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Sequoia <br />� Analytical <br />Gettler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Sutte J PrglectNumber Farmer Chevron #9-5775 <br />Dublin CA, 94568 Protect Manager Steve Carter <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wlget Lane <br />Walnut Creek CA 94598 <br />(925)988-9600 <br />FAX (9z5) 988-9673 <br />Reported <br />03 -Mar -00 1141 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 0003007. Prepared 02 -Mar -00 <br />Using EPA 5030B [PIT] <br />Blank (0003007-BLKI) <br />tert-Butyl alcohol <br />ND <br />100 <br />ug/1 <br />Methyl tert-butyl ether <br />ND <br />20 <br />" <br />Ds isopropyl ether <br />ND <br />20 <br />" <br />Ethyl tert-butyl ether <br />ND <br />20 <br />" <br />tort -Amyl methyl ether <br />ND <br />20 <br />" <br />Surrogate Dibromofluoromethane <br />490 <br />Soo <br />980 <br />50-150 <br />Surrogate 1,1-Dichloroelhane-d4 <br />500 <br />500 <br />100 <br />50-150 <br />LCS (0003007 -BSI) <br />Methyl tert-butyl ether <br />483 <br />20 <br />ug/I <br />500 <br />966 <br />70 130 <br />Surrogate Dtbromofluoromethane <br />Soo <br />" <br />500 <br />100 <br />50-150 <br />0 -gate 1 2-Dwhloroethane-d4 <br />530 <br />500 <br />106 <br />50-150 <br />Matrix Spike (0003007 -MSI) <br />Source W003044-04 <br />Methyl tert--butyl ether <br />445 <br />20 <br />ug/I <br />500 <br />9 1 828 <br />60-150 <br />Surrogate Dtbromofluoromethane <br />500 <br />Soo <br />100 <br />50-150 <br />Surrogate 1 1-Dichloroeihane-d4 <br />540 <br />500 <br />108 <br />50-150 <br />Matrix Spike Dup (0003007-MSD1) <br />Source W003044-04 <br />Methyl tert-butyl ether <br />524 <br />20 <br />ug/l <br />500 <br />3 1 986 <br />60-150 163 25 <br />Surrogate Dtbromafluoromethane <br />Soo <br />500 <br />100 <br />50-150 <br />Surrogate 1 2-Drchloroetham-d4 <br />540 <br />500 <br />108 <br />50-150 <br />et;ttoia Analytical - Walnut Creek The results tit this report apply to the sarnples analyzed i n accord mce with the thorn of <br />custody document This analytical report must be reproduced to in entirely <br />;"4aAne&mp,Cat;r-a)tory Dirc for <br />Page 5 of 6 <br />