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September 29, 2022 <br /> Lab No. : STK2252281 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> (VI 2246204-006) MSD mg/L 30.00 105% 74-126 <br /> MSRPD mg/L 50.00 13.2% <_20 <br /> MS mg/L 30.00 42.4% 74-126 435 <br /> (SP 2213182-003) MSD mg/L 30.00 50.4% 74-126 435 <br /> MSRPD mg/L 50.00 17.2% :520 <br /> Sulfate 300.0 08/31/2022:209925LDM Blank mg/L 1 <0.5 <br /> LCS mg/L 50.00 105% 90-110 <br /> MS mg/L 100.0 94.3% 82-124 <br /> (VI 2246204-006) MSD mg/L 100.0 108% 82-124 <br /> MSRPD mg/L 50.00 11.9% :523 <br /> MS mg/L 100.0 39.8% 82-124 435 <br /> (SP 2213182-003) MSD mg/L 100.0 72.3% 82-124 435 <br /> MSRPD mg/L 50.00 10.2% :523 <br /> MBAS 5540C 08/31/2022:210109JBA MS mg/L 10.00 100% 90-110 <br /> (SP 2213958-001) MSD mg/L 10.00 100% 90-110 <br /> MSRPD mg/L 10.00 0.0% :50.1 <br /> Definition <br /> <1/4 : High Sample Background-Spike concentration was less than one forth of the sample concentration. <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 /> 440 Sample nonhomogeneity 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 />