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June 9, 2021 Lab ID : STK2135836 San Joaquin Co. Environmental Health Dep Customer :3-17919 Quality Control - Inorganic Constituent Method Date/ID Type Units Cone. QC Data DQO Note Wet Chem Nitrite 300.0 (VI 2143528-003) MSD mg/L 30.00 102% 74-126 MSRPD m 10.00 2.1% :520 300.0 05/18/21:207341MCA CCB mg/L 0.000 0.5 CCV mg/L 15.00 103% 90-110 CCB mg/L 0.000 0.5 CCV m 15.00 103% 90-110 itriteNitroacn 300.0 05/17/21:205381MCA Blank m ND <0.2 Sulfate 300.0 05/17/21:205381MCA Blank mg/L ND <0.5 LCS mg/L 50.00 100% 90-110 MS mg/L 100.0 101% 82-124 (VI 2143528-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 2.3% <23 MS mg/L 100.0 98.6% 82-124 (VI 2143528-003) MSD mg/L 100.0 101% 82-124 MSRPD mg/L 10.00 2.3% <_23 300.0 05/18/21:207341MCA CCB mg/L 0.191 0.5 CCV mg/L 50.00 102% 90-110 CCB mg/L 0.177 0.5 CCV m 50.00 102% 90-110 Nitrate + Nitrite as N 450ONO3F 05/04/21:204889VVH Blank mg/L ND <0.2 LCS mg/L 11.22 98.6% 80-120 MS mg/L 5.609 96.9% 5-285 (STK2135863-001) MSD mg/L 5.609 99.4% 5-285 MSRPD m 5.609 2.1% <_30.4 450ONO3F 05/04/21:206594VVH CCB mg/L 0.066 0.2 CCV mg/L 11.22 99.1% 90-110 CCB mg/L 0.125 0.2 CCV m 11.22 105% 90-110 Nitrate as NO3 450ONO3F 05/04/21:204889VVH Blank m ND <0.9 Nitrate Nitrogen 450ONO3F 05/04/21:204889VVH Blank mg/L ND <0.2 BAS 5540C 05/12/21:207000amm CCB mg/L -0.0393 0.25 CCV mg/L 1.000 90-110 101% CCB mg/L -0.0351 0.25 CCV m 1.000 97.0% 90-110 AS Extraction 5540C 05/01/21:205222amm Blank mg/L ND <0.1 LCS mg/L 0.5000 96.6% 86-114 BS mg/L 0.5000 98.0% 86-114 BSD mg/L 0.5000 99.7% 86-114 BSRPD m 0.5000 0.0083 <_0.1 Definition 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. : Matrix Spikes - A random sample is spiked with a known amount of analyte. The recoveries are an indication of how that sample MS matrix affects analyte recovery. : Matrix Spike Duplicate of MS/MSD pair - A random sample duplicate is spiked with a known amount of analyte. The recoveries MSD are an indication of how that sample matrix affects analyte recovery. : Blank Spikes - A blank is spiked with a known amount of analyte. It is prepared to verify that the preparation process is not BS affecting analyte recovery. : Blank Spike Duplicate of BS/BSD pair - A blank duplicate is spiked with a known amount of analyte. It is prepared to verify that BSD the preparation process is not affecting analyte recovery. : Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative percent difference is an p indication of precision for the preparation and analysis. Page 8 of 9