2009-03-02_PERMIT FILE - C1980004A (4)

Home Browse Search

- ~ 3-8 3.3 Topsoil Placement Prior to placement of topsoil on regraded areas, the regraded material will be conditioned with dozer-mounted scarifiers in order to minimize the interface between topsoil and subsoil and to promote establishment of vegetation and maximize slope stability. Topsoil will be placed in lifts of approximately 4" to 8" in thickness. The entire affected surface will subsequently be graded and leveled to achieve the final desired contour of the topsoil layer as shown on Figure 3.1-1. The placement of topsoil will be in a manner that will allow for the even distribution of materials throughout the disturbed area from which topsoil was previously removed and which exhibited salvageable material prior to disturbance. The portion of disturbed land located on the canyon floor is primarily associated with and office, stockpiles, road construction and a sedimentation pond. Topsoil will be placed only when in a moderately dry condition in order to minimize clods and compaction, which can result from multiple passes with scrapers or other equipment. Placement of topsoil will be inspected as necessary to assure proper depth and soil densities (80 to 95 pounds per cubic foot dry density) are achieved. Disturbances created after the initial mine site construction that lie in an AVF (sediment pond and topsoil stockpile area) will be restored to the original ground elevation and slope and topsoil will be replaced to original topsoil thickness that existed prior to disturbance (Ntwo feet). The construction material stockpile and material storage areas will be restored to approximate original contour and have approximately one foot of topsoil replaced. The office area disturbed in 1989 that lies in the AVF, will be restored to approximate original contour, and the original topsoil thickness that existed prior to disturbance, (Ntwo feet) will be replaced. The new sediment pond will be reclaimed following successful revegetation of the bench area disturbances. Since there is no excess topsoil, remaining areas will be revegetated directly on existing regraded surface material. TR-16 M`-Volume 1 (Rev 10/08)