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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P502227 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/26/05 14 14 <br /> Industrial Solvents by EPA Method 8015B modified <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Now <br /> MW-5(PS02227-01)Water Sampled 02/11/05 15 30 Received 02/14/05 10 50 <br /> Methanol ND 100 ug/l I 5B18011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate I-pentanol 104% 75-120 " <br /> MW-6(P502227-02)Water Sampled 02/11/05 14 50 Received 02/14/05 10 50 <br /> Methanol ND 100 ugn I 5B18011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate 1 pentanol 99% 75-120 " <br /> MW-7(P502227-03)Water Sampled 02/11/05 15 20 Received 02/14/05 10 50 <br /> Methanol ND 100 ug/l 1 5B18011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate 1-pentanol 102% 75-120 " <br /> MW-8(P502227-04)Water Sampled 02/11/05 15 00 Received 02/14/05 10 50 <br /> Methanol ND 100 ug/l 1 5BI9011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate 1 pentanol 101 % 75-120 " <br /> �MW-9(P502227-05)Water Sampled 02/11/05 12 25 Received 02/14/05 10 50 <br /> Methanol ND 100 ugA 1 51318011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate 1 pentanol 105% 75-120 <br /> MW-10(P502227-06)Water Sampled 02/11/05 15 10 Received 02/14/05 10 50 <br /> Methanol ND 100 ug/l I 5B18011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate 1 pentanol 108% 75-120 " <br /> MW-11 (P502227-07)Water Sampled 02/11/05 15 40 Received 02/14/05 10 50 <br /> Methanol ND 100 ug/1 I 5BI8011 02/18/05 02/18/05 EPA 8015Bm <br /> Surrogate 1 pentanol 98% 75-120 11 11 " <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 slated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 3 of 18 <br />