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March 2, 2021 Lab ID : STK2132062 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control -Inorganic Constituent Method Date/ID Type Units Conc. QC Data DQO Note Wet Chem Nitrate 300.0 (VI 2141048-001) MSD mg/L 40.00 76.4% 85-119 435 MSRPD m 10.00 1.6% 4519 300.0 02/11/21:202162MCA CCB mg/L 0.000 0.5 CCV mg/L 20.00 103% 90-110 CCBmg/L 0.081 0.5 mg/L L 20.00 103% 90-110 Nitrate+Nitrite asN 300.0 02/11/21:201532MCA Blank mg/L ND <0.I Nitrate Nitrogen 300.0 02/11/21:201532MCA Blank mg/L ND <0.1 itrite 300.0 02/11/21:201532MCA Blank mg/L ND <0.5 LCS mg/L 15.00 103% 90-110 MS mg/L 30.00 103% 74-126 (VI 2141023-002) MSD mg/L 30.00 103% 74-126 MSRPD mg/L 10.00 0.9% :520 MS mg/L 30.00 103% 74-126 (VI 2141048-001) MSD mg/L 30.00 102% 74-126 MSRPD m 10.00 0.1% :520 300.0 02/11/21:202162MCA 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 Nitrite Nitrogen 300.0 02/11/21:201532MEA Blank m ND <0.2 Sulfate 300.0 02/11/21:201532MCA Blank mg/L ND <0.5 LCS mg/L 50.00 101% 90-110 MS mg/L 100.0 101% 82424 (VI 2141023-002) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 1.2% 423 MS mg/L 100.0 98.0% 82-124 (VI 2141048-001) MSD mg/L 100.0 98.8% 82-124 MSRPD mg/L 10.00 0.6% :523 300.0 02/I1/21:202162MCA CCB mg/L 0.199 0.5 CCV mg/L 50.00 104% 90-110 CCB mg/L 0.216 0.5 CCV mg/L 50.00 103% 90-110 MBAS 5540C 02/12/21:202357jba CCB mg/L -0.0195 0.25 CCV mg/L 1.000 102% 90-110 CCB mg/L -0.0113 0.25 CCV I mg/L 1.000 102% 1 90-110 BAS Extraction 5540C 02/12/21:201586jba Blank mg/L ND <0.1 LCS mg/L 0.5000 102% 86-114 BS mg/L 0.5000 100% 86-114 BSD mg/L 0.5000 102% 86-114 BSRPD mg/L 0.5000 2.0% <5 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. 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. Page 8 of 9