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February 20, 2019 Lab ID : STK1931316 <br /> Aramark Uniform- Customer : 3-17510 <br /> Quality Control-Inorganic <br /> Constituent Method Date/1D Type Units Cone. QC Data DQO Note <br /> Metals <br /> Chromium 3010 02/05/19:201279EMM Blank mg/L ND <0.1 <br /> LCS mg/L 4.000 102% 85-115 <br /> MS mg/L 4.000 72.2% 75-125 435 <br /> (STK1931316-001) MSD mg/L 4.000 82.2% 75-125 <br /> MSRPD mg/L 4.000 12.9% <20 <br /> PDS m /L 4.000 77.7% 75-125 <br /> Lead 3010 02/05/19:201279EMM Blank mg/L ND <0.8 <br /> LCS mg/L 4.000 103% 85-115 <br /> MS mg/L 4.000 60.3% 75-125 435 <br /> (STK1931316-001) MSD mg/L 4.000 68.4% 75-125 435 <br /> MSRPD mg/L 4.000 0.32 <0.8 <br /> PDS I m /L 4.000 63.7% 1 75-125 430 <br /> Selenium 3010 02/05/19:201279EMM Blank mg/L ND <0.1 <br /> LCS mg/L 4.000 96.8% 85-115 <br /> MS mg/L 4.000 89.2% 75-125 <br /> (STK1931316-001) MSD mg/L 4.000 89.7% 75-125 <br /> MSRPD mg/L 4.000 0.6% <20 <br /> PDS mg/L 1 4.000 83.9% 75-125 <br /> Silver 3010 02/05/19:201279EMM Blank mg/L ND <0.05 <br /> LCS mg/L 4.000 104% 85-115 <br /> MS mg/L 4.000 94.2% 75-125 <br /> (STK1931316-001) MSD mg/L 4.000 68.9% 75-125 435 <br /> MSRPD mg/L 4.000 31.0% <_20 435 <br /> PDS I mg/L 4.000 89.3% 1 75-125 <br /> Wet Chem <br /> H 4500HB 02/18/19:202392jba CCV units 8.000 102% 95-105 <br /> CCV units 8.000 102% 95-105 <br /> 9045C (CC 1980270-001) 21!p units 0.1% 5.84 <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 /> 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 /> 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 11 of 11 <br />