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1 819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> ��,� (916)921 9600 <br /> Analytical FAX(916)9210100 <br /> WWW sequoialab5 cam <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 /> Gasoline\BTEXIOxygenates by EPA method 8260B-Quality Control <br /> ' Sequoia Analytical - Sacramento <br /> Reporting Spike Source °/oREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ' Batch 3120228-EPA 5030B IP/'Fl <br /> Blank(3120228-BLKI) Prepared&Analyzed 12/16/03 <br /> Tert-butyl alcohol ND 50 ugll <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 " <br /> ' Ten-amyl methyl ether ND 050 <br /> 1,2-Dibromoethane(ED8) ND 050 <br /> Benzene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics ND 50 " <br /> le Toluene-dR 268 250 107 60-140 <br /> WS1-01a1-91-te 4 BFB 241 " 250 96 60-140 <br /> Surrogate 12 DCA d4 279 " 25 0 112 60-140 <br /> ' Laboratory Control Sample(3120228-BSI) Prepared&Analyzed 12/16/03 <br /> Methyl tert-butyl ether 200 050 ugA 200 100 60-140 <br /> Benzene 195 050 200 98 70-130 <br /> Toluene 204 050 200 102 70-130 <br /> ' Surrogate Toluene-dS 102 100 102 60-140 <br /> Suri agate 4 BFB 9 40 100 94 60-140 <br /> Surrogate 12-DCA-d4 114 100 114 60-140 <br /> ' Laboratory Control Sample(3120228-BS2) Prepared&Analyzed 12/16/03 <br /> Methyl tert-butyl ether 5 21 0 50 ug/l 4 96 105 60-140 <br /> Benzene 2 93 0 50 320 92 70-130 <br /> ' Toluene 179 0 50 " 149 121 70-130 <br /> Gasoline Range Organics 206 50 220 94 70-130 <br /> Surrogate Toluene d8 25 9 11250 104 60-140 <br /> ' Surrogate 4-BF8 247 " 250 99 60-140 <br /> Surrogate 12 DCA d4 267 250 107 60-140 <br /> I <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 /> 1 <br /> Page 23 of 25 <br />