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<br />June 28, 2023 <br />Tracy Material Recovery & Solid Waste WS Lab No.: STK2337011 <br />Customer No.: 3016455 <br /> <br />Quality Control - Metals <br />Constituent Method Date/ID Type Units Conc.QC Data DQO Note <br />MSRPD mg/kg 40.00 4.0%≤20 <br />PDS mg/kg 40.00 82.6 %75-125 <br />Zinc 3050 06/20/2023:206762AC Blank mg/kg ND <1 <br />LCS mg/kg 40.00 90.8 %85-115 <br />MS mg/kg 40.00 96.1 %75-125 <br />(STK2337010-001)MSD mg/kg 40.00 66.0 %75-125 435 <br />MSRPD mg/kg 40.00 9.2%≤20 <br />PDS mg/kg 40.00 93.6 %75-125 <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 />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 />PDS :PDS failed, matrix - Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting this analyte. <br />Data was accepted based on the LCS recovery. <br />Explanation <br />435 :Sample matrix may be affecting this analyte. Data was accepted based on the LCS or CCV recovery.