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June 10, 2024 <br /> Lab No. : STK2437645 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> LCS mg/L 4.567 98.6% 90-110 <br /> MS mg/L 9.134 96.7% 88-111 <br /> (SP 2408394-003) MSD mg/L 9.134 97.2% 88-111 <br /> MSRPD mg/L 0.5% :58 <br /> MS mg/L 9.134 99.3% 88-111 <br /> (SP 2408394-001) MSD mg/L 9.134 99.6% 88-111 <br /> MSRPD mg/L 0.3% :58 <br /> Sulfate 300.0 05/29/2024:205997LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 98.4% 90-110 <br /> MS mg/L 100.0 66.3% 18-165 <br /> (SP 2408394-003) MSD mg/L 100.0 77.7% 18-165 <br /> MSRPD mg/L 4.3% :57 <br /> MS mg/L 100.0 64.3% 18-165 <br /> (SP 2408394-001) MSD mg/L 100.0 63.8% 18-165 <br /> MSRPD mg/L 0.2% <_7 <br /> MBAS 5540C 05/29/2024:206015KRH MS mg/L 10.00 100% 90-110 <br /> (STK2437608-001) 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 />