Trenches for drainage conduits shall be excavated carefully to the required grade as indicated on the drawings with due allowance made for the minimum depth of bedding material required. Trench widths shall be a minimum of twice the conduit external diameter (pipe) or width (culvert). The Contractor shall remove any trees, roots, stumps or other obstructions which interfere with the construction of the drainage works.
When such unsuitable dirt is discovered, the Vendor will inform the Supervisor, who will determine the extent of the removal of such dirt and the type of dirt to be used as replacement. Removal and replacement of the unsuitable dirt will be at a rate to be agreed. Where soft clay or silt or other unsuitable dirt occurs at the completed excavated area excavation grade, such dirt will be removed and replaced with suitable excavated area base dirt.
Excavated area excavation for any drainage conduit will not be commenced until sufficient resources (including plant, equipment, pipes, culverts, bedding dirt, back fill dirt) are on site to ensure that construction of the particular drainage conduit may be completed in a swift orderly operation. Loose dirt at the bottom of the excavated area excavation as a result of over excavation will be removed if so directed by the Supervisor and replaced with approved bedding dirt at the Vendor's cost.
The Vendor will, at his own expense, do all things necessary to keep the excavated areas free from water during the construction of the drainage conduit. This will include preventing flood water, run-off water or other extraneous water from entering the excavated area; the installation, if necessary, of a dewatering system to prevent the ingress of groundwater; and the provision of all pumping requirements to ensure that any water entering the excavated area is immediately removed. The Vendor will comply with all Construction Safety Act Regulations relating to safety of the drainage works by ensuring that barricades are installed around excavations, ramps are available within excavated areas, excavations are shored where necessary, and otherwise complying with all other requirements of the regulations.
The Contractor shall not permit pumped water to discharge on to any areas of existing plant, or on to any areas of earthworks being constructed, but shall ensure that all pumped water discharges into appropriate drainage channels.
When such unsuitable dirt is discovered, the Vendor will inform the Supervisor, who will determine the extent of the removal of such dirt and the type of dirt to be used as replacement. Removal and replacement of the unsuitable dirt will be at a rate to be agreed. Where soft clay or silt or other unsuitable dirt occurs at the completed excavated area excavation grade, such dirt will be removed and replaced with suitable excavated area base dirt.
Excavated area excavation for any drainage conduit will not be commenced until sufficient resources (including plant, equipment, pipes, culverts, bedding dirt, back fill dirt) are on site to ensure that construction of the particular drainage conduit may be completed in a swift orderly operation. Loose dirt at the bottom of the excavated area excavation as a result of over excavation will be removed if so directed by the Supervisor and replaced with approved bedding dirt at the Vendor's cost.
The Vendor will, at his own expense, do all things necessary to keep the excavated areas free from water during the construction of the drainage conduit. This will include preventing flood water, run-off water or other extraneous water from entering the excavated area; the installation, if necessary, of a dewatering system to prevent the ingress of groundwater; and the provision of all pumping requirements to ensure that any water entering the excavated area is immediately removed. The Vendor will comply with all Construction Safety Act Regulations relating to safety of the drainage works by ensuring that barricades are installed around excavations, ramps are available within excavated areas, excavations are shored where necessary, and otherwise complying with all other requirements of the regulations.
The Contractor shall not permit pumped water to discharge on to any areas of existing plant, or on to any areas of earthworks being constructed, but shall ensure that all pumped water discharges into appropriate drainage channels.
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