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Sequoia <br />� Analytical <br />404 N Wiget Latte <br />Walnut Creek. CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequolalabs corn <br />settler Ryan, Inc -Dublin Project Chevron <br />6747 Sterna Court Suite J Project Number Chevron 49-5775 Reported <br />Dubhn 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 />Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OG20015 - EPA 5030B [PPT] <br />Blank (OG20015-BLK2) <br />Prepared & Analyzed 21 -Jul -0O <br />tert-Butv] alcohol <br />ND <br />100 <br />ug1l <br />Methvi tert-butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />" <br />Ethvl Cert -butyl ether <br />ND <br />20 <br />ten-Amvi methyl ether <br />ND <br />20 <br />Surrogate Dibromofluoromethane <br />530 <br />500 106 50-150 <br />Surrogate 12 Drchloroethane-d4 <br />530 <br />500 106 50-150 <br />LCS (OG20015-BSI) <br />Prepared & Analyzed 19 -Jul -00 <br />Methvi tent -butyl ether <br />563 <br />20 <br />ug/I <br />500 113 70-130 <br />Surrogate Dibromofluoromahane <br />540 <br />500 108 50-I50 <br />Surrogate 1 1-D+chloroethane-d4 <br />530 <br />500 106 50.150 <br />S (OG20015-BS2) <br />Prepared & Analyzed 21 -Jul -00 <br />Methyl tai -butyl ether <br />479 <br />20 <br />ugy <br />500 958 70-130 <br />Surrogate Dtbrornofluoromethane <br />S30 <br />Soo 106 50.150 <br />Surrogate 1 1-D+chloroethane-d4 <br />510 <br />500 102 50.150 <br />Matrix Spike (OG200I5-MSI) <br />Source W007315-02 <br />Prepared & Analyzed 19 -Jul -00 <br />Mdhvl tent -butyl ether <br />602 <br />20 <br />ug/1 <br />Soo ND 120 60-150 <br />Surrogate Drbromofluoromethane <br />540 <br />Sao 108 50150 <br />Surrogate 1 2 Drehloroedane-d4 <br />51.0 <br />500 104 50150 <br />Matrix Spice Dup (OG20015-MSD1) <br />Source WOMIS-02 <br />Prepared & Analyze& 19 -Jul -00 <br />Methyl tat -butyl ether <br />594 <br />20 <br />ug/1 <br />Soo ND 119 60-150 134 25 <br />Surrogate Drbromofhroronied—e <br />510 <br />50-0 104 50-150 <br />Smnate 12-Dtchloroed mw -d4 <br />540 <br />Soo los 50150 <br />Sequoia Analvtical - Walnut Creek The results in tins report apply to the samples analyzed to accordance with the chain of <br />0 custody document This analytical report must be reproduced in its entirety <br />Page 10 of 11 <br />L.M. <br />