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C <br /> ace Analytical <br /> ENVIRONMENTAL SCIENCES <br /> Arcadis-SLO Reported: 02/20/2026 17:41 <br /> 4119 Broad Street Suite 210 Project: Forward Landfill-COELT <br /> San Luis Obispo,CA 93401 Project Number: 30274343.01 1 Q26 Surface Water <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: B226849 Used client sample: N <br /> Chloride DUP 2601968-01 13.475 13.462 mg/L 0.1 10 1 <br /> MS 2601968-01 13.475 67.040 50.505 mg/L 106 80-120 2 <br /> MSD 2601968-01 13.475 67.128 50.505 mg/L 0.1 106 10 80-120 3 <br /> Nitrate as N DUP 2601968-01 8.3018 8.2822 mg/L 0.2 10 1 <br /> MS 2601968-01 8.3018 13.321 5.0505 mg/L 99.4 80-120 2 <br /> MSD 2601968-01 8.3018 13.321 5.0505 mg/L 0.0 99.4 10 80-120 3 <br /> Sulfate DUP 2601968-01 28.829 28.727 mg/L 0.4 10 1 <br /> MS 2601968-01 28.829 137.75 101.01 mg/L 108 80-120 2 <br /> MSD 2601968-01 28.829 137.78 101.01 mg/L 0.0 108 10 80-120 3 <br /> QC Batch ID: B227024 Used client sample: N <br /> Dissolved Calcium DUP 2601989-01 96.524 96.480 mg/L 0.0 20 4 <br /> MS 2601989-01 96.524 106.14 10.204 mg/L 94.2 75-125 5 <br /> MSD 2601989-01 96.524 106.16 10.204 mg/L 0.0 94.5 20 75-125 6 <br /> Dissolved Magnesium DUP 2601989-01 48.745 48.641 mg/L 0.2 20 4 <br /> MS 2601989-01 48.745 59.633 10.204 mg/L 107 75-125 5 <br /> MSD 2601989-01 48.745 59.651 10.204 mg/L 0.0 107 20 75-125 6 <br /> Dissolved Sodium DUP 2601989-01 37.013 37.137 mg/L 0.3 20 4 <br /> MS 2601989-01 37.013 47.527 10.204 mg/L 103 75-125 5 <br /> MSD 2601989-01 37.013 47.349 10.204 mg/L 0.4 101 20 75-125 6 <br /> Dissolved Potassium DUP 2601989-01 7.8423 7.8729 mg/L 0.4 20 4 <br /> MS 2601989-01 7.8423 18.227 10.204 mg/L 102 75-125 5 <br /> MSD 2601989-01 7.8423 18.211 10.204 mg/L 0.1 102 20 75-125 6 <br /> QC Batch ID: B227117 Used client sample: Y-Description: ASW-1, 02/06/2026 12:54 <br /> Bicarbonate DUP 2601991-01 66.780 67.890 mg/L 1.6 10 7 <br /> Carbonate DUp 2601991-01 3.4655 4.3769 mg/L 23.2 10 001 7 <br /> QC Batch ID: B227127 Used client sample: N <br /> Total Suspended Solids(Glass DUP 2601881-03 25.250 25.500 mg/L 1.0 10 8 <br /> Fiber) <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: 1001655256 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 29 of 31 <br />