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^ Reduction of ground water discharge to streams ^ Reduction of overburden spring flow ^ Ion changes in the ground water system After mine closure, flooding of the existing workings will occur. Until the pre-mine static water level in the aquifer is re-established, discharge via the natural discharge point will be subdued. The Purgatoire River is the likely discharge recipient, probably near the center of the Raton Basin. The same situation would hold true for any springs in the overburden which exist where drainages have intercepted the piezometric surface of the overburden aquifer. Until the overburden aquifer resaturates to approximate pre-mine levels, flows from the springs in the overburden will be reduced or cease entirely. Subsidence fracturing and rubblization in the overburden could also cause decreases in spring flows in the overburden. Subsidence after mine closure could occur in areas over entries where subsidence was not projected during active mining. It is likely that isolated subsidence would have minimal to negligible effects on springs. Upon flooding of the workings, the water quality in the coal seam and overburden will be similar to water quality observed during mining. Some degradation of this water will occur due to contact with rubblized gob and other mine areas. IV. Topsoil No specific approvals are granted under this section. V. Sealing of Drilled Holes and Underground Openings A. The Division will require that each hole, well or other underground opening be capped, sealed, backfilled, or othenrvise properly managed (4.07.3). VI. Use of Explosives No specific approvals are granted under this section. VII. Disposal of Excess Spoil No specific approvals are granted under this section. VIII. Coal Mine Waste Banks A. The Division is proposing to approve plans for use, construction and