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• <br />n <br />LJ <br />• <br />1.0 Hvdrolagic Moniroring dcnvinrt <br />per second (cfs) and no "call" is made <br />downstream), water can be pumped from the <br />intake point to the freshwater storage pond <br />within the surface facilities area. In average <br />years, this water right is expected to be out <br />of priority from July to September. In <br />1995, Mountain Coal's water rights were <br />never out of priority. In WY 1986 and <br />1994, MCC's Mt. Gunnison Pipeline water <br />right met quadrennial diligence for a <br />conditional portion. Accordingly, an addi- <br />tional portion was deemed absolute by the <br />Division 4 Water Court. That decision <br />brought the absolute portion to 1.0 cfs or <br />724.2 acre-feet per year. MCC has a <br />conditional right to an additional 14.0 cfs. <br />Pond FW-1 provides for water storage. <br />Water can also be stored in Sediment Ponds <br />MB-1, MB-2R, and MB-3 under a separate <br />decree. Transfer to FW-1 is possible as <br />outlined in the M & R Plan. Average <br />withdrawals are noc expected to exceed <br />400,000 gallons per day (gpd). Flow may <br />fluctuate depending on requirements associ- <br />ated with varying production levels. <br />Water from the freshwater pond is used in <br />three ways. It can be treated to meet <br />potable and sanitary water requirements, <br />used, and then treated as sanitary waste <br />water. It can be used for miscellaneous <br />surface activities (dust suppression, etc.) <br />Or, it can be withdrawn for dust suppression <br />in the mine, in which case it then becomes <br />mine water. <br />1.5.2 Sanitary Waste Water <br />The sanitary waste water treatment plant has <br />been operating since the fall of 1982. Dur- <br />ing this WY, discharge from the plant <br />averaged 6.42 gpm, when discharging. <br />Discharge monitoring results from the waste <br />water treatment plant, conducted under <br />NPDES Permit No. CO-0038776, are in- <br />cluded in Appendix I. All discharges met <br />effluent limitations. <br />1.5.3 Groundwater Inflows <br />Groundwater appears to be contained within <br />fractures, roof joints, minor faults, or rock <br />spazs. Except for areas neaz the under- <br />groundmine portals, water inflows generally <br />subsided within several days. Areas of <br />damp top persisted locally along the more <br />pronounced fracture trends. Water inflows <br />were greatest along the more highly frac- <br />tured zones. Initial estimated water inflows <br />have typically been as high as 50 gallons per <br />minute (gpm). After fractures were de- <br />watered, inflows dropped substantially, often <br />too damp or dry conditions. Some <br />groundwater inflows in areas near the por- <br />tals of the mine continue to reflect climatic <br />precipitation cycles (heavy rains or snow <br />melt). <br />Exhibit 3 ("B" Seam Advance Map) shows <br />locations of inflows in the "B" seam. No <br />seasonal variation in flows was observed. <br />Cumulative inflows were estimated by <br />observation and quantities pumped from the <br />mine workings. <br />1.5.4 Mining Activity <br />"F" Seam <br />No new mining occurred in the F seam. <br />Inflows in areas still accessible were moni- <br />tored by occasional visits. No new inflows <br />were observed. Existing inflows in the <br />Main Intakes were similar to the last two <br />years. Inflows are indicated on "F Seam <br />Mine Map -Hydrologic Conditions - WY <br />1991" (1991 AHR). <br />"B" Seam <br />All mining activity was accomplished in the <br />"B" Seam during the WY. By continuous <br />AHR-95.210105/ I5/96l I ~JSpm) <br />11 REVISED 10/08/96 <br />