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April 2, 2021 Lab ID : STK2133581 San Joaquin Co.Environmental Health Dep Customer : 3-17919 Quality Control -Inorganic Constituent 'Method Date/ID Type Units Cone. QC Data l)QO Note Wet Chem Sulfate 300.0 (SP 2103651-001) MSD mg/L 100.0 108% 82-124 MSRPD m 10.00 1.0% :_23 300.0 03/19/21:204214MCA CCB m9/L 0.132 0.5 CCV mg/L 50.00 106% 90-110 CCB mg/L 0.131 0.5 CCV m 50.00 105% 90-110 Nitrate+Nitrite as N 450ONO3F 03/17/21:202926VVH Blank mg/L ND <0.2 LCS mg/L 11.22 101% 80-120 MS mg/L 5.609 104% 5-285 (SP 2103652-001) MSD mg/L 5.609 106% 5-285 MSRPD m 5.609 1.7% 1 :530.4 450ONO3F 03/17/21:203986VVH ICB mg/L 0.041 0.2 ICV mg/L 11.22 101% 90-110 CCB mg/L 0.057 0.2 CCV I mg/L 11.22 98.6% 90-110 Nitrate as NO3 450ONO3F 03/17/21:202926VVH Blank mg/L ND <0.9 Nitrate Nitrogen 450ONO3F I 03/17/21:202926WH Blank mg/L ND <0.2 Nitrite as Nitrogen 450ONO3F 03/17/21:202927VVH Blank mg/L ND <0.4 LCS mg/I. 1.218 103% 80-120 MS mg/L 0.6090 108% 50-150 (SP 2103652-001) MSD mg/L 0.6090 108% 50-150 MSRPD mg/L 0.6090 1 0.0010 :50.4 450ONO3F 03/17/21:203984VVH ICB mg/L 0.00900 0.012 ICV mg/L 1.218 103% 90-110 CCB mg/L 0.00900 0.012 CCV I mg/L L-118 102% 90-110 BAS 5540C 03/17/21:204490JBA CCB mg/L -0.0268 0.25 CCV mg/L 1.000 96.1% 90-110 CCB mg/L -0.0226 0.25 CCV m 1.000 96.1% 90-110 BAS Extraction 55400 03/17/21:203286JBA Blank mg/L ND <0.1 LCS mg/L 0.5000 96.6% 86-114 BS mg/L 0.5000 93.8% 86-114 BSD mg/L 0.5000 96.7% 86-114 BSRPD I mg/L 0.5000 0.015 <0.1 Definition ICV :Initial Calibration Verification-Analyzed to verify the instrument calibration is within criteria. ICB :Initial Calibration Blank-Analyzed to verify the instrument baseline is within criteria. CCV :Continuing Calibration Verification-Analyzed to verify the instrument calibration is within criteria. CCB :Continuing Calibration Blank-Analyzed to verify the instrument baseline is within criteria. Blank :Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. LCS :Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. Ms :Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. BS :Blank Spikes-A blank is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. BSD :Blank Spike Duplicate of BS/BSD pair-A blank duplicate is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting analyte recovery. Dup :Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. MSRPD :MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. Page 8 of 9