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February 9, 2024 <br /> Lab No. : STK2431581 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> (STK2431581-001) MSD mg/L 30.00 278% 88-111 435 <br /> MSRPD mg/L 91.1% <_8 435 <br /> MS mg/L 30.00 88.7% 88-111 <br /> (SP 2401622-001) MSD mg/L 30.00 104% 88-111 <br /> MSRPD mg/L 15.8% :58 435 <br /> Sulfate 300.0 02/02/2024:20135OLDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 102% 90-110 <br /> MS mg/L 100.0 102% 18-165 <br /> (STK2431581-001) MSD mg/L 100.0 448% 18-165 435 <br /> MSRPD mg/L 122.4% :57 435 <br /> MS mg/L 100.0 183% 18-165 435 <br /> (SP 2401622-001) MSD mg/L 100.0 95.5% 18-165 <br /> MSRPD mg/L 46.2% :57 435 <br /> MBAS 5540C 02/02/2024:201371KRH MS mg/L 1.000 100% 90-110 <br /> (SP 2401622-001) MSD mg/L 1.000 100% 90-110 <br /> MSRPD mg/L 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 /> Explanation <br /> 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 7 of 7 Page 7 of 7 <br />