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April 10, 2026 <br /> Lab No. : STK2634626 <br /> Live Oak Geo Environmental <br /> Customer No. : 3016608 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Nitrate Nitrogen 4500NO3F 04/08/2026:203767MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.3% 80-120 <br /> MS mg/L 5.609 105% 66-125 <br /> (CH 2672911-001) MSD mg/L 5.609 94.3% 66-125 <br /> MSRPD mg/L 5.5% :530.4 <br /> Definition <br /> Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <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 /> Page 6 of 6 Page 6 of 6 <br />