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_22_ None of these changes, including salt loading, would be significant enough to affect surface water usage. Surface water quality would still be well below recommended stock water standards for total dissolved solids (7000 mg/1). Affected surface waters, like the baseline waters, would classify as medium salinity, low alkali hazard irrigation waters. Surface water chemistry should return to baseline conditions after pH dewatering has ceased, the pits have been backfilled,~graded, and topsoiled, and sediment ponds are removed. As can be seen from the analysis presented here, the combined hydrologic impacts of the three North Park mines to surface water will be negligible, under a worst case scenario. Effect on Ground Water Both the Wyoming Fuel and Kerr mines are located on the flanks of the McCallum Anticline and the Johnny Moore Syncline, and thus, are hydrogeologically adjacent. The Bourg Strip Mine is hydrogeologically separated from the Johnny Moore Syncline by the Ballinger Anticline. Ground water flow through the rock strata from the Kerr and Wyoming Fuel mines will be to the southeast down the plunge of the McCallum anticlinal axis. Ground water flow through the rock strata from the Bourg Mine will be to the northwest down the plunge of the Bourg synclinal axis. Upper terrace alluvial deposits have been eroded away in the Bourg life-of-mine area and thus, the operation will not cumulatively impact the quantity and quality of ground water in this aquifer. The Kerr Coal mine and the Wyoming Fuel mine will affect the quality and quantity of water within the Sudduth coal, underburden and overburden. The quantity of water will be affected by mining out the outcrop-recharge areas of these strata and by the decreased infiltration rates of the reclaimed surfaces compared with the natural surfaces. The quality of ground water will be degraded by the exposure of ground water to fractured and fragmented spoil material. The decreased quantity of ground water and the degradation of ground water will not affect the beneficial use of ground water on- and off-site, since no wells are completed in affected strata. Surface runoff will be slightly increased due to the lower infiltration rates over reclaimed surfaces. There is only one spring issuing from the strata affected by mining (i.e., the Sudduth seam), and this is Located at the northernmost extent of the Kerr mine. The flow from this seep is insignificant in relation to the surface water flow in Sudduth Draw. The spoil aquifer which forms in the reclaimed mine pits will have recharge and discharge characteristics similar to those of the undisturbed strata. Since no significant springs are issuing from the strata to be mined through, and since the elevation of the pit bottoms