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4D (707) <br /> 1455 McDowell Blvd Ste D <br /> Sequoia PetalumaCA CA 94954 <br /> 792-1665 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P409434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/08/04 09 40 <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 Note <br /> MW-1 (P409434-01)Water Sampled 09/23/04 11 45 Received 09/23/04 13 15 <br /> Methanol ND 100 ugA 1 4301006 10/01/04 10/01/04 EPA 8015Bm <br /> Surrogate 1-pentanol 81% 62-119 " <br /> MW-2(P409434-02)Water Sampled 09/23/04 03 52 Received 09/23/04 13 15 <br /> Methanol ND 100 ugA 1 4101006 10/01/04 10/01/04 EPA 8015Bm <br /> Surrogate 1 pentanol 99% 62-1.29 " <br /> MW-3(P409434-03)Water Sampled 09/23/04 03 56 Received 09/23/04 13 15 <br /> Methanol ND 100 ugA 1 4101006 10/01/04 10/01/04 EPA 8015Bm <br /> Surrogate 1 pentanol 97% 61-129 " <br /> MW4(P409434-04)Water Sampled 09/23/04 04 18 Received 09/23/04 13 15 <br /> Methanol ND 15Q ugA 1 4101006 10/01/04 10/01/04 EPA 8015Bm DF <br /> Surrogate I pentanol 90% 62-129 " <br /> -5(P409434-05)Water Sampled 09/23/04 04 28 Received 09/23/04 13 15 <br /> Methanol ND 100 ugA 1 4301006 10/01/04 10/01/04 EPA 8015Bm <br /> Surrogate 1 pentanol 101% 62429 " <br /> MW-6(P409434-06)Water Sampled 09/23/04 04 26 Received 09/23/04 13 15 <br /> Methanol ND 100 ugA I 4JO1006 10/01/04 10/01/04 EPA 8015Bm <br /> Surrogate 1 pentanol 98% 62-129 " <br /> MW-7(P409434-07)Water Sampled 09/23/04 04 24 Received 09/23/04 13 15 <br /> Methanol ND 100 ugA I 4JO1006 10/01/04 10/01/04 EPA 8015Bm <br /> Surrogate 1-pentanol 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 /> This analytical report must be reproduced in its entirety <br /> Page 3 of 21 <br />