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Sequoia <br />� Analytical <br />Gettler Ryan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron 4 9-5775 <br />Dublin CA 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wiget Lane <br />Walnut Creek CA 94598 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />www sequoualabs com <br />Reported <br />07 -Jun -00 10 12 <br />Reporting Spike Source %REC RPD <br />lnalyte Result Limit Units Level Resutt %REC Limits RPD Limit Notes <br />Batch OF06012 - EPA 5030B [P/TJ <br />ND 120 <br />60-150 <br />.500 <br />Blank (OFI)6012-BLKI) <br />50-150 <br />500 <br />Prepared & Analyzed 05 -Jun -00 <br />tert-Butyl alcohol <br />TVD <br />100 ugfl <br />ND t21 <br />Methyl tent but,.l ether <br />ND <br />20 <br />50-150 <br />Di iSopropyl ether <br />ND <br />20 " <br />Ethyl tert-butyl ether <br />TVD <br />20 <br />tert-Amyl methyl ether <br />ND <br />20 " <br />Surrogate Drbromo/luoromethane <br />490 <br />500 980 50-150 <br />Surrogale 12 Dtchloroethane-d4 <br />450 <br />Soo 900 50-150 <br />LCS (OF06012-BSI) <br />Prepared & Analyzed 05 -Jun -00 <br />Methyl tett butyl ether <br />566 <br />20 ug/I <br />500 113 70-130 <br />Surrogate Dibroenofluaromelhane 490 <br />Surrogate 1 2-Dichloroethane-d4 440 <br />ILtrix Spike (OF06012-MSI) Source W005716-42 <br />metnyi tert-atttyl ether <br />Surrogate Dibromofluoromethane <br />Surrogate 12-Dwhloroethane-d4 <br />Matrix Spike Dup (OF06012-MSDI) <br />Methyl tett-butyl ether <br />Surrogate Debromofluoromethane <br />Surrogate 1 1 Dichloroethane-d4 <br />599 20 ug/I <br />510 " <br />470 " <br />Source W00571642 <br />605 20 ugll <br />510 <br />470 <br />Soo 980 50-150 <br />500 880 50.150 <br />Prepared & Analyzed 05 -Jun -00 <br />500 <br />ND 120 <br />60-150 <br />.500 <br />101 <br />50-150 <br />500 <br />940 <br />50-150 <br />Prepared & Analyzed 05 -Jun -00 <br />500 <br />ND t21 <br />60-150 0 997 <br />500 <br />102 <br />50-150 <br />Soo <br />940 <br />50-150 <br />Sequoia Analytical - Walnut Creek The retults in this report apply to the samples analy.ed in accordance with the chain of <br />46 custody document This analytical report must be reproduced m its entirety <br />Page 5 of 6 <br />