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MATRIX SPIKE <br />QUALITY CONTROL REPORT <br />Analyzed By: G. Barrett <br />Method: 6010 <br />Sample Matrix: Soil <br />Twininq Laboratories. Inc. Examination Numharr R99nFFR9 1_9 <br />Reviewed By: F. Hoevertsz <br />Spiked Sample ID: 699-5581.1 <br />Constituent <br />Method Blank <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 />% Rec. <br />RPD <br />Cadmium (Cd) <br /><0.01 <br />ND <br />4 <br />3.69 <br />3.67 <br />92.3 <br />91.7 <br />0.65 <br />Chromium (Cr) <br /><0.05 <br />13.8 <br />20 <br />34.7 <br />34.4 <br />105 <br />103 <br />0.87 <br />Lead (Pb) <br /><0.05 <br />7.33 <br />20 <br />25.5 <br />26.7 <br />90.9 <br />96.9 <br />4.6 <br />Nickel (Ni) <br /><0.05 <br />14.9 <br />20 <br />33.2 <br />33.0 <br />91.5 <br />90.5 <br />0.60 <br />Zinc (Zn) <br /><0.05 <br />50.6 <br />20 <br />73.0 <br />74.6 <br />112 <br />120 <br />6.9 <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 />