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• Figure 2. <br />As mentioned in the Introduction, Technical Revision TROI-32 was approved in 3une 2001. TR 01-32 <br />allows for suspension of many DMG hydrologic monitoring requirements while the mine is in TC. BTU EC <br />will continue to be responsible for adhering ro the monitoring requirements of its CDPS permit. Thus, this <br />AHR only addresses the data required under the TC monitoring plan: <br />• Bedrock well TRJA, <br />• Alluvial well AVF-5, <br />• Surface water sites (Williams Fork) WF-1, WF-2, <br />• CDPS (Permit CO-0034142) sites: <br />0 1) Mine discharge No. 5 Mine sump [CDPS Outfa11003, a.k.a. site SD]; <br />0 2) Mine discharge 7 North Angle Well Bore [CDPS Outfa11024, a.k.a. site 9P3], and <br />0 3) Spring - No. 1 StripPpit [CDPS Outfall 022, a.k.a. site 1SP]. <br />Table 1 presents a summary of hydrologic monitoring requirements for these sites under TC (modified from <br />TROT-32, Appendix D of the TC monitodng plan). Field parameters are outlined in Table 2. Water quality <br />monitoring includes field parameters (Table 2), surface water quality parameters (Table 3), and CDPS <br />parameters (Table 4). <br />3.1 Groundwater Monitoring <br />3.1.1 Bedrock Wells <br />Thtee sandstone aquifers are found beneath the subject site. In ascending order, they are: Trout Creek <br />Sandstone, Middle Sandstone, and Twentymile Sandstone. The Eagle No. 5 and Eagle No. 6 Mines are <br />located between the Trout Creek Sandstone and the Middle Sandstone. <br />Middle Sandstone: Under TC, Middle Sandstone well TR-7A is measured for water level and field <br />parameters on an annual basis, with no water quality analyses required. Field parameter data far TR-7A, <br />suggests no adverse impact or trend. 2005 field parameters are provided on Table 5. A summary of POR <br />water quality data is provided on Table 6. POR water levels and conductivity readings ue presented in <br />Figures 3 and 4, respectively. Historically, welt TR-7A has indicated a slight reduction in concentrations of <br />major ions over time. <br />3.1.2 Mine Water Discharge <br />Following approval of the TC Monitoring Plan, meter readings were no longer recorded for the 7 North <br />• Angle site (CDPS Outfall 024, a.k.a. site 9P3). While mining is in TC, the mine is being flooded and pumps <br />run periodically to maintain appropriate mine water levels. The Eagle No. 5 Mine sump dischazge is CDPS <br />3 <br />I:\Env\Empire\AH R\2005\Text\Empire2005AH R. doc <br />