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    4. QA-4 Survey Plan (s223) Approval
    5. QA-5 Final Sign Off (s224c) Application Requirements
    6. QA-6 As-Built Information
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  5. Design Standards
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  7. Approved Materials
  8. Construction Standards
    1. CS-1 General
    2. CS-2 Site Clearance
    3. CS-3 Earthworks
    4. CS-4 Excavation
    5. CS-5 Excavation in Trench
    6. CS-6 Fill
    7. CS-7 Bedding & Backfill
    8. CS-8 Subsoil Drainage for Earthworks & Roads
    9. CS-9 Pipework
    10. CS-10 Pipe Fittings
    11. CS-11 Manholes & Rodding Eyes
    12. CS-12 Sumps
    13. CS-13 Trenchless Technology
    14. CS-14 Road Ripping
    15. CS-15 Road Pavement Layers
    16. CS-16 Kerb & Channel
    17. CS-17 Concrete Work
    18. CS-18 Carriageway Surfacing
    19. CS-19 Roadmarking
    20. CS-20 Berm Features
    21. CS-21 Street Structures
    22. CS-22 Road Maintenance
    23. CS-23 Grassing & Turfing
    24. CS-24 Vegetation Planting & Gardens
    25. CS-25 Reinstatement
  9. Inspection & Testing Requirements
    1. IT-1 General Provision
    2. IT-2 Streetscape
    3. IT-3 Reserves
    4. IT-4 Transportation Network
    5. IT-5 Stormwater
    6. IT-6 Wastewater
    7. IT-7 Water Supply
    8. IT-8 Public Lighting
    9. IT-9 Network Utilities
Infrastructure Development Code

CS-23.2 Topsoil Sreading/Re-spreading


Unless instructed otherwise the Contractor shall use topsoil stockpiled as part of the site clearance works. Should there be a shortage of stockpiled topsoil then the Contractor shall obtain the approval of the Engineer for the importation of topsoil from sources external to the Site.

All topsoil shall be spread to a uniform layer thickness, as shown on the approved drawings or as instructed by the Engineer, over all exposed earthworks surfaces to be grassed. The topsoil shall be clean friable soil, free from excessive amounts of gravel, have less than 20% sand and have no other debris or fragments which, in the opinion of the Engineer, could affect later plant growth or maintenance. 

The topsoil shall not be spread when the ground or the topsoil is excessively wet or plastic or otherwise in a condition detrimental to successful construction of the work. If the Engineer approves placement of the topsoil when it is wet or plastic then it shall be loosely spread and traffic kept off and the topsoil allowed to dry before being worked. 

For larger scale spreading, the topsoil shall be smoothed with a chain-harrow or similar towed by a light tractor to produce a smooth, evenly graded, open textured surface, free draining and which will not pond water. All minor depressions, wheel marks and other irregularities shall be eliminated.

For smaller scale spreading, the topsoil shall be lightly compacted or consolidated and shall be laid proud of adjoining features (such as kerb and channel, path, crossings, etc) by not more than 25mm to allow for settlement provided that it does not cause water to pond on any footpath or vehicle crossing area.

All finished levels shall be those specified on the approved design plans or to a 2 to 2.5% slope. New areas shall be neatly contoured into adjoining grassed areas. The top 25mm of topsoil shall have a loose tilth. No soil shall be cultivated or handled when the moisture content is at a level where soil structure damage will result.

Definitions in this section

Approved design

Approved drawings





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