The bedding material shall be compacted to the Characteristics Dry Density Ratio as specified for ‘Embankment Construction’ in Specification 302 EARTHWORKS, with a testing frequency in accordance with Specification 201 QUALITY SYSTEMS. Select Bedding Material 405.31 HANDLING OF PRECAST UNITS Pre-cast units shall be handled and installed in such a manner that no cracking or any other non-conforming defect occurs outside the acceptable limits given in Specification 404 CULVERTS Annexure 404B. Damaged pipe and box culverts shall be repaired or replaced in accordance with Annexure 404B at no cost to the Principal. Damaged Concrete Units 405.32 BACKFILL AND COMPACTION Prior to backfilling the Contractor shall certify to the Superintendent that compliance has been achieved with all specified requirements. HOLDPOINT Unless otherwise shown on the Drawings backfill material up to sub-grade level shall be embankment material placed and compacted to the requirements as specified for ‘Embankment Construction’ in Specification 302 EARTHWORKS, with a testing frequency in accordance with Specification 201 QUALITY SYSTEMS. Below Subgrade Unless otherwise shown on the Drawings backfill material above sub-grade level shall be pavement material placed and compacted in accordance with Specification 501 PAVEMENTS, with a testing frequency in accordance with Specification 201 QUALITY SYSTEMS. Above Subgrade Backfilling and compaction of stormwater drains shall be carried out in accordance with Specification 404 CULVERTS. All conduits connecting to the drainage structure that are damaged by the backfilling and compaction processes used by the Contractor, shall be repaired or replaced at no cost to the Principal. Damage 405.33 PAVEMENT REINSTATEMENT Where a structure is constructed within an existing road pavement, the pavement on the existing road shall be reinstated by the construction of the appropriate pavement layers with thicknesses as shown in the Drawings. Reinstatement The edges of the excavation shall be saw cut straight and the excavation backfilled to the requirements of Clauses 404.26 ‘General’ and 404.32 ’Backfill and Compaction’ respectively. The pavement layer(s) shall be constructed to the relevant requirements of Specification 501 PAVEMENTS. Edges & Pavement Bituminous surfacing and asphalt shall be applied in accordance with requirements of Specification 503 BITUMINOUS SURFACING and Specification 504 ASPHALT SURFACING respectively, with the top surface finished level with the surrounding existing sealed surface. Surfacing A waterproof seal shall be placed between the new and the old surfaces. Waterproof Seal 405.34 DRAINAGE STRUCTURES
Unless otherwise detailed on the Drawings the provisions relating to in-situ concrete drainage structures shall apply to drainage structures of brick construction where such method is a specified alternative. Bricks be well wetted before use and every course shall be set in a full bed of cement mortar with all joints solidly filled. Walls shall be properly bonded, fair faced and flush pointed internally. Pointing No bats or broken bricks will be allowed, except where necessary for closers. Mortar joints shall not be thicker than 10mm, but some variation is permissible where brickwork is used to adjust the height and slope of catchpit and gully frames. Mortar Thickness 405.34.04 PRECAST CONCRETE LINERS Unless otherwise detailed on the Drawings the provisions relating to in-situ concrete drainage structures shall apply to those of precast concrete liner construction wherever relevant. Holes of sufficient size to accommodate entry and exit pipes shall be cut or punched out in accordance with the manufactures published requirements without cracking the liner or causing unnecessary damage. The hole to accommodate the pipe shall be no greater than the pipe diameter plus 100mm. Cement mortar, or an approved Epoxy mortar shall be used in sealing around holes formed in structures to accommodate entry and exit conduits. Liner Holes 405.35 STEP IRONS Where the depth of manholes and gullies are greater than one metre, step irons shall be provided at 300mm intervals in height unless otherwise shown on the Drawings. 405.36 REMOVAL OF EXISTING DRAINAGE STRUCTURES Where detailed on the Drawings, redundant drainage structures located under roadways shall be removed and disposed of by the Contractor to the Contractor’s disposal site, or an authorised waste disposal site or a site approved by the relevant Local Government Authority. Removal Voids left from the removal of a drainage structure, not intended to be replaced shall be backfilled and compacted with embankment quality material in accordance with Specification 302 EARTHWORKS or Pavement Material in accordance with Specification 501 PAVEMENTS, as required by this Specification. Voids 405.37 DAMAGE TO EXISTING STRUCTURES If during construction of the Works, the Contractor causes damage to any drainage structure that is not to be removed or disturbed, the Contractor shall repair the damage or replace the damaged structure to the requirements of this Specification at no extra cost to the Principal. 405.38 ADJUSTMENTS OF EXISTING GULLY GRATES AND MANHOLE COVERS