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adversely impacted, alternatives, including the use of righted water supplies, are available that could be used to
<br />address this impact under the approved Augmentation Plan. Potential alternatives to address any water rights
<br />impacts for stock ponds include: 1) Repair or reconstruction of pond embankments, and sealing of the ponds, if
<br />necessary, 2) Construction of a replacement stock pond(s), 3) Installation of guzzlers, or 4) Providing water from
<br />another source.
<br />In the unlikely event that TC's mining activities result in a loss of water from the surface streams such that senior
<br />downstream users place a call on the system, the mine has adequate water rights to mitigate this loss under the
<br />approved Augmentation Plan. If this were to occur during the irrigation season, TC could stop flow through any of
<br />its headgates and allow the water to move downstream. If additional water were required, TC could have water
<br />discharged from any of the large permanent impoundments that surround the mine. Also during this time, TC
<br />would continue to discharge from the mine, which would provide supplemental flows to the system. Please refer to
<br />Table 9, Summary of Ground Water Rights, and Table 12, Summary of Surface Water Rights, for a listing of the
<br />water rights controlled by TC that would be available for augmentation. Due to the uncertainty of the location of the
<br />potential water call, it is not known which headgate(s) would be shut off. It is highly unlikely that this situation would
<br />ever occur, given that there has not been a downstream call on the system to date.
<br />(4) A map prepared according to the standards of 2.10 showing_
<br />(a) The locations of water supply intakes, ditches, reservoirs, and wells within a one mile
<br />minimum radius of the affected area, current users of surface water flowing into, out of, and within a hydrologic area
<br />defined by the Division, and those surface waters which will receive discharges from affected areas in the proposed
<br />permit area and adjacent area:
<br />(b) Elevations and locations of monitoring stations used to gather data for water quality
<br />uanti .
<br />(c) Location and extent of sub - surface water, if encountered within the pro op sed permit or
<br />adjacent areas, including but not limited to areal and vertical distribution of aquifers and estimate of seasonal variations
<br />of aquifer characteristics on cross sections and contour maps as appropriate.
<br />(d) Location of surface water bodies such as streams, lakes, ponds, springs, constructed or natural
<br />drains and irrigation ditches within the proposed permit and adjacent areas;
<br />(e) Location and dimension of existing areas of spoil, waste, and non -coal waste disposal, dams,
<br />embankments, other impoundments, and water treatment and air pollution control facilities within the proposed Permit
<br />area,
<br />(f Location, and depth, if available, of gas and oil wells within the proposed permit area and
<br />water wells in the permit area and adjacent area; an d
<br />(g) Elevation and location of test borings and core samplings.
<br />RESPONSE
<br />Identification of surface and ground water features which existed prior to underground mining, as well as water
<br />monitoring stations used for baseline data collection, are shown on Map 13, Twentymile Park Hydrology, and Map 14,
<br />Five -Year Mine Plan Baseline Hydrology. The facilities to be used for water handling and treatment, as well as
<br />information on impacts of mining on water resources, are shown on Map 16, Water Control and Subsidence Monitoring
<br />Plans, and Map 24, Surface Facilities.
<br />Sub - surface water features, including extent and characteristics of aquifers, identification of monitor wells, and
<br />elevation of water table and piezometric surface of aquifers are shown on Map 13, Twentymile Park Hydrology, and
<br />TR13 -83 2.04 -40 11/03/14
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