PERMFILE58063 - Laserfiche WebLink

Home Browse Search

individuals. k'hile this approach is time consuming, it has resulted in more realistic shrub density values. In the 1985 monitoring study, time constraints prevented the deliberate evaluation of each density plot and, thus, the numbers presented in the report may actually be lower than what exists on site. r1 LJ PCC has continued to maximize the use of direct haul topsoil replacement in reclamation activities, while improvements in brush removal techniques have increased the amount of salvageable topsoil. Prior to the salvaging of topsoil, the brush is removed and pushed into piles with dozers. These piles are then "rolled" to drop as much of the remaining topsoil out as possible. This method also aids in the recovery of viable plant propagules which greatly improve the level of natural regeneration of native grasses, fortis, and shrubs. Evaluations of revegetation procedures and revegetated communities at the Seneca Mine have resulted in changes in the seed mixes in the last several years. These changes were made to balance the more aggressive species in the mixes and increase the number of native species while reducing the total number of introduced species or the seeding rates of the remaining introduced species. Thus, in 1984, the seed mixes were adjusted by reducing the individual rates of species such as common timothy, Canada bluegrass, and alfalfa, and adding additional native species such as big bluegrass and basin wildrye. The seed mixes were further refined and presented as part of the Seneca permit renewal submittal in early 1986. The rates for a number of species were adjusted and the overall rate of seeding was reduced. Alfalfa was changed to a rangeland type alfalfa variety and the rate eras reduced to 0.25 PLS lb/acre. In addition, the supplemental forb and shrub seed lists were refined. The intent of these changes were to reduce the rates of some of the more aggressive species and establish a revegetation community that may be more compatible with forb and shrub establishment. For the last several years, shrub seed has been added to the seed mixes used at the Seneca Mine. The following lists the supplemental shrub seed used in years.1981-1986: 1981 Colorado columbine Yarrow Golden tuft Batchelor button Purple coneflower Lewis flax Mt. Phlox Lupine Primrose R. Mt. Penstemon Blackeyed sysan • Total .4tirr:erz -.t Lbs. Bulk 50 50 50 50 50 50 50 50 50 50 50 550 1.6 PLS ~s 27 Revised 8/27/86