Laserfiche WebLink
r ~ p-q <br />The third step in the reclamation process will begin when <br />mining is completed. The overburden stored in berms to the <br />north and south of the phase 5 mining area will be back- <br />filled and graded to a 3:1 or flatter slope on three sides. <br />As noted previously, the floor of the mine and the final <br />grade will decline slightly to the west in order to pre- <br />vent excessive run-off down the benches to the east. The <br />benches will also be backfilled with overburden to a 3:1 <br />or flatter grade to a minimum depth of 12". Distribution <br />of all topsoil will be done as part of the seedbed prepa- <br />ration. <br />1) Seedbed Preparation <br />When the topsoil is first stockpiled for future use, it <br />will be shaped to allow seeding with a grass drill. The <br />seed mixture to be planted will be predominantly intro- <br />duced grasses such.-as crested wheatgrass r fairway crested <br />and about~l0%~e-1=~Q3~sweetcloy~z,rPt"will be seeded at a ~VG <br />rate of about 21bs LS/ac. in order to assure coverage <br />and to prevent erosion. We will follow SCS recommendations. <br />When mining is completed and prior to distribution of top- <br />soil, the entire seedbed area will be scarified to a depth <br />of 12 - 15" to provide better cohesion between the topsoil <br />and overburden. Following final distribution of topsoil at <br />a depth of 6 - 8" and compaction, seeding will be done with <br />a grass drill. (Topsoil preserved from 7.4 acres in phases <br />4 & 5.at'a depth of 12" will provide 113+% of requirements <br />if distributed 8" deep for all areas backfilled.) <br />2 Seeding & Seed Mixture <br />Weather permitting, seeding will be done after October 1st., <br />when the ground is too cool for seed germination, but before <br />May 1st., in order to take advantage of optimum moisture <br />conditions and to get a headstart on annual weeds. <br />The following grass seed mixture has been developed in <br />consultation with the USDA-SCS Office serving Gunnison <br />County. It is intended to seed at a rate of 40 PLS/sgft.. <br />Species $~~~}0~5~e %of Mix ~~PLS/ac x 9.9 Tota14~ ~, <br />~~ <br />CrestedldG. 10 30 3.0 30 3~ <br />Smooth Brome 13 30 3.9 39 2 % '~~ ~T'' <br />Arizona Fescue 4.5 20 0.9 9 ? i <br />Indian Rice G. 12.5 10 1.2 12 /~ <br />Y1.SweetClov. 7.0 10 0.7 7 °' <br />/ V <br />9.7 97 <br />Source: USDA-SCS Gunnison District Office ~~~ <br />