07/0604 - Approved Plans [As Published] · 142007.604

1.12.2 CONTAMINATION

 

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

1.12.3 FINISHING

 

Feather edges into adjoining undisturbed ground.

1.12.4 CONSOLIDATION

 

Avoid differential subsidence and excess compaction and produce a finished topsoil
surface that has the following characteristics:

= Finished to design levels.
« Smooth and free from stones or lumps of soil.
* Graded to drain freely, without ponding, to catchment points.

1.12.6 TOPSOIL DEPTHS

 

Spread approved topsoil to turf areas to a depth of 150mm. Spread approved topsoil to
planting areas to a depth of 300mm.

 

 

 

 

Turf species shall be ‘Sir Walter Buffalo’ Grade A. The turf shall have 90-95% of the
species type specified. The remaining percentage may contain grass species other than
the specified type. Minimum thickness of topsoil attached is to be 25 mm.

Within 14 days of signing of the contract, nominate the specialist supplier of turf for the
project for approval. Furnish a warranty from the supplier that the turf is free from weeds
and other foreign matters. Random inspections of 1 m? of specified turf shall be required
before laying of turf on request of Superintendent. If the sample upon inspection is found
to be defective, the entire turf supply shall be rejected. Alternatively, the entire turf
supply shall be treated with selective herbicides at no cost to the Principal.

Upon placement of topsoil bring surface to smooth even grades, free from mounds and
hollows such that the whole surface drains in accordance with the finished design levels.

Deliver turf to the site within 24 hours of cutting and prevent it from drying out between
cutting and laying. If possible lay turf within 36 hours of cutting. If it is not laid within 36
hours, roll it out on a flat surface with the grass up and water as nécessary to maintain a
good condition.

Lay the turf along land contours with staggered, close-butted joints, and so that the
finished turf surface is at the levels shown on drawings. Along all edges and kerbs lay 2