2025-06-23_REVISION - M1980244 (28)

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Existing Numeric Protection Limits(NPLs) Reg.41 Table 411111 GVMW- CRMW- Sitewide Value Description 8A 3B VIN-2B WCMW-3 WCMW-6 NPL Standard (Existing) Aluminum (dis)(mg/L) 7 5 Antimony(dis)(mg/L) 0.006 Arsenic(dis)(mg/L) 0.01 Barium(dis) (mg/L) 2 Beryllium (dis)(mg/L) 0.004 Boron(dis) (mg/L) 0.75 Cadmium(dis)(mg/L) 0.005 0.005 Chloride(dis)(mg/L) 250 Chromium(dis) (mg/L) 0.1 Cobalt(dis)(mg/L) 0.05 Copper(dis)(mg/L) 0.2 0.2 Cyanide[Free] (mg/L) 0.2 Cyanide[WAD] (mg/L) 0.2 Fluoride(mg/L) 2 2 Iron (dis)(mg/L) 14 0.3 Lead (dis) (mg/L) 0.05 Lithium(dis) (mg/L) 2.5 Manganese(dis) (mg/L) 1 8.1 4 0.5 0.2 3 0.05 IIIMercury(dis)(mg/L) 0.002 0.002 Molybdenum(dis)(mg/L) 0.21 Nickel(dis) (mg/L) 0.2 0.1 Nitrate as Nitrogen (mg/L) 10 10 Nitrite as Nitrogen (mg/L) 1 1 Nitrate+ Nitrite as Nitrogen (mg/L) 11 10 pH Field-Upper 8.5 9 8.5 9 8.5 8.5 8.5 pH Field-Lower 6.5 6 6.5 6 6.5 6 6.5 Selenium (dis)(mg/L) 0.024 0.02 Silver(dis)(mg/L) 0.05 Sulfate(mg/L) 250 1070 800 250 250 250 Thallium(dis)(mg/L) 0.002 Uranium(dis)(mg/L) 0.03 Vanadium(dis)(mg/L) 0.1 Zinc(dis)(mg/L) 2 2 Notes: If no NPL exists(Sitewide or well-specific)for that parameter,the most stringent value from Colorado Regulation 41 Tables 1, 2,or 3 is applied. Acronyms: dis-dissolved I . SSR Mining Inc. PAGE 2/4