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• <br /> Table 3.5 Wilson Creek Surface Water Standards (COARUA23) <br /> 23.Mainstem of Wilson Creek(Teller County),including all tributaries and wetlands,from the source to the confluence with Foumiile Creek. <br /> COARUA23 Classifications Physical and Biological Metals(ug/L) <br /> Designation Agriculture DM MWAT acute chronic <br /> Reviewable Aq Life Cold 2 Temperature°C CS-II CS-II Arsenic 340 — <br /> Recreation E acute chronic Arsenic(T) — 100 <br /> Qualifiers: D.O.(mg/L) — 6.0 Cadmium TVS TVS <br /> Other: pH 6.5-9.0 — Chromium Ill TVS TVS <br /> chlorophyll a(mg/m2) — 150' Chromium 111(T) — 100 <br /> `chlorophyll a(mg+nr')(chronic)=applies only <br /> above the facilities listed at 32 5(4). E.coil(per 100 mL) — '126 Chromium VI TVS T/S <br /> "Phosphorus(chronic)=applies only above the Inorganic(mg/L) Copper TVS TVS <br /> facilities listed at 32.5(4). <br /> "Uranium(acute)=See 32.5(3)for details. acute chronic Iron(T) — 1000 <br /> *Uranium(chronic)=See 32.5(3)for details. Ammonia TVS TVS Lead TVS TVS <br /> Boron — 0.75 Manganese TVS NS <br /> Chloride — — Mercury(T) — 0.01 <br /> Chlorine 0.019 0.011 h1otybdenum(T) — 150 <br /> Cyanide 0.005 — Nickel TVS TVS <br /> Nitrate 100 — Selenium TVS TVS <br /> Nitrite — 0.05 Silver TVS TVS <br /> Phosphorus — 0.11• Uranium varies` varies' <br /> Sulfate — — Zinc TVS 'TVS <br /> Sulfide — 0.002 <br /> III <br /> Table 3.6 Grassy Valley Surface Water Standards (COARUA24) <br /> 24.Mainstem of East and West Beaver Creeks,including all tributaries and wetlands,from the source to the confluence with Beaver Creek;mainstem of Beaver Creek from the <br /> source to the point of diversion to Brush Hollow Reservoir. <br /> COARUA24 Classifications Physical and Biological Metals(ug/L) <br /> Designation Agriculture DM MWAT acute chronic <br /> Reviewable Aq Life Cold I Temperature°C CS-ll CS-II Arsenic 340 — <br /> Recreation E acute chronic Arsenic(T) — 0.02 <br /> Water Supply D.O.(mg/L) — 6.0 Cadmium TVS TVS <br /> Qualifiers: D.O.(spawning) — 7.0 Cadmium(T) 5.0 — <br /> Other: pH 6.5-9.0 — Chromium111 — TVS <br /> Temporary Modification(s)' chlorophyll a(mgtm2) --- 150 Chromium 111(T) 50 -- <br /> Arsenic(chronic)=hybrid E.coli(per 100 mL) -- 126 Chromium VI TVS TVS <br /> Expiration Date of 12/31.2024 Copper TVS TVS <br /> 'Uranium(acute)=See 325(3)for details. Inorganic(mglL) Iron — WS <br /> 'Uranium(chronic)=See 32.5(3)for details. acute chronic Iron(T) — 100C <br /> Ammonia TVS TVS Lead TVS TVS <br /> Boron -- 0.75 Lead(T) 50 — <br /> Chloride — 250 Manganese TVS TVS/WS <br /> Chlorine 0.019 0.011 Mercury(T) — 0.01 <br /> Cyanide 0.005 — Molybdenum(f) — 150 <br /> Nitrate 10 — Nickel TVS TVS <br /> Nitrite — 0.05 Nickel(T) — 100 <br /> Phosphorus — 0.11 Selenium TVS TVS <br /> Sulfate — WS Silver TVS TVS(tr) <br /> Sulfide — 0.002 Uranium varies' varies* <br /> III Zinc TVS TVS <br /> SSR Mining Inc. PAGE 4/4 <br />