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C <br /> ace Analytical <br /> ENVIRONMENTAL SCIENCES <br /> Arcadis-SLO Reported: 02/20/2026 12:29 <br /> 4119 Broad Street Suite 210 Project: Forward Landfill-COELT <br /> San Luis Obispo,CA 93401 Project Number: 30274343.01 1Q26 Groundwater Monitoring Wells <br /> Project Manager: Dalia Rumani <br /> Water Analysis (General Chemistry) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent Lab <br /> Constituent Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals R# <br /> QC Batch ID: B226813 Used client sample: N <br /> Chloride DUP 2601903-01 1.3963 1.4004 mg/L 0.3 10 1 <br /> MS 2601903-01 1.3963 52.737 50.000 mg/L 103 80-120 2 <br /> MSD 2601903-01 1.3963 52.721 50.000 mg/L 0.0 103 10 80-120 3 <br /> Nitrate as N DUP 2601903-01 1.2374 1.2328 mg/L 0.4 10 1 <br /> MS 2601903-01 1.2374 6.3547 5.0000 mg/L 102 80-120 4 <br /> MSD 2601903-01 1.2374 6.3547 5.0000 mg/L 0 102 10 80-120 5 <br /> Sulfate DUP 2601903-01 ND ND mg/L 10 1 <br /> MS 2601903-01 ND 98.511 100.00 mg/L 98.5 80-120 2 <br /> MSD 2601903-01 ND 98.336 100.00 mg/L 0.2 98.3 10 80-120 5 <br /> QC Batch ID: B227024 Used client sample: Y-Description: AMW-33, 02/05/2026 17:18 <br /> Dissolved Calcium DUP 2601989-01 96.524 96.480 mg/L 0.0 20 6 <br /> MS 2601989-01 96.524 106.14 10.204 mg/L 94.2 75-125 7 <br /> MSD 2601989-01 96.524 106.16 10.204 mg/L 0.0 94.5 20 75-125 8 <br /> Dissolved Magnesium DUP 2601989-01 48.745 48.641 mg/L 0.2 20 6 <br /> MS 2601989-01 48.745 59.633 10.204 mg/L 107 75-125 7 <br /> MSD 2601989-01 48.745 59.651 10.204 mg/L 0.0 107 20 75-125 8 <br /> Dissolved Sodium DUP 2601989-01 37.013 37.137 mg/L 0.3 20 6 <br /> MS 2601989-01 37.013 47.527 10.204 mg/L 103 75-125 7 <br /> MSD 2601989-01 37.013 47.349 10.204 mg/L 0.4 101 20 75-125 8 <br /> Dissolved Potassium DUP 2601989-01 7.8423 7.8729 mg/L 0.4 20 6 <br /> MS 2601989-01 7.8423 18.227 10.204 mg/L 102 75-125 7 <br /> MSD 2601989-01 7.8423 18.211 10.204 mg/L 0.1 102 20 75-125 8 <br /> QC Batch ID: B227115 Used client sample: N <br /> Bicarbonate DUP 2601948-01 44.699 46.747 mg/L 4.5 10 9 <br /> Carbonate DUP 2601948-01 ND ND mg/L 10 9 <br /> QC Batch ID: B227116 Used client sample: Y- Description: AMW-33S, 02/05/2026 16:41 <br /> Bicarbonate DUP 2601989-02 341.86 325.35 mg/L 4.9 10 10 <br /> Carbonate DUP 2601989-02 ND ND mg/L 10 10 <br /> 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. <br /> 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. <br /> Report ID: 1001655038 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 29 of 34 <br />