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Definition <br />Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />DQO : Data Quality Objective - This is the criteria against which the quality control data is compared. <br />LCS : Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte recovery. <br />MS : Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample matrix <br />affects analyte recovery. <br />MSD : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyted. The recoveries are an <br />indication of how that sample matrix affects analyte recovery. <br />MSRPD : MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation and <br />analysis. <br />ND : Non -detect - Result was below the DQO listed for the analyte. <br />PDS : PDS failed, matrix - Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting this analyte. <br />Data was accepted based on the LCS recovery. <br />Explanation <br />430 Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting this analyte. Data was accepted <br />based on the LCS recovery. <br />435 Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />Page 6 of 6 Page 6 of 6 <br />