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June 9, 2021 Lab ID : STK2136696 <br />San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br />Quality Control - Inorganic <br />Constituent Method Date/ID Type Units Conc. QC Data DQO Note <br />Wet Chem <br />Nitrate 300.0 (STK2136696-001) MSD mg/L 40.00 99.1 % 85-119 <br />MSRPD mg/L 10.00 0.8% <19 <br />300.0 05/13/21:207101MCA ICB mg/L 0.000 0.5 <br />ICV mg/L 20.00 102% 90-110 <br />CCB mg/L 0.083 0.5 <br />CCV mg/L 20.00 103% 90-110 <br />Nitrate + Nitrite as N 300.0 05/13/21:205293MCA Blank mg/L ND <0.! <br />Nitrate Nitrogen 300.0 05/13/21:205293MCA Blank mg/L ND <0.1 <br />Nitrite 300.0 05/13/21:205293MCA Blank mg/L ND <0.5 <br />LCS mg/I. 15.00 101% 90-110 <br />MS mg/L 30.00 102% 74-126 <br />(STK2136694-001) MSD mg/L 30.00 102% 74-126 <br />MSRPD mg/L 10.00 0.04% <20 <br />MS mg/L 30.00 101 % 74-126 <br />(STK2136696-001) MSD mg/L 30.00 102% 74-126 <br />MSRPD mg/L 10.00 1.3% 20 <br />300.0 05/13/21:207101MCA ICB mg/L 0.000 0.5 <br />ICV mg/L 15.00 102% 90-110 <br />CCB mg/L 0.000 0.5 <br />CCV mg/i. 15.00 102% 90-110 <br />Nitrite Nitrogen 300.0 05/13/21:205293MCA Blank mg/i. ND <0.2 <br />Sulfate 300.0 05/13/21:205293MCA Blank mg/L ND <0.5 <br />LCS mg/L 50.00 102% 90-110 <br />MS mg/L 100.0 101% 82-124 <br />(STK2136694-001) MSD mg/L 100.0 101 % 82-124 <br />MSRPD mg/L 10.00 0.2% <3 <br />MS mg/L 100.0 101 % 82-124 <br />(STK2136696-00 l ) MSD mg/L 100.0 102% 82-124 <br />MSRPD mg/L 10.00 1.3% <3 <br />300.0 05/13/21:207101MCA ICB mg/L 0.000 0.5 <br />ICV mg/L 50.00 102% 90-110 <br />CCB mg/L 0.178 0.5 <br />CCV mg/L 50.00 103% 90-110 <br />pH 4300-1113 (STK2136696-001 ) Dup units 0.1% 4.80 <br />4500HB 05/14/21:207136JBA CCV units 8.000 101 % 95-105 <br />CCV units 8.000 101 % 95-105 <br />MBAS 5540C 05/13/21:207229JBA CCB mg/L -0.0393 0.25 <br />CCV mg/L 1.000 101% 90-110 <br />CCB mg/L -0.0268 0.25 <br />CCV mg/L 1.000 !00% 90-110 <br />MBAS Extraction 5540C 05/13/21:205389JBA Blank mg/L ND <0.1 <br />LCS mg/L 0.5000 101% 86-114 <br />BS mg/L 0.5000 90.9% 86-114 <br />BSD mg/L 0.5000 91.3% 86-114 <br />BSRPD mg/L 0.5000 0 0021 <0.1 <br />Definition <br />ICV : Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br />ICB : Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />CCV : Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <br />CCB : Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br />Blank : Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <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 <br />matrix affects analyte recovery. <br />Page 8 of 9