Extent of Work
The work included in this contract is as follows:-
Revegetation of Roadside Batters on slopes generally less that 3:1
Contractors Qualification
Each tenderer shall submit documentary evidence of his proven ability to carry out this type of work. Such evidence shall include a list of similar projects satisfactorily completed together with a statement of the qualifications and/or experience of the personnel to be employed on the works.
Site Preparation
It is recommended that whenever possible, areas to be seeded should be topsoiled. Prior to topsoiling, the area should be ripped (up to 200mm deep). If topsoiling is impracticable, the area should be ripped using a suitable machine or a chain designed for this purpose.
Wherever possible the area should be free of weed growth large stones or other debris.
Application Rates
The required areas shall be treated by the Contractor with the following:
a. Certified Grass Seed
Minimum 60kg per hectare. The seed mix will vary according to the season, soil condition and client requirement.
b. Fertiliser
200kg - 500 kg per hectare. Selection will depend on soil analysis results and client requirements.
c. Wood Fibre Mulch (Dyed green)
2 - 2.5 tonnes per hectare.
d. Binder
Envirotack at 40kg 60 kg per hectare or Polymer binder maximum 250 litres per hectare
Note: The seed and fertiliser rates are a representative sample only of the quantities that should be applied per hectare.
Operation
Seed, fertiliser, wood fibre mulch, water and binder shall be thoroughly mixed together with water to provide a slurry and then applied under pressure onto the area to be treated by means of hydromulching equipment specifically designed for this purpose and by operators trained in the use of this equipment.
After Care Maintenance
Where possible, adequate water should be applied to ensure a continuous and healthy growth of grass. A great deal will depend upon natural rainfall, but as a general guide, 25mm of water should be applied to all seeded areas weekly. It is important that the wood fibre mulch be kept moist until germination occurs. After that, sufficient watering must be kept up until a healthy sward of grass is achieved.
