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QUALITY CONTROL DEFINITIONS <br /> METHOD BLANK RESULTS: A method blank (MB) is a laboratory generated sample free <br /> of any contamination. The method blank assesses the degree to which the <br /> laboratory operations and procedures cause false-positive analytical results for <br /> your samples. <br /> LABORATORY CONTROL SPIKES <br /> The LCS Program: <br /> The laboratory control spike is a well-characterized matrix (organic pure <br /> type II water for water samples and contamination-free sand for soil <br /> samples) which is spiked with certain target parameters, and analyzed at <br /> approximately 5% of the sample load, in order to assure the accuracy and <br /> precision of the analytical method. <br /> Control limits for accuracy and precision are different for different <br /> methods and may vary with the different sample matrices. They are based <br /> on laboratory average historical data and EPA limits which are approved by <br /> the Quality Assurance Department. <br /> ( ) <br /> MBT Environmental '" Master Builders Tecrro:cues <br /> Laboratories <br />