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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/14/2026 12:02 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: B226623 Used client sample: N Chloride DUP 2601717-01 6.2120 6.1090 mg/L 1.7 10 1 MS 2601717-01 6.2120 59.761 50.505 mg/L 106 80-120 2 MSD 2601717-01 6.2120 59.667 50.505 mg/L 0.2 106 10 80-120 3 Nitrate as N DUP 2601717-01 3.9810 3.9820 mg/L 0.0 10 1 MS 2601717-01 3.9810 9.0909 5.0505 mg/L 101 80-120 2 MSD 2601717-01 3.9810 9.0242 5.0505 mg/L 0.7 99.9 10 80-120 3 Sulfate DUP 2601717-01 16.001 15.877 mg/L 0.8 10 1 MS 2601717-01 16.001 122.62 101.01 mg/L 106 80-120 2 MSD 2601717-01 16.001 122.04 101.01 mg/L 0.5 105 10 80-120 3 QC Batch ID: B226636 Used client sample: Y-Description: AMW-56, 02/03/2026 13:23 Chloride DUP 2601733-05 25.119 25.653 mg/L 2.1 10 4 MS 2601733-05 25.119 81.055 50.505 mg/L ill 80-120 5 MSD 2601733-05 25.119 82.765 50.505 mg/L 2.1 114 10 80-120 6 Nitrate as N DUp 2601733-05 1.1240 1.1510 mg/L 2.4 10 4 MS 2601733-05 1.1240 6.5293 5.0505 mg/L 107 80-120 5 MSD 2601733-05 1.1240 6.6424 5.0505 mg/L 1.7 109 10 80-120 6 Sulfate DUP 2601733-05 25.255 25.920 mg/L 2.6 10 4 MS 2601733-05 25.255 136.74 101.01 mg/L 110 80-120 5 MSD 2601733-05 25.255 138.47 101.01 mg/L 1.3 112 10 80-120 6 QC Batch ID: B226693 Used client sample: Y-Description: MW-16, 02/03/2026 10:21 Dissolved Calcium DUP 2601733-01 133.81 134.50 mg/L 0.5 20 7 MS 2601733-01 133.81 145.15 10.204 mg/L ill 75-125 8 MSD 2601733-01 133.81 145.56 10.204 mg/L 0.3 115 20 75-125 9 Dissolved Magnesium DUP 2601733-01 73.294 73.277 mg/L 0.0 20 7 MS 2601733-01 73.294 84.869 10.204 mg/L 113 75-125 8 MSD 2601733-01 73.294 84.924 10.204 mg/L 0.1 114 20 75-125 9 Dissolved Sodium DUP 2601733-01 59.499 60.198 mg/L 1.2 20 7 MS 2601733-01 59.499 71.089 10.204 mg/L 114 75-125 8 MSD 2601733-01 59.499 71.687 10.204 mg/L 0.8 119 20 75-125 9 Dissolved Potassium DUP 2601733-01 8.6967 8.7654 mg/L 0.8 20 7 MS 2601733-01 8.6967 19.428 10.204 mg/L 105 75-125 8 MSD 2601733-01 8.6967 19.460 10.204 mg/L 0.2 105 20 75-125 9 QC Batch ID: B226868 Used client sample: N Bicarbonate DUP 2601719-02 173.06 173.43 mg/L 0.2 10 10 Carbonate DUP 2601719-02 ND ND mg/L 10 10 Total Alkalinity as CaCO3 DUP 2601719-02 141.94 142.24 mg/L 0.2 10 10 QC Batch ID: B226869 Used client sample: Y-Description: AMW-1, 02/03/2026 10:11 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: 1001665842 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 101 of 109