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819 Straker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-0100 <br /> Analytical <br /> FAX(916}921 4104 <br /> WWW sequoialaUs.com <br /> • <br /> ' Geological Technics,Inc Project Mares Property S412285 <br /> 1101 7th Street Project Number[none] Reported <br /> ' Modesto CA,95354 Project Manager Joseph Angulo 12/28/04 17 54 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B - Quality Control <br /> ' Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ' Batch 4120312-EPA 5030B [PIT /EPA 8260B <br /> Matrix Spike Dup(4120312-MSD1) Source 5412313-01 Prepared&Analyzed 12/22/04 <br /> Metbyl Cert-butyl ether 185 050 ugll 200 ND 92 60-140 4 25 <br /> ' Benzene 195 050 200 ND 98 70-130 4 25 <br /> Toluene 210 050 200 ND 105 70-130 9 25 <br /> Surrogate 12-DC�1 d4 847 100 85 60-140 <br /> Surrogate Toluene-d8 101 10 0 101 60-140 <br /> Surrogate 4-BFB 973 100 97 60-140 <br /> 1 <br /> 1 <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 to its entirety <br /> Page 15 of 16 <br />