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819 Straker Ave Ste 8 <br /> Sequoia Sacramento CA 95814 <br /> (916)921 9600 <br /> FAX 0100 <br /> Analytical wwseq 6)92 scorn <br /> J www sequoialabs corn <br /> Geological Technics,Inc Project Cardoza 5312120 <br /> 1101 7th Street Project Number 662 2 Reported <br /> ' Modesto CA,95354 Project Manager Joseph Angulo 01/23/04 17 37 <br /> GasollnelBTEXIOxygenates by EPA method 8260B- Quality Control <br /> ' Sequoia Analytical - Sacramento <br /> Repur tng Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ' Batch 3120228-EPA 5030B [PIT] <br /> Laboratory Control Sample Dup(3120228-BSD1) Prepared&Analyzed 12/16/03 <br /> Methyl tert-butyl ether 206 050 ug!] 200 103 60-140 3 25 <br /> ' Benzene 192 050 i 200 96 70-130 2 25 <br /> Toluene 203 050 200 102 70-110 0 5 25 <br /> .Surrogate Toluene-d8 254 25 0 102 60-140 <br /> ' Surrogate 4-BFB 242 250 97 60-140 <br /> Surrogate 1 2-DCA-d4 258 250 103 60-140 <br /> I <br /> I <br /> I <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples anaty.ed 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 24 of 25 <br />