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March 2, 2021 Lab ID : STK2131973 <br /> San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br /> Quality Control-Inorganic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Wet Chem <br /> Nitrate 300.0 (CH 2170594-001) MSD mg/L 40.00 103% 85-119 <br /> MSRPD mg/L 10.00 1.5% <19 <br /> 300.0 02/10/21:202114MCA CCB mg/L 0.000 0.5 <br /> CCV mg/L 20.00 103% 90-110 <br /> CCB mg/L 0.000 0.5 <br /> CCV mg/L 20.00 102% 90-110 <br /> itrate+Nitrite as N 300.0 02/10/21:201466MCA Blank mg/L ND <0.I <br /> Nitrate Nitrogen 300.0 02/10/21:201466MCA Blank mg/L ND <0.I <br /> Nitrite 300.0 02/10/21:201466MCA Blank mg/L ND <0.5 <br /> LCS mg/L 15.00 103% 90-110 <br /> MS mg/L 30.00 102% 74-126 <br /> (STK2131853-001) MSD mg/L 30.00 103% 74-126 <br /> MSRPD mg/L 10.00 0.2% <_20 <br /> MS mg/L 30.00 100% 74-126 <br /> (CH 2170594-001) MSD mg/L 30.00 102% 74-126 <br /> MSRPD mg/L 10.00 1.6% :520 <br /> 300.0 02/10/21:202114MCA CCB mg/L 0.000 0.5 <br /> CCV mg/L 15.00 102% 90-110 <br /> CCB mg/L 0.000 0.5 <br /> CCV mg/L 15.00 102% 90-110 <br /> Nitrite Nitrogen 300.0 02/10/21:201466MCA Blank m ND <0.2 <br /> Sulfate 300.0 02/10/21:201466MCA Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 102% 90-110 <br /> MS mg/L 100.0 96.8% 82-124 <br /> (STK2131853-001) MSD mg/L 100.0 97.6% 82-124 <br /> MSRPD mg/L 10.00 0.6% :523 <br /> MS mg/L 100.0 98.9% 82-124 <br /> (CH 2170594-001) MSD mg/L 100.0 101% 82-124 <br /> MSRPD mg/L 10.00 1.9% :523 <br /> 300.0 02/10/21:202114MCA CCBmg/L 0.202 0.5 <br /> CCV mg/L 50.00 102% 90-110 <br /> CCB mg/L 0.212 0.5 <br /> CCV mg/L 50.00 101% 90-110 <br /> H 4500-H B I2140684-001) Du units 0.6% 4.80 <br /> 4500HB 02/15/21:202269JBA CCV units 8.000 103% 95-105 <br /> CCV units 8.000 104% 95-105 <br /> AS 5540C 02/10/21:202358jba CCB mg/L -0.0400 0.25 <br /> CCV mg/L 1.000 101% 90-110 <br /> CCB mg/L -0.0400 0.25 <br /> CCV mg/L 1.000 102% 90-110 <br /> BAS Extraction 5540C 02/10/21:201755jba Blank mg/L ND <0.1 <br /> LCS mgt 0.5000 101% 86-114 <br /> BS mg/L 0.5000 91.8% 86-114 <br /> BSD mg/L 0.5000 89.4% 86-114 <br /> BSRPD m 0.5000 1 0.012 1 <0.1 <br /> Definition <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 /> MSD :Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyte.The recoveries <br /> are an indication of how that sample matrix affects analyte recovery. <br /> Page 8 of 9 <br />