Kingscote Streets Upgrades - Kangaroo Island Council

3.3.3 Clearance of Surface Vegetation
Prior to the stripping of topsoil, the Contractor is to remove existing surface vegetation, and dispose
off site to a legal place of disposal.
3.3.4 Removal of Trees
Trees shall be removed only where necessary for construction of the works, where nominated on the
drawings or as otherwise directed by the Superintendent. Where trees are to be removed in areas
of proposed structures, stumps and root systems shall be removed to a depth of at least 1.0 m
below formation level
The excavation shall be backfilled with suitable material placed and compacted in layers of 225 mm
maximum thickness to a density at least that of the adjacent undisturbed natural material.
3.3.5 Removal of Rubbish
The Contractor is to remove and dispose of the rubbish material on the site as indicated on the
drawings.
3.3.6 Stripping and Re-spreading of Topsoil
Topsoil shall be stripped from all areas of construction to a nominal depth of 75 mm and shall be
stockpiled on site for later re-use in filling to road reserves, nature strips, batter slopes etc.
Stockpiles shall have adequate drainage and erosion protection and be protected from
contamination by other excavated material, weeds and building debris.
The Contractor shall provide details of proposed temporary topsoil stockpile locations, for approval
by the Superintendent.
Following completion of earthworks topsoil shall be spread on all batters and other areas designated
in a layer with a thickness as specified with the surface of the topsoil after free of lumps greater than
75 mm.
Any topsoil not required for such re-use, or topsoil surplus to requirements, shall be removed from
the site by the Contractor.
3.3.7 Excavation
3.3.7.1 General
The Contractor shall judge for itself the nature of the material to be excavated and will be deemed to
have made due allowance for excavating material of whatever nature may be encountered,
providing that, in the opinion of the Superintendent, it is capable of being excavated by a mechanical
excavator with a capacity appropriate for the situation, without the use of a rock breaker, jack
hammers and/or blasting.
Overcut shall be made good to the satisfaction of the Superintendent at the Contractor's expense.
In the event that soft spots are revealed in the formation, the Contractor shall immediately notify the
Superintendent. If the Superintendent deems it necessary, the Contractor is to carry out further
excavation as directed and backfill the excavation with material selected by the Superintendent.
The cost of the additional excavation and backfilling will be considered as an extra to the contract.
The Contractor must obtain prior approval from the Superintendent prior to the excavation of soft
spots otherwise no claim will be entertained. The Contractor is to record measurements for the
calculation of the volume of additional excavation and filling, and submit these to the Superintendent
for approval.
3.3.7.2 Bulk Excavation
The excavated areas shall be finished to an even surface. The floors and sides of excavations shall
be trimmed to the lines, levels, grades and batters shown on the drawings and within the tolerances
specified.
Ref No. 20120236SA1 Kingscote Streets Upgrades Technical Specification 5