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Pace Analytical Services,Inc <br /> 900 Geminf Avenue <br /> ;acuumalwa/- Houston, 4X77050 <br /> Phanue 281488 1810 <br /> wwry pacelabs com far 281488 4661 <br /> QUALITY CONTROL DATA <br /> Lab Project Number 8528935 <br /> Client Project ID Site# 11191 <br /> MATRIX SPIRE & MATRIX SPIKE DUPLICATE 851764741 851764742 <br /> 851764038 Spike MS MSD MS MSD <br /> PArameter Units Rgg3ilt ` Conc Result Result % Rec % Rec RPD Footnotes <br /> Benzene ug/1 0 50 00 58 98 60 65 118 121 3 <br /> Toluene ug/1 0 50 00 76 88 62 74 154 126 20 <br /> Methyl-tert-butyl ether ug/l 9334 50 00 4187 4331 0 0 3 <br /> Toluene-d8 (S) 80 83 <br /> 4-Bromofluorobenzene (S) 88 90 <br /> 1,2-Dichloroethane-d4 (S) 101 106 <br /> Comments Due to high analyte concentration the matrix spike and/or matrix spike duplicate do not provide reliable k <br /> Recovery and RPD values Sample results for this QC batch were accepted based on LCS/LCSD Recovery and/or RPD <br /> values <br /> i <br /> Date 08/19/02 Page 8 <br /> REPORT OF LABORATORY ANALYSIS <br /> This report shall not be reproduced except in Tull <br /> without the written consent of Pace Analytical Services Inc <br />