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Climax Molybdenum Company <br /> Permit No.1977-342 Technical Revision (TR-35) <br /> operating safety showers, eye wash station, sinks, and washrooms underthe calculated instantaneous maximum <br /> potable water demand. Henderson currently operates a Public Water System (PWSID#CO-0225116)for the mill. <br /> The package system for the WTP will be a separate system serving less than 25 individuals daily and is therefore <br /> exempt from the design review process under the Colorado Drinking Water Regulations administered by the <br /> WQCD of the CDPHE. <br /> 3.6 Construction Storm Water Permit <br /> The EPA requires that storm water discharges be regulated under the National Pollutant Discharge Elimination <br /> System (NPDES) program. The Colorado program is referred to as the Colorado Discharge Permit System <br /> (CDPS) and is administered by the WQCD of the CDPHE. A Construction Stormwater General Permit <br /> (COR400000) is required for projects disturbing greater than 1 acre. Although the construction of the WTP will <br /> likely disturb more than 1 acre, the primary plant construction area is within the boundaries of the Henderson Mill <br /> process water system, within which stormwater is captured and managed as process water and therefore <br /> regulated under the Site's CDPS discharge permit. This process water system includes drainage areas which <br /> contribute or flow to the TSF and the East Branch Reservoir, including the mill area and the location of the WTP. <br /> Construction activities outside of process water system boundaries are limited to the tie into the existing Williams <br /> Fork Pipeline and minor modifications within the Williams Fork Pumphouse and are not expected to exceed 1 <br /> acre. Because construction of the WTP will not create stormwater outfalls outside of this area a Construction <br /> Stormwater General Permit is not anticipated, although Henderson will consult with the WQCD, as appropriate. <br /> April 2022 <br />