|
Roads were pitched to allow sheet runoff to disperse into adjacent
<br />grassland.
<br />On steeper roads, roadside drainage ditches are used to collect runoff and
<br />safely discharge it. Much of the runoff from the roads. ie passed through a
<br />sedimentation pond to decrease suspended solids. Culverts are provided at
<br />intersections with drainage channels so as not to interfere with the
<br />natural stream flows.
<br />The operator presented design information on the road bridge that crossee
<br />the Williams Fork River. This bridge has been designed to safely pass the
<br />river flow resulting from a 100-year storm event.
<br />One variance from the road drainage requirements is granted to the
<br />applicant. Rules 4.03.1(4)(e) and 4.03.2(4)(e) contain specific
<br />requirements for culvert spacing to discharge water at .periodic intervals
<br />from the mine roads. The Division has not required Cyprus Empire
<br />Corporation to adhere to these spacing requirements. The roads are
<br />existing structures built before this requirement was implemented. The
<br />roads either discharge water as sheet flow or into a roadside ditch that
<br />has been designed to handle the runoff generated by a 10-year, 24-hour
<br />precipitation event. For these reasons, additional roa•~ drainage culverts
<br />were not required.
<br />Cyprus Hmpire Corporation has requested that several road segments be
<br />retained after mining. These roads include a 7,200-foot segment of the
<br />haul road connecting the Hagle No. 5 Mine with the coal processing waste
<br />pile, a 1,050-foot access road that leads south from the Hagle No. 9 Mine
<br />area to the No. SA Portal area (see Map 27), and .the access road to
<br />pond 9AP1 (approved in Technical Revision No. 22, see permit map No. 29).
<br />Surface owner consent to the retention of these roads h:is been granted and
<br />the roads aze compatible with the poet-mining land use. Therefore, the
<br />Division approves the retention of these roads in accordance with Rules
<br />4.03.1(7) and 4.03.2(7).
<br />II. Hvdrologic Balance - Rule 4.05
<br />Ground Water Information
<br />Ground water hydrology ie described within the permit application in
<br />Sections 2.04.5, 2.04.7, and 2.05.6. Additional data azid information
<br />appears in Tables 3, 4, 5, 6, 7, 11, 12, 14, 15, 16, 17, 1S, SBA, 19, 20,
<br />23, 28, 29, 30, 73, 74, 75, 76, 77, Figures 12-24, 30-3:l; Hxhibits 7, B,
<br />10, 30, 31, 32, 33; and Maps 11, 13, 14, 15, 16, 17. Descriptions of
<br />ground water occurrence, ground water monitoring, and mining impacts on
<br />ground water within the permit and adjacent areas can be: found in "Probable
<br />Hydrologic Consequences" of this document.
<br />Surface Water Information
<br />The surface water information within the permit application is found in
<br />Sections 2.04.7, 2.05.6 and 4.05.15, and in Permit Tables 20-30 and 75-77.
<br />Permit Figures 21 through 35 also include information of surface water
<br />hydrology. The regional geology and hydrology and water rights in the
<br />vicinity on the mine are shown on Maps 6 and 1B respectively. A
<br />description of surface water occurrence and mining impacts on surface water
<br />within the permit and adjacent areas can be found in the "Probable
<br />Hydrologic Consequences" section of this document.
<br />14
<br />
|