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i <br />S e O l a <br />819 Striker Avenue, Suite <br />Sacramento, CA 95837r - <br />q11 <br />(1a) 916) 921-9600 <br />Analytical <br />FAX (916) 921-010^ i <br />,n„ w,sequolalabs.cor� <br />_ <br />Gasoline\BTEX\Oxygenates by EPA method 8260B - Quality Control <br />J <br />Sequoia Analytical - Sacramento <br />J <br />Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. Unless otherwise stated, results are reported on a wet weight basis. <br />Reporting <br />Spike Source <br />%REC RPD <br />Page 12 of 19 <br />Analyte <br />Result <br />Limit <br />Units Level Result <br />%REC <br />Limits RPD Limit <br />Notes <br />Batch 3100072 - EPA 5030B [P/T] <br />J <br />Blank (3100072-BLKI) <br />Prepared & Analyzed: 10/02/03 <br />Ethanol <br />ND <br />0.20 <br />mg/kg <br />Tert-butyl alcohol <br />ND <br />0.050 <br />Methyl tert-butyl ether <br />ND <br />0.0050 <br />-� <br />Di -isopropyl ether <br />ND <br />0.0050 <br />Ethyl tert-butyl ether <br />ND <br />0.0050 <br />i <br />Tert-amyl methyl ether <br />ND <br />0.0050 <br />1,2-Dichloroethang <br />ND <br />0.0050 <br />" <br />1,2-Dibromoethane (EDE) <br />ND <br />0.0050 <br />Benzene <br />ND <br />0.0050 <br />" <br />Ethylbenzene , <br />ND <br />0.0050 <br />" <br />Toluene <br />ND <br />0.0050 <br />" <br />Xylenes (total) <br />ND <br />0.010 <br />Gasoline (C6 -C10) <br />ND <br />1.0 <br />Surrogate: 1,2 -DCA -d4 <br />0.0576 <br />0.0500 <br />115 <br />60-140 <br />Surrogate: Toluene -d8 <br />0.0619 <br />0.0500 <br />124 <br />60-140 <br />Surrogate: 4 -BFB <br />0.0569 <br />0.0500 <br />114 <br />60-140 <br />Laboratory Control Sample (3100072 -BSI) <br />Prepared & Analyzed: 10/02/03 <br />Methyl cert -butyl ether <br />0.0358 <br />0.0050 <br />mg/kg 0.0496 <br />72 <br />60-140 <br />Benzene <br />0.0255 <br />0.0050 <br />0.0320 <br />80 <br />70-130 <br />Toluene <br />0.177 <br />0.0050 <br />0.148 <br />120 <br />70-130 <br />Gasoline (C6 -C10) <br />2.04 <br />1.0 <br />2.20 <br />93 <br />70-130 <br />Surrogate: 1,2 -DCA -d4 <br />0.0570 <br />0.0500 <br />114 <br />60-140 <br />J <br />Surrogate: Toluene -d8 <br />0.0627 <br />0.0500 <br />125 <br />60-140 <br />Surrogate: 4 -BFB <br />0.0555 <br />0.0500 <br />111 . <br />60-140 <br />J <br />J <br />J <br />Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. Unless otherwise stated, results are reported on a wet weight basis. <br />This analytical report must be reproduced in its entirety. <br />Page 12 of 19 <br />