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<br />Page 3 <br />Stockpiled topsail (when it will be stockpiled over two years) should <br />be seeded to Lincoln Smooth Brome at the rate of 13 pounds per acre of <br />pure live seed, or Fairway wheatgrass at the rate of 6 pounds per acre <br />pure live seed. This rate is for a grass seed drill. If broadcast <br />seeding is used the seeding rates should be doubled. Grass should be <br />planted using a grass seed drill with agitators in the drill box, <br />double disc with depth bands and packer wheels. Ninety-five percent <br />of the seed should be planted at a depth of 1/2 incF~ to 2/3 inch. <br />Short term stockpiled topsoil could be protected with a cover crop or <br />mulch. <br />7) Weed Control: Weec control is necessary to insure a successful <br />seeding. Weeds can be controllec by mowing or spraying chemicals. <br />Mow wends wnen they are 6 to 8 inches high, leaving a 3 to 4 inch <br />stubble. Do not clip off the top of the newly seeded grass. This <br />should be done fer the first and possibly the second growing season. <br />After the first growing season and the seeded plants have reached the <br />four leaf stage, then appropriate herbicides may be used to control <br />weeds. Any chemicals used will need to be used according to <br />manufacturer's labeling. <br />8) Grazing: The area should be protected and grazing should be <br />prohibited. <br />9) Trees and Shrubs: Some trees and shrubs that could be included it <br />the revegetation of the area,.above water level, are as follows: <br />conifer trees could include Eastern Red Cedar, Rocky Mountain Juniper, <br />Ponderosa Pine, and Scotch Pine. Deciduous trees that could be <br />included are Russian Olive, Siberian Elm, Green Ash, Hackberry, and <br />Cottonwood. Shrubs that are adapted include Antelope Bitterbrush, <br />Fourwing Saltbush, Hansen Rose, Rabbit Brush, Siberian Peabush, <br />Tatarian Honeysuckle, Skunkbush, Sumac, and Lilac. <br />10) Structures: Any water inlet or outlet from an excavated area <br />should be protected with an adequate structure to prevent erosion. An <br />inlet area would need a drop structure to allow the water to enter the <br />excavated area without causing erosion. Depending on pond size after <br />gravel is removed, rip-raping may be needed to protect banks from wave <br />action. <br />11) Some river bank erosion has occurred along the South Platte <br />River. Streambank protection may be needed and it should start at a <br />stabilized or controlled point. Streambank protection should start at <br />a depth well below the anticipated lowest depth of river bottom <br />scouring. A berm between the river and pits where gravel material is <br />removed should be built and it should be wide and high enough to <br />prevent the bank from cutting by overtopping during a flood. Vegeta- <br />tive protection should be considered on the berm and upper parts of <br />the river bank. The channel capacity of the river should also be <br />maintained. A 404 permit will need to be obtained from the Corps of <br />Army Engineers for any river bank work. <br />Excavation should be maintained at an appropriate setback distance <br />between the South Platte River, property lines, and Lupton Bottom <br />Ditch. This is to prevent any possible sloughing o£ banks that would <br />disturb the adjoining property or water courses. Setback for the <br />different items mentioned above may be different. <br />