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In order to evaluate patterns and quantities of mine inflows, EFCI identified all <br />significant sources of mine inflow and showed their locations on a mine workings <br />map. Inflow quantities were estimated and field water quality parameters (pli, <br />EC, temperature) measured. At a minimum, groundwater inflows were identified, <br />flow quantities estimated and water quality parameters measured on a semi- <br />annual basis. In addition, if new groundwater sources were intercepted by <br />advancing mine workings, relevant inflow information was obtained at the time <br />the inflows are first identified. <br />On completion of active mining operations, seals were constructed to isolate the <br />1st North and 2nd North Sub-Mains from the West Main entries. In addition, <br />seals were also constructed across the 2nd North Sub-Mains between the 2nd and <br />3rd and 5th and 6th panel sets and at the junctions between the 2nd North Sub- <br />Mains and the 3rd and 4th and 5th panel sets. In terms of mine water infkwv and <br />mine flooding, these seals effectively isolate the 1st North, 1.5 North, and the <br />sealed portion of the 2nd North Sub-Mains from the West Mains and other mined- <br />out areas. <br />A crosscut breakthrough connects the 1st North and 1.5 North Sub-Mains, and <br />~ the 1.5 North Sub-Mains connect directly to the 2nd North Sub-Mains at the 3rd <br />and 5th panel sets, allowing water to flow freely between these areas. With <br />progressive mine inflows •over time in these areas, water will flow downgradient <br />(to the north-northwest) within the 1st North, 1.5 North, and 2nd North Sub- <br />Mains. The low point for all flows would be the seals on the 2nd. North Sub-Mains <br />between the 5th and 6th panel sets (elevation 5,780. Flows would pool at thls <br />point and back up into the sealed portion of the 2nd North Sub-Mains and the 1.5 <br />North and 1st North Sub-Mains. The 2nd North Sub-Mains would fill to the <br />second set of seals (between the 2nd and 3rd panel sets, elevation approximately <br />5,850 and the 1.5 Sub-Mains would partially fill, before water would start to pool <br />in the 1st North Sub-Mains. Water would continue to back-up in the 1st North <br />and 1.5 North Sub-Mains until the 1.5 North Sub-Mains are full and the water <br />reaches the seals between the 1st North Sub-Mains and the West Mains <br />(elevation approximately 5,995. Once this area of the abandoned mine <br />workings are flooded, inflows would tend to saturate overlying layers and arch <br />over these areas, discharging as mine inflows to adjacent mined-out areas until <br />these areas are also flooded. <br /> <br />TR35 2.05.6-53 Revised -September 2003 <br />