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July 24, 2018 Lab ID : STK1839418 <br /> Metal Finishing Solutions, Inc. Customer : 3-18181 <br /> Quality Control-Inorganic <br /> Constituent Method Date/ID Type Units Conc. QC Data DQO \ote <br /> Metals <br /> inc 3010 07/09/18:207923amb Blank ug/L ND <10 <br /> LCS ugfL 40.00 107% 85-115 <br /> Ms ug/L 40.00 88.7% 75-125 <br /> (VI 1843334-001) MSD ug/L 40.00 86.4% 75-125 <br /> MSRPD ug/L 40.00 1.2% <20.0 <br /> PDS u 40.00 1 138% 1 75-125 1 430 <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 /> 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 analyted.The recoveries <br /> are an 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 <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 com ared. <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 7 of 7 <br />