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May 31, 2022 Lab ID : STK2235613 San Joaquin Co. Environmental Health Dep Customer : 3-17919 Quality Control-Inorganic Constituent Method Date/1D Type Units Cone. QC Data DQO Note Wet Chem Nitrite as Nitrogen 450ONO2B 04/23/22:205954amm CCV mg/l 0.1523 94.9% 90-110 CCB mg/l -0.00153 0.1 CCV mg/l 0.1523 93.2% 90-110 CCB mg/l -0.00153 0.1 Nitrate+Nitrite as N 450ONO3F 04/26/22:204578vvh Blank mg/L ND <0.2 LCS mg/L 11.22 98.8% 80-120 MS mg/L 5.609 94.1% 5-285 (SP 2206816-001) MSD mg/L 5.609 94.8% 5-285 MSRPD mg/L 5.609 0.3% <30.4 450ONO3F 04/26/22:205956vvh CCB mg/l 0.150 0.2 CCV mg/l 11.22 98.7% 90-110 CCB mg/l 0.144 0.2 CCV mg/l 11.22 99.4% 90-110 Nitrate as NO3 450ONO3F 04/26/22:204578vvh Blank mg/L ND <0.9 Nitrate Nitrogen 450ONO3F 04/26/22:204578vvh Blank mg/L ND <0.2 BAS 5540C 04/23/22:205847amm CCB mg/l -0.0524 0.25 CCV mg/l 1.000 97.2% 90-110 CCB mg/l -0.0568 0.25 CCV mg/l 1.000 101% 90-110 BAS Extraction 5540C 04/23/22:204511amm Blank mg/L ND <0.1 LCS mg/L 0.5000 101% 86-114 BS mg/L 0.5000 99.8% 86-114 BSD mg/L 0.5000 105% 86-114 BSRPD m 0.5000 1 5.6% <5 410 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. 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. BSRPD :BS/BSD Relative Percent Difference(RPD)-The BS relative percent difference is an indication of precision for the preparation and analysis. ND :Non-detect-Result was below the DQO listed for the analyte. <y, :High Sample Background-Spike concentration was less than one forth of the sample concentration. DQO :Data Quality Objective-This is the criteria against which the quality control data is compared. Explanation 360 :CCV above Acceptance Range(AR).Samples which were non detect for this analyte were accepted. 410 :Relative Percent Difference(RPD)not within Maximum Allowable Value(MAV).Data was accepted based on the LCS or CCV recovery. 435 :Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 8 of 8