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C <br /> ace Analytical <br /> ENVIRONMENTAL SCIENCES <br /> Arcadis-SLO Reported: 04/13/2026 15:17 <br /> 4119 Broad Street Suite 210 Project: Forward Landfill-COELT <br /> San Luis Obispo,CA 93401 Project Number: 30274343.01 1 Q26 Extraction Wells <br /> Project Manager: Dalia Rumani <br /> Metals Analysis <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: B226887 Used client sample: N <br /> Dissolved Strontium DUP 2601787-07 872.30 877.00 ug/L 0.5 20 1 <br /> MS 2601787-07 872.30 1400.0 510.20 ug/L 103 75-125 2 <br /> MSD 2601787-07 872.30 1407.6 510.20 ug/L 0.5 105 20 75-125 3 <br /> Run <br /> Run# QC Sample ID QC Type Method Prep Date Date Time Analyst Instrument Dilution <br /> 1 B226887-DUP1 DUP EPA-6010B 02/09/26 02/09/2618:11 JEH ICP6 1 <br /> 2 B226887-MS1 MS EPA-6010B 02/09/26 02/09/2618:15 JEH ICP6 1.020 <br /> 3 B226887-MSD1 MSD EPA-6010B 02/09/26 02/09/2618:16 JEH ICP6 1.020 <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: 1001665559 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 38 of 39 <br />