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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/ID Type Units Conc. QC Data DQO Note Wet Chem Nitrite as Nitrogen 4500NO2B 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 4500NO3F 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 4500NO3F 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 4500NO3F 04/26/22:204578vvh Blank mg/L ND <0.9 Nitrate Nitrogen 4500NO3F 04/26/22:204578vvh Blank mg/L ND <0.2 MBAS 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 MBAS 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 mg/L 0.5000 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. <¼ : 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.