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• Altematlve Water Supplies <br />Attachment 16-1 of Tab 16 (Water Rights Issues and Plan for Augmentation Nucla Mine, Montrose <br />County, Colorado) lists the water rights and sources WFC has available to utilize as alternate water <br />supplies to mitigate sediment pond storage, and industrial water use impacts to surface water right <br />holders. The principal altemative water supplies are the 114.5 acre foot consumptive use credit of <br />Colorado Cooperative Company (CCC) water, 18 acre feet of pit inflow water during the non- <br />irrigation season and the absolute storage right in 001 pond of 4 acre feet. No mitigation of any <br />ground water impacts are anticipated. All of the above water sources are considered as altemative <br />water supplies that can be used as part of Peabody's augmentation plan for mitigating potential <br />surface water rights impacts. It is estimated that Peabody, following augmentation usage, will still <br />have available approximately 54 acre-feet of excess consumptive use credit of (CCC) water. The <br />altemative water sources will be selected based on the pre-impact quantity and quality of the source <br />to be mitigated. <br />Introduction. In addition to the mining practices designed to minimize disturbances to the hydrologic <br />balance previously discussed, comprehensive ground and surface water monitoring plans have been <br />developed to assess the possible impacts to the hydrologic system identified in Tab 17, Probable <br />• Hydrologic Consequences (PHC). The results of the monitoring programs have and will continue <br />to be employed to support the PHC conclusions that disturbances to the hydrologic balance will be <br />minimal and that the potential uses of the ground and surface water systems affected by mining will <br />not be changed. Additional ground and surface water monitors are proposed specifically to help <br />insure that water rights are protected. Pending landowner and permit approvals, these sites will be <br />incorporated into the monitoring program. <br />The parameters analyzed for at each monitoring site as well as sampling and monitoring frequencies <br />are documented in Tab 15, Hydrologic Monitoring Program. Table 18-1 shows which monitoring <br />sites are utilized to address each of the probable hydrologic consequences discussed in Tab 17. <br />The location of each of the monitoring sites can be seen on Exhibit 7-1 (Tab 7, Hydrologic <br />Description). The following monitoring plan discussion will address how the monitoring data or <br />programs will be used to determine impacts to the hydrologic balance. <br />Overburden, Dakota Coal and Alluvial Aquifer Quantity and Quality. Future drawdowns in the <br />overburden, coal and alluvial aquifers will be compared against multiple year predisturbance <br />(baseline) average water level fluctuations at the 4, 2, 19, 9 and 14 proposed and existing spoils, <br />• <br />18-3 <br />