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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> 1W Analytical FAX(707)792-0342 <br /> 0 www sequoialahs cont <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P312071 <br /> 2870 Gateway Oaks Drive Suite 300 Prglect Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/22/03 13 I8 <br /> Industrial Solvents by EPA Method 8015B modified- Quahty Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br /> Batch 3LO9010-EPA 3810 Heads ace <br /> Blank(3L09010-BLKI) __Prepared&Analyzed 12/09/03 <br /> Methanol ND 100 119/1 <br /> Surrogate /pentanol 2500 2500 100 62-129 <br /> Laboratory Control Sample 3L09010-BSI) Prepared&Analyzed 12/09/03 <br /> Methanol 983 100 ug/1 1000 98 3 68-130 <br /> Surrogate 1 pentanol 2550 2500 102 62-129 <br /> Matrix Spike 3L09010-MSI Source MML0113-04 Prepared&Analyzed 12/09/03 <br /> Methanol 808 100 ug/l 1000 ND 80 8 68-130 <br /> Surrogate 1-pentanol 2130 2500 852 62-129 <br /> Matnx Spike Du 3L09010-MSD/ Source MML0113-04 Prepared&Analyzed 12/09/03 <br /> Methanol 892 100 119/1 1000 ND 892 68-130 9 88 19 <br /> rrogate I-pentanol 2340 2500 93 6 62-129 <br /> Batch 3L10016-EPA 3810 Heads ace <br /> Blank 3L10016-BLKI Prepared&Analyzed 12/10/03 <br /> Methanol ND 100 ug/I <br /> Surrogate 1-pentanol 2410 2500 964 62-129 <br /> Laboratory Control Sam le 3L1001CrBS1 Pre ared&Analyzed 12/10/03 <br /> Methanol 914 100 u9/1 1000 914 68-130 <br /> Surrogate 1-pentanol 2410 2500 964 62-129 <br /> Laboratory Control Sample Du (3LI0016-BSD1) Prepared&Analyzed 12/10/03 <br /> Methanol 10I0 100 ug/I 1000 141 68-130 998 19 <br /> Surrogate /pentanol 2510 2500 100 62-129 <br /> Sequoia Analytical-Petaluma The results in thts report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 12 of 17 <br />