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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> { <br /> Analytical www.sequoialabs.com <br /> Kleinfelder-Stockton Project: Da]Monte 5304393 <br /> 2825 East Myrtle Street Project Number: 12280 Reported: <br /> Stockton CA,95205 Project Manager: Tony Martin 04/28/03 18:36 <br /> GasolinelBTEXIOxygenates 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 3040355-.EPA 5030E [PIT] <br /> Matrix Spike Dup(3040355-MSDI) Source:5304393-01 Prepared&Analyzed: 04/21/03 <br /> Methyl Cert-butyl ether 0.0483 0.0050. mg/kg 0.0448 ND 108 60-140 1 25 <br /> Benzene 0.0316 0.0050 0.0272 ND 116 60-140 1 25 <br /> Toluene 0.165 0.0050 0.167 Nil 99 60-140 2 25 <br /> Gasoline(C6-C 10)- 2.15 1.0 2.20 ND 98 60-140 2 25 <br /> Surrogate:1,2-DCR=d4' 0.0498 0.0500- '100 60-140 <br /> Surrogate:Toluene-d8 0.0493 0.0500 99 60-140 <br /> Surrogate:4-BFB 0.0466 0.0500 93 60-140 <br /> ( uoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 6 of 7 <br />