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PROJECTED HYDROLOGY IMPACTS 1988 Much data has been generated over the last Eive (plus) years. Utilizing this data and based on future mine plans, CWI projects potential impacts of mining to the hydrologic regime. CWI anticipates the submittal of a technical revision during the summer of 1988, to reduce the number of resources which are presently being monitored. The following discussions _are divided into three sections. These are: Surface Water - Projected Impacts, Groundwater - Projected Impacts, and Orchard Valley Mine Site - Projected Impacts. Surface water discussions include streams and ponds. Groundwater discussions include colluvial/alluvial and bedrock resources. SURFACE WATER - PROJECTED IMPACTS Streams: Impacts to streamflow during 1988 are projected to be minimal. As only damp conditions and no inflows were experienced as both East Roatcap Creek and Steven's Gulch were undermined during 1987, no inflows or impacts to these streams are projected during 1988. No other streams would be undermined during the year. No development in the sealed Orchard Valley Mine would occur and no impacts to resources over the mine are projected. Ponds: No ponds are projected to be undermined during 1988. Mining may reach the area east of pond Nos. 14-2 and 88. Overburden in this area is near 1,000 feet and no impacts to these ponds are projected. No change to the ponds which overlie the Orchard Valley Mine are projected. GROUNDWATER - PROJECTED IMPACTS Near Surface colluvial-Alluvial Groundwater: With the projected development of Panel G northward from the II West Submains, no springs would be undermined. The colluvial-alluvial area of SM-7 and the above mentioned ponds may be just west of this development. Overburden is near 1,000 feet and no impacts to this area are projected. Monitoring of shallow monitoring wells and springs in the area would continue and would verify this projection. As no activity would occur in the Orchard Valley Mine, no impacts to resources in the area of this past development are anticipated. Bedrock Groundwater: No impacts to bedrock groundwater are evident from past monitoring and mining data and no impacts are projected. Monitoring of drill holes GR77-7 and DH-60, which are in the areas of the existing and projected OVWM development, would continue. Again, no impacts are projected in the area of the dormant • Orchard Valley Mine.