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C ace Analytical ENVIRONMENTAL SCIENCES Arcadis-SLO Reported: 04/13/2026 11:37 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: B226735 Used client sample: N Chloride DUP 2601856-02 63.192 63.489 mg/L 0.5 10 1 MS 2601856-02 63.192 116.47 50.505 mg/L 105 80-120 2 MSD 2601856-02 63.192 116.50 50.505 mg/L 0.0 106 10 80-120 3 Nitrate as N DUP 2601856-02 0.72820 0.73220 mg/L 0.5 10 1 MS 2601856-02 0.72820 5.8036 5.0505 mg/L 100 80-120 2 MSD 2601856-02 0.72820 5.8122 5.0505 mg/L 0.1 101 10 80-120 3 Sulfate DUP 2601856-02 52.039 52.450 mg/L 0.8 10 1 MS 2601856-02 52.039 169.11 101.01 mg/L 116 80-120 2 MSD 2601856-02 52.039 167.01 101.01 mg/L 1.2 114 10 80-120 3 QC Batch ID: B226896 Used client sample: N Dissolved Sulfide DUP 2601898-16 ND ND mg/L 10 4 MS 2601898-16 ND 0.50667 0.50000 mg/L 101 80-120 5 MSD 2601898-16 ND 0.49461 0.50000 mg/L 2.4 98.9 10 80-120 6 QC Batch ID: B227024 Used client sample: N Dissolved Calcium DUP 2601989-01 96.524 96.480 mg/L 0.0 20 7 MS 2601989-01 96.524 106.14 10.204 mg/L 94.2 75-125 8 MSD 2601989-01 96.524 106.16 10.204 mg/L 0.0 94.5 20 75-125 9 Dissolved Magnesium DUP 2601989-01 48.745 48.641 mg/L 0.2 20 7 MS 2601989-01 48.745 59.633 10.204 mg/L 107 75-125 8 MSD 2601989-01 48.745 59.651 10.204 mg/L 0.0 107 20 75-125 9 Dissolved Sodium DUP 2601989-01 37.013 37.137 mg/L 0.3 20 7 MS 2601989-01 37.013 47.527 10.204 mg/L 103 75-125 8 MSD 2601989-01 37.013 47.349 10.204 mg/L 0.4 101 20 75-125 9 Dissolved Potassium DUP 2601989-01 7.8423 7.8729 mg/L 0.4 20 7 MS 2601989-01 7.8423 18.227 10.204 mg/L 102 75-125 8 MSD 2601989-01 7.8423 18.211 10.204 mg/L 0.1 102 20 75-125 9 QC Batch ID: B227115 Used client sample: N Bicarbonate DUP 2601948-01 44.699 46.747 mg/L 4.5 10 10 Carbonate DUP 2601948-01 ND ND mg/L 10 10 QC Batch ID: B227367 Used client sample: N Dissolved Cyanide DUP 2602165-02 ND ND mg/L 10 11 MS 2602165-02 ND 0.096844 0.10000 mg/L 96.8 90-110 12 MSD 2602165-02 ND 0.098743 0.10000 mg/L 1.9 98.7 20 90-110 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: 1001665326 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 37 of 44