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COLORADO DEPARTMENT OF HEALTH, Rationale - Page 3 Permit No Water Quality Control Division CO-0043168 1. Stream Low Flow: (Cont.) three years (lE3}, or chronic, those that occur for thirty days every three years (30E3). These flows have been determined for Gregory Culch above the discharge point by the Water Quality Control Division and are as follows: Twe Flow Acute (lE3) 0.02 cfs (0.013.MGD) Chronic (30E3) 0.02 cfs (0.013 MGD) 2. Impacts on Downstream Water Supplies There are no known surface water supply intakes located within five miles downstream on Cregory Gulch or North Clear Creek from this facility. With compliance of permit limitations, the Golden Mile Joint Venture facilty discharge should not impact downstream classified water uses in segment 13. IV. FACILITY DESCRIPTION A. Industry Description: This facility is an existing mine (the Bates Hunter Mine) which is presently being evaluated for erploratory purposes. The underground mine has been inactive for some 50 years and is full of groundwater, which will require a dewatering discharge of this mini water. According to the permit application, the exploration phase will be occurring for approximately one year with possible conversion to an active mining operation then depending upon the exploratory results. There is potential for gold mining; the principal product is gold ore, at a projected production rate of 200 tons per day. Some silver ore will also be mined. The operation will be occurring continually on a year round basis. The mined ore will be shipped off the property for gold and other metals recovery at the Bates Hunter Mill which is approximately one mile northeast of the mine; the location of this mill is shown on the map in figure 1 of the permit. A site diagram of the Bates Hunter Mine facility is shown in figure 3 of the permit. This mine is located in the vicinity of a superfund cleanup area, which includes the Quartz Hill Tunnel, the Gregory Incline, and the National Tunnel; these superfund sites are also shown in figure 2 of the permit. A fuel storage area is shown in figure 3 of the permit. No land application of the wastewater will be used on site. B. Wastewater Treatment Facility Description: The proposed wastewater treatment facility will probably include a clarifier with chemical precipitation of metals with the addition of either lime or soda ash; or instead, possibly a greensand zeolite filter will be used with the addition of potassium permanganate.