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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 02/20/2026 12:20 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: Y-Description: CDCR-EW-4, 02/09/2026 12:46 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: B227024 Used client sample: N Dissolved Calcium DUP 2601989-01 96.524 96.480 mg/L 0.0 20 4 MS 2601989-01 96.524 106.14 10.204 mg/L 94.2 75-125 5 MSD 2601989-01 96.524 106.16 10.204 mg/L 0.0 94.5 20 75-125 6 Dissolved Magnesium DUP 2601989-01 48.745 48.641 mg/L 0.2 20 4 MS 2601989-01 48.745 59.633 10.204 mg/L 107 75-125 5 MSD 2601989-01 48.745 59.651 10.204 mg/L 0.0 107 20 75-125 6 Dissolved Sodium DUP 2601989-01 37.013 37.137 mg/L 0.3 20 4 MS 2601989-01 37.013 47.527 10.204 mg/L 103 75-125 5 MSD 2601989-01 37.013 47.349 10.204 mg/L 0.4 101 20 75-125 6 Dissolved Potassium DUP 2601989-01 7.8423 7.8729 mg/L 0.4 20 4 MS 2601989-01 7.8423 18.227 10.204 mg/L 102 75-125 5 MSD 2601989-01 7.8423 18.211 10.204 mg/L 0.1 102 20 75-125 6 QC Batch ID: B227196 Used client sample: N Bicarbonate DUP 2602014-07 862.16 876.64 mg/L 1.7 10 7 Carbonate DUP 2602014-07 ND ND mg/L 10 7 Run Run# QC Sample ID QC Type Method Prep Date Date Time Analyst Instrument Dilution 1 B226945-DUP1 DUP EPA-300.0 02/10/26 02/10/2611:38 PRE IC2 1 2 B226945-MS1 MS EPA-300.0 02/10/26 02/10/2611:58 PRE IC2 1.010 3 B226945-MSD1 MSD EPA-300.0 02/10/26 02/10/2612:19 PRE IC2 1.010 4 B227024-DUP1 DUP EPA-6010B 02/11/26 02/11/2610:24 NW1 ICP5 1 5 B227024-MS1 MS EPA-6010B 02/11/26 02/11/2610:27 NW1 ICP5 1.020 6 B227024-MSD1 MSD EPA-6010B 02/11/26 02/11/2610:29 NW1 ICP5 1.020 7 B227196-DUP1 DUP EPA-310.1 02/13/26 02/13/26 09:53 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: 1001655036 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 20 of 24