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March 27, 2020 Lab ID : STK2O32768 Frank C Alegre Trucking Inc. Customer : 3-13002 Quality Control-Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Metals Thallium 6010B 03/05/20:20381 IAC CCB ppm 0.0033 0.02 Vanadium 6010B 03/05/20:203811AC CCV ppm 1.000 101% 90-110 CCB ppm -0.0012 0.01 CCV ppm 1.000 -0.08% 90-110 CCB m -0.0013 0.01 inc 6010B 03/05/20:20381 IAC CCV ppm 1.000 100% 90-110 CCB ppm -0.0049 0.02 CCV ppm 1.000 -0.5% 90-110 CCB ppm -0.0049 0.02 enic RCRA 03/26/20:201595ac ExBlk mg/L -0.0028 0.01 s 1 PDS m 4.000 1 186% 75-125 1 430 Definition PDS :PDS failed,matrix-Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte.Data was accepted based on the LCS recovery. CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. ExBlk :TCLP/STLC Extraction Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. <'/4 :High Sample Background-Spike concentration was less than one forth of the sample concentration. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. Explanation 220 :The CCB was greater than the DQO.However,all results were either five times greater than the CCB concentration or ND relative to the PQL. 430 :Post Digestion Spike(PDS)not within Acceptance Range(AR)because of matrix interferences affecting this analyte.Data was accepted based on the LCS recovery. 435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 8 of 8