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Sequoia <br />Analytical <br />404 N Wlget lane <br />Walnut Creek C4 94598 <br />(925)988-9600 <br />FAX (925) 988-9673 <br />wwwsequolalabs corn <br />er Rvan hic -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron #9-5775 Reported <br />Dublin CA, 94568 Project Manager Scott Polston 21 -Jun -00 1157 <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 OF15004 - EPA 5030B [PIT] <br />480 <br />500 <br />960 <br />Blank (OF15004-BLK3) <br />Surrogate 1 1-Dichloroelhone-d4 <br />470 <br />Prepared & Analyzed 20 -Jun -00 <br />tert-Butyl alcohol <br />ND <br />100 ug/l <br />Source W006209-01 <br />Methyl tent -butyl ether <br />ND <br />20 <br />Soo ND <br />Di -isopropyl ether <br />ND <br />20 <br />490 <br />Ethyl tert-btitvl ether <br />ND <br />20 <br />Surrogate 12 DichlorvedAww-d4 <br />tert-Amyl methyl ether <br />ND <br />20 " <br />50-150 <br />Surrogate Dibromofluoromerhane <br />510 <br />500 102 50-150 <br />Surrogate 1 2-Dichloroethatw-d4 <br />480 <br />500 960 50-150 <br />LCS (OF15004-BS3) <br />Prepared & Analyzed 20 -Jun -00 <br />Methyl tert-butyl ether <br />370 <br />20 ugll <br />500 740 70-130 <br />Surrogate Dtbromofluoromethane 480 500 960 50.150 <br />Surrogate 12 Dichloroethane-dr 450 500 900 50-150 <br />114111my Spike (OF15004-MSI) Source W006209-01 Prepared & Analyzed 15 -Jun -00 <br />ow tat -butyl ether 380 20 ug/l Soo ND 760 60-150 <br />Surrogate Dtbromofluoromethane <br />480 <br />500 <br />960 <br />SO -150 <br />Surrogate 1 1-Dichloroelhone-d4 <br />470 <br />500 <br />940 <br />so -Iso <br />Matrix Spike Dup (OF15004-MSDI) <br />Source W006209-01 <br />Prepared & Analyzed 15 -Jun -0O <br />Mathyl tet -butyl ether <br />430 20 ug/l <br />Soo ND <br />960 <br />60-150 113 25 <br />Sumtgare DibromoJluoromedww <br />490 <br />Soo <br />98.0 <br />50-150 <br />Surrogate 12 DichlorvedAww-d4 <br />490 <br />500 <br />9810 <br />50-150 <br />Sequoia Analvtical - Walnut Creek <br />0 <br />The results to this report apply to the samples analysed to accordance with the chain of <br />custody document This analytical report must be reproduced to as entirety <br />Page 5 of 6 <br />