Viridian III Technical Specification OPW1 [As Published] · 142008.256

                                                                        VIRIDIAN III - Landscape Works
Topsoil mix Type “A” - Imported Topsoil ‘Sandy Loam’
Topsoil mix Type “B” - Imported Topsoil – ‘Sand’ to USGA requirements.

12.5.1 TOPSOIL APPLICATION SCHEDULE

Location                             Type                Depth (mm)
Mass Planting                        Type A              300 unless noted otherwise
Native grass sprigging areas         Type A              50mm unless noted otherwise
Turf                                 Type B              100mm




12.6   PLACING TOPSOIL

General: Spread the topsoil on the prepared subsoil and grade evenly, making the
necessary allowances to ensure that finished levels and contours may be achieved after
light compaction.

Where topsoil is installed by pump, ensure that temperature of soil as cooled as required
before planting is installed. All topsoil should be pumped in accordance with Australian
Standards. Do not plant into soil that does not meet relevant standards for planting as
outlined in this specification.

12.6.1 CONTAMINATION
Where diesel oil, cement or other phytotoxic material has been spilt on the subsoil or topsoil,
excavate the contaminated soil, dispose of it off the site, and replace it with imported topsoil
to restore design levels.

12.6.2 FINISHING
Feather edges into adjoining undisturbed ground.

12.6.3 CONSOLIDATION
Compact lightly and uniformly in 150 mm layers. Avoid differential subsidence and excess
compaction and produce a finished topsoil surface that has the following characteristics:
          ƒ Finished to design levels.
          ƒ Smooth and free from stones or lumps of soil.
          ƒ Graded to drain freely, without ponding, to catchment points.
          ƒ Graded evenly into adjoining ground surfaces.
          ƒ Ready for planting.

12.6.4 TOPSOIL DEPTHS
Spread imported topsoil to planting areas to depths as specified in the Topsoil Application
Schedule.

12.6.5 STORAGE OF TOPSOIL

Stockpiling on site if required should ensure that the material is not contaminated with other
surface finish materials. Ensure no air pockets are present in the soil that will assist in the
promotion of plant disease.




EDAW Aust                             Page 36                        February 2008