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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/13/2026 13:59 4119 Broad Street Suite 210 Project: Forward Landfill-COELT San Luis Obispo,CA 93401 Project Number: 30274343.01 Forward Landfill 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: B226564 Used client sample: Y-Description: MW-23R, 02/02/2026 10:53 Chloride DUP 2601615-01 38.892 38.698 mg/L 0.5 10 1 MS 2601615-01 38.892 149.40 101.01 mg/L 109 80-120 2 MSD 2601615-01 38.892 149.44 101.01 mg/L 0.0 109 10 80-120 3 Nitrate as N DUP 2601615-01 23.394 23.392 mg/L 0.0 10 1 MS 2601615-01 23.394 33.451 10.101 mg/L 99.6 80-120 2 MSD 2601615-01 23.394 33.366 10.101 mg/L 0.3 98.7 10 80-120 3 Sulfate DUP 2601615-01 68.160 68.450 mg/L 0.4 10 1 MS 2601615-01 68.160 287.19 202.02 mg/L 108 80-120 2 MSD 2601615-01 68.160 286.72 202.02 mg/L 0.2 108 10 80-120 3 QC Batch ID: B226579 Used client sample: N Chloride DUP 2601624-01 41.333 41.324 mg/L 0.0 10 4 MS 2601624-01 41.333 94.532 50.505 mg/L 105 80-120 5 MSD 2601624-01 41.333 94.412 50.505 mg/L 0.1 105 10 80-120 6 Nitrate as NO3 DUP 2601624-01 6.8652 6.8607 mg/L 0.1 10 4 MS 2601624-01 6.8652 29.660 22.358 mg/L 102 80-120 5 MSD 2601624-01 6.8652 29.643 22.358 mg/L 0.1 102 10 80-120 6 Nitrate as N DUP 2601624-01 1.5511 1.5501 mg/L 0.1 10 4 MS 2601624-01 1.5511 6.7012 5.0505 mg/L 102 80-120 5 MSD 2601624-01 1.5511 6.6975 5.0505 mg/L 0.1 102 10 80-120 6 Sulfate DUP 2601624-01 399.76 399.43 mg/L 0.1 10 4 MS 2601624-01 399.76 489.72 101.01 mg/L 89.1 80-120 5 MSD 2601624-01 399.76 489.62 101.01 mg/L 0.0 89.0 10 80-120 6 Nitrite as NO2 DUP 2601624-01 0.21707 0.22331 mg/L 2.8 10 4 MS 2601624-01 0.21707 3.8356 3.3182 mg/L 109 80-120 5 MSD 2601624-01 0.21707 3.8731 3.3182 mg/L 1.0 110 10 80-120 6 QC Batch ID: B226629 Used client sample: Y-Description: MW-23R, 02/02/2026 10:53 Dissolved Calcium DUP 2601615-01 83.679 83.919 mg/L 0.3 20 7 MS 2601615-01 83.679 93.731 10.204 mg/L 98.5 75-125 8 MSD 2601615-01 83.679 93.807 10.204 mg/L 0.1 99.3 20 75-125 9 Dissolved Magnesium DUP 2601615-01 31.020 30.973 mg/L 0.2 20 7 MS 2601615-01 31.020 40.012 10.204 mg/L 88.1 75-125 8 MSD 2601615-01 31.020 40.216 10.204 mg/L 0.5 90.1 20 75-125 9 Dissolved Sodium DUP 2601615-01 47.922 47.856 mg/L 0.1 20 7 MS 2601615-01 47.922 56.917 10.204 mg/L 88.2 75-125 8 MSD 2601615-01 47.922 56.620 10.204 mg/L 0.5 85.2 20 75-125 9 Dissolved Potassium DUP 2601615-01 3.2620 3.3703 mg/L 3.3 20 7 MS 2601615-01 3.2620 12.602 10.204 mg/L 91.5 75-125 8 MSD 2601615-01 3.2620 12.642 10.204 mg/L 0.3 91.9 20 75-125 9 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: 1001665505 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 82 of 87