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April 13 , 2020 Lab ID : STK2033510 <br /> Metal Finishing Solutions , Inc. Customer : 348181 <br /> Quality Control = Inorganic <br /> Definition <br /> PDS PDS failed, matrix - Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting this <br /> analyte. Data was accepted based on the LCS recovery. <br /> ICV : Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br /> ICB : Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br /> CCV : Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br /> CCB : Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br /> Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <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 <br /> matrix affects analyte recovery. <br /> MSD : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyte. The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> BS : Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not <br /> affecting analyte recovery. <br /> BSD : Blank Spike Duplicate of BS/BSD pair - A blank duplicate is spiked with a known amount of analyte. It is prepared to verify that <br /> the preparation process is not affecting analyte recovery. <br /> Dup : 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 : MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an indication of precision for the preparation <br /> and analysis . <br /> BSRPD : BS/BSD Relative Percent Difference (RPD) - The BS relative percent difference is an indication of precision for the preparation <br /> and analysis . <br /> ND : Non-detect - Result was below the DQO listed for the analyte. <br /> DQO : Data Quality Objective - This is the criteria against which the quality control data is compared. <br /> Explanation <br /> 430 : Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting this analyte. Data was <br /> accepted 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 8 of 8 <br />