <br /> Methanol ND 100 ug/1 <br /> Surrogate I-pentanol 2500 1500 100 62-129 <br /> Laboratory Control Sample(4Ci7009-BSI) Prepared&Analyzed 03/17/04 <br /> Methanol 932 100 ug/1 1000 932 68-130 <br /> Surrogate I pentanol 2460 2500 984 61 129 <br /> Matrix Spike(4017009-MS1) Source P403188-01 Prepared&Analyzed 03/17/04 <br /> Methanol 1940 100 ug/l 1000 1300 640 68 130 QM02 <br /> Surrogate 1 pentanol 2440 2500 976 61-129 <br /> Matrix Spike Dup(4C17009-MSDI) Source P403188-01 Prepared&Analyzed 03/17/04 <br /> Methanol 1870 100 ug/l 1000 1300 570 68 130 367 19 QM02 <br /> rrag ite 1 pentanol 2350 2500 940 62-129 <br /> Batch 4CI9010-EPA 3810 Heads ace <br /> Blank(4C19010-BLKI) Prepared&Analyzed 03/19/04 <br /> Methanol ND 100 ug/1 <br /> Surrogate 1 pentanol 2220 2500 888 62-129 <br /> Laboratory Control Sample(4C19010-BSI) Prepared&Analyzed 03/19/04 <br /> Methanol 919 100 ugll 1000 919 68130 <br /> Surrogate 1-pentanol 1480 2500 992 62-129 <br /> Matrix Spike(4C19010-MSI) Source P403188-20 Prepared&Analyzed 03/19/04 <br /> Methanol 1270 100 ugfl 1000 ND 127 68130 <br /> Surrogate I pentanol 1780 2500 712 62-129 <br /> I <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 23 of 34 <br />