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.1 <br /> 1455 McDowell Blvd North Ste 4 <br /> a- ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Protect 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 Hall <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lmut Notes <br /> Batch 409010-EPA 3810 Headspace <br /> Matrix Spike Dup(4C19010-MSD1) Source P403188-20 Prepared&Analyzed 03/19/04 ^ <br /> Methanol 1040 100 ug/l 1000 ND 104 68-130 199 19 QC21 <br /> Surrogate 1 pentanol 1710 1500 109 61-119 <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 24 of 34 <br />