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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/13/2026 15:13 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: B226433 Used client sample: N Nitrate as N DUP 2601497-01 8.8350 10.029 mg/L 12.7 10 A10,Q 1 01 MS 2601497-01 8.8350 19.075 10.101 mg/L 101 80-120 A10 2 MSD 2601497-01 8.8350 19.077 10.101 mg/L 0.0 101 10 80-120 A10 3 QC Batch ID: B226447 Used client sample: Y-Description: AMW-30, 01/29/2026 10:15 Chloride DUP 2601495-13 44.141 44.068 mg/L 0.2 10 4 MS 2601495-13 44.141 102.75 50.505 mg/L 116 80-120 5 MSD 2601495-13 44.141 102.71 50.505 mg/L 0.0 116 10 80-120 6 Nitrate as N DUP 2601495-13 6.7447 6.7411 mg/L 0.1 10 4 MS 2601495-13 6.7447 12.282 5.0505 mg/L 110 80-120 5 MSD 2601495-13 6.7447 12.277 5.0505 mg/L 0.0 110 10 80-120 6 Sulfate DUP 2601495-13 43.577 43.458 mg/L 0.3 10 4 MS 2601495-13 43.577 159.75 101.01 mg/L 115 80-120 5 MSD 2601495-13 43.577 159.44 101.01 mg/L 0.2 115 10 80-120 6 QC Batch ID: B226448 Used client sample: Y-Description: AMW-11, 01/29/2026 09:41 Chloride DUP 2601495-01 19.190 19.136 mg/L 0.3 10 7 MS 2601495-01 19.190 74.012 50.505 mg/L 109 80-120 8 MSD 2601495-01 19.190 75.351 50.505 mg/L 1.8 ill 10 80-120 9 Nitrate as N DUP 2601495-01 1.2350 1.2320 mg/L 0.2 10 7 MS 2601495-01 1.2350 6.6232 5.0505 mg/L 107 80-120 8 MSD 2601495-01 1.2350 6.6949 5.0505 mg/L 1.1 108 10 80-120 9 Sulfate DUP 2601495-01 28.186 28.080 mg/L 0.4 10 7 MS 2601495-01 28.186 139.89 101.01 mg/L ill 80-120 8 MSD 2601495-01 28.186 141.66 101.01 mg/L 1.3 112 10 80-120 9 QC Batch ID: B226477 Used client sample: Y-Description: AMW-11, 01/29/2026 09:41 Dissolved Calcium DUP 2601495-01 60.176 59.798 mg/L 0.6 20 10 MS 2601495-01 60.176 70.835 10.204 mg/L 104 75-125 11 MSD 2601495-01 60.176 70.183 10.204 mg/L 0.9 98.1 20 75-125 12 Dissolved Magnesium DUP 2601495-01 25.580 25.612 mg/L 0.1 20 10 MS 2601495-01 25.580 35.942 10.204 mg/L 102 75-125 11 MSD 2601495-01 25.580 35.925 10.204 mg/L 0.0 101 20 75-125 12 Dissolved Sodium DUP 2601495-01 40.378 40.279 mg/L 0.2 20 10 MS 2601495-01 40.378 50.628 10.204 mg/L 100 75-125 11 MSD 2601495-01 40.378 50.347 10.204 mg/L 0.6 97.7 20 75-125 12 Dissolved Potassium DUP 2601495-01 4.0477 4.0079 mg/L 1.0 20 10 MS 2601495-01 4.0477 14.829 10.204 mg/L 106 75-125 11 MSD 2601495-01 4.0477 14.660 10.204 mg/L 1.1 104 20 75-125 12 QC Batch ID: B226626 Used client sample: N 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: 1001665557 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 113 of 118