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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petal(ni) 94954 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Industrial Solvents by EPA Method 8015B modified <br /> Sequoia Analytical -Morgan Hill <br /> Reporting <br /> Analyte Result Limit Units Ehluuon Batch Prepared Analyzed Method Note <br /> MS-2B(P406495-08)Water Sampled 06/23/04 07 38 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/1 1 4F29007 06/29/04 06/29/04 EPA 8015Bm <br /> Surrogate 1 pentanol 100% 62-119 " <br /> MS-3A(P406495-09)Water Sampled 06/23/0406 15 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/1 1 4F29007 06/79/04 06/29/04 EPA 8015Bm <br /> Surrogate I pentanol 106% 62-129 " <br /> VW-11(P406495-10)Water Sampled 06/23/04 07 24 Received 06/25/04 09 30 <br /> Methanol ND 100 Ug/1 I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1 pentanol 96% 62-119 " <br /> MS-1A(P406495-11)Water Sampled 06124/0402 19 Received 06/25/04 09 30 <br /> Methanol ND 100 ugll I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1 pentanol 100% 62-129 " <br /> �S-1B(P406495-12)Water Sampled 06/24/04 04 29 Received 06/25/04 09 30 <br /> ter: <br /> Methanol ND 100 ugA I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate I pentanol 100% 62-129 " <br /> MS-3B(P406495-13)Water Sampled 06/24/0421 35 Received 06/25/04 09 30 <br /> Methanol ND 100 ugfl I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate I-pentanol 103% 62-129 " <br /> MW-6(P406495-14)Water Sampled 06/24/04 02 43 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/1 i 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1 pentanol 97% 62-129 " <br /> Sequoia Analytical-Petaluma The results to 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 14 of 41 <br />