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Sequoia <br />� Analytical <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925) 988-96W <br />FAX (925) 988-9673 <br />www sequowlabs corn <br />V47SierraCourt <br />an Inc - Dubhn Project Chevron <br />Suite J Project Number Chevron # 9-5775 Reported <br />Dublin CA 94568 Project Manager Stott Polston 09 -May -00 11 21 <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analvte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch OE05016 - EPA 5030B [PIT] <br />Blank (OE050I6-BLKI) Prepared k Analyzed 05 -May -00 <br />tort -Butyl alcohol ND 100 ugll <br />Methyl tert-butvl ether ND 20 <br />Dr -isopropyl ether ND 2 0 <br />Ethvi tert-butyl ether ND 20 <br />tert-Amyl mcthyl ether ND 2 0 <br />Surrogate Dibromofluoromethane 480 500 960 50-150 <br />Surrogate 12 Dichloroethane d4 480 500 960 50-150 <br />Blank (OE05016-BLK2) Prepared & Analyzed 08-Mav-00 <br />tert-Butyl alcohol <br />ND <br />100 ugil <br />Methyl tert-butyl ether <br />ND <br />20 <br />Di -isopropyl ether <br />ND <br />20 <br />Ethyl tert-butyl ether <br />ND <br />20 <br />lwyl methyl ether <br />ND <br />20 " <br />Sur ga a De D bromofluoromethare <br />500 <br />Soo <br />100 <br />50-150 <br />Surrogate 12 DrcNoroerhane-d4 <br />Soo <br />500 <br />100 <br />50-150 <br />LCS (OE05016-BSI) <br />Prepared & Analyzed 05 -May -00 <br />Methyl tet -butyl ether <br />592 20 ug/I <br />500 <br />118 <br />70-130 <br />Srvmgare Dibmmofluo►vmethatrs <br />500 <br />Soo <br />100 <br />50.150 <br />Swrogate 1 2-DOdoraedwie-d4 <br />480 <br />Soo <br />960 <br />50-150 <br />LCS (OE05016-B=) <br />Prepared & Analyzed 08 -May -00 <br />Mcthyi tut -butyl ether <br />584 20 ugll <br />500 <br />117 <br />70-130 <br />Surrogate Dibromofluoromethane <br />490 <br />500 <br />980 <br />50.130 <br />Surrogate 1 1-Drehloroethane-d4 <br />Soo <br />500 <br />100 <br />50-150 <br />Matrix Spike (OE05016-MSI) <br />Source W005093-01 <br />Prepared & Analyzed 05 -May -00 <br />Methyl ted-butvl ether <br />522 20 ug/l <br />500 <br />ND 104 <br />60-150 <br />Surrogate Drbromofluoromethane <br />490 <br />500 <br />980 <br />50-150 <br />Surrogate 1 2-Dichloroethane-d4 <br />480 <br />500 <br />960 <br />50-150 <br />Sequoia Analvacal - Walnut Creek The results in thit report apply to the samples analyzed in accordance with the chain of <br />custody document This analytical report must be reproduced in its entirety <br />i <br />Page 9 of 11 <br />.* <br />