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QSequoia <br />� Analytical <br />1551 Industrial Road <br />San Carlos CA 94070-4111 <br />(650) 232-9600 <br />FAX (650) 232-9612 <br />www sequoialabs com <br />Gcttler-Ryan/Geostrateves(l) Project Chevron(1) Sampled 6/29/00 <br />6747 Sierra Court, Suite J Project Number Chevron 9-5775 Received 6/30/00 <br />Dublin, CA 94568 Project Manager Scott Polston Reported 7/5/00 <br />Volatile Organic Oxygenated Compounds by EPA Method 8260A/Quality Control <br />Sequoia Analytical - San Carlos - <br />Date Spike Sample QC Reporting Limit Recov RPD RPD <br />Anal a Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br />Batch 0070014 <br />Date Prepared 7/5/00 <br />Extraction Method EPA 5030B [P/TJ <br />Blank <br />0070014-BLKI <br />Ethanol <br />715/00 <br />ND <br />ug/l 1000 <br />Tert-butyl alcohol <br />ND <br />100 <br />Methyl tert-butyl ether <br />ND <br />200 <br />Di -isopropyl ether <br />ND <br />200 <br />Ethyl tert-butyl ether <br />ND <br />200 <br />Tert-amyl methyl ether <br />ND <br />200 <br />Surrogate 12-Dichloroethane-d4 <br />500 <br />519 <br />760-114 104 <br />LCS <br />0070014 -BSI <br />Methyl Cert -butyl ether <br />7/5/00 Soo <br />413 <br />ug/l 700-130 826 <br />Surrogate 12-Dichloroethane-d4 <br />11500 <br />522 <br />760-114 104 <br />• <br />Sequoia Analytical - San Carlos *Refer to end of report jar text of notes and definitt <br />Page 5 of 6 <br />