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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:02/07/2025 16:06 <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: B202441 Used client sample: N <br />Bicarbonate DUP 194.39 1.6 10191.242501271-02 mg/L 1 <br />Carbonate Alkalinity as CaCO3 DUP ND 10ND2501271-02 mg/L 1 <br />Total Alkalinity as CaCO3 DUP 159.43 1.6 10156.852501271-02 mg/L 1 <br />QC Batch ID: B202442 Used client sample: Y - Description: G-12, 01/23/2025 12:10 <br />Bicarbonate DUP 138.19 0.8 10137.082501328-05 mg/L 2 <br />Carbonate Alkalinity as CaCO3 DUP ND 10ND2501328-05 mg/L 2 <br />Total Alkalinity as CaCO3 DUP 113.34 0.8 10112.432501328-05 mg/L 2 <br />QC Batch ID: B204959 Used client sample: Y - Description: G-7, 01/23/2025 14:35 <br />Chloride DUP 7.8830 0.2 107.89702501328-01 mg/L 3 <br />MS 61.631 80 - 1207.8970 50.505 1062501328-01 mg/L 4 <br />MSD 61.910 0.5 10 80 - 1207.8970 50.505 1072501328-01 mg/L 5 <br />Nitrate as N DUP 2.0470 0.0 102.04802501328-01 mg/L 3 <br />MS 7.2263 80 - 1202.0480 5.0505 1032501328-01 mg/L 4 <br />MSD 7.2566 0.4 10 80 - 1202.0480 5.0505 1032501328-01 mg/L 5 <br />Sulfate DUP 3.1700 1.9 103.23002501328-01 mg/L 3 <br />MS 107.26 80 - 1203.2300 101.01 1032501328-01 mg/L 4 <br />MSD 107.15 0.1 10 80 - 1203.2300 101.01 1032501328-01 mg/L 5 <br />QC Batch ID: B205012 Used client sample: Y - Description: G-9, 01/23/2025 10:10 <br />Dissolved Calcium DUP 17.414 0.3 2017.4692501328-03 mg/L 6 <br />MS 28.772 75 - 12517.469 10.204 1112501328-03 mg/L 7 <br />MSD 28.717 0.2 20 75 - 12517.469 10.204 1102501328-03 mg/L 8 <br />Dissolved Magnesium DUP 9.2907 0.5 209.33702501328-03 mg/L 6 <br />MS 20.661 75 - 1259.3370 10.204 1112501328-03 mg/L 7 <br />MSD 20.655 0.0 20 75 - 1259.3370 10.204 1112501328-03 mg/L 8 <br />Dissolved Sodium DUP 16.096 0.4 2016.0292501328-03 mg/L 6 <br />MS 26.717 75 - 12516.029 10.204 1052501328-03 mg/L 7 <br />MSD 26.795 0.3 20 75 - 12516.029 10.204 1062501328-03 mg/L 8 <br />Dissolved Potassium DUP 3.3959 0.1 203.39162501328-03 mg/L 6 <br />MS 14.856 75 - 1253.3916 10.204 1122501328-03 mg/L 7 <br />MSD 14.800 0.4 20 75 - 1253.3916 10.204 1122501328-03 mg/L 8 <br />QC Batch ID: B205105 Used client sample: N <br />Chemical Oxygen Demand DUP ND 20ND2501242-01 mg O2/L 9 <br />MS 887.08 80 - 120ND882.35 1012501242-01 mg O2/L 10 <br />MSD 892.15 0.6 20 80 - 120ND882.35 1012501242-01 mg O2/L 11 <br />QC Batch ID: B205106 Used client sample: Y - Description: G-8, 01/23/2025 13:15 <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 52 of 54Report ID: 1001568851