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Sequoia <br />� Analytical <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />Gettler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron SS#9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polston 25 -Apr -00 17 37 <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 Limits RPD Limit Notes <br />Batch OD21021 - EPA 5030B [PIT] <br />Matrix Spike Dup (OD21021-MSDI) <br />Source W004314-01 <br />Prepared & Analyzed 20 -Apr -00 <br />Methyl ten -butyl ether <br />611 <br />20 <br />ug/i <br />500 ND 122 60-150 120 25 <br />Surrogate Dibromofluoromethane <br />460 <br />500 920 50-150 <br />Surrogate 12 Dichloroethane-d4 <br />440 <br />500 880 50-150 <br />Batch OD24015 - EPA 5030B [P/TJ <br />Blank (OD24015-BLKI) <br />Prepared & Analyzed 21 -Apr -00 <br />tert-Butyl alcohol <br />ND <br />20 <br />mg/ml Air <br />Methyl tert-butyl ether <br />ND <br />0 50 <br />" <br />Di -isopropyl ether <br />ND <br />0 50 <br />Ethyl tett-butyl ether <br />ND <br />0 50 <br />" <br />tert-Amyl methyl ether <br />ND <br />0 50 <br />urrogate Dibromofluorome[hane <br />480 <br />Soo 960 50-150 <br />Wrogate 1 2-Dichloroethane-d4 <br />370 <br />500 740 50-150 <br />LCS (OD24015-BSI) <br />Prepared & Analyzed 21 -Apr -00 <br />Methyl tent -butyl ether <br />550 <br />0 50 <br />mg/ml Air <br />500 110 70-130 <br />Surrogate Drbromofluoromethane <br />49 D <br />SD 0 980 50-150 <br />Surrogate 1 2-Drchloroethane-d4 <br />450 <br />Soo 900 50-150 <br />LCS Dup (OD24015-BSDI) <br />Prepared & Analyzed 21 -Apr -00 <br />Methyl tert-butyl ether <br />447 <br />0 50 <br />mWrrO Air <br />500 894 70-130 207 25 <br />Surrogate Dibromofluoromethime <br />530 <br />500 106 50-150 <br />Surrogate 1 2-Dichloroe[hane-d4 <br />510 <br />Soo 102 50-150 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance wah the chain of <br />• custody document This analytical report must be reproduced in its entirety <br />Page 9 of 10 <br />t'*. <br />