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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/14/2026 11:46 4119 Broad Street Suite 210 Project: Forward Landfill-COELT San Luis Obispo,CA 93401 Project Number: 30274343.01 1Q26 Groundwater Monitoring 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: B226784 Used client sample: Y-Description: AMW-28, 02/05/2026 08:01 Chloride DUP 2601898-01 59.728 58.968 mg/L 1.3 10 A10 1 MS 2601898-01 59.728 172.27 101.01 mg/L ill 80-120 A10 2 MSD 2601898-01 59.728 171.55 101.01 mg/L 0.4 ill 10 80-120 A10 3 Nitrate as N DUP 2601898-01 22.396 22.356 mg/L 0.2 10 A10 1 MS 2601898-01 22.396 32.875 10.101 mg/L 104 80-120 A10 2 MSD 2601898-01 22.396 32.830 10.101 mg/L 0.1 103 10 80-120 A10 3 Sulfate DUP 2601898-01 47.674 47.530 mg/L 0.3 10 A10 1 MS 2601898-01 47.674 263.57 202.02 mg/L 107 80-120 A10 2 MSD 2601898-01 47.674 263.46 202.02 mg/L 0.0 107 10 80-120 A10 3 QC Batch ID: B226785 Used client sample: Y-Description: 7833-MW-04,02/05/2026 10:04 Chloride DUP 2601898-13 92.090 91.786 mg/L 0.3 10 4 MS 2601898-13 92.090 143.51 50.505 mg/L 102 80-120 5 MSD 2601898-13 92.090 145.45 50.505 mg/L 1.3 106 10 80-120 6 Nitrate as N DUP 2601898-13 16.005 15.978 mg/L 0.2 10 4 MS 2601898-13 16.005 20.973 5.0505 mg/L 98.4 80-120 5 MSD 2601898-13 16.005 20.933 5.0505 mg/L 0.2 97.6 10 80-120 6 Sulfate DUP 2601898-13 31.100 30.973 mg/L 0.4 10 4 MS 2601898-13 31.100 139.31 101.01 mg/L 107 80-120 5 MSD 2601898-13 31.100 138.66 101.01 mg/L 0.5 106 10 80-120 6 QC Batch ID: B226888 Used client sample: Y-Description: AMW-2, 02/05/2026 13:00 Dissolved Calcium DUP 2601898-16 46.867 46.710 mg/L 0.3 20 7 MS 2601898-16 46.867 57.009 10.204 mg/L 99.4 75-125 8 MSD 2601898-16 46.867 56.765 10.204 mg/L 0.4 97.0 20 75-125 9 Dissolved Magnesium DUP 2601898-16 19.980 19.872 mg/L 0.5 20 7 MS 2601898-16 19.980 29.939 10.204 mg/L 97.6 75-125 8 MSD 2601898-16 19.980 29.868 10.204 mg/L 0.2 96.9 20 75-125 9 Dissolved Sodium DUP 2601898-16 37.594 37.402 mg/L 0.5 20 7 MS 2601898-16 37.594 47.335 10.204 mg/L 95.5 75-125 8 MSD 2601898-16 37.594 47.384 10.204 mg/L 0.1 95.9 20 75-125 9 Dissolved Potassium DUP 2601898-16 5.9095 5.8952 mg/L 0.2 20 7 MS 2601898-16 5.9095 16.291 10.204 mg/L 102 75-125 8 MSD 2601898-16 5.9095 16.404 10.204 mg/L 0.7 103 20 75-125 9 QC Batch ID: B226896 Used client sample: Y-Description: AMW-2, 02/05/2026 13:00 Dissolved Sulfide DUP 2601898-16 ND ND mg/L 10 10 MS 2601898-16 ND 0.50667 0.50000 mg/L 101 80-120 11 MSD 2601898-16 ND 0.49461 0.50000 mg/L 2.4 98.9 10 80-120 12 QC Batch ID: B227055 Used client sample: N Bicarbonate DUP 2601896-01 139.86 142.08 mg/L 1.6 10 13 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 1001665835 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 110 of 116