BROOKTON HIGHWAY UPGRADE 2008-11
6. Project Monitoring
monitoring frequency &
8. Species list for
area of direct seeding
2. PROJECT STAKEHOLDERS
3. SUMMARY OF REHABILITATION
4. EXISTING ENVIRONMENT: SPECIES COMPOSITION
5. DETAILED METHODOLOGY
6. PROJECT MONITORING
MINIMISING DAMAGE DURING AND AFTER CONSTRUCTION.
SPECIES LIST FOR REHABILITATION WORKS.
MAIN ROADS Western Australia
Project Rehabilitation Plan
Main Roads’ Wheatbelt South division have been progressively re-constructing various
236.28slk has been identified for reconstruction and re-alignment due to an existing single
lane seal, substandard line of sight and curve alignments.
The planned construction requires the clearing of native vegetation. In order to offset the
vegetation removed, Main Roads will rehabilitate acquired lands, old road alignments and
other areas cleared so that after construction, the net vegetated area will be greater than
Within and adjoining the project area, to the East, a revegetated corridor exists. The area
comprises approximately 4.8 ha, which was planted in 1992 by Main Roads, a joint initiative
by Main Roads, adjoining landowners and local environmental people.
This document details the rehabilitation methods of an additional 2.5ha proposed to be
Relevant stakeholders include Main Roads Western Australia (MRWA), project neighbours
and landowners, the Kondinin Shire Council, the Department of Environment and
Conservation [DEC], Representative of the Wildflower Society, The Conservation Council of
W.A., The Roadside Conservation Committee and other interested groups.
the project area and along with another local species Xylomelum angustifolium,[ sandplain
woody pear] will be planted extensively within newly acquired lands of the project.
Photo taken of onsite remnant
All acquired farmland, closed road surfaces, all areas within the project definition that have
had any native vegetation cleared, construction hardstand areas and access tracks.
Controlling weeds prior and post rehabilitation using selected herbicides.
Ripping,cultivating of hardstand banks, access tracks and existing sealed road surfaces.
Tyne cultivating and rotary hoeing of old sealed surfaces.
Planting of native species in seedling form and direct seeding.
Spreading of mulched native [cleared] vegetative material.
Revegetation performance will be monitored and infill planted in 2012 if needed.
Managing weed infested topsoil
Works would be undertaken between the months of May 2011 through to July 2011, weather
permitting. Weather being a critical factor – dry conditions will delay commencement date,
and an extremely dry or wet season will affect germination. The success rate of plant
species will largely be determined by weather conditions.
ANTICIPATED PROJECT OUTCOMES.
In total, approximately 7.6ha Ha of land will be rehabilitated by the end of this project,
offsetting the 1.5 Ha of native vegetation which will be cleared for construction. Success of
the rehabilitation would realise new vegetated corridors as near as or equivalent to the
original bushland. These corridors will connect other remnant bushland areas, forming
habitat, nesting sites and safe passage for locally migrating fauna species, and the
MAIN ROADS Western Australia
a lesser factor than above will be of some benefit to tourism and general road users. It is
expected that the corridors will mature and become semi sustainable within 10 – 25 years.
Local endemic species to be planted Xylomelum angustifolium [Sandplain Woody Pear]
Photo taken of onsite remnant
A site visit was carried out by environment officer Peter Denton in February 2010 to examine
the existing vegetation. The following species were identified for use in the revegetation
process, although some of the species are difficult to propagate and not readily available as
growing plants. In this scenario reliance will be placed on natural regeneration.
underlined with some degraded forms of atriplex and maeriana species. Some of these
existing trees will form part of the new corridor.
The following species were identified within the project area; Eucalyptus salmonophloia,
The acquired farmland area has been developed for more than 80 years. The soil is slightly
road reserve is dominated by feral weeds including wild oats, various brome grass species,
wild radish, veldt grass and barley grass.
Later in this document, the methodology is outlined to address these weed species before,
during and after the revegetation process.
Billardiera [marianthus] bicolour
before clearing takes place.
9. Saline areas will be planted with local salt tolerant species.
All rehabilitated and revegetated sites will be monitored quarterly for a period of three years
after planting by:
a) photographic detail of individual sites
b) on ground species identification, specifically for new germinants
c) weed cover and management if >35% cover, seasonally for three years
record rainfall / temperature during growing season.
drying seasons and climate change] rainfall has been a critical factor in determining the performance of
seedlings. Over the past 5 years rainfall generally in the region has diminished by up to 25%. Change of
climate will determine what species will be planted in the future and when they will be planted
e) infill planting of failed areas (<70%) commencing in the 2011-12 season by way of
Main Roads’ annual Regional Revegetation Planning Scheme
f) maintaining and updating records
Where the re-alignment traverses existing fragile bushland areas, clearing will be kept to a
minimum; and wherever possible only one side of the road reserve will be cleared.
No Clearing is to take place outside of the project area.
No clearing shall take place outside of the clearing line; [tagged trees shall remain in
All machinery movements are to be strictly confined to and within the tagged clearing zone.
General Hygiene All servicing of machinery is to be carried out in one location only
(preferably off site). Oil filters, mechanical parts and other disposable items are to be
transferred to an approved refuse site, and not left on site. Any chemicals that are to be used
on site must be accompanied by the relevant MSD sheets [Material Safety Data] and made
readily available to all employees, visitors and contractors working on the site.
All care is to be taken not to spill fuels, chemicals, oils and greases at the worksite.All other
refuse created during construction is to be taken to an approved refuse site.
Machinery travelling from outside of worksite to the worksite must be weed seed free.
All soil debris must be washed off prior to entering worksite.
Machinery and other work vehicles must have tyres checked for calthrop and double gee
before entering worksite. Special care is to be taken.
Since the project site receives less than 400 mm average annual rainfall, dieback
(phytophthora cimmamomi) is not considered to be an issue, and does not warrant a dieback
survey to be carried out.
Movement of all spoil material is to be confined to the immediate construction /project area.
All topsoil within the construction/project area has been deemed weed infested and is not to
be reused as topsoil for rehabilitation.
All topsoil (weed-infested) is to be carted to landholders’ borrow pit and buried
Any other weed free sub base gravels and soils as assessed by the Environment
Sandy Gravel rises [eastern end of project area]
Acquired Farmland areas [Lower landscape/ clay flats]
Eremophila decipiens [Cuttings]
Sandy gravel rises (eastern end of project area)
Direct seeding plus