Laserfiche WebLink
/ The fotlawitrg text in Section 780.21(6), throug/i page 780-175, is retained in the permit for /rislorica! <br />~rejerence. The current permit tent discussion addressing protection of !!re Hydrologic balance begins on page <br />Permit Rerrewa! 780-244-I. / <br />Section 780-21(6) -Continued) <br />Surface Water Oualiri Protection <br />Surface Water HydroloeV <br />The surface water hydrology of the proposed permit area is characteristic of a high-altitude, semi-arid <br />environment. Most of the area is drained by ephemeral streams which flow only in response to spring snowmelt or <br />extremely heavy summer rainstorms. The general area contains two intermittent streams, Foidel Creek and Middle <br />Creek, and one perennial stream, Fish Creek. Several man-made ponds exist within the mine plan area and are <br />used primarily for stock water supply and sedimentation purposes. All surface water features of the general area <br />and the mine plan area are shown on the Twentymile Park Hydrology (Map 6), on the Energy Mines Nos. I and 2 <br />Hydrology (Map 13), and the Eckman Park Hydrology (Map 14). Detailed information on the surface water <br />• Hydrology is set forth and referenced under Section 779.16. <br />Impacts of Minine on Surface Water Oualiri <br />Mining activities in the mine plan area can create changes in the existing surface water quality. Mining practices, <br />such as removing and stockpiling topsoil, vegetation clearing, haulroad construction, construction of excess spoil <br />stockpiles, and vehicular travel, will increase runoff rates and provide the potential for increased erosion and <br />increased total suspended solids (TSS) concentrations of streams. Mining practices, such as detention of water in <br />sedimentation and other structures, pumping water out of certain pits, and potential leaching of excess spoil <br />stockpiles, can increase salt loading or total dissolved solids (TDS) concentrations of streams. Salt concentrations <br />in sedimentation ponds or other water detention structures will increase slightly as a result of evaporation, which <br />can also leave a diminutive effect on surface water quantity, which is discussed later under this Section. Within the <br />mine plan areas there exists one unique operation where mining is progressing downdip. Tltis operation is at the <br />location of the existing Marion 8050 dragline in Mine No. L In this location <br />• <br />1996 Permit Ren. Permit Renewal 780-145 Revised?/10/97 <br />