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tl <br /> til <br /> 1455 McDowell Blvd North Ste 4 <br /> Sequoia Petalnma,CA94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrlm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 59 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-7(P309471-14)Water Sampled 09/24/03 06 00 Received 09/24/03 08 30 <br /> Tert-amyl methyl ether ND 10 ugll 1 3100164 10/07/03 10/08/03 EPA 8260B <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 ^ " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 85% 74-135 " <br /> Surrogate Toluene-d8 103910 84-119 " <br /> VW-8(P309471-15)Water Sampled 09/24/03 03 23 Received 09/24/03 08 30 <br /> IW ert-amyl methyl ether ND 10 ug/I 10 3100164 10/07/03 10/08/03 EPA 82608 <br /> Benzene 140 5 0 " <br /> Tert-butyl alcohol ND 200 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 1000 " <br /> Ethylbenzene 200 5 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 50 " <br /> Toluene ND 5 0 " <br /> Xylenes(total) 270 5 0 " <br /> Surrogate Dibromofluoromethane 97% 84-122 " <br /> Surrogate 12-Dtchloroethane-d4 86% 74-135 <br /> Surrogate Toluene-d8 103% 84-119 " <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 13 of 30 <br />