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• A. SURFACE WATER <br />To monitor potential effects of the mining operation on the adjacent surface waters of Goodspring <br />Creek, the New Upper Goodspring (NUGSC) stream site is utilized to chazacterize conditions <br />found upstream of mining activity and the Lower Goodspring (LGSC) stream site is utilized to <br />chazacterize conditions found downstream of mining activity. The Lower Taylor Creek (LTC) site <br />is utilized to characterize conditions found downstream of the West Pit mining and the Loadout <br />azeas. <br />Goodsprine Creek <br />During 1999, field monitoring and laboratory analysis at both the New Upper Goodspring Creek <br />(NUGSC) and the Lower Goodspring Creek (LGSC) sites did not indicate any results or trends that <br />are problematic from a quality or quantity aspect. The data continues to show normal anticipated <br />seasonal variations in selected constituents. <br />In correspondence dated March 30, 1999 the Division correctly noted that the level of TDS had <br />risen approximately 500 mg/I (1000 to 1500) at the LGSC site around 1984. Corresponding rises <br />were also noted in calcium and sulfates. A review of the current data indicates that the <br />concentrations appeared to peak around 1990 and have gradually lowered ever since. <br />To characterize the upstream condition, the Upper Goodspring Creek (UGSC) site had been utilized <br />prior to using the NUGSC monitor site. Exhibit 4 of the 1992 AHR provides information on the <br />• UGSC site. The data indicates that the original upstream Goodspring Creek (UGSC) site also <br />experienced a corresponding rise in TDS, calcium and sulfates as well. The data suggests that the <br />changes in Goodspring creek aze natural fluctuations and not mining related. <br />~ylor Creek <br />The flows in Taylor creek continue to reflect more "normal" regional weather conditions as <br />opposed to the near drought conditions we have experienced during the recent past (pre-1996). <br />Taylor creek maintained some limited but continuous flow in 1999. No changes in water quality <br />were evident. <br />To summarize, a review of the surface water monitoring data suggests that Colowyo is not <br />significantly impacting the hydrologic balance of the surface waters in the general area or Permit <br />azea. <br />B. GROUNDWATER <br />To monitor any potential groundwater impacts due to the Gossazd Coal Loadout facility, Colowyo <br />currently utilizes one down gradient monitoring well (Gossazd Well). To monitor any potential <br />groundwater impacts due to mining activities, Colowyo currently utilizes one down gradient <br />monitoring well (North Goodspring Well) and one up gradient monitoring well (A-6 Well). <br /> <br />2 <br />