Viridian III Technical Specification OPW1 [As Published] · 142008.256

                                                                          VIRIDIAN III - Landscape Works




3.      BASIC EXCAVATION


3.1     EXCAVATION

3.1.1   GENERAL

Refer Civil Engineer for Bulk Earthworks and Excavation.

Do not disturb services. Locate all services before commencing any excavation and
cultivation. Refer to Civil Engineer for service locations. Excavate / cultivate areas within
500mm of services by hand.

3.1.2   SITE CLEARING

All existing vegetation indicated to be retained on drawings is to be protected from damage
including associated root systems. Adequately protect from damage all structures and
services which are beyond the limits allowed to the subcontractor.

Where concrete, diesel oil or any other material harmful to vegetation has been spilt on the
topsoil or subgrade, the affected areas shall be excavated and spoil removed from site.
Affected areas are to be reinstated to suit final requirements or as directed on site.

Remove from site all excavated material resulting from the required earthworks that cannot
be reused in the landscape works. Remove from site all vegetative spoil. Do not burn.

3.1.3   LOCALISED EXCAVATION

Inspect and carry out soil tests on all existing finished surface soils levels. Maintain and re-
structure existing site topsoil soil that is approved by soil test to 300mm. Refer to site topsoil
section of specification.

For all other areas requiring imported topsoil, excavate and dispose all surplus material to
allow for depths required for all landscape elements below:

General Planting areas: 300mm

General Turf areas: 100mm

Tree Planting: Varies for different rootball sizes. Refer planting section in this specification.

3.1.4   SUBGRADE PREPARATION

During cultivation, thoroughly mix in any materials to be incorporated into the subsoil.
Cultivate manually within 300mm of paths and structures. Remove stones exceeding 25mm,
clods of earth exceeding 50mm and any weeds, rubbish or other deleterious material
brought to the surface during cultivation.

Cultivate the subsoil to all planting and turf areas to a depth of 150mm.



3.1.5   TRIMMING OF SUBGRADE

The subgrade shall be shaped to the profile required. The surface of the subgrade shall be
compacted, trimmed, profiled and check levelled prior to placing of pavement materials.


EDAW Aust                              Page 11                         February 2008