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1885 Jarvis Drive <br /> a_ _� Sequoia MorganHiI1,CA95037 <br /> (408)776.9600 <br /> Analytical FAX(408)792.6308 <br /> • www.soquoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOUD-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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5G25006-EPA 5030E PIT 1 EPA 8260B <br /> Blank(5G25006-BLKI) Prepared&Analyzed:07/25/05 <br /> tent-Amyl methyl ether ND 0.50 ugll <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 Cert-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:1,2-Dichloroethane-d4 1.30 1.50 91 60-135 <br /> Blank(5G25006-BLK2) Prepared&Analyzed:07_/2.5/0_5 <br /> tert-Amyl methyl ether ND 0.50 ugll <br /> Benzene ND 0.50 " <br /> cert-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 cert-butyl ether ND 0,50 " <br /> Ethylbenzenc ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) 0.590 0.50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> SwTogate:l,2-Drchloroethane-d4 1.08 1.50 83 60-135 <br /> Sequoia Analytical-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 14 of 27 <br />