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Revised 11/15/81 <br /> of the existing groundwater in the area to be affected by the Maxwell <br /> Mine and is reviewed in Exhibit 6, Hydrology and Geology Information. <br /> No significant amounts of groundwater were encountered in this study. <br /> Therefore, the Maxwell Mine's effect on the hydrologic balance is not <br /> expected to be significant. In addition, the operation of the Maxwell <br /> Mine is conducted in a conscious way to minimize the affect on the <br /> surface and all materials above and surrounding the mine so that <br /> continued safe operation of the mine is possible. <br /> Quality of the surface and groundwaters affected by the Maxwell Mine is <br /> controlled by diversion of water from the disturbed area to sediment <br /> control ponds where treatment, if necessary, can be completed. This <br /> plan for control of the surface water and groundwater pumped from the <br /> Maxwell Mine is shown on the Sediment and Surface Water Control Plan Map <br /> (Map 13) and the Mine Hydrology Map (Map 9). These diversion and <br /> sediment control structures collect all water from the disturbed areas <br /> of the surface facilities and are sized properly to ensure that they <br /> will continue to work under any adverse weather conditions. This system <br /> currently is in use at the Maxwell Mine and is functional . The <br /> treatment of the water which is discharged is based on the NPDES Permit <br /> shown in Exhibit 20, NPDES Permit. Quality of the water associated with <br /> both the surface and underground water which is present in the Maxwell <br /> Mine area is shown in Exhibit 9, Water Quality Analysis. In addition, <br /> the effect and impact on the water quality, both surface and <br /> groundwater, has been reviewed by Water, Waste, and Land, Limited in <br /> their study located in Exhibit 6, Hydrology and Geology Information. <br /> The plan which CF&I Steel Corporation plans to utilize to seal the <br /> shafts and slopes currently being utilized at the Maxwell Mine is <br /> reviewed in detail in Section 2.04.4 of this application. The plan <br /> consists of sealing the mine entrances with a minimum of 8 inches of <br /> reinforced concrete. Due to the depth which the Maxwell Mine is <br /> located, no hydraulic head from surface or groundwater is expected to <br /> develop on the seals. Therefore, no inundation or effect on the surface <br /> or groundwater after the mine is closed is expected. <br /> 2.05-44 <br />