GENERAL41635 - Laserfiche WebLink

Home Browse Search

entry. The two pipes shall then be joined so that leakage does not occur. Sufficient slope shall be provided to the entire length of pipe so that discharge to the outside of the block wall is accomplished. The coal mine waste will be placed into the now exposed mine. A rock plug or the concrete materials generated from the cribbing area, will be used as a back stop within the mine in order that the coal mine waste materials can be packed into the exposed mine. The backstop will be constructed no less than ten feet (10') north of the edge of the roof opening excavated by CONTRACTOR. The back stop will be sufficient in height and width so that the coal mine waste placed against it can not flow around it. The coal mine waste materials will be mechanically packed to refusal into the now open mine from the back stop to the block wall. However, care must be taken so as to not damage the integrity of the block wall. The remainder of the material will be deposited within the confines of the excavated cut in order to create a stable landform and to achieve a modified drainage pattern at this location. The material will be deposited in horizontal lifts of not more than two feet in thickness. Each lift shall be thoroughly compacted by wheeled equipment. Each lift shall be spread so that the base of the entire disposal area is covered. The face (south facing slope) of the each lift shall be no steeper than 4h:1V. Measurement and Payment There will be no measurement for payment. Payment for this task will be reflected in a lump sum bid under Item 1 on the Bid Schedule. This lump sum bid will cover all costs for soil salvage, mine re-opening, excavation and placement of coal mine waste materials, removal and disposal of cribbing materials, implementation of traffic control plan and other miscellaneous activities to be accomplished under this Task. Payment shall be as this task is completed and approved by the PROJECT MANAGER. Such payment shall be considered full compensation for all labor, materials, equipment and all other items necessary and incidental to the completion of Task 1. TASK 2 TOPSOIL SALVAGE AND APPLICATION Topsoil or topsoil substitute will be salvaged from the coal mine waste disposal area prior to initiating disposal activities. It is anticipated that a minimum of eight inches (S") of surface material will be excavated and removed from the footprint and sides of the disposal area. Soil shall be salvaged from anywhere within the disposal area where the coal mine waste materials will be in contact with the ground surface. This material, along with the material excavated when the mine roof is removed, will be placed to the side for later use. CONTRACTOR must take care to not further disturb the soil until it is ready for replacement. Upon completion of placement of the coal mine waste materials, the salvaged topsoil will be placed upon the coal mine waste so that the waste is completely and uniformly covered by all of the available topsoil material. Upon completion of the topsoil application, two (2) tons of certified weed free mulch shall be applied to the soil surface. Mulch shall be provided by CONTRACTOR, and shall conform to Section 20.2 of the Revegetation Specifications, attached. All mulch shall be certified as noxious weed free or noxious weed seed free by any authorized State or County Officer. Documentation of certification shall be provided to the PROJECT MANAGER Dior to application of mulch. The mulch shall be evenly distributed over the soil surface. Surface roughening will occur simultaneously with distribution of the weed free mulch in order to prevent loss of the mulch due to wind.