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1 <br /> 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 in <br />' duplicate at approximately 5% of the sample load, in order to assure the <br /> h accuracy and 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 /> 1 <br /> 1 <br />' (DC5-CN7639A) <br /> MBT Environmental <br /> Laboratories <br /> �G <br />