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� Sequoia <br />� Analytical <br />404 N Wiget Lane <br />Walnut Creek, CA 94598 <br />{925} 988-9600 <br />FAX (925) 988-9673 <br />tiler Ryan, Inc - Dublin <br />Project Chevron <br />6747 Sierra Court Suite J <br />Project Number Chevron # 9-5775 <br />Reported <br />Dublin CA, 94568 <br />Project Manager Barbara Siemmski <br />10 -Jan -00 08 15 <br />MTBE Confirmation by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source <br />%REC <br />RPD <br />Analyte <br />Result Limit Units Level Result <br />%REC <br />Limits <br />RPD Limit Notes <br />Batch 9L28013 Prepared 03 -Jan -00 Using EPA 5030E [P/TJ <br />Blank (9L28013-BLK3) <br />Methyl tent -butyl ether <br />ND 010 mg/kg <br />Surrogate Dibromofluoromethane <br />265 250 <br />106 <br />50-150 <br />Surrogate 12 Dichloroethane-d4 <br />280 250 <br />111 <br />50-150 <br />LCS (9L28013-BS3) <br />Methyl tert-butyl ether <br />269 010 mg/kg 250 <br />108 <br />70-130 <br />Surrogate Dibromofluoromethaue <br />260 250 <br />104 <br />50-150 <br />Surrogate 12 Dichloroethane-d4 <br />270 250 <br />108 <br />50-150 <br />• <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in 113 enhrety <br />mp, La ratory Director Page 3 of 4 <br />