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<br />n <br />LJ <br />I~1 <br />~J <br />L0 Hydrologic .Nortimring .4aiviries <br />priority from July to September. In 1994, <br />Mountain Coal's water rights were out of <br />and 1994, MCC's Mt. Gunnison Pipeline <br />water 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 acft/year. MCC has a conditional <br />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 not 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Or, it can be withdrawn for dust suppression 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 <br />Water <br />The sanitary waste water treatment plant has <br />been operating since the fall of 1982. Dur- <br />ing WY 1994, discharse from the plant <br />averaged 5.2 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 J. <br />1.5.3 Groundwater Inflows <br />Groundwater appears to be contained within <br />fractures, roof joints, minor faults, or rock <br />spars. Except for areas near the under- <br />ground mine portals, dripping and water <br />inflow generally subsided within 24 hours <br />(Figure 3). Areas of damp top persisted <br />locally along the more pronounced fracture <br />trends. Water inflows were greatest along <br />the more highly fractured zones. Initial <br />estimated water inflows have typically been <br />as high as 20 gallons per minute (gpm). <br />After fractures were dewatered, inflows <br />dropped substantially. In one area of the <br />north longwall bleeder entries under Lone <br />Pine Gulch, inflows of 35-50 gpm were <br />measured during a three week period. No <br />locations produced sustained flows of water. <br />Some groundwater inflows in areas near the <br />portals of the mine continue to reflect <br />climatic precipitation cycles (heavy rains or <br />snow melt). Total inflow was estimated by <br />adding up all the imported volumes and <br />deducting from exponed volumes, resulting <br />in a total contributed by natural inflow. <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 />1.5.5 Mining Activity <br />"B" Seam <br />All minting activity was accomplished in the <br />"B" Seam during WY 1994. During water <br />year 1994 (WY 94) the continuous miner <br />sections completed developing the 4th <br />Notthwest Headgate Section, 5th Northwest <br />R LIIU,10.\ US OS ~i~9.U~aml <br />13 REMISED IOi09r96 <br />