2007-11-22_REVISION - M1997054 - Laserfiche WebLink

Home Browse Search

be below the invert channel of the Arkansas River ? If it is, how does the operator plan to mitigate impacts to the river, please explain. 4) Is the operator planning to obtain two NPDES discharge permits one for the quarry and another for the sand and gravel operation ? What is the pumping configuration for that will be utilized. Please explain. 5) The Division has received comments from the State Engineers Office. The SEO has confirmed that Front range Aggregates has a well permit for evaporative loss during operation. Is the operator planning to construct a separate well water storage area for use on site or is the water going to be pumped from the well ? Please also place the location of the well on either the Mining plan or reclamation plan maps. 6) The Division has finally received on 11/7/07 the Tallahassee Creek flood plan study supplied to FEMA. Has the study and its conclusions been accepted by FEMA ? In the study, the operator's report concludes that much of the inundated area shown on the current Flood Insurance Rate Map (FIRM) to be in fact outside of the 100- year Flood Plain for the site. Did FEMA agree with your conclusions ? Please provide their approval letter. The Division recommends the operator to place all solvents, fuels etc., outside of the 100year fold plain area. 7) As requested earlier, please provide the details for the pit dewatering. The operator must include all structures that will be utilized to pump the water from the pits to the natural drainage. The operator must include pit inflow calculations to show that the proposed method will be able to handle the rate of pumping to keep the pits dry, so it can be mined. Since wet mining is not being proposed, the operator has to also commit that no kind of wet mining will be taking place. 8) Based on the proposed mining plan for the granite quarry the three drainages to the Tallahassee creek will be impacted. Has the operator obtained a permit from the Army Corps to allow them to impact these drainages ? Three settling ponds are planned in association with these drainages. Please provide details of these ponds. Are any of these ponds going to remain in place after mining or going to be part of the reservoir ? Please explain. 9) The operator states " Later Phase of the quarry development will result in closed basin that captures all drainages from the tree basins. Due to the steep slopes above the mine, it will be difficult to reroute these drainages around the mining limits with out excessive disturbances of the hill side. It is proposed that any storm water entering the mine site be pumped and returned to the river for the life of the mining operation'. What is the expected Pak flow from these drainages to the pit? What kind of pumping system is the operator proposing given the depth final depth of the quarry? The details of the design has to include the of pumps that will be required to pump the water from the pit and the way it is going to be conveyed to the river. The Division assumes the operator's reference to the river to be the Tallahassee Creek. Please explain. VI) EXHIBIT L RECLAM ATION COST ESTIMATE. Once the Division receives the requested information above the cost estimation will be calculated and provided to the operator for their review. 6