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COLGRADO DEPARTt1ENT OF HEALTH <br />'dater Quality Control Division <br />- Rationale - Page 3 <br />• Permit Na.: CO-0038770 <br />I. FACILITY DESCRIPTION: <br />Flows from 001, 002, U03, OUa, OUS, UUo <br />and U08 are not continuous and will <br />likely occur only in response to <br />rainfall or snowmelt events. Discharge <br />point 007, the wastewater treatment <br />plant is expected to have a continuous <br />f 1 aw. ' <br />The facility is a coal underground <br />s#sip mining operation Iocatea along the <br />North Fork of the Gunnison River near <br />Somerset, Colorado. At full production <br />the mine is expected to yield 2.8 <br />million tons of coal per year. N <br />loadout facility is locates on site. <br />Eight discharge points are proposes from <br />the mine. Tao le 1 shows the source df <br />the discharge, treatment, flow and <br />receiving stream for each discharge <br />point. Locations of the discharge <br />points is shown in figure 2, page 21. <br />The domesti; wastewater treatment <br />facility is located in the Southeast <br />• Quarter of Section 9, Township is south, <br />Range 90 west, as is shown in figure [, <br />page 27 of the permit. The area served <br />by this wastewater treatment plant is <br />shown in figure 3, page 28. Sewer lines <br />in the service area primarily include <br />six inch PVC lines and an influent six <br />inch PVC pipe. Tt,e sewers go to the <br />wastewater treatment plant by gravity <br />f 1 ow. <br />The domestic wastewater treatment plant, <br />as shown in Figure 4, page c9 of the <br />permit, includes a oar screen following <br />the influent line. After the oar screen <br />is an ECI Wastech activated sludge <br />package plant. Wastewater flows in the <br />package plant first flow to a flaw <br />equalization basin, then to the <br />activated sludge basin which is operated <br />in an extended aeration mode, to a <br />clarifier, then to the chlorine contact <br />basin followed by a polishing <br />pond. ng_p.oda•. <br />Discharge Point UU7 is from the effluent <br />line from the chlorine contact basin yet <br />• prior to mixing with the north Fark of <br />the Gunnison River. Sludge from the <br />clarifier goes to the aerated sludye <br />holding tank. <br />