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Rule 4.05 I~ 4.05.9 Impoundments 4.05 HYDROLOGIC BALANCE Two of the four impoundments constructed for sediment and drainage control were approved by the DMG as permanent facilities in November 1985. They are Pond HG-8 (NPDES outfall No. 004) and the Shop pond (NPDES outfall No. 003). Pond 001 (Explosive Storage Area pond) and Pond 002 (Landfill Area pond) were reclaimed in 1996 as part of the Phase I Bond Release request for the facilities azea. Previous HGCC submittals to DMG (August 12, 1991; TR-60) have demonstrated that the drainage areas for the Shop, Explosives and Landfill ponds all generate zero runoff, hence zero sediment and outflow. References on pond design can be found in Appendix A, Volume II, Exhibit K, Exhibitr Volume I and Exhibit U in Exhibits Volume II of the initial permit application. 4.05.13 Surtace and Ground Water Monitoring The DMG relieved HGCC of all surface-water and groundwater monitoring requirements as pazt of its Phase II/Phase III findings. A copy of the letter regarding cessation of the monitoring program is included in Attachment D of TR-68. All surface and groundwater monitoring doting mining was conducted in accordance with DMG approved monitoring plans and methods. Water monitoring equipment, devices and structures were removed in accordance with Rule 4.07 except for wells and devices used for current, ongoing water sampling. Current water sampling procedures and sites aze described below and monitoring sites aze shown on Map 4, Environmental Monitoring and Sampling Sites (see map pockets in Exhibits). • Ground Water Groundwater monitoring wells were abandoned in October 1998 per Division of Water Resources regulations. Abandonment reports were included in the 1998 Annua! Hydrology Report. Sertion 2.04.7 (Volume I), Appendix L {Volume 5), and Appendix R (Volume VII) of the initial permit application contain information on groundwater. Current groundwater monitoring at the mine consists of semi-annual sampling of two monitor wells and semi-annual water level readings of a third well. Well HG-1 is located down dip of the reclaimed shop area, HG-2 is located down dip of the reclaimed mine area and UC-2 is located west of the previous mine facilities area. Wells HG-i and HG-2 are monitored for water quality and water levels in eazly summer/late spring and again in late summer/early fall. Well UC-2 is monitored semi-annually for water levels only. During the January 1987 permit renewal, the MLRD found that ground water monitoring at the mine site had provided adequate quantitative information during the fast permit term, but marginal qualitative information due to suspected grout contamination of monitor wells. Consequently, the Division imposed the following stipulation: Stipulation No. 3 THE PERMITTEE SHALL SUBMIT AN EVALUATION OF THE MINE AREA WELLS FOLLOWING DEVELOPMENT WORK AND SUBSEQUENT MONITORING ON OR BEFORE MAY 15,1987. SHOULD WELLS CONTINUE • TO EXHIBIT CHAR,ICTERISTICS OF GROUT CONTAMINATION, THE PERMITTEE SHALL SUBMIT A REVISED GROUND WATER MONITORING PLAN FOR MONITORING THE LOWER AND UPPER COAL UNITS BY MAY 15, 1987. may/u~.x cK./n~~ nw~.~ vva~.i.. 4.05-1 Revised - 06/01