Laserfiche WebLink
2.05.6(3) Protection of the Hydrologic Balance <br />(a)(i) The Roadside North and South Portals mining operations will not adversely <br />affect the quality of surface or groundwater. Water pumped from underground <br />workings will be clarified by allowing sufficient settling time prior to discharge <br />into the Colorado River, and will have an insignificant impact of the quality of <br />river water. <br />Related water quality data for groundwater, water discharged into the river, and <br />Colorado River water is presented in Tab Section 7, and in Annual Hydrologic <br />Reports submitted to the Division. <br />The quality effects of mine discharge on the Colorado River is small due to the <br />extreme difference in flow rates. These effects cannot accurately be detected <br />in the receiving water by lab analysis because they are smaller than the <br />detection limits of the equipment being used, but can be calculated. The <br />• increased load of total dissolved solids, (TDS) into the river has been calculated <br />in the Annual Hydrologic Reports since 1987. Between 1987 and 1994, the <br />total TDS discharge from the mines has been from 0.006 to 0.117°/a of the total <br />TDS load in the river. The higher value is more representative of what is <br />expected in the near future. The average TDS discharge from the Roadside <br />North Mine in 1993 and 1994 was 420 tons/year and from Roadside South, <br />1,238 tons/year. The salt loading in the river at USGS gaging station <br />090955000 is approximately 1.44 million tons per year, as calculated from <br />USGS statistics on the station which is located 5 miles north of the permit <br />boundary. <br />This facility is subject to the "Regulations for Implementation of the Colorado <br />River Salinity Standards" through the Colorado Discharge Permit Program <br />30.10.0 which states that the salt load from any industrial facility shall not <br />• 17-1 (Rev. 12/16!96) <br />