PERMFILE65376 - Laserfiche WebLink

Home Browse Search

9. The haul road between the east pit areas (Cells C-D) and west pit areas (Cells A- B)will occur at the same, location as an existing unimproved road. The haul road will be approximately 15 ft wide and will be graveled with approximately 6" of gravel. The runoff coefficient for a gravel road is not expected to significantly increase local runoff to the point of needing additional drainage structures.. The haul road will cross an existing 12" CMP on the west side near the east corner of Cell A which will„remain. At the request of the landowner, the haul road will remain following mining and will not undergo reclamation as it is considered an improvement to the property., Exhibit D.has been edited to include this information, 10. The depth. of cells will be approximately 20 ft. The mining highwall slopes will be approximately 0.5H:1V. Exhibit D has been edited to include this information under Earthwork. ' 11. No structures will be constructed onsite 12. The overburden'stockpiles will occur in Cell B and Cell C as adjacent cells are stripped for mining. No overburden stockpile will occur in Cells A and D due to ` concurrent reclamation of those cells. In other words, overburden will be stripped from Cells B and D and backfilled_directly into Cells A and C respectively. Exhibit C-2 has been edited to show the location of overburden and topsoil stockpiles. . 13. Erosion control for topsoil and overburden stockpiles will be as follows: ' ,Experience with other focal mining operations shows that vegetation will naturally; establish on topsoil stockpiles and as such, topsoil stockpiles will be allowed.to naturally re-vegetate. , • The APE,N permit specifies watering of stockpiles to prevent wind erosion, ` the stormwater NPDES specifies silt fence at the toe of all stockpile slopes. , Furthermore, overburden stockpiles are expected to be backfilled into adjacent cells in a matter of.months. 14. Topsoil and Overburden stockpiles have been re-configured and,Exhibit C-2 has been edited to shoWlocations • -The topsoil stockpile has been moved to provide a 10 ft setback from the pit bqundary in Cells A and B r '• The south boundary of the topsoil stockpile is above the elevations of 100 year floodplain and will not be subject to high water from the Big - . ~ 'Thompson River. Silt fence wilt be placed at the toe of this topsoil stockpile as specified in.the NPDES stormwater management plan. Topsoil stockpiles will, :only occur in pits adjacent to active mining area. Exhibit C-2' has been edited to include when the stockpiles will occur for clarity '. , ,' . ~• The location of.the stockpile in Cell Chas been relocated away from the haul road. Exhibit C-2 has been edited to include this information.