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p <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) <br /> Analytical (707)792-0865 <br /> FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P411364 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/04/0414 40 <br /> Industrial Solvents by EPA Method 8015B modified - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporung Spike Source %REC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4K19007-EPA 3810 Heads ace/EPA 801 513m <br /> Blank(4K19007-BLKI) Prepared&Analyzed 11/19/04 <br /> Methanol ND 100 ug/1 <br /> Surrogate J pentanol 2360 2500 94 62-119 <br /> Laboratory Control Sample(4K19007-BS1) Prepared&Analyzed 11/19/04 <br /> Methanol 739 100 ug/1 1000 74 68-130 <br /> Surrogate 1 pentanol 2790 2500 112 62-129 <br /> Matrix Spike(4K19007-MS1) Source MNK0615-07 Prepared&Analyzed 11/19/04 <br /> Methanol 894 100 ugfl 1000 ND 89 68-130 <br /> Surrogate 1 pentanol 2420 2500 97 62-129 <br /> Matrix Spike Dup(4K19007-MSDI) Source MNK0615-07 Prepared&Analyzed 11/19/04 <br /> Methanol 881 100 ugA 1000 ND 88 68-130 1 19 <br /> 4urrogate J 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 /> isThis analytical report must be reproduced in its entirety <br /> Page 12 of 19 <br />