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_}g_ With the acceptance of the above stipulations, the applicant will have adequately addressed requirements of Rules 2.04.5, 2.04.7, 2.05.3(4), 2.05.6(3), and 4.05 and the proposed operation will oe in compliance with the requirements of this section. VII. Probable Hydrologic Consequences of Mining and Cumulati The following discussion of probable hydrologic consequences of mining covers all mining anticipated under the dry mine plan, for which this permit approval directly applies. The cumulative hydrologic impacts assessment however, includes not only the dry mine plan but also includes plans for mining in old flooded underground workings and saturated coal seams. Mining in these areas containing water is not apart of this permit approval because of the severe data gaps and lack of sufficient plans addressing the pumping, treatment, and disposal of water contained in the workings and coal seams. However, the applicant has indicated to the Division that necessary data and plans will be gathered and formulated and application will be made for mining in the flooded areas again in the near future. It therefore seems prudent at this time to include projected impacts of dewatering and mining of flooded workings and coal seams in the Cumulative Hydrologic Impacts Assessment. Probable Hydrologic Consequences Ground Water There are four potential aquifers in and adjacent to the Colorado Coal Pline No. 1 dry mine plan area. These are the Trinidad sandstone, the perched interbedded and lenticular sandstones of the Vermejo and Raton Formations, the alluvium of the Maitland and Gordon Arroyos, and the coal seams. Under the dry mine plan the alluvium of the Maitland and Gordon Arroyos will not be disturbed by mining activities. A 500 foot wide buffer zone has been established on both sides of the Maitland Arroyo. No mining disturbance is planned within 5UU feet of the Gordon Attoyo. No adverse impacts on the Trinidad sandstone are anticipated under the dry mine plan. This is due largely to the restrictions contained in the dry mine plan. The Trinidad sandstone and most of the lowest coal seam are included within the ground water zone. Since no mining is to occur in this zone, no impacts should be experienced by the Trinidad sandstone. The perched interbedded and lenticular sandstones of the Vertnejo and Raton Formations, and the coal seams will be impacted by mining. These strata will be broken up, removed, then to some degree returned as backfill material. The toxic roof and floor strata and coal processiny waste associated with the Lennox and Cameron coals will be diluted in the backfill. This should serve to improve the quality of water that percolates through the fill. The backfilled area should also exhibit greater permeability following reclamation.