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i <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical tFAX(707)792-0342 <br /> WWW sequoialabs com <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 80I5B modified <br /> Sequoia Analytical-Morgan Hill <br /> Reportmg <br /> Analyte Result Lunt Units Dilution Batch Prepared Analyzed Method Note <br /> VW-1(P406495-16)Water Sampled 06/24/04 21 23 Received 06/25/04 09 30 <br /> Methanol ND 100 ugA 1 41730011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1 pentanol 96% 62-129 „ <br /> VW-2(P406495-17)Water Sampled 06/24/04 03 45 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/l I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1-pentanol 98% 62-129 <br /> VW-3(P406495-18)Water Sampled 06/24/04 20 39 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/I 1 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1 pentanol 100% 62-129 <br /> VW-4(P406495-19)Water Sampled 06/24/04 02 59 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/I I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1-pentanol 99% 62-129 <br /> -S(P406495-20)Water Sampled 06/24/04 20 56 Received 06/25/04 09 30 <br /> ethanol ND 100 ug/1 1 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate 1 pentanol 100% 62-129 <br /> VW-7(P406495-21)Water Sampled 06/24/04 04 09 Received 06/25/04 09 30 <br /> Methanol ND 100 ug/1 I 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate I-pentanol 98% 62-129 <br /> VW-8(P406495-22)Water Sampled 06/24/04 21 58 Received 06/25/04 09 30 <br /> I <br /> Methanol ND 100 ug/l 1 4F30011 06/30/04 06/30/04 EPA 8015Bm <br /> Surrogate I pentanol 92% 62-119 „ <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> Thu analytical report must be reproduced in its entirety <br /> Page 15 of 41 <br />