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a <br /> 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma.CA 44 <br /> (707)792-1865865 <br /> a_ _� <br /> Analytical www <br /> 92-0342 <br /> scquinalqumalabs corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive Suite 300 Project 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 <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-10(P403188-08)Water Sampled 03/08/04 04 21 Received 03/10/04 08 00 <br /> Methanol ND 100 ugA 1 4C19010 03/19/04 03/19/04 EPA 8015Bm <br /> Surrogate I pentanol 104% 62-119 " <br /> VW-11(P403188-09)Water Sampled 03/08/04 05 34 Received 03/10/04 08 00 <br /> Methanol ND 500 ug/1 1 4C17009 03/17!04 03/17/04 EPA 8015Bm R-03 <br /> Surrogate 1 pentanol 952% 61-129 " <br /> VW-12(P403188-10)Water Sampled 03/08/04 07 04 Received 03/10/04 08 00 <br /> Methanol ND 100 ug/l. 1 4CI7009 03/17/04 03/17/04 EPA 8015Bm <br /> Surrogate I-pentanol 105% 61-129 " <br /> MW-1(P403188-11)Water Sampled 03/09/04 04 26 Received 03/10/04 08 00 <br /> Methanol ND 100 ug/l 1 4C17009 03/17/04 03/18/04 EPA 8015Bm <br /> Surrogate 1 pentanol 996% 62-129 " <br /> W-2(P403188-12)Water Sampled 03/09/04 07 28 Received 03/10/04 08 00 <br /> Methanol ND 100 ug/1 1 4C17009 03/17!04 03/18/04 EPA 8015Bm <br /> Surrogate 1 pentanol 104% 62-119 " <br /> MW-3(P403188-13)Water Sampled 03/09/04 08 27 Received 03/10/04 08 00 <br /> Methanol ND 100 ugA 1 4C17009 03/17/04 03/18/04 EPA 8015Bm <br /> Surrogate I-pentanol 660% 62-129 " <br /> MW-4(P403188-14)Water Sampled 03/09/04 03 43 Received 03/10/04 08 00 <br /> Methanol ND 100 ugA I 4C17009 03/17/04 03/18/04 EPA 8015Bm <br /> Surrogate I pentanol 108% 61-129 " <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 4 of 34 <br />