Minimize the disturbances to the prevailing hydrologic balance at the mine site and in associated off-site areas and to the quality and quantity of water in surface and groundwater systems both during and after surface mining operations and during reclamation by: 1. Preventing or removing water from contact with toxic-material producing deposits;
2. Treating drainage to reduce toxic material content; and
3. Casing, sealing or otherwise managing boreholes, shafts and wells to keep acid or other toxic material drainage from entering ground and surface waters;
- Avoiding acid or other toxic mine drainage by using measures such as, but not limited to:
- Conducting operations to prevent unreasonable additional levels of suspended solids to streamflow or runoff outside the permit area above natural levels under seasonal flow conditions;
- Removing temporary or large siltation structures from drainways, consistent with good water conservation practices, after disturbed areas are revegetated and stabilized;
- Performing any other actions as the commission may prescribe under rules and regulations adopted under this chapter;