PERMFILE42981 - Laserfiche WebLink

Home Browse Search

Concurrent mining ~ reclamation of the site ~1 reduce the area exposed to the impacts of stormwater. Revegetation will occur on a timely basis to further reduce the potential impacts of stormwater runoff. A maintenance shop with three bays and a concrete floor will be constructed in the northwest corner of the processing area. ~.0 Potential Pollutant Sources/Material Inventory Potential pollutants which could eventually be stored on site include gasoline, diesel fuel, waste oil from equipment maintenance, burner fuel for the asphalt plant, emulsified asphalt, ac cement, and waste asphalt waiting to be recycled. This list could include other potential pollutants, and they will be added to the SWMP report when they are brought on site. All fuel tanks and other containers, holding liquids stored outside, will be surrounded be earthen berms of sufficient size to contain all the contents of a full container should a leak occur. Overhaul and daily equipment maintenance will be performed inside the maintenance shop. waste oil from equipment maintenance will be stored only long enough to make the pick-up and disposal cost- effective. All outdoor equipment parking areas will be monitored for signs of spills and leaks. Good housekeeping practices will be used with equipment and materials at the site to prevent safety hazards and accidents, and to avoid unnecessary environmental impacts. 4.0 Best Management Practices (BMPs) for stormwater Pollution Prevention 4.1 stormwater Discharge and Retention The original ground surface drains to the southeast. The ground surface during and following mining of the site will drain more toward the south, into the lakes created by the mining. These lakes will act as settling basins for all stormwater runoff from the site. Water in these ponds will be filtered as it infiltrates into the groundwater. No information is available to relate the volume of available storage to runoff frequencies. There will not be spillways at these ponds. In areas where mining is not occurring, existing vegetation will be left on the ground to slow stormwater runoff and prevent erosion. No stormwater prevention structures will be constructed in areas not currently disturbed by mining activities. Irrigation ditches currently do, and will continue to, cross the site. Some stormwater runoff is caught in these ditches and flows toward the eastern side of the site. These ditches may discharge into the lake system (mining pits) or will carry the waters to their historic discharge point at the Arkansas River. stormwater flows in the processing area will be routed to the southern side via swales, and collected in siltation ponds. These ponds will contain most storm events, and would discharge to existing irrigation ditches should their capacity be exceeded. -2-