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Definitions <br /> Environmental Laboratory http://www.teklabinc.com/ <br /> Client: Missouri Cobalt(US Strategic Metals) Work Order: 25040027 <br /> Client Project: Idaho Springs Gold Ore (Colorado) Report Date: 07-Apr-25 <br /> Abbr Definition <br /> * Analytes on report marked with an asterisk are not NELAP accredited <br /> CCV Continuing calibration verification is a check of a standard to determine the state of calibration of an instrument between recalibration. <br /> CRQL A Client Requested Quantitation Limit is a reporting limit that varies according to customer request.The CRQL may not be less than the MDL. <br /> DF Dilution factor is the dilution performed during analysis only and does not take into account any dilutions made during sample preparation.The <br /> reported result is final and includes all dilution factors. <br /> DNI Did not ignite <br /> DUP Laboratory duplicate is a replicate aliquot prepared under the same laboratory conditions and independently analyzed to obtain a measure of <br /> precision. <br /> ICV Initial calibration verification is a check of a standard to determine the state of calibration of an instrument before sample analysis is initiated. <br /> IDPH IL Dept.of Public Health <br /> LCS Laboratory control sample is a sample matrix,free from the analytes of interest,spiked with verified known amounts of analytes and analyzed exactly <br /> like a sample to establish intra-laboratory or analyst specific precision and bias or to assess the performance of all or a portion of the measurement <br /> system. <br /> LCSD Laboratory control sample duplicate is a replicate laboratory control sample that is prepared and analyzed in order to determine the precision of the <br /> approved test method. The acceptable recovery range is listed in the QC Package(provided upon request). <br /> MBLK Method blank is a sample of a matrix similar to the batch of associated sample(when available)that is free from the analytes of interest and is <br /> processed simultaneously with and under the same conditions as samples through all steps of the analytical procedures,and in which no target <br /> analytes or interferences should present at concentrations that impact the analytical results for sample analyses. <br /> MDL "The method detection limit is defined as the minimum measured concentration of a substance that can be reported with 99%confidence that the <br /> measured concentration is distinguishable from method blank results." <br /> MS Matrix spike is an aliquot of matrix fortified(spiked)with known quantities of specific analytes that is subjected to the entire analytical procedures in <br /> order to determine the effect of the matrix on an approved test method's recovery system.The acceptable recovery range is listed in the QC <br /> Package(provided upon request). <br /> MSD Matrix spike duplicate means a replicate matrix spike that is prepared and analyzed in order to determine the precision of the approved test method. <br /> The acceptable recovery range is listed in the QC Package(provided upon request). <br /> MW Molecular weight <br /> NC Data is not acceptable for compliance purposes <br /> ND Not Detected at the Reporting Limit <br /> NELAP NELAP Accredited <br /> PQL Practical quantitation limit means the lowest level that can be reliably achieved within specified limits of precision and accuracy during routine <br /> laboratory operation conditions. <br /> RL The reporting limit the lowest level that the data is displayed in the final report. The reporting limit may vary according to customer request or sample <br /> dilution.The reporting limit may not be less than the MDL. <br /> RPD Relative percent difference is a calculated difference between two recoveries(ie.MS/MSD).The acceptable recovery limit is listed in the QC <br /> Package(provided upon request). <br /> SPK The spike is a known mass of target analyte added to a blank sample or sub-sample;used to determine recovery deficiency or for other quality <br /> control purposes. <br /> Surr Surrogates are compounds which are similar to the analytes of interest in chemical composition and behavior in the analytical process,but which are <br /> not normally found in environmental samples. <br /> TIC Tentatively identified compound: Analytes tentatively identified in the sample by using a library search. Only results not in the calibration standard <br /> will be reported as tentatively identified compounds. Results for tentatively identified compounds that are not present in the calibration standard,but <br /> are assigned a specific chemical name based upon the library search,are calculated using total peak areas from reconstructed ion chromatograms <br /> and a response factor of one. The nearest Internal Standard is used for the calculation. The results of any TICs must be considered estimated,and <br /> are flagged with a"T". If the estimated result is above the calibration range it is flagged"ET" <br /> TNTC Too numerous to count(>200 CFU) <br /> Page 3 of 8 <br />