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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-Leachate Sampling <br />631038217 <br />Sandra Pimienta <br />Reported:02/04/2025 10:07 <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 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: B204880 Used client sample: N <br />Chloride DUP 119.44 0.8 10118.512501229-01 mg/L 2 <br />MS 225.34 80 - 120118.51 101.01 1062501229-01 mg/L 3 <br />MSD 225.83 0.2 10 80 - 120118.51 101.01 1062501229-01 mg/L 4 <br />Nitrate as N DUP 21.817 0.6 1021.6892501229-01 mg/L 2 <br />MS 31.891 80 - 12021.689 10.101 1012501229-01 mg/L 3 <br />MSD 31.954 0.2 10 80 - 12021.689 10.101 1022501229-01 mg/L 4 <br />Sulfate DUP 388.02 0.4 10386.432501229-01 mg/L 2 <br />MS 593.03 80 - 120386.43 202.02 1022501229-01 mg/L 3 <br />MSD 592.88 0.0 10 80 - 120386.43 202.02 1022501229-01 mg/L 4 <br />QC Batch ID: B204913 Used client sample: N <br />Chemical Oxygen Demand DUP 25.000 0 2025.0002501214-01 mg O2/L 5 <br />MS 932.12 80 - 12025.000 882.35 1032501214-01 mg O2/L 6 <br />MSD 922.10 1.1 20 80 - 12025.000 882.35 1022501214-01 mg O2/L 7 <br />QC Batch ID: B205030 Used client sample: N <br />Total Calcium DUP 5.0653 2.6 205.19622501256-01 mg/L 8 <br />MS 15.213 75 - 1255.1962 10.000 1002501256-01 mg/L 9 <br />MSD 15.394 1.2 20 75 - 1255.1962 10.000 1022501256-01 mg/L 10 <br />Total Magnesium DUP 0.66800 2.7 200.686302501256-01 mg/L 8 <br />MS 10.987 75 - 1250.68630 10.000 1032501256-01 mg/L 9 <br />MSD 11.242 2.3 20 75 - 1250.68630 10.000 1062501256-01 mg/L 10 <br />Total Sodium DUP 211.11 2.7 20216.832501256-01 mg/L 8 <br />MS 222.44 75 - 125216.83 10.000 56.1 A032501256-01 mg/L 9 <br />MSD 226.22 1.7 20 75 - 125216.83 10.000 93.92501256-01 mg/L 10 <br />Total Potassium DUP 2.5462 2.7 202.61682501256-01 mg/L 8 <br />MS 12.684 75 - 1252.6168 10.000 1012501256-01 mg/L 9 <br />MSD 12.871 1.5 20 75 - 1252.6168 10.000 1032501256-01 mg/L 10 <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 11 <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 38 of 40Report ID: 1001567776