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June 26, 2018 Lab ID : STK1838366 <br /> Aleck Dambacher Customer : 3-15291 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br /> Wet Chem <br /> Nitrate 300.0 MS mg/L 400.0 95.1% 85-119 <br /> (STK1838366-002) MSD mg/L 400.0 95.4% 85-119 <br /> MSRPD mg/L 500.0 0.3% 519 <br /> Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 96.8% 90-110 <br /> MS mg/L 400.0 94.1% 85-119 <br /> (STK1838366-001) MSD mg/L 400.0 94.7% 85-119 <br /> MSRPD I m 500.0 0.6% 1 <19 <br /> ;uO.0 06/15/18:208547mca CCB ppm 0.000 0.5 <br /> CCV ppm 20.00 97.5% 90-110 <br /> CCB ppm 0.000 0.5 <br /> CCV ppm 20.00 97.4% 90-110 <br /> CCB ppm 0.000 0.5 <br /> CCV ppm 1 20.00 1 98.1% 90-110 <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 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 compared. <br /> Page 14 of 14 <br />