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Sequoia <br />� Analytical <br />Gettler Rvan Inc -Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Clievron # 9-5775 <br />Dublin CA 94568 Project Manager Scott Polston <br />Volatile Organic Compounds by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creep <br />404 N WigetLane <br />Walnut Creek CA 94598 <br />1925) 988-9600 <br />FAX 1925) 988-9673 <br />www sequotalabs tom <br />Reported <br />07 -Jun -00 10 12 <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC limits RPD Limit Notes <br />Batch OF06012 - EPA 5030B [PIT] <br />Blank (OFI)6012-BLKI) <br />Prepared & Analyzed 05 -Jun -00 <br />tert-Butvl alcohol <br />ND <br />100 ural <br />Methyl tert but-, l ether <br />ND <br />20 <br />Di isopropyl ether <br />ND <br />20 <br />Ethyl ten -butyl ether <br />ND <br />20 <br />ten Arnyl methyl ether <br />ND <br />20 " <br />Surrogate Dibromolluoromethane <br />490 <br />500 980 50-150 <br />Surrogate 1 2-Drchloroelhane-d4 <br />450 <br />500 900 50-150 <br />LCS (OF06012-BSI) <br />Prepared & Analyzed 05 -Jun -00 <br />Methyl tert-butyl ether <br />566 <br />20 ugA <br />500 113 70-130 <br />Surrogate Dibrornofluoromethaiie <br />490 <br />500 980 50-150 <br />Surrogate 12 Drchloroelhane-d4 <br />440 <br />500 880 50.150 <br />kFatnx Spike (OF06012-MSI) <br />Source W00571642 <br />Prepared & Analyzed 05 -Jun -00 <br />cert -butyl ether 599 20 ugfl 500 NO 120 60- I M <br />Surrogate Dibromofluoromedume 510 " 500 101 50-150 <br />Surrogate 1 1-Dtehloroerhane-d4 470 " 500 940 50-150 <br />Matrix Spike Dup (OF06012-MSDI) Source W00571642 Prepared & Analyzed 05 -Jun -00 <br />Diethyl tett4x"l ether 605 20 ugA 500 ND 121 60-150 0 997 25 <br />Swrogast DibnomoRuoromedmw 510 Soo 101 so -ISO <br />Surrogate 11-Drehloroet um -til 470 500 940 50.150 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzed in accordance with the charm of <br />0 custody document This analytical report must be reproduced in its entirety <br />Page 5 of 6 <br />