Laserfiche WebLink
EXHIBIT D Mining Plan <br />Mining of the South Pit will continue as the past two decades, with bulldozer, front end loaders, and <br />possibly excavator utilized to remove soils and gravel materials for front end loader muck and carry to <br />portable crushing and screening equipment set up on the property at appropriate time intervals to <br />produce various gravel products, primarily Class V gravel material. Due to low volume requirements at <br />this site, portable crushing and screening systems will be on the property at large intervals of time, <br />possible a year or two depending on the local gravel demand. Over the past several years, the pit has <br />marketed an average of 5000 cubic yards of gravels annually. The mine operator does not see this <br />demand changing substantially over the next several years. However, an increase in permit acreage is <br />critical in order to be capable of bidding on local road material contracts as well as addressing the long <br />term aspects of the gravel resource and its eventual land use. <br />The site is a grass covered, low sloping dry land meadow over the entire mining area. Scant woody plant <br />and tree vegetation is found along Froze Creek, 100' north at closest proximity to the north permit <br />boundary. Approximately six inches of topsoil is removed from the surface with a front end loader and <br />transported to a topsoil stockpile area located in the south central portion of the permitted area. <br />Mining will continue in the western third of the proposed expanded acreage (current work area) until <br />gravel resources are expended, at which time the approximately 10 acre area will be reclaimed via final <br />grading to no more than 3:1 final slopes, dozer ripping (minimum 18 "depth) of the final graded areas <br />especially the pit floor and truck loading areas, and re- covering the disturbed area with a minimum of six <br />inches of planting medium (top soil) prior to disking or ripping the surface and seeding with a dry land <br />grass mixture and mulch application to support seed germination and survival. Mining will continue <br />from west to east across the permit area in three phases that will be initiated as volume demand <br />dictates. However, it is estimated that an 8 -10 year interval of time will likely occur between present <br />phase one and initiation of phase two area and a similar time frame for phase two -phase to phase three <br />transition. Phase boundaries will be clearly marked with t -posts located along the north and south <br />permit boundary lines. <br />A 8 -10' visibility berm will be constructed along the south boundary of the property set back a minimum <br />10' and maximum 20' from the property boundary along County Road 305. A cross section of the <br />visibility berm is included as an inset in the Mining Plan Map Exhibit C. The berm will be re- vegetated in <br />a similar manner as the mining area. The berm will remain after mining. <br />The gravel resource will be removed to a maximum depth of 15- 18'from the present surface elevation. <br />At maximum soil and overburden levels, final pit floor may approach 30 feet from original surface. <br />Final pit floor elevations will vary depending on the gravel thickness removed at that location but the <br />final floor elevation over the extent of the excavation will not allow for day - lighting or potential storm <br />derived water accumulation exiting from the final pit area. The porous sand and gravelly soils <br />underlying the gravel deposit will allow for rapid percolation of any water that might collect due to <br />storm event or rapid snow melt off. <br />4 <br />