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of Rules 2.05.6(6) and 4.20. No subsidence monitoring is required for this operation. <br />XII. Operations on Alluvial Valley Floors <br />The findings in this section regarding the impact of the operation on alluvial valley floors are <br />extremely conservative, as they are based on plans for an active mining operation and <br />significant expansion of current surface disturbance and affected area. As of December <br />2007, the mine has been largely reclaimed and no further coal extraction is proposed or <br />approved. Existing affected area (surface disturbance and underground workings combined) <br />at the mine site is and will remain less than 40 acres; disturbed area is and will remain less <br />than 20 acres. Disturbance in the loadout area is approximately 2.9 acres. <br />Expansion of mine bench facilities, continued coal extraction, and construction of an <br />operational haul road to the mine bench area were originally approved and included in the <br />following analysis and findings. In addition, coal handling and processing facilities that had <br />at one time been proposed for development on the East Salt Creek alluvial valley floor were <br />also considered in the following analysis and findings. Under the currently approved permit <br />to be renewed by RN -05, these activities, facilities, and expanded disturbance areas are no <br />longer proposed or approved. <br />Information provided by the applicant with respect to alluvial valley floors can be found in <br />Section 4.1.4 of the permit application text, and Preliminary Alluvial Valley Floor Mapping <br />is presented on Figure 4.1 -2 of the permit application. Based on a review of this information, <br />the following determinations have been made by the Division: <br />AVF Determination <br />The proposed permit area for the Munger Canyon Mine occupies parts of four drainage <br />basins distinguishable on a topographic map. These basins include Munger Canyon, Stove <br />Canyon, Buniger Canyon and an unnamed tributary to East Salt Creek. East Salt Creek has <br />been determined to be an alluvial valley floor. The irrigated agriculture which exists in the <br />East Salt Creek Valley is evidence of this conclusion. Irrigated cropland as well as areas <br />used for grazing are shown on Figure 4.1 -2 of the permit application. <br />Just south of Munger Canyon, Stove Canyon and Buniger Canyon are sub - basins within the <br />Big Salt Wash drainage system. Munger Canyon and the unnamed tributary are both <br />sub - basins of the East Salt Creek drainage. Development of mine workings during the initial <br />permit term will extend under portions of all of the above - mentioned drainage basins. <br />The central facilities area permit revision increased the permitted area by 273.3 acres. This <br />area will be located along East Salt Creek beginning at the mouth of Munger Canyon and <br />extending southward approximately 1.5 miles to the proposed coal processing waste disposal <br />area. <br />34 <br />