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August 12, 2022 <br /> Lab No. : STK2250420 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> MS mg/L 30.00 96.7% 74-126 <br /> (STK2250405-001) MSD mg/L 30.00 107% 74-126 <br /> MSRPD mg/L 10.00 9.9% 1520 <br /> MS mg/L 30.00 100% 74-126 <br /> (STK2250420-001) MSD mg/L 30.00 101 % 74-126 <br /> MSRPD mg/L 10.00 0.1% <_20 <br /> Sulfate 300.0 07/26/2022:208373MCA Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 105% 90-110 <br /> MS mg/L 100.0 99.7% 82-124 <br /> (STK2250405-001) MSD mg/L 100.0 110% 82-124 <br /> MSRPD mg/L 10.00 9.4% :523 <br /> MS mg/L 100.0 103% 82-124 <br /> (STK2250420-001) MSD mg/L 100.0 104% 82-124 <br /> MSRPD mg/L 10.00 0.3% :523 <br /> MBAS 5540C 07/26/2022:208648JBA MS mg/L 10.00 100% 90-110 <br /> (STK2250420-001) 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 /> Page 7 of 7 Page 7 of 7 <br />