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APTIM - Solid Waste Department <br />4171 Essen Lane <br />Baton Rouge, LA 70809 <br />Project: <br />Project Number: <br />Project Manager: <br />North County LF, SJ County-Groundwater <br />631038217 <br />Sandra Pimienta <br />Reported:02/13/2025 14:18 <br />Quality Control Report - Precision & Accuracy <br />Constituent Sample IDType Result Result Added Units RPD Recovery RPD Recovery Quals <br />Source Spike Percent Percent <br />Control Limits <br />Water Analysis (General Chemistry) <br />Source Lab <br />R# <br />QC Batch ID: B202439 Used client sample: N <br />Bicarbonate DUP 347.80 1.1 10344.092501220-01 mg/L 1 <br />Carbonate Alkalinity as CaCO3 DUP ND 10ND2501220-01 mg/L 1 <br />Total Alkalinity as CaCO3 DUP 285.25 1.1 10282.212501220-01 mg/L 1 <br />QC Batch ID: B202440 Used client sample: Y - Description: G-11, 01/22/2025 13:20 <br />Bicarbonate DUP 101.83 0.7 10101.092501242-02 mg/L 2 <br />Carbonate Alkalinity as CaCO3 DUP ND 10ND2501242-02 mg/L 2 <br />Total Alkalinity as CaCO3 DUP 83.520 0.7 1082.9102501242-02 mg/L 2 <br />QC Batch ID: B204880 Used client sample: N <br />Chloride DUP 119.44 0.8 10118.512501229-01 mg/L 3 <br />MS 225.34 80 - 120118.51 101.01 1062501229-01 mg/L 4 <br />MSD 225.83 0.2 10 80 - 120118.51 101.01 1062501229-01 mg/L 5 <br />Nitrate as N DUP 21.817 0.6 1021.6892501229-01 mg/L 3 <br />MS 31.891 80 - 12021.689 10.101 1012501229-01 mg/L 4 <br />MSD 31.954 0.2 10 80 - 12021.689 10.101 1022501229-01 mg/L 5 <br />Sulfate DUP 388.02 0.4 10386.432501229-01 mg/L 3 <br />MS 593.03 80 - 120386.43 202.02 1022501229-01 mg/L 4 <br />MSD 592.88 0.0 10 80 - 120386.43 202.02 1022501229-01 mg/L 5 <br />QC Batch ID: B204891 Used client sample: N <br />Dissolved Calcium DUP 26.240 0.2 2026.1782501214-01 mg/L 6 <br />MS 36.857 75 - 12526.178 10.204 1052501214-01 mg/L 7 <br />MSD 36.892 0.1 20 75 - 12526.178 10.204 1052501214-01 mg/L 8 <br />Dissolved Magnesium DUP 10.587 0.2 2010.6112501214-01 mg/L 6 <br />MS 21.072 75 - 12510.611 10.204 1032501214-01 mg/L 7 <br />MSD 21.096 0.1 20 75 - 12510.611 10.204 1032501214-01 mg/L 8 <br />Dissolved Sodium DUP 7.3064 0.5 207.34352501214-01 mg/L 6 <br />MS 17.524 75 - 1257.3435 10.204 99.82501214-01 mg/L 7 <br />MSD 17.596 0.4 20 75 - 1257.3435 10.204 1002501214-01 mg/L 8 <br />Dissolved Potassium DUP 3.7848 0.0 203.78662501214-01 mg/L 6 <br />MS 14.261 75 - 1253.7866 10.204 1032501214-01 mg/L 7 <br />MSD 14.257 0.0 20 75 - 1253.7866 10.204 1032501214-01 mg/L 8 <br />QC Batch ID: B205054 Used client sample: N <br />Total Dissolved Solids @ 180 C DUP 513.33 4.0 10493.332501172-05 mg/L 9 <br />QC Batch ID: B205105 Used client sample: Y - Description: G-13, 01/22/2025 11:50 <br />Chemical Oxygen Demand DUP ND 20ND2501242-01 mg O2/L 10 <br />MS 887.08 80 - 120ND882.35 1012501242-01 mg O2/L 11 <br />MSD 892.15 0.6 20 80 - 120ND882.35 1012501242-01 mg O2/L 12 <br />The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. <br />All results listed in this report are for the exclusive use of the submitting party. Pace Analytical assumes no responsibility for report alteration, separation, detachment or third party interpretation. <br />4100 Atlas Court Bakersfield, CA 93308 (661) 327-4911 FAX (661) 327-1918 www.pacelabs.com Page 26 of 28Report ID: 1001569791