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September 24, 2021 Lab ID : STK2152815 Metal Finishing Solutions, Inc. Customer : 3-18181 Quality Control-Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Fluoride 300.0 (STK2150623-014) MSD mg/L 5.000 104% 87-120 MSRPD mg/L 50.00 0.06% <16 MS mg/L 5.000 103% 87-120 (STK2150623-003) MSD mg/L 5.000 102% 87-120 MSRPD m /L 50.00 0.5% <16 300.0 09/20/21:214717njb ICB mg/l 0.00 0.1 ICV mg/l 2.500 100% 90-110 CCB mg/l 0.00 0.1 CCV mg/l 2.500 101% 90-110 CCB mg/l 1.12 0.1 220 CCV mg/l 2.500 102% 90-110 CCB mg/l 0.0200 0.1 CCV mg/l 2.500 101% 90-110 CCB mg/l 0.0100 0.1 CCV mg/l 2.500 102% 90-110 300.0 09/23/21:211037MCA Blank mg/L ND <0.1 LCS mg/L 2.500 102% 90-110 MS mg/L 5.000 102% 87-120 (CC 2183327-001) MSD mg/L 5.000 101% 87-120 MSRPD mg/L 10.00 0.5% <16 MS mg/L 5.000 99.4% 87-120 (CH 2177502-001) MSD mg/L 5.000 100% 87-120 MSRPD m /L 10.00 0.7% <16 300.0 09/23/21:214932njb ICB mg/l 0.00 0.1 ICV mg/l 2.500 98.6% 90-110 CCB mg/l 0.00 0.1 CCV mg/l 2.500 99.7% 90-110 Definition ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. ICB :Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. Explanation 220 :The CCB was greater than the DQO.However,all results were either five times greater than the CCB concentration or ND relative to the PQL. 435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 15 of 15