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Sequoia <br />Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925)988-96000 <br />FAX (925) 988-9673 <br />www sequolalabsAffi <br />Gettler Rydn, Inc, - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Scott Polstoti 24 -Jul -00 11 33 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creep <br />Reporting Spike Source %REC RPD <br />1 nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OGI0007 - EPA 5030E [P/TJ <br />LCS (OG10007-BS2) <br />Prepared & Analyzed 11 -Jul -00 <br />Methyl ten -butyl ether <br />444 <br />20 <br />ug/1 <br />500 <br />888 <br />70-130 <br />Surrogate Dibromofluoromeihane <br />490 <br />Soo <br />980 <br />50-150 <br />Surrogate 12 Dichloroeihane-d4 <br />430 <br />500 <br />860 <br />50-150 <br />Matrix Spike (OG10007-MSI) <br />Source W007026-02 <br />Prepared & Analyzed <br />10 -Jul -00 <br />Methyl ten -butyl ether <br />485 <br />20 <br />ug/l <br />500 ND <br />970 <br />60-150 <br />Surrogate Dibromofluoromeihane <br />450 <br />500 <br />900 <br />50-150 <br />Surrogate 12 Drchloroelhane-d4 <br />350 <br />500 <br />700 <br />50-150 <br />Matrix Spike Dup (OG10007-MSD1) <br />Source W007026-02 <br />Prepared 10 -Jul -00 Analyzed <br />11 -Tut -00 <br />Methvl tert-butyl ether <br />489 <br />20 <br />ugll <br />500 ND <br />978 <br />60-150 0 821 25 <br />Surrogate Dibromofluoromethane <br />460 <br />500 <br />920 <br />50-150 <br />Surrogate 12 Dtchloroethane-d4 <br />370 <br />500 <br />740 <br />50-150 <br />Batch OG11015 - EPA 5030B [PIT] <br />Blank (OG1 101 5-BLKI) <br />Prepared & Analyzed 11 -Jul -00 <br />tert-Butyl alcohol <br />ND <br />20 <br />mg1rW Atr <br />Methyl tert-butyl ether <br />ND <br />050 <br />" <br />Di -isopropyl ether <br />ND <br />050 <br />" <br />Ethyl tent -butyl ether <br />ND <br />050 <br />tert-Amyl methyl ether <br />ND <br />050 <br />Surrogate Dibromofluoromethane <br />500 <br />" <br />500 <br />100 <br />50-150 <br />Surrogate 12 Drchloroethane-d4 <br />450 <br />500 <br />900 <br />50-150 <br />LCS (OG11015-BSI) <br />Prepared & Analyzed <br />I I Jul -00 <br />Methyl Cert -butyl ether <br />444 <br />0 50 <br />mg/ml Air <br />500 <br />888 <br />70-130 <br />Surrogate Dibromofluoromethane <br />490 <br />500 <br />980 <br />50-150 <br />Surrogate 12 Dichloroelhane-d4 <br />430 <br />500 <br />860 <br />50-150 <br />Sequoia Analytical - Walnut Creek <br />The results in ihts report apply to the samples analyzed in accordance with the <br />custody document This analytical report must be reproduced in its <br />Page 12 of 15 <br />