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July 19, 2022 <br /> Lab No. : STK2237377 <br /> Luhdorff& Scalmanini Consulting <br /> Customer No. : 3012023 <br /> Quality Control -Wet Chem <br /> MS mg/L 40.00 95.0% 85-119 <br /> (SP 2208317-001) MSD mg/L 40.00 99.4% 85-119 <br /> MSRPD mg/L 10.00 4.5% 1519 <br /> MS mg/L 40.00 93.0% 85-119 <br /> (SP 2207685-006) MSD mg/L 40.00 100% 85-119 <br /> MSRPD mg/L 10.00 7.0% 1519 <br /> Nitrite as Nitrogen 300.0 05/26/2022:205900NJB Blank mg/L ND <0.4 <br /> LCS mg/L 15.00 99.9% 90-110 <br /> MS mg/L 30.00 96.3% 74-126 <br /> (SP 2208317-001) MSD mg/L 30.00 101% 74-126 <br /> MSRPD mg/L 10.00 4.6% 520 <br /> MS mg/L 30.00 93.3% 74-126 <br /> (SP 2207685-006) MSD mg/L 30.00 101% 74-126 <br /> MSRPD mg/L 10.00 7.8% <_20 <br /> Sulfate 300.0 05/26/2022:205900NJB Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 102% 90-110 <br /> MS mg/L 100.0 84.7% 82-124 <br /> (SP 2208317-001) MSD mg/L 100.0 89.3% 82-124 <br /> MSRPD mg/L 10.00 2.6% <_23 <br /> MS mg/L 100.0 79.3% 82-124 435 <br /> (SP 2207685-006) MSD mg/L 100.0 84.7% 82-124 <br /> MSRPD mg/L 10.00 2.9% :523 <br /> pH 4500-H B (SP 2208245-001) Dup units 0.3% 4.80 <br /> MBAS 5540C 05/26/2022:206056JBA MS mg/L 10.00 100% 90-110 <br /> (VI 2243682-001) MSD mg/L 10.00 100% 90-110 <br /> MSRPD mg/L 10.00 0.0% :50.1 <br /> MS mg/L 10.00 100% 90-110 <br /> (STK2237377-006) MSD mg/L 10.00 100% 90-110 <br /> MSRPD mg/L 10.00 0.0% :50.1 <br /> Definition <br /> Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <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 /> Explanation <br /> 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 10 of 10 Page 10 of 10 <br />