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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/13/2026 11:08 4119 Broad Street Suite 210 Project: Forward Landfill-COELT San Luis Obispo,CA 93401 Project Number: 30274343.01 Project Manager: Dalia Rumani Water Analysis (General Chemistry) Quality Control Report - Precision & Accuracy Control Limits Source Source Spike Percent Percent Lab Constituent Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals R# QC Batch ID: B226466 Used client sample: Y-Description: MW-3A, 01/30/2026 12:33 Chloride DUP 2601557-01 81.171 81.291 mg/L 0.1 10 1 MS 2601557-01 81.171 135.74 50.505 mg/L 108 80-120 2 MSD 2601557-01 81.171 135.97 50.505 mg/L 0.2 108 10 80-120 3 Nitrate as N DUP 2601557-01 11.427 11.415 mg/L 0.1 10 1 MS 2601557-01 11.427 16.790 5.0505 mg/L 106 80-120 2 MSD 2601557-01 11.427 16.819 5.0505 mg/L 0.2 107 10 80-120 3 Sulfate DUP 2601557-01 59.713 59.828 mg/L 0.2 10 1 MS 2601557-01 59.713 173.52 101.01 mg/L 113 80-120 2 MSD 2601557-01 59.713 174.10 101.01 mg/L 0.3 113 10 80-120 3 QC Batch ID: B226547 Used client sample: Y-Description: MW-3A, 01/30/2026 12:33 Dissolved Calcium DUP 2601557-01 101.89 101.73 mg/L 0.2 20 4 MS 2601557-01 101.89 114.39 10.204 mg/L 123 75-125 5 MSD 2601557-01 101.89 114.11 10.204 mg/L 0.2 120 20 75-125 6 Dissolved Magnesium DUp 2601557-01 45.089 45.313 mg/L 0.5 20 4 MS 2601557-01 45.089 56.464 10.204 mg/L ill 75-125 5 MSD 2601557-01 45.089 56.312 10.204 mg/L 0.3 110 20 75-125 6 Dissolved Sodium DUP 2601557-01 44.344 44.520 mg/L 0.4 20 4 MS 2601557-01 44.344 55.592 10.204 mg/L 110 75-125 5 MSD 2601557-01 44.344 55.583 10.204 mg/L 0.0 110 20 75-125 6 Dissolved Potassium DUP 2601557-01 7.9353 7.9616 mg/L 0.3 20 4 MS 2601557-01 7.9353 18.599 10.204 mg/L 105 75-125 5 MSD 2601557-01 7.9353 18.683 10.204 mg/L 0.4 105 20 75-125 6 QC Batch ID: B226703 Used client sample: Y-Description: MW-3A, 01/30/2026 12:33 Bicarbonate DUP 2601557-01 445.37 444.07 mg/L 0.3 10 7 Carbonate DUP 2601557-01 ND ND mg/L 10 7 Total Alkalinity as CaCO3 DUP 2601557-01 365.27 364.21 mg/L 0.3 10 7 QC Batch ID: B226704 Used client sample: Y-Description: AMW-31 S, 01/30/2026 15:47 Bicarbonate DUP 2601557-12 420.14 397.88 mg/L 5.4 10 8 Carbonate DUP 2601557-12 ND ND mg/L 10 8 Total Alkalinity as CaCO3 DUP 2601557-12 344.58 326.32 mg/L 5.4 10 8 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. 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. Report ID: 1001665296 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 79 of 84