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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/13/2026 15:17 4119 Broad Street Suite 210 Project: Forward Landfill-COELT San Luis Obispo,CA 93401 Project Number: 30274343.01 1 Q26 Extraction Wells 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: B226770 Used client sample: N Chloride DUP 2601891-01 103.35 103.26 mg/L 0.1 10 1 MS 2601891-01 103.35 153.03 50.505 mg/L 98.4 80-120 2 MSD 2601891-01 103.35 152.96 50.505 mg/L 0.0 98.2 10 80-120 3 Nitrate as N DUP 2601891-01 7.9439 7.9393 mg/L 0.1 10 1 MS 2601891-01 7.9439 13.007 5.0505 mg/L 100 80-120 2 MSD 2601891-01 7.9439 13.011 5.0505 mg/L 0.0 100 10 80-120 3 Sulfate DUP 2601891-01 40.443 40.426 mg/L 0.0 10 1 MS 2601891-01 40.443 150.65 101.01 mg/L 109 80-120 2 MSD 2601891-01 40.443 150.61 101.01 mg/L 0.0 109 10 80-120 3 QC Batch ID: B226887 Used client sample: N Dissolved Calcium DUP 2601787-07 296.19 297.34 mg/L 0.4 20 4 MS 2601787-07 296.19 306.73 10.204 mg/L 103 75-125 5 MSD 2601787-07 296.19 309.64 10.204 mg/L 0.9 132 20 75-125 A03 6 Dissolved Magnesium DUP 2601787-07 44.981 44.893 mg/L 0.2 20 4 MS 2601787-07 44.981 55.015 10.204 mg/L 98.3 75-125 5 MSD 2601787-07 44.981 55.008 10.204 mg/L 0.0 98.3 20 75-125 6 Dissolved Sodium DUP 2601787-07 302.23 303.40 mg/L 0.4 20 4 MS 2601787-07 302.23 313.04 10.204 mg/L 106 75-125 5 MSD 2601787-07 302.23 312.63 10.204 mg/L 0.1 102 20 75-125 6 Dissolved Potassium DUP 2601787-07 16.246 16.293 mg/L 0.3 20 4 MS 2601787-07 16.246 26.894 10.204 mg/L 104 75-125 5 MSD 2601787-07 16.246 27.025 10.204 mg/L 0.5 106 20 75-125 6 QC Batch ID: B227055 Used client sample: N Bicarbonate DUP 2601896-01 139.86 142.08 mg/L 1.6 10 7 Carbonate DUP 2601896-01 ND ND mg/L 10 7 Run Run# QC Sample ID QC Type Method Prep Date Date Time Analyst Instrument Dilution 1 B226770-DUP1 DUP EPA-300.0 02/05/26 02/05/26 23:28 OAE IC9 1 2 B226770-MS1 MS EPA-300.0 02/05/26 02/05/26 23:41 OAE IC9 1.010 3 B226770-MSD1 MSD EPA-300.0 02/05/26 02/05/26 23:55 OAE IC9 1.010 4 B226887-DUP1 DUP EPA-6010B 02/09/26 02/09/2618:11 JEH ICP6 1 5 B226887-MS1 MS EPA-6010B 02/09/26 02/09/2618:15 JEH ICP6 1.020 6 B226887-MSD1 MSD EPA-6010B 02/09/26 02/09/2618:16 JEH ICP6 1.020 7 B227055-DUP1 DUP EPA-310.1 02/11/26 02/11/2614:28 JMH2 MET-1 2 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: 1001665559 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 35 of 39