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July 9, 2024 <br /> Lab No. : STK2438833 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> LCS mg/L 4.567 103% 90-110 <br /> MS mg/L 9.134 102% 88-111 <br /> (STK2438833-001) MSD mg/L 9.134 101% 88-111 <br /> MSRPD mg/L 0.2% :58 <br /> MS mg/L 9.134 100% 88-111 <br /> (STK2438639-002) MSD mg/L 9.134 100% 88-111 <br /> MSRPD mg/L 0.2% :58 <br /> Sulfate 300.0 06/14/2024:206675LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 103% 90-110 <br /> MS mg/L 100.0 101% 18-165 <br /> (STK2438833-001) MSD mg/L 100.0 101% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 100.0 99.1% 18-165 <br /> (STK2438639-002) MSD mg/L 100.0 98.9% 18-165 <br /> MSRPD mg/L 0.2% <_7 <br /> MBAS 5540C 06/14/2024:206700KRH MS mg/L 10.00 100% 90-110 <br /> (CH 2474832-001) MSD mg/L 10.00 100% 90-110 <br /> MSRPD mg/L 0.0% 150.1 <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 /> Page 7 of 7 Page 7 of 7 <br />