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will continue to be responsible for adhering to the monitoring requirements of its CDPS permit. Thus, this <br />AHR only addresses the data required under the TC monitoring plan: <br />u <br />• <br />• Bedrock well TR-7A, <br />• Alluvial well AVF-5, <br />• Surface sites WF-1, WF-2, <br />• CDPS (permit CO-0034142) sites: <br />0 1) mine dischazge No. 5 Mine sump [CDPS Outfa11003 or SD]; <br />0 2) mine dischazge 7 North Angle Well Bore [CDPS Outfa11024 or 9P3], and <br />0 3) spring -No. 1 strip pit [CDPS Outfa11022 or 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 monitoring plan). Field parameters aze 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 />Three sandstone aquifers are found beneath the subject site. In ascending order, they aze: Trout Creek <br />Sandstone, Middle Sandstone, and Twentymile Sandstone. The Eagle No. 5 and Eagle No, 6 Mines aze <br />3.1.1 Bedrock Wells <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 />pazameters on an annual basis, with no water quality analyses required. Field parameter data for TR-7A, <br />suggests no adverse impact or trend. 2003 field parameters aze provided on Table 5. A summary of POR <br />water quality data is provided on Table 6. POR water levels and conductivity readings are presented in <br />Figures 3 and 4, respectively. Historica]ly, well 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 or 9P3). While mining is in TC, the mine is being flooded and pumps were run <br />only periodically to maintain appropriate mine water ]evels. The Eagle No. 5 Mine sump dischazge is CDPS <br />Outfall 003 or SD. Under TC, monitoring of these sites remains the same as in the active mining monitoring <br />plan. <br />I:\Env\Empire\P.HR\2003\Text\Empire2003AHR.doc <br />3 <br />