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TH-201 - Piezometers installed on the lowest, second and third TH-203 benches of the Refuse Disposal Area fill to determine the level of the' piezometric surface within the embankment. NE-033: Grab samples from the sewage treatment plant intake and discharge. NEW-2: A sample from the New Elk East Portal shaft, used to assess the rate of flooding and the quality of water in the New Elk workings. NEW-3: A sample from the Apache Canyon shaft, used to assess the rate of flooding and the quality of water in the New Elk mine workings following sealing. NEW-4: A sample from the return water line shaft into the New Elk mine workings. This site is located north of the preparation plant adjacent to containment area 3, and will be used to assess the water level elevation in the mine as well as the quality of the water. Thickener This site was established to monitor flows from the New Elk Pump thickener into the New Elk workings (TR-34), once initiated. Recycling This site was established to document the pumping of water Pump from the New Elk workings at NEW-4 to the prep plant, once initiated. . The Annual Hydrology Report will be submitted on or before February 28 of each year in compliance with Rule 4.05.13(4)(c). This report will compile data collected during the previous calendar year. The analysis will include comparisons in either a tabular or graphic form with data collected previously and with predictions contained in the Probable Hydrologic Consequences section. A surface water control plan has been prepared and is shown on Map 13, Sediment and Surface Water Control Plan - East Portal and Map 14, Sediment and Surface Water Control Plan - West Portal. This plan has been developed and is currently in use to direct all surface waters from within the disturbed area through sediment control structures where the water quality can be monitored and controlled prior to discharge. Basin currently monitors and plans to continue to monitor the water quality as covered under the NPDES permits during the life of the operation, Exhibit 22, NPDES Permit. Detailed studies of the impacts and control of surface waters and their relationship to the underground hydrologic system at the New Elk Mine are being conducted through the monthly monitoring program. Map e, Regional Hydrology, shows the extensive monitoring program which Basin is conducting to ensure protection of the hydrologic balance at the New Elk Mine. A spill prevention control plan has been prepared by Basin and is on file at the New Elk Mine. Generally, this plan calls for containing any potential oil spills and preventing the material from reaching or coming in contact with existing surface water. Details of the Spill Prevention Control and Countermeasure Plan are presented in Exhibit 27, Spill Prevention Control and Countermeasure Plan. ,~~1 ~1~~~ (revised 8/29/97) 2.05-90f