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Sequoia <br />IwoAnalytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />tier Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite 1 Project Number Chevron 49-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 19 -Apr -00 1141 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limit, RPD Limit Notes <br />Batch 4ID13012 - EPA 5030E [PIT] <br />Blank (OD13012-BLK1) <br />ND <br />100 <br />Prepared & Analyzed 12 -Apr -00 <br />tert-Butt/ I alcohol <br />ND <br />100 <br />ugA <br />Methyl tzrt hutyl ether <br />ND <br />20 <br />Dt isopropvl ether <br />ND <br />20 <br />" <br />Ethyl tert butyl ether <br />ND <br />20 <br />ND <br />tert-Amyl methvl ether <br />ND <br />20 <br />Surrogate Dibromofluoromeihane <br />520 <br />20 <br />500 1044 50-150 <br />Surrogate 1 2-Dichloroethane d4 <br />520 <br />Surrogate Dibromoflrtoromerhaue <br />500 104 50-150 <br />Blank (0D13012-BLK2) <br />Soo <br />104 <br />Prepared & Analyzed 14 -Apr -00 <br />Cert -Butyl alcohol <br />ND <br />100 <br />ugll <br />Methyl Cert -butyl ether <br />ND <br />20 <br />DL -isopropyl ether <br />ND <br />20 <br />Methyl ten -butyl ether <br />tort -butyl ether <br />ND <br />20 <br />108 <br />yl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />S30 <br />50-150 <br />500 106 50-150 <br />Surrogate 11-Dtehloroethane-d4 <br />490 <br />500 <br />500 980 50-150 <br />Blank (OD13012-BLK3) <br />Prepared & Analyzed 19 -Apr -00 <br />ted -Butyl alcohol <br />ND <br />100 <br />ug/i <br />Methyl tert-butyl ether <br />ND <br />20 <br />" <br />Eh-tsopropyl ether <br />ND <br />20 <br />" <br />Ethyl telt butyl ether <br />ND <br />20 <br />" <br />tert-Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate Dibromoflrtoromerhaue <br />520 <br />Soo <br />104 <br />50-150 <br />Surrogate 1 1-Dichloroethane d4 <br />550 <br />" 500 <br />110 <br />50-150 <br />LCS (OD13012-BSI) <br />Prepared & Analyzed <br />12 -Apr -00 <br />Methyl ten -butyl ether <br />540 <br />20 <br />ug/1 500 <br />108 <br />70-130 <br />Surrogate Dibromofluorontethane <br />510 <br />SO 0 <br />102 <br />50-150 <br />Surrogate 12-Dichloroethane d4 <br />500 <br />500 <br />100 <br />50-150 <br />Sequoia Analvtical - Walnut Creek The results tit this report apply to the samples analyzed tit accordance with the chain of <br />0 custody document This analytical report must be reproduced in its erturety <br />Page 4 of 7 <br />N <br />