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-19- The Ioadout is roughly 2 miles from the Colorado River. All runoff, which only results from direct precipitation over the 5.6 acre disturbance, will be con- tained at the site, and no runoff will be discharged from the site. Due to the limited surface disturbance, the potential impact of the loadout on the Colorado River alluvial valley floor is insignificant. Alluvial Valley Floor Findings With Regard to Farming The only aspect of the operation which will physically impact the area of an existing alluvial valley floor is the haul road across East Salt Creek. This road was a ranch road prior to the development of the mine. The road has been widened to improve access to the mining operation. No further disturbances to the valley floor are planned with regard to this road. The total area of alluvial valley floor which has been affected by the road is 1.6 acres. The total area of alluvial valley floor within a '~ mile radius of the confluence of Munger Canyon and East Salt Creek is 240 acres. The disturbance affects approximately .70 of the alluvial valley floor within a '~ mile radius of the confluence. Since this area is a small percentage of the total AVF and since this area was previously disturbed, the effects on the AVF of East Salt Creek are negligible. There is an area of irrigated agriculture in the East Salt Creek valley. This area is located di rectZy upstream of the haul road to the Munger Canyon Mine (as is indicated in Figure 4.1-2of the permit application). The Munger Canyon operation will not affect the quantity or quality of water tributary to this area and, thus, will not effect the productivity of this AVF. With respect to Stove and Buniger Canyons, the unnamed tributary to East Salt Creek and Big Salt Wash, there is no potential for the interruption, discontin- uance, or preclusion of mining on an alluvial valley floor. No underground development will pass beneath an alluvial valley floor, nor will any surface disturbance occur in any of these areas. Therefore, pursuant to Rule 2.06.8(5)(1), the Division finds that the proposed surface coal mining operations will not interrupt, discontinue, or preclude farming on an alluvial valley floor. Alluvial Valley Floor Findings With Regard to Material Damage to Water Quality and Quantity As mentioned previously, the Munger Mine will be developed into portions of four drainage basins. The surface disturbance will occur only within Munger Canyon and a small portion of East Salt Creek. Obviously, the greatest potential for diminution of water quality and quantity would be attributable to the area of greatest surface disturbance. The surface disturbance in Munger Canyon will be comprised of the mine bench, the waste disposal pile and haul roads leading to the portal area. These distur- bances will affect approximately 35 acres.