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Sequoia <br />CA 404 N Lane <br />Walnut Creek CA 94598 <br />4 a) <br />(925) 988-9600 <br />�„� Analytical <br />FAX equ alabsc73 <br />WWW sequoialabs co <br />Blank (OG20015-BLK2) <br />Gettler Ryan, Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J ProlectNumber Chevron 119-5775 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 Creek <br />Reporting Spike Source %REC RPD <br />lnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OG20015 - EPA 5030B [PIT] <br />Blank (OG20015-BLK2) <br />Prepared & Analyzed 21 -Jul -00 <br />tert-Butyl alcohol <br />ND <br />100 <br />ug/l <br />Methyl tent -butyl ether <br />ND <br />20 <br />" <br />Di-tsopropvl ether <br />ND <br />20 <br />Ethyl tent -butyl ether <br />ND <br />20 <br />tert-Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate Dibromofluoromelhane <br />530 <br />500 <br />106 50-150 <br />Surrogate 1 2-Drchloroethane-d4 <br />530 <br />500 <br />106 50-150 <br />LCS (OG20015-BSI) <br />Prepared & Analyzed <br />19 -Jul -00 <br />Methyl tert butyl ether <br />565 <br />20 <br />ugll <br />500 <br />113 70-130 <br />Surrogate Dibromofluoromethane <br />540 <br />500 <br />108 50-150 <br />Surrogate 1 1 Dichloroethane-d4 <br />530 <br />500 <br />106 50-150 <br />LCS (OG20015-BS2) <br />Prepared & Analyzed <br />21 -Jul -00 <br />Methyl tert-butyl ether <br />479 <br />20 <br />ug/l <br />500 <br />95 S 70-130 <br />Surrogate Dibromofluoromethane <br />530 <br />500 <br />106 50-150 <br />Surrogate 1 2-Dtchloroethane-d4 <br />510 <br />500 <br />101 50-150 <br />Matrix Spike (OG20015-MSI) <br />Source W007315-02 <br />Prepared & Analyzed <br />19 -Jul -00 <br />Methyl tert-butyl ether <br />602 <br />20 <br />ugil <br />500 ND <br />120 60-150 <br />Surrogate Dibromofluoromethane <br />540 <br />500 <br />108 50-150 <br />Surrogate 12-Dtchloroeihane-d4 <br />S20 <br />Soo <br />104 50-150 <br />Matrix Spike Dup (OG20015-MSD1) <br />Source W007315-02 <br />Prepared & Analyzed <br />19 -Jul -00 <br />Methyl tert-butyl ether <br />594 <br />20 <br />ug/I <br />500 ND <br />119 60-150 134 25 <br />Surrogate Drbromofluoromeihane <br />520 <br />500 <br />104 50-150 <br />Surrogate I 1-Dichloroethane-d4 <br />540 <br />500 <br />108 50-150 <br />Amok <br />Sequoia Analytical - Walnut Creek The results in lits report apply to the samples analyzed in accordance with the chain o <br />custody document This analytical report must be reproduced in its entirety <br />Page 10 of 11 <br />