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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/10/2026 15:35 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: B226945 Used client sample: N Chloride DUP 2602030-01 27.055 27.036 mg/L 0.1 10 1 MS 2602030-01 27.055 85.026 50.505 mg/L 115 80-120 2 MSD 2602030-01 27.055 84.758 50.505 mg/L 0.3 114 10 80-120 3 Nitrate as N DUP 2602030-01 4.7840 4.7960 mg/L 0.3 10 1 MS 2602030-01 4.7840 10.195 5.0505 mg/L 107 80-120 2 MSD 2602030-01 4.7840 10.209 5.0505 mg/L 0.1 107 10 80-120 3 Sulfate DUP 2602030-01 41.021 41.281 mg/L 0.6 10 1 MS 2602030-01 41.021 155.25 101.01 mg/L 113 80-120 2 MSD 2602030-01 41.021 154.93 101.01 mg/L 0.2 113 10 80-120 3 QC Batch ID: B226946 Used client sample: Y-Description: D-01 N, 02/09/2026 12:35 Chloride DUP 2602031-15 1522.6 1517.7 mg/L 0.3 10 4 MS 2602031-15 1522.6 1965.2 505.05 mg/L 87.6 80-120 5 MSD 2602031-15 1522.6 1957.1 505.05 mg/L 0.4 86.0 10 80-120 6 Nitrate as N DUP 2602031-15 ND ND mg/L 10 4 MS 2602031-15 ND 53.293 50.505 mg/L 106 80-120 5 MSD 2602031-15 ND 52.687 50.505 mg/L 1.1 104 10 80-120 6 Sulfate DUP 2602031-15 29.490 28.480 mg/L 3.5 10 4 MS 2602031-15 29.490 1110.7 1010.1 mg/L 107 80-120 5 MSD 2602031-15 29.490 1118.0 1010.1 mg/L 0.7 108 10 80-120 6 QC Batch ID: B226973 Used client sample: N Dissolved Sulfide DUP 2601733-13 ND ND mg/L 10 7 MS 2601733-13 ND 0.50237 0.50000 mg/L 100 80-120 8 MSD 2601733-13 ND 0.50828 0.50000 mg/L 1.2 102 10 80-120 9 QC Batch ID: B226974 Used client sample: N Dissolved Sulfide DUP 2601733-14 ND ND mg/L 10 10 MS 2601733-14 ND 0.48464 0.50000 mg/L 96.9 80-120 11 MSD 2601733-14 ND 0.49055 0.50000 mg/L 1.2 98.1 10 80-120 12 QC Batch ID: B227026 Used client sample: Y-Description: AMW-22, 02/09/2026 09:13 Dissolved Calcium DUP 2602031-01 72.048 71.824 mg/L 0.3 20 13 MS 2602031-01 72.048 80.740 10.204 mg/L 85.2 75-125 14 MSD 2602031-01 72.048 80.893 10.204 mg/L 0.2 86.7 20 75-125 15 Dissolved Magnesium DUP 2602031-01 31.949 32.213 mg/L 0.8 20 13 MS 2602031-01 31.949 40.779 10.204 mg/L 86.5 75-125 14 MSD 2602031-01 31.949 40.880 10.204 mg/L 0.2 87.5 20 75-125 15 Dissolved Sodium DUP 2602031-01 37.345 37.389 mg/L 0.1 20 13 MS 2602031-01 37.345 46.658 10.204 mg/L 91.3 75-125 14 MSD 2602031-01 37.345 46.582 10.204 mg/L 0.2 90.5 20 75-125 15 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: 1001665034 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 139 of 147