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4 4 Sequoia <br />IwoAnalytical <br />404 N Wiget Lane <br />Walnut Geek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoialabs com <br />'. Wettler Ryan lite -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron 49-5775 Reported <br />Dutslm CA, 94568 Project Manager Scott Polston 21 -Jun -00 11 57 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />tnalyte Result Ltn t Units Level Result %REC Limits RPD Limit Notes <br />Batch OF15004 - EPA 5030E ]PIT] <br />Blank (OF15004-BLK3) <br />ND 760 <br />Prepared & Analyzed 20 -Jun -00 <br />Cert -Butyl alcohol <br />ND <br />100 ugll <br />Methyl tert-butvl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tent -butyl ether <br />ND <br />20 " <br />tert-Amyl methyl ether <br />ND <br />20 " <br />Surrogate Dibromofluommethane 510 Soo 102 50-150 <br />Surrogate 1 2-Drchloroethane-d4 480 500 960 50-150 <br />LCS (OF15004-BS3) Prepared & Analyzed 20 -Jun -00 <br />Methyl tent -butyl ether 370 20 ug/l 500 740 70 130 <br />Surrogate Dibromofluoromethane 480 500 960 50-150 <br />Surrogate 1 2-Dichloroethane d4 450 500 900 50-150 <br />lbtrix Spike (OF15004-MSI) Source W006209-01 Prepared & Analyzed 15 -Jun -00 <br />Wethyl Cert -butyl ether <br />Surrogate Drbromofluoromelhane <br />Surrogate 1 2Dichloroethane-d4 <br />Matrix Spike Dup (OF15004-MSDI) <br />Methyl tert-butyl ether <br />Surrogate Drbromofluoromethane <br />Surrogate 1 2-Dtchloroethane-d4 <br />Sequoia Analvticai - Walnut Creek <br />380 20 ug/1 <br />480 <br />470 <br />Source W006209-01 <br />430 20 ug/1 <br />490 <br />490 <br />500 <br />ND 760 <br />60450 <br />500 <br />960 <br />50-150 <br />500 <br />940 <br />50-150 <br />Prepared & Analyzed 15 -Jun -00 <br />500 <br />ND 860 <br />60-150 12 <br />500 <br />980 <br />50-150 <br />Soo <br />980 <br />50-150 <br />The results to this report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced to its entirety <br />Page 5 of 6 <br />