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Sequoia 1455 McDowell 131vd,Notth Ste D <br /> - Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> W, www sequoi labs cam <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Oyu Result Lumt Umts Dilution Batch Prepared Aealyred Method Notes <br /> VW-8(P306252-07)Water Sampled:06/11/03 05 47 Received 06!1210311 45 R-05 <br /> Tert-amyl methyl ether ND 50 Ug/I 5 3060630 06/24/03 06/25/03 EPA 8260E <br /> Tert-butyl alcohol ND 100 ^ „ <br /> Di-isopropyl ether ND 50 „ <br /> Ethanol ND 500 <br /> Ethyl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether ND 25 <br /> Surrogate Dibromofluoromethane .100% 84-122 ^ „ <br /> Surrogate 12-Dichloroethane-d4 96% 74-135 " <br /> Surrogate Toluene-d8 103% 84-119 ^ ^ <br /> VW-10(P306252-08)Water Sampled 06/11/03 05 20 Received 06/12/03 1145 R-05 <br /> Tert-arnyl methyl ether ND 50 ugA 50 3060630 06/24/03 06/25/03 EPA 8260E <br /> Tert-butyl alcohol ND 1000 <br /> Di-isopropyl ether ND 50 <br /> Aftanol ND 5000 <br /> yl tert-butyl ether ND 50 <br /> Methyl tert-butyl ether ND 25 <br /> Surrogate Dtbromolluoromethane 93% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 97% 74-135 ^ ^ <br /> Surrogate Toluene-d8 98% 84-119 <br /> VW-11(P306252-09)Water Sampled 06/111031023 Received 06/12/0311 45 <br /> Tert-amyl methyl ether ND 10 ug/l 1 3060397 06/17/03 06/17/03 EPA 8260D <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 10 <br /> Ethanol ND 100 „ „ •• ^ ^ „ <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 050 <br /> Surrogate Dibromofluoromethane 98% 84-122 <br /> Surrogate 1,2-Dtehloroethane-d4 100% 74-135 ^ ^ ^ <br /> Surrogate Toluene-d& 101% 84-119 <br /> uo1a Analytical-Petaluma Ae results w this report apply to the samples analyzed in accordance with the chain of <br /> custody docrmrent Unless otherwise stated,results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 27 <br />