2001-12-11_PERMIT FILE - C1981019 (5)

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. Revised December 7, 1992 Modification of Both Surface Water Monitoring and Alluvial Groundwater Monitoring Locations Background Colowyo currently monitors surface water quality parameters and flow at three separate locations - one site on Taylor Creek and two sites on Goodspring Creek. The Goodspring Creek sites are located so that one location is downstream from mining activities with the other site located upstream of mining activities. Alluvial groundwater quality parameters and water levels are monitored at three separate locations - one site at the Gossard Loadout and two sites on Goodspring Creek. Once again, the Goodspring Creek sites are located so that one location is down gradient from mining activities with the other site located up gradient of the mining activities. Proposed Modifications . With the anticipated expansion of mining activities to the south of the current mining location, it has become necessary to re-establish both the Goodspring Creek upstream surface water monitoring site and the alluvial groundwater monitoring site. For the surface water monitoring site, Colowyo intends to establish a monitoring site (called New Upper Goodspring) located below the confluence of the West Fork of Goodspring Creek and the main Goodspring Creek. This location is sufficiently above any anticipated mining activities and should serve as a good representation of undisturbed conditions. For the alluvial groundwater monitoring site, Colowyo intends to utilize an alluvial well drilled by Consolidation Coal Company (called A6 Updip Alluvial Well) in 1984 for their baseline hydrologic monitoring of the Danforth Coal Lease. This well is located in the same vicinity as the proposed surface water monitoring site, and should also serve as a good representation of undisturbed conditions. Both locations of the proposed New Upper Goodspring and A6 Updip Alluvial Well are shown on Map 37, Water Monitoring Sites for Permit CO-019-81. Additionally, the A6 Updip Alluvial Well completion report and available data is included in the following pages.