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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 <br />Dublin CA, 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs corp <br />Reported <br />19 -Apr -00 1141 <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD13012 - EPA 5030B [PIT] <br />LCS (OD13012-BS2) <br />Prepared & Analyzed <br />14 -Apr -00 <br />Methyl tert-butyl ether - <br />564 <br />20 <br />ug/l <br />500 <br />113 70-130 <br />Surrogate Dibromofluoromethane <br />530 <br />.500 <br />106 50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />470 <br />500 <br />940 50-150 <br />LCS (OD13012-BS3) <br />Prepared & Analyzed <br />19 -Apr -00 <br />Methyl tett-butvi ether <br />551 <br />20 <br />ug/i <br />500 <br />110 70-130 <br />Surrogate Dibromofluoromethane <br />510 <br />Soo <br />102 50-150 <br />Surrogate 12-Dichloroelhane-d4 <br />540 <br />500 <br />108 50-150 <br />Matrix Spike (OD13012-MSI) <br />Source <br />W004227-01 <br />Prepared & Analyzed <br />12 -Apr -00 <br />Methyl tent -butyl ether <br />484 <br />20 <br />ugll <br />500 ND <br />968 60-150 <br />Surrogate Dibromofluoromethane <br />520 <br />500 <br />104 50-150 <br />Surrogale 12-Dichloroethane-d4 <br />540 <br />500 <br />108 50-150 <br />Matrix Spike Dup (OD13012-MSDI) <br />Source <br />W004227-01 <br />Prepared & Analyzed <br />12 -Apr -00 <br />Methyl tert-butyl ether <br />540 <br />20 <br />ugfl <br />500 ND <br />108 60-150 109 25 <br />Surrogate Dibromofluoromethane <br />520 <br />500 <br />104 50-150 <br />Surrogate 12-Dichloroethaw-d4 <br />530 <br />500 <br />106 50-150 <br />Batch OD14016 - EPA 5030B [PIT] <br />Blank (OD14016-BLKI) <br />Prepared & Analyzed 14 -Apr -00 <br />tert-Butyl alcohol <br />ND <br />20 <br />mg/m3 Air <br />Methyl tent -butyl ether <br />ND <br />050 <br />" <br />Di -isopropyl ether <br />ND <br />050 <br />" <br />Ethyl tert-butyl ether <br />ND <br />050 <br />" <br />telt-Amyl methyl ether <br />ND <br />050 <br />Surrogate Dibromofluoromethane <br />530 <br />500 <br />106 50-150 <br />Surrogate 11-Drchloroethane-d4 <br />490 <br />500 <br />980 50-150 <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 its entirety. <br />Page 5 of 7 <br />-M <br />