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1 819 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95894 <br /> C4— ) (916)921-9600 <br /> qW Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> Geological Technics,Inc Project Cardoza S312120 <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 /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ' Batch 3120170-EPA 5030B IMeOH I <br /> Laboratory Control Sample(3120170-BSI) Prepared&Analyzed 12/14/03 <br /> Methyl ter/-butyl ether 00447 00050 mg/kg 00496 90 60-140 <br /> ' Benzene 00270 00050 00120 84 70-130 <br /> Toluene 0 180 00050 0 148 122 70-130 <br /> Gasoline Range Organics 223 1 0 220 101 70-130 <br /> Surrogate 12 DCA d4 00486 00500 97 60-140 <br /> Surrogate Toluene-d8 00548 00500 110 60-140 <br /> Surrogate 4-BF9 00510 00500 101 60-146 <br /> Laboratory Control Sample(3120170-BS2) Prepared&Analyzed 12/16/03 <br /> Methyl tert-butyl ether 00442 00050 mglkg 00496 89 60-140 <br /> Benzene 00271 00050 00120 85 70-130 <br /> Toluene 0160 00050 0148 108 70-130 <br /> ago ine Range Organics 201 1 0 2 20 91 70-130 <br /> ORMWSurrogate I 1-DCA-d4 0 0554 00300 111 60-140 <br /> Surrogate Toluene-0 00505 00300 101 60-140 <br /> Surrogate 4-BFB 0 0501 00500 100 60-140 <br /> Laboratory Control Sample(3120170-BS3) Prepared&Analyzed 12/17/03 <br /> Methyl tent-butyl ether 00467 00050 mg/kg 00496 - 94 60-140 <br /> ' Benzene 00284 00050 00120 89 70-130 <br /> Toluene 0 154 00050 0 148 104 70-130 <br /> Gasoline Range Organics 1 85 1 0 2 20 84 70 130 <br /> Surrogate 12 DC4-d4 0 0601 0 05(10 120 60-140 <br /> ' Surrogate Toluene-d8 00488 00500 98 60-140 <br /> Surrogate 4-BFB 00496 00500 99 60 140 <br /> Laboratory Coutrol Sample Dup(3120176-65131} Prepared&Analyzed 12/15/03 <br /> Methyl tert butyl ether 00431 00050 mg/kg 00496 87 60-140 4 25 <br /> Benzene 00262 00050 00320 82 70-130 3 25 <br /> Toluene 0 175 00050 0 148 118 70-130 3 25 <br /> Gasoline Range Organics 2 18 1 0 220 99 70-110 2 25 <br /> Surrogate 1 1-DCA-d4 00492 00500 98 60-140 <br /> Surrogate Toluene d8 0 0551 00500 110 60-140 <br /> Surrogate 4-.BFB 0 0512 0 0500 102 60 140 <br /> Sequoia Analytical- Sacramento The results in thus 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 22 of 25 <br />