_GENERAL DOCUMENTS - C1981017 (232)

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(5) Dependent upon conditions, it may be necessary to construct one or more under - drains near the base of the disposal facility. The purpose of the drains is to allow ground water which may be present at the fill area(s) to drain from the fill without saturating the coal refuse material. A typical drain dimension is shown in Figure 1, Typical Underdrain. Note that the drain length is unknown, and that cross sectional area may vary based upon site conditions. PROJECT MANAGER will make such determination prior to CONTRACTOR initiating fill operations. Underdrains, if constructed, will be built to the specifications described in Task 7, Underdrains. These features will be paid per the price bid in Item 7 of the Bid Schedule per lineal foot installed. Site and material conditions are such that extremely dusty conditions may result from the excavation, hauling and deposition of refuse and topsoil materials. PROJECT MANAGER may require CONTRACTOR to implement a dust control procedures throughout the project area. Such practices, such as applying water to work areas and roadways, are considered to be normal construction practices, and shall not result in additional expense to OWNER. Measurement and Payment There will be no measurement for payment. Payment for this task will be reflected in a lump sum bid under Item 2 on the Bid Schedule. This lump sum bid will cover all costs for topsoil removal where necessary, excavation of coal refuse from the Old Refuse Pile, fill as required at the Old Refuse Pile, transportation and disposal of coal refuse at the designated disposal facility near the wash plant, and creation of the design slopes at the Old Refuse Pile and at the disposal facility. Payment shall be as this task is completed and approved by the PROJECT MANAGER. TASK 3 TOPSOIL PLACEMENT Upon completion and PROJECT MANAGER approval of the excavation activities, topsoil will be applied to the north facing slope of the Old Refuse Pile created during performance of Task 2, Earth Work. Topsoil will be derived from that material stockpiled during performance of Task 2, Earth Work, and from an existing topsoil stockpile (Map 3, Project Area). The approximate distance from the west end of the project area to the topsoil stockpile is 3,900 feet. It is estimated that 8,550 cubic yards of topsoil will be needed to achieve an average six inch (6 ") cover of material over the face of the north slope. This material will be derived primarily from the topsoil stockpile to be removed to the project site. Any additional volume necessary will be derived from other sources approximately the same distance from the Old Refuse Pile as the topsoil stockpile. Upon completion of excavation of the topsoil from the stockpile, the ground surface is to be graded and shaped so that the foot print of the stockpile and any adjacent areas disturbed during performance of this contract blends with surrounding, adjacent topography. The ground surface shall be left in a roughened condition. No slope will be steeper than 2.5H:1V, 16