PERMFILE117071 - Laserfiche WebLink

Home Browse Search

1. The existing diking on the property along the South Platte River will be retained. This will maintain the present flow profiles during any significant flooding. 2. Stockpiles associated with the mining and processing will be aligned as much as possible with flood flow directions in major events. 3. No mining will take place within 100 feet of the South Platte River to preserve a buffer between the pit and the river. 4. Floodwaters entering the property will merely flow into the pits on the property, overflow the pits and spread out at a low velocity and flow down the floodplain. GROUNDWATER The Perry Pit will be operated using wet mining methods which will allow groundwater to flow through the pits during mining creating a minimal impact to groundwater levels. Any drawdowns associated with the mining of the Perry Pit will be small and very limited in areal influence. Accompanying this exhibit is a list and map of wells near the Perry Pit property. Hany of these wells are shallow alluvial wells with a junior appropriation. None of these wells are expected to be impacted by the operation due to the wet mining methods which will only produce a small drawdown in a very limited area. The only item that may be impacted by the mining is the seep ditch branch of the Lupton Bottoms Ditch. As proposed earlier, a monitoring well will be constructed to observe any changes in groundwater flow levels to the seep ditch. The integrity of water flow in the channel of the South Platte River will be maintained with the 100 foot minimum setback from the Aver proposed by the mining plan. WATER USAGE Water consumption from the mining operation will come from the following componentse Hoisture loss in material The proposed operation ie expected to process approximately 300,000 tons of sand and gravel per year. The average moisture content of this material at the Lime of shipping is approximately 43. This would be equivalent to 8.8 acre-feet per year. G-2