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<br />August 30, 2022 <br />Republic Services Lab No.: STK2250597 <br />Customer No.: 3008692 <br /> <br />Quality Control - Wet Chem <br />Constituent Method Date/ID Type Units Conc.QC Data DQO Note <br />(CC 2282967-003)Dup mg/kg 57.5%15.9 440 <br />pH 9045C (SP 2212855-001)Dup units 1.03%5.84 <br />Definition <br />Blank :Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br />DQO :Data Quality Objective - This is the criteria against which the quality control data is compared. <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 />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 matrix <br />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 are an <br />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 and <br />analysis. <br />ND :Non-detect - Result was below the DQO listed for the analyte. <br />RgBlk :Method Reagent Blank - Prepared to correct for any reagent contributions to sample result. <br />Explanation <br />325 :LCS not within Acceptance Range (AR). Data could not be confirmed by reanalysis. Use results with discretion. <br />435 :Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery. <br />440 :Sample nonhomogeneity may be affecting this analyte. Data was accepted based on the LCS or CCV recovery.