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January 25,2021 .Lab ID : STK2130038 <br /> Mr. Makmund & Ms. Kireyeva Customer : 3-18628 <br /> Quality Control - Inorganic <br /> Constituent Method D:ttc 11) C)pc (wits Cour. ('IC f)ata I)QO Note <br /> Wet Client <br /> 'titrate-Nitrite as IN 4500NO.F 01I05/21:200093VVH Blank mg'L ND <0.2 <br /> LCS mg/L 11.22 93.8% 80-120 <br /> MS tngil- 5.609 110% 5-255 <br /> (SP 2100042-001) MSD mg!L 5.609 107% 5-23i <br /> MSRPD m*'L 5.609 3.1% S;0.4 <br /> 450UN03 F 101/05,121:200164VVH CCH mg L 0.004 0.2 <br /> CCV ntg L 11.22 93.4% 90-110 <br /> CCB mg/L -0.014 0.2 <br /> CCV me:1. 1 1." 94.0°n 90-110 <br /> \itr:acNivogcn ��OON(:)3l� UIiU„212000c�34`VH 131�n1. m;L \'i) <0.2 <br /> Definition <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 verity that the preparation process is not contributing contamination to the samples. <br /> LCS :Laboratory Control Standardr'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 drat sample <br /> matrix affects analyte recovery. <br /> MSD :Matrix Spike Duplicate of MSIMSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries <br /> are an indicadon of how that sample matrix affects analyte recovery. <br /> MSRPD :MS/MSD Relative Percent Diffemnce(RPD)-The MS relative percent difference is an indication ofprecision for the prepam6ort <br /> and analysis. <br /> t) :Non-detect-Result was below the DOO listed for the analyte. <br /> llQo Data Quality Obiective-This is the criteria against which the S.ualit,% control data is com are,. <br /> Page 9 of 9 <br />