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4 MATRIX SPIKE <br />QUALITY CONTROL REPORT <br />Analyzed By: G. Barrett <br />Method: 6010 <br />Sample Matrix: Soil <br />TXA/ininn 1 ahnratnrias. Inr._ Fxaminatinn Numher: 69905996.1-5 <br />Reviewed By: F. Hoevertsz <br />Spiked Sample ID: 69905946.2 <br />Constituent <br />Method <br />Result <br />Sample <br />Result <br />Spike <br />Level <br />MS <br />Result <br />MSD <br />Result <br />MS % <br />Rec. <br />MSD <br />% <br />Rec. <br />RPD <br />Cadmium (Cd) <br /><0.001 <br />NO <br />4 <br />3.67 <br />3.64 <br />91.7 <br />91.0 <br />0.82 <br />Chromium (Cr) <br /><0.050 <br />11 <br />20 <br />29.4 <br />29.9 <br />92.0 <br />94.5 <br />1.7 <br />Lead (Pb) <br /><0.05 <br />48.1 <br />20 <br />69.9 <br />73.1 <br />109 <br />125 <br />4.5 <br />Nickel (Ni) <br /><0.05 <br />6.4 <br />20 <br />23.9 <br />24.2 <br />87.5 <br />89.0 <br />1.2 <br />Zinc (Zn) <br /><0.05 <br />62.1 <br />20 <br />76.6 <br />82.3 <br />72.5• <br />101 <br />7.2 <br />EXPLANATIONS: <br />Method Blank: The method blank is used to determine if method analytes or other interferences are present in the <br />laboratory environment, the reagents or apparatus. <br />All concentrations in mg/Kg: Milligrams per kilogram (ppm) <br />Matrix Spike and <br />Matrix Spike Duplicate: A matrix spike is a sample to which a known amount of analyte has been added. The <br />percent recovery and the relative percent difference are assessed to determine the <br />accuracy and precision of the analytical procedure. <br />'POSSIBLE MATRIX EFFECTS <br />Rev. 3 05/97 IOC.WKSI <br />