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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 /> i <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 Ltmit ilmts Dilution Batch Prepared Analyzed Method Note <br /> MW-1(P406495-01)Water Sampled 06123/04 03 49 Received 06/25/04 09 30 <br /> Methanol ND 100 ugA I 4F29007 06/29/04 06/29/04 EPA 8015Bm <br /> Surrogate I-pentanol 95% 61-129 " <br /> MW-2(P406495-02)Water Sampled 06/23/04 05 02 Received 06/25/04 09 30 <br /> Methanol ND 100 ugA 1 41729007 06/29/04 06/29/04 EPA 80156m <br /> Surrogate I-pentanol 100% 62-129 " <br /> MW-3(P406495-03)Water Sampled 06/23/04 04 34 Received 06125/04 09 30 <br /> Methanol ND 100 ug/1 I 4F29007 06/29/04 06/29/04 EPA 8015Bm <br /> Surrogate 1 pentanol 102% 62-129 " <br /> MW-4(P406495-04)Water Sampled 06/23/0403 10 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/l 1 4F29007 06/29/04 06/29/04 EPA 8015Bm <br /> Surrogate 1 pentanol 102% 62-129 " <br /> -5(P406495-05)Water Sampled 06123/04 05 47 Received 06/25104 09 30 <br /> Methanol ND 200 ug/l 1 4F29007 06/29/04 06/29/04 EPA 8015Bm R-01 <br /> Surrogate I pentanol 82% 62-129 " <br /> MW-7(P406495-06)Water Sampled 06/23/04 02 35 Received 06/25/04 09 30 <br /> Methanol ND 100 ugA 1 4F29007 06129104 06/29/04 EPA 8015Bm <br /> Surrogate 1 pentanol 97% 62-129 " <br /> MS-2A(P406495-07)Water Sampled 06/23/04 06 40 Received 06/25/04 09 30 <br /> Methanol ND 100 ugA 1 4F29007 06/29/04 06/29/04 EPA 8015Bm <br /> Surrogate 1-pentanal 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 an a wet weight basis <br /> . This analytical report must be reproduced in its entirety <br /> Page 13 of 41 <br />