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Excelchem Environmental Labs <br /> Geological Technics Project: VALENTINES <br /> 1101 7th Street Project Number: 723.2 Date Reported: <br /> Modesto,CA 95354 Project Manager: Geological Technics 06/08/07 12:46. <br /> Oxygenates-Quality Control <br /> Re rtin Spik gource °/°RI;C R1'D <br /> Analyte Result pg imJ� Units Level Result %REC Limits RPD Limit Notes <br /> Batch AQF0018-EPA 8260B <br /> LCS Dup(AQF0018-BSD1) Prepared&Analyzed:06/05/07 <br /> Surrogate:Dibromofluoromethane 10.4 ug/1 12.5 83.2 70-130 <br /> Surrogate: Toluene-d8 11.6 12.5 92.8 70-130 <br /> Surrogate:4-Bromofluorobenzene 12.6 12.5 101 70-130 <br /> Benzene 9.0 0.5 mg/m3 Air 10.0 90.0 20-120 1.10 15 <br /> Toluene 8.4 0.5 10.0 84.0 20-120 0.00 15 <br /> 1,1-Diehl oroethene 10.9 0.5, 10.0 .109 20-120 0.922 15 <br /> Trichloroethene 9.2 0.5 10.0 92.0 20-120 0.00 15 <br /> Chlorobenzene 8.2 0.5 10.0 82.0 20-120 1.23 15 <br /> EXcelchem Environmental Lab. 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 /> I <br /> i <br /> Laboratory Representative Page of <br />