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June 10, 2024 Lab No. : STK2437367 Luhdorff& Scalmanini Consulting Customer No. : 3012023 Quality Control -Wet Chem MSRPD mg/L 0.1% :57 MS mg/L 100.0 97.7% 18-165 (SP 2408155-001) MSD mg/L 100.0 97.8% 18-165 MSRPD mg/L 0.1% 157 Blank mg/L ND <0.5 LCS mg/L 50.00 99.4% 90-110 MS mg/L 100.0 91.2% 18-165 (STK2437367-005) MSD mg/L 100.0 91.0% 18-165 MSRPD mg/L 0.2% :57 MBAS 5540C 05/23/2024:205778KRH Blank mg/L ND <0.1 LCS mg/L 0.5000 103% 86-114 BS mg/L 0.5000 103% 86-114 BSD mg/L 0.5000 103% 86-114 BSRPD mg/L 0.4% <_5 Definition Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. BS : Blank Spikes-A blank is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. BSD : Blank Spike Duplicate of BS/BSD pair-A blank duplicate is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. BSRPD : BS/BSD Relative Percent Difference(RPD)-The BS relative percent difference is an indication of precision for the preparation and analysis. Dup : Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. 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 analyted.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. Page 17 of 17 Page 17 of 17