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404 N Wiget Lane , <br /> Sequoia Walnut Creek C 94598 <br /> (925)988 8-9600 <br /> FAX(925)988-9673 <br /> Analyticalwww sequoiafabs corn <br /> Gettler Ryan Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron 4 9-8632 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 16-Aug-01 08 08 <br /> MTBE Confirmation 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 1H07010- EPA 5030E(P/T) <br /> Blank(1H07010-BLK1) Prepared&Analyzed 07-Aug-OI <br /> Methyl tert-butyl ether(MTBE) ND 20 ug/1 <br /> Surrogate Dibromofluoromeihane 500 500 100 54-150 <br /> Surrogate 1,2-Dichloroethane-d4 480 500 960 50-150 <br /> Blank(IH07010-BLK2) Prepared&Analyzed 08-Aug-01 <br /> Methyl ter(-butyl ether(MTBE) ND 20 ug/l <br /> Surrogate Dibromofluoromethane 490 500 980 50-150 <br /> Surrogate 1 1-Dichloroelhane-d4 510 500 101 50-150 <br /> Blank(1H07010-BLK3) Prepared&Analyzed 10-Aug-01 <br /> Methyl tert-butyl ether(MTBE) ND 20 ug/l <br /> Surrogate Dibromofluoromethane 550 500 110 50-150 <br /> Surrogate I 1-Dichloroethane-d4 540 500 108 50-150 <br /> LCS(IH07010-BS1) Prepared&Analyzed 07-Aug-01 <br /> Methyl ten-butyl ether(MTBE) 53 1 20 ug/l 500 106 70-130 <br /> Surrogate Dibromofluoromethane 450 500 900 50-150 <br /> Surrogate 12-Diehloroethane-d4 470 500 940 50-150 <br /> LCS(1H07010-BS2) Prepared&Analyzed 08-Aug-01 <br /> Methyl tert-butyl ether(MTBE) 54 1 20 ug/1 500 108 70-130 <br /> Surrogate Dibromofluoromethane 430 500 860 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 480 500 960 50-150 <br /> LCS(1H07010-BS3) Prepared&Analyzed 10-Aug-01 <br /> Methyl un-butyl ether(MTBE) 521 20 ug/l 500 104 70-130 <br /> Surrogate Dibromofluoromethane 490 500 980 50-150 <br /> Surrogate 1 2-Dichloroelhane-i4 510 500 102 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the c <br /> custody document This analytical report must be reproduced in its e <br /> Page 11 of 14 <br />