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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> iz_ <br /> Analytical (707)792-1$65 <br /> FAX(707)792-0342 <br /> www sequotalabs com <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 12/04/04 14 40 <br /> Industrial Solvents by EPA Method 8O15B modified <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Ihlution Batch Prepared Analyzed Method Note <br /> MW-5(P411364-01)Water Sampled 11/12/04 14 00 Received 11/15/04 12 57 <br /> Methanol ND 100 ug/l 1 4K19007 11/19/04 11/19/04 EPA 801513m <br /> Surrogate I pentanol 107% 62-129 <br /> MW-6(P411364-02)Water Sampled 11/12/04 13 45 Received 11/15/04 12 57 <br /> Methanol ND 100 ug/l 1 4K19007 11/19/04 11/19/04 EPA 8015Bm <br /> Surrogate 1 pentanol 103% 62-129 <br /> MW-7(P411364-03)Water Sampled 11/12/04 15 15 Received 11/15/04 12 57 <br /> Methanol ND 100 ugh I 4K19007 11/19/04 11/19/04 EPA 8015Bm <br /> Surrogate 1 pentanol 107% 62-129 " <br /> MW-8(P411364-04)Water Sampled 11/12/04 14 35 Received 11/15/04 12 57 <br /> Methanol ND 100 ug/1 I 4K19007 11/19/04 11/19/04 EPA 8015Bm <br /> Surrogate 1 pentanol 102% 62-129 " <br /> _MW-9(P411364-05)Water Sampled 11/12/04 11 25 Received 11/15/04 12 57 <br /> Methanol ND 100 ug/1 I 4K19007 11/19/04 11/19/04 EPA 8015Bm <br /> Surrogate I pentanol 106% 62-129 " <br /> MW-10(P411364-06)Water Sampled 11/12/04 14 55 Received 11/15/04 12 57 <br /> Methanol ND 100 ug/1 I 4K19007 11/19/04 11/19/04 EPA 8015Bm <br /> Surrogate I pentanol 113% 62-129 " <br /> MW-11 (P411364-07)Water Sampled 11/12/04 14 20 Received 11/15/04 12 57 <br /> Methanol ND 100 ug/1 1 4KI9007 11/19/04 11/19/04 EPA 8015Bm <br /> Surrogate I-pentanol 106% 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 /> This analytical report must be reproduced in its entirety <br /> Page 3 of 19 <br />