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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 02/13/2026 16:34 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: B226354 Used client sample: Y-Description: AMW-57S, 01/28/2026 11:06 Chloride DUP 2601426-01 6.2080 6.1860 mg/L 0.4 10 1 MS 2601426-01 6.2080 60.061 50.505 mg/L 107 80-120 2 MSD 2601426-01 6.2080 60.341 50.505 mg/L 0.5 107 10 80-120 3 Nitrate as N DUP 2601426-01 0.77800 0.77400 mg/L 0.5 10 1 MS 2601426-01 0.77800 5.9596 5.0505 mg/L 103 80-120 2 MSD 2601426-01 0.77800 5.9677 5.0505 mg/L 0.1 103 10 80-120 3 Sulfate DUP 2601426-01 21.287 21.117 mg/L 0.8 10 1 MS 2601426-01 21.287 130.63 101.01 mg/L 108 80-120 2 MSD 2601426-01 21.287 130.07 101.01 mg/L 0.4 108 10 80-120 3 QC Batch ID: B226355 Used client sample: Y-Description: AMW-41 M, 01/28/2026 14:29 Chloride DUP 2601426-12 8.1750 8.1370 mg/L 0.5 10 4 MS 2601426-12 8.1750 61.194 50.505 mg/L 105 80-120 5 MSD 2601426-12 8.1750 61.779 50.505 mg/L 1.0 106 10 80-120 6 Nitrate as N DUP 2601426-12 0.57800 0.57300 mg/L 0.9 10 4 MS 2601426-12 0.57800 5.6051 5.0505 mg/L 99.5 80-120 5 MSD 2601426-12 0.57800 5.6495 5.0505 mg/L 0.8 100 10 80-120 6 Sulfate DUP 2601426-12 17.025 16.940 mg/L 0.5 10 4 MS 2601426-12 17.025 122.95 101.01 mg/L 105 80-120 5 MSD 2601426-12 17.025 123.85 101.01 mg/L 0.7 106 10 80-120 6 QC Batch ID: B226452 Used client sample: Y-Description: AMW-57S, 01/28/2026 11:06 Dissolved Calcium DUP 2601426-01 40.019 39.482 mg/L 1.4 20 7 MS 2601426-01 40.019 49.973 10.204 mg/L 97.5 75-125 8 MSD 2601426-01 40.019 50.591 10.204 mg/L 1.2 104 20 75-125 9 Dissolved Magnesium DUP 2601426-01 18.992 19.000 mg/L 0.0 20 7 MS 2601426-01 18.992 29.233 10.204 mg/L 100 75-125 8 MSD 2601426-01 18.992 29.176 10.204 mg/L 0.2 99.8 20 75-125 9 Dissolved Sodium DUP 2601426-01 36.593 36.150 mg/L 1.2 20 7 MS 2601426-01 36.593 45.902 10.204 mg/L 91.2 75-125 8 MSD 2601426-01 36.593 46.602 10.204 mg/L 1.5 98.1 20 75-125 9 Dissolved Potassium DUP 2601426-01 4.2827 4.1903 mg/L 2.2 20 7 MS 2601426-01 4.2827 14.183 10.204 mg/L 97.0 75-125 8 MSD 2601426-01 4.2827 14.344 10.204 mg/L 1.1 98.6 20 75-125 9 QC Batch ID: B226484 Used client sample: N Bicarbonate DUP 2600760-01 ND ND mg/L 10 10 Carbonate DUP 2600760-01 240.44 250.29 mg/L 4.0 10 10 Total Alkalinity as CaCO3 DUP 2600760-01 722.93 736.63 mg/L 1.9 10 10 QC Batch ID: B226485 Used client sample: Y-Description: AMW-43S,01/28/2026 10:52 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: 1001653944 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 93 of 98