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August 7, 2014 Lab ID : STK1436972 <br />Forward Inc. Customer : 3-8692 <br />Quality Control - Inorganic <br />Definition <br />Blank <br />: Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />RgBlk <br />: Method Reagent Blank - Prepared to correct for any reagent contributions to sample result. <br />LCS <br />: Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <br />Ms <br />: Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample <br />matrix affects analyte recovery. <br />MSD <br />: Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyted. The recoveries <br />are an indication of how that sample matrix affects analyte recovery. <br />Dup <br />: Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an <br />indication of precision for the preparation and analysis. <br />MSRPD <br />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br />and analysis. <br />ND <br />: Non -detect - Result was below the DQO listed for the analyte. <br /><'/< <br />: High Sample Background - Spike concentration was less than one forth of the sample concentration. <br />D O <br />: Data uali Objective - This is the criteria a ainst which the quality control data is compared. <br />Explanation <br />440 <br />: Sam le nonhomo enei TaX be affecting this anal e. Data was accEEted based on the LCS or CCV recovery. <br />:1 <br />Page 10 of 10 <br />