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Stri <br /> Ave Ste 8 <br /> Sequoia Saclramentto rCA 95834 <br /> (916)921 9600 <br /> qw 19 1 <br /> Analytical FAX(916)9210100 <br /> www sequoialabs com <br /> Geological Technics,Inc Project Cardoza S312120 <br /> 1 101 7th Street Project Number 662 2 Reported <br /> ' Modesto CA,95354 Project Manager Joseph Angulo 01/23/04 17 37 <br /> GasolineWEXl4xygenates by EPA method 8260B -Quality Control <br /> ' Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limns RPD Limit Notes <br /> Batch 3120170-EPA 5030B ]MeOH] <br /> Blank(3120170-BLK3) Prepared 12/16/03 Analyzed 12/17/03 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 00050 <br /> Di-tsopropyl ether ND 00050 <br /> Ethyl tert-butyl ether ND 00050 " <br /> ' Tert-amyl methyl ether ND 0 0051) <br /> 1,2-Dtbromoethane(EDB) ND 00050 <br /> Benzene ND 00050 <br /> Ethylbenzene ND 00050 " <br /> Toluene ND 00050 ; <br /> Xylenes(total) ND 0 010 <br /> Gasoline Range Organics ND 1 0 <br /> Wrrogate 1 2-DCA-d4 00619 " 00500 124 60 140 <br /> rrogate Toluene d8 00468 00500 94 60-140 <br /> Sun ogate 4-BFB 0 0510 00500 102 6()-140 <br /> Blank(3120170-BLK4) Prepared&Analyzed 12/17/03 <br /> Tert butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 <br /> 1 Ethyl tert butyl ether ND 00050 '1 <br /> Tert-amyl methyl ether ND 00050 <br /> 1,2-Dtbromoethane(EDB) ND 00050 " <br /> Benzene ND 00050 <br /> Ethylbenzene ND 00050 <br /> Toluene ND 00050 <br /> Xylenes(total) ND 0 010 " <br /> ' Gasoline Range Organics ND 1 0 <br /> Surrogate 1 2-DCA-d4 00590 0 0500 118 60-140 <br /> Surrogate Toluene d8 00466 00500 93 60-140 <br /> ' Surrogate 4-BFB 00483 00500 97 60-140 <br /> 1 <br /> ' Sequoia Analytical -Sacramento The results to 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 21 of 25 <br />