Work Methodology for clearing and grubbing of trees and shrubs
• Identify the area where the activity is to be carried out. The engineer shall establish the limits of the work and designate all trees, shrubs, plants and other things to remain. Trees identified for tree cutting shall remain until further instructions by the owner.
Clearing and grubbing
• All surface objects and all tress, stumps, roots, and other protruding obstructions, not designated to remain, shall be cleared and or/grubbed, including mowing as required except as provided below:
• Except for trees marked for cutting, all surface objects including grass, stumps, roots and other protruding obstruction not designated to remain shall be cleared and/or grubbed.
• Areas to be graded shall be cleared of all vegetation; all stumps and roots larger than 50mm (2 inches) diameter shall be removed.
• In all areas covered by cogon/talahib, wild grass and other vegetation, top soil shall be cut to a maximum depth of 150mm below original ground surface to remove the roots and unsuitable materials, or as designated by the owner.
• Perishable objects and other organic materials shall be removed and disposed off to designated disposal.
• Except in areas to be excavated, stumps holes and other holes shall be backfilled with suitable materials and compacted to required density.
• Top soil of the areas to be stripped as indicated. Shall be removed at the depth that the Engineer requires. Stripped soil shall be at least 150mm in depth.
• Stripped soil shall be transported, deposited in stock pile, at approved location. Top soil shall be kept separated from other excavated materials.
• Top soil shall be completely removed to the required depth from any designated area prior to the beginning of regular excavation for foundation.
• Areas below the design elevation shall be back filled with cut materials or imported materials comply with the contract requirements for subgrade.
• Fill materials shall be compacted 95% of the modified dry density (ASTM D1557) of the soil.