Laserfiche WebLink
II. Support Facilities - Rule 4.04 <br />Information on mine support facilities is found in Volume 2, Tab 12 of the <br />permit application. A summary is found in the Summary Section of this <br />document under "Description of Operations and Reclamation Plan." Specific <br />findings for Rule 4.04 are not applicable. <br />III. Hydrologic Balance - Rule 4.05 <br />Volume 3, Tab 14 of the HGT permit application includes an assessment of the <br />probable hydrologic consequences of the proposed mining operation. Each year, HGT <br />assesses the ongoing impacts to the hydrologic system in its annual hydrologic report. <br />The probable hydrologic consequences as set forth in Volume 1, Tab 14 are <br />summarized below. The small area exemption sites are listed in Volume 12, Tab 12 of <br />the permit application. <br />A. Water Quality Standards and Effluent Limitations <br />Receiving stream standards for the Yampa River and its tributaries have been set by <br />the Colorado Department of Health in their publication, "Classification and Numeric <br />Standards for Upper Colorado River Basin and North Platte River (Planning <br />Region) ". Dry Creek is within segment 12 of the Upper Colorado River sub -basin <br />and basin. Colorado Department of Health NPDES (National Pollution and <br />Discharge and Elimination System) limitations on discharge and the Division's <br />standards for determining material damage to the hydrologic balance ( "Division <br />Procedures for the Assessment of Material Damage with Respect to Alluvial Valley <br />Floors, the Cumulative Hydrologic Impact'Assessment and Subsidence at Coal <br />Mines ") are based in part on these standards. <br />1. Most disturbed area drainage passes through one of two existing sediment ponds <br />(some disturbed area drainage passes through SAE's, described in # 2 below). <br />Discharges from these ponds are monitored to verify compliance with water <br />quality standards and effluent limitations (4.05.2(2)). <br />2. The Division has approved ten small areas (SAE's) to be exempted from the use <br />of sediment ponds due to the limited size of areas and due to the fact that ponds <br />and treatment facilities are not necessary for the drainage to meet the effluent <br />limitations of Rule 4.05.2 and applicable State and Federal water quality <br />standards for receiving streams. These areas have also been exempted because no <br />mixing of surface drainage with a discharge from underground workings will <br />occur. Three small area exemptions are permitted for the three topsoil stockpiles <br />(TS -1, portion of TS -2, TS -3) and six topsoil stockpiles (A, C, D, E, F, and G) <br />and one temporary waste stockpile (TWS) associated with the TAHR outside the <br />sediment control system. Documentation of these exemptions is found in Volume <br />12, Tab 12 of the permit application (4.05.2(3)(b)(i)). <br />Hayden Gulch Loadout 20 November 22, 2011 <br />