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I 1455 McDowell Blvd,North Ste D <br /> }7equo)<`d Petaluma,CA 44954 <br /> 79 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> • www.sequoialabs.clahs.cornm <br /> URS Corp-Sacrarnento Project: Arco Site 5469,Stockton,CA P309139 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 10/16/03 19:28 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte kesult Limit Units Dilution Batch Prepared Analyzed Method Nates <br /> MW-5(P309139-05)Water Sampled:09/09/03 07:30 Received: 09/09/03 10:20 PH <br /> Tert-amyl methyl ether ND 50 ug11 50 3090504 09/22/03 09/22/03 EPA 8260B <br /> Benzene ND 25 " <br /> Tert-butyl alcohol ND 1000 " <br /> Di-isopropyl ether ND 50 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> 1,2-Dichloroethane ND 25 " <br /> Ethanol ND 5000 " <br /> Ethylbenzene ND 25 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Methyl tent-butyl ether 1100 25 " <br /> Toluene ND 25 " <br /> Xylenes(total) ND 25 " <br /> Surrogate:Dibromofluoromethane 95% 84-121 " <br /> arrogate: 1,1-Dichloroethane-d4 89% 74-135 <br /> rrogate: Toluene-& 102% 84-119 <br /> Surrogate:4-Bromofluorobenzene 100% 86-119 <br /> MW-6(P309139-06)Water Sampled:09/09/0306:50 Received: 09/09/03 10:20 <br /> Tert-amyl methyl ether ND 5000 ug/l 5000 3090442 09/19/03 09!19103 EPA 9260B <br /> Benzene ND 2500 " <br /> Tert-butyl alcohol ND 100000 " <br /> Di-isopropyl ether ND 5000 " <br /> 1,2-Dibromoethane(EDB) ND 2500 <br /> 1,2-Dichloroethane ND 2500 <br /> Ethanol ND 500000 " <br /> Ethylbenzene ND 2500 " <br /> Ethyl tert-butyl ether ND 5000 " <br /> Methyl tert-butyl ether 49000 2500 " <br /> Toluene ND 2500 " <br /> Xylenes(total) ND 2500 " <br /> Surrogate:Dibromofluoromethane 104% 84-121 " <br /> !, Surrogate: 1,2-Dichloroethane-d4 105% 74-135 <br /> Surrogate: Toluene-d8 97% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 103% 86-119 " <br /> The results in this report apply to the samples analyzed in accordance with the chain of <br /> Sequoia Analytical-Petaluma p ppy p y <br /> custody document. Unless otherwise slated,results are reported on a wet weighs basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 14 of 38 <br />