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December 22, 2020 Lab ID : STK2056526 <br /> Luhdorff& Scalmanini, Consulting Eng. Customer : 3-12023 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ll) TN pe Units Cone. QC Data DQO Note <br /> Wet Chem <br /> Sulfate 300.0 11/25/20:219093JMR CCB m&L 0.195 0.5 <br /> CCV m L 50.00 101% 90-110 <br /> MBAS 5540C I1/25/20:219118jba CCB mg/L 0.000 0.1 <br /> CCV mgfL 10.00 100% 1 99-101 <br /> MBAS Screen 5540C MS mg/L 10.00 100% <br /> 90-11( <br /> 0-1 1 O <br /> (CC 2083922-002) MSD mg/L 10.00 I00% 90-I 10 <br /> MSRPD m L 10.00 0.0 .50.I <br /> Definition <br /> ICB Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. <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 analyte.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 /> <'/. :High Sample Background-Spike concentration was less than one forth of the sample concentration. <br /> DQO Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> Page 11 of 11 <br />