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404 N Wiget Lane U <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> q,F Analytical www (9Z5)988-9673 <br /> ww sequaialabs corn <br /> Gettler Ryan, Inc -Dublin Project Chevron <br /> -6747-Sierra Court-Suite J Project Number—Chevron#-9-6171 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 31-Jul-01 07 59 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1G23002-EPA 5030B(P/T) - - - - - -V- - <br /> Blank(IG23002-BLK1) Prepared&Analyzed 23-Jul-01 <br /> Ethanol ND 500 ug/1 <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromide ND 20 " <br /> Surrogate Dibromofluoromethane 493 Soo 986 50-150 <br /> Surrogate 12-Diehloroethane-d4 50 7 500 101 50-150 <br /> Blank(1G23002-BLK2) v Prepared&Analyzed 25-Jul-01 <br /> Ethanol _ ND 500 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl ten-butyl ether ND 20 " <br /> DI-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether = - - - -ND = 20 - _ - <br /> tert-Amyl methyl ether ND 20 " <br />- 1,2-Dichloroethane ND _ - 20 <br /> Ethylene dibromide ND 20 " <br /> Surrogate Dibromofluoromethane 452 500 904 50-150 <br /> Surrogate 1,2-Dichloroethane-&4 452 500 904 50-150 <br /> LCS(1G23002-SSI) Prepared&Analyzed 23-Jul-01 <br /> Methyl cert-butyl ether 472 20 ug/l 500 944 70-130 <br /> Surrogate Dibromofluoromethane 498 500 996 50-150 <br /> Surrogate 1,2-Dichlaroethane-d4 486 500 972 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed to accordance with the Vt 'custody document This analytical report must be reproduced in its <br /> Page 15 of 18 <br /> t� <br />