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3 <br />2.05.60Protection of the Hydrologic Balance <br />This is a review of the permit requirements for Rule 2.05.6(3)(a)(i), (iii), and (iv) and includes an assessment <br />of the probable hydrologic consequences related to the mining operation. <br />The Findings documents related to Permit Renewals 06 and 05 dated December 2014 and May 2009 <br />respectively, discuss projected and observed hydrologic impacts to both surface and ground water. <br />This section of the rules is adequately addressed in the permit. <br />Rule 2.06 Special Categories of Mining <br />Rule 2.06.8 Surface Coal Mining and Reclamation with Respect to Alluvial Valley Floors <br />The two (2) river systems which contain alluvial valley floor deposits and pass through the permit area are: <br />a) Yampa River and <br />b) Williams Fork River. <br />The locations of the two (2) rivers relative to the mine permit boundary are shown on the Structures and <br />Renewable Resources Map (Map 25) and the Regional Geology and Hydrologic Monitoring Program Location <br />Map (Map 11). <br />Permit section 2.06, Requirements for Permits for Special Categories of Mining (Permit Revision 04-34), <br />discusses mining activities and impacts as they relate to these two alluvial valley floors (AVF's) and describes the <br />characteristics of these AVF's. <br />The permit adequately addresses the requirements of rule 2.06.8. <br />Rule 4.040b) and (274) Support Facilities <br />Rules 4.04(lb) and (2-4) were reviewed for support facilities related to water and air quality degradation and for <br />controlling erosion, siltation and fugitive dust. <br />Support facilities are discussed in permit section 4.04 and depicted on the Structures and Renewable Resources <br />Map, (Map 25). Section 2.05.6 of the permit, Mitigation of the Impacts ofMininQ and Exhibit 18 detail the <br />specific measures to limit runoff from the facility areas and collect and retain runoff that occurs. <br />The air pollution emissions permit addresses construction and dust emissions. Exhibit 2, Other Required <br />Permits, of the permit application provides copies of these permits from the Colorado Air Pollution Control <br />Division <br />The permit adequately addresses the requirements of Rule 4.04. <br />4.05 Hvdrologic Balance <br />There are two rivers in the vicinity of the mine site. The Yampa River, flows in a southeasterly direction across <br />the mine site. The Yampa River drains most of the northeast corner of Colorado and part of south - central <br />Wyoming. The second river is the Williams Fork, a major tributary of the Yampa River. The Williams Fork River <br />joins the Yampa River on the mine property. Monitoring data is collected for the Williams Fork River. <br />There is one active spring on the mine site area, known as the No. 1 Strip Pit Discharge, or 1 SP. There are other <br />springs and local permanent "damp spots" in the area; however, their combined flow is normally less than 10 <br />gallons per minute (gpm) and are therefore not significant. The 1 SP Discharge is a CDPS monitoring point <br />(Outfall 022). <br />Williams Fork Mid Term Review Prepared by: R. Reilley <br />Date: February 2016 Document Location: M\\Coal\rar\MidTerm Reviews <br />