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4 t Sequoia <br />qQF Analytical <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (M) 988-9673 <br />www sequolalabs corn <br />Gettler Ryan, Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron #9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 26 -Jul -00 10 48 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creep <br />Reporting Spike Source %REC RPD <br />jAnalvte Result Limit Units Level Result %REC Linuts RPD Linut Notes <br />Batch OG19014 - EPA 5030B [PIT] <br />Blank (OG19014-BLKI) <br />Prepared & Analyzed 19 -Jul -00 <br />tert-Butyl alcohol <br />ND <br />20 mg/ml Air <br />Methyi tert-butyl ether <br />ND <br />050 " <br />Di isopropyl ether <br />ND <br />050 " <br />Ethyl tert-butyl ether <br />ND <br />050 <br />tent -Amyl methyl ether <br />ND <br />050 " <br />Surrogate Dibromofluoromethane <br />550 <br />500 110 50-150 <br />Surrogate 12-Drchloroeihane-d4 <br />530 <br />500 106 50-150 <br />LCS (OG19014-SSI) <br />Prepared & Analyzed 19 -Jul -00 <br />Methyl tert butyl ether <br />565 <br />0 50 mg/ml Air <br />500 113 70-130 <br />Surrogate Dihromofluoromethane <br />540 <br />500 108 50-150 <br />Surrogate 1 1-Dichloroelham-d4 <br />530 <br />500 106 50.150 <br />&CS Dup (OG19014-BSD1) <br />Prepared & Analyzed 19 -Jul -00 <br />Methyl tert-butyl ether <br />549 <br />0 50 mg/ml Air <br />500 110 70-130 287 25 <br />Surrogate Dibromofluoromelhane <br />540 <br />500 108 50-150 <br />Surrogate 12 Dichloroethane-d4 <br />520 <br />500 104 50-150 <br />Batch OG20015 - EPA 5030B [PIT] <br />Blank (OG20015-BLKI) <br />Prepared & Analyzed 19 -Jul -00 <br />tert Butyl alcohol <br />ND <br />100 ugll <br />Methyl ten butyi ether <br />ND <br />20 " <br />Di -isopropyl ether <br />ND <br />20 " <br />Ethyl tert-butyl ether <br />ND <br />20 <br />tert-Amyl methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />550 <br />500 110 50.150 <br />Surrogate 1 2-Dichloroethane-d4 <br />530 <br />500 106 50-150 <br />0 equoia 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 as entirety <br />Page 9 of 1t <br />