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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron SS#J9-5775 <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 sequolalabs corn <br />Reported <br />25 -Apr -00 17 37 <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OD21021 - EPA 5030B [PITT <br />Blank (OD21021-BLKI) <br />Prepared & Analyzed 20 -Apr -00 <br />tent -Butyl alcohol <br />ND <br />100 <br />ug/t <br />Methyl tent -butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tent -butyl ether <br />ND <br />20 <br />Cert -Amyl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />440 <br />500 880 50-150 <br />Surrogate 1 1-Dichloroethane-d4 <br />390 <br />500 780 50-150 <br />Blank (OD21021-BLK2) <br />Prepared & Analyzed 21 -Apr -00 <br />tert-Butyl alcohol <br />ND <br />100 <br />ug/l <br />Methyl tert-butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tert butyl ether <br />ND <br />20 <br />" <br />tert-Amyl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />480 <br />Soo 960 50-150 <br />Surrogate 1 2-Dichioroethane-d4 <br />410 <br />500 820 50-150 <br />LCS (OD21021-BSI) <br />Prepared & Analyzed 20 -Apr -00 <br />Methyl tent -butyl ether <br />509 <br />20 <br />ug/l <br />500 102 70-130 <br />Surrogate Dibromofluoromethane <br />410 <br />Soo 840 50-150 <br />Surrogate 12-Dichloroethane-d4 <br />370 <br />Soo 740 50-150 <br />LCS (OD21021-BS2) <br />Prepared & Analyzed 21 -Apr -00 <br />Methyl tert-butyl. ether <br />600 <br />20 <br />ug4 <br />500 120 70-130 <br />Surrogate Dibromofluoromeihane <br />460 <br />500 910 50-150 <br />Surrogate 12-Dtchloroethane-d4 <br />400 <br />500 800 50-150 <br />Matrix Spike (OD21021-MSI) <br />Source W004314-01 <br />Prepared & Analyzed 20 -Apr -00 <br />Methyl tert-butyl ether <br />542 <br />20 <br />ug/1 <br />500 ND 108 60-150 <br />Surrogate Dibromofluoromethane <br />430 <br />500 860 50-150 <br />Surrogate 1 2-Dlchloroethane-d4 <br />390 <br />500 780 50-150 <br />Sequoia Analytical - Walnut Creek The resulli in this report apply to the samples analyzed in accordance with the chain of <br />custody document Tins analytical report must be reproduced in its entirely <br />Page 8 of 10 <br />