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85 <br /> # n Hill, Drive <br /> Sequoia Morgan Hill,CAA 93437 <br /> Z— (408)Analytical PAx 772308 <br /> laog 7s <br /> www.sequoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO 44932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOCSD-0001 Reported: <br /> Rancho Cordova CA,95670 Project Manager.Clinton Harms 08/01/05 11:10 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %R-EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5G26006-EPA 5030B PIT/EPA$2608 <br /> Blank(5G26006-BLK1) Prepared&Analyzed:07/26/05 <br /> Cert-Amyl methyl ether ND 0.50 ugll <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 IC <br /> Ethyl tert-butyt ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate:l,1-Dichlorocthane-d4 5.44 5.00 109 60-135 <br /> Blank(5G26006-BLK2) Prepared&Analyzed:07/26/05 <br /> tert-Amyl methyl ether ND 0,50 ug/l <br /> Benzene ND 0.50 " <br /> tent-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tort-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate:1,1-Dichloroethane-d4 6.04 5.00 111 60-135 <br /> Sequoia Analytieai-Morgan Hill 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 22 of 27 <br />