From late January 2018, John Holland-KBR Joint Venture (JH-KBR JV) will deliver upgrade works to the Lee Street retarding basin at Frankston, on behalf of Melbourne Water.
The upgrade works will ensure the retarding basin continues to reduce the risk of flooding to the community.
Why we are doing these works
Melbourne Water has over 200 retarding basins that we regularly assess for risks, conduct maintenance on, and upgrade as necessary. The Australian National Committee on Large Dams (ANCOLD) guidelines represents the best Australian and international engineering practice in the safe design, management and operation of dams. We use these guidelines to manage our retarding basins.
The Lee Street retarding basin has recently been assessed against the ANCOLD guidelines. This assessment has shown that upgrade works are necessary to ensure the retarding basin continues to reduce flood risk and operate safely for the community.
What’s happening and when
John Holland-KBR Joint Venture will be undertaking these works on behalf of Melbourne Water.
Works will include:
- removal of trees, root ball excavation and backfill of embankment
- partial reconstruction of existing embankment
- filter trench excavation and backfill
- filter drain outlet installation
- embankment hardening
- embankment crest capping
The project team hired a qualified wildlife handler, with 25 years’ experience in zoology and ecology, as a precaution and to put community concerns at ease.
They have a permit under the Wildlife Act 1975 and we are operating under this Act.
The wildlife handler will remain onsite for the duration of the tree removal works.
What has been completed to date
- A Flora and Fauna assessment was completed in the design phase
- A wildlife pre clearance check was completed prior to construction, including checking the site for fauna and marking trees likely to have habitat.
- The wildlife handler and a second wildlife handler completed a walk through on the day of the tree removal and again checked all hollows to ensure no wildlife had moved in, including checking higher location via a boom (cherry picker).
- If fauna is found in the tree, the wildlife handler will attempt to catch it (without chasing or causing it distress). If it can’t be caught the wildlife handler will encourage the fauna to move. If this isn’t possible the contractors will move to the next tree and return to try again.
- To check for micro bats, the wildlife handlers have been lifting the bark and checking in hollows and cracks. If any micro bats are found they are bagged, put in a dark, quiet, cool area and released at dusk, preferably on a mirror image tree.
- A number of nest boxes have been purchased to install on this site as they create more habitat.
- Nests in trees that are being removed are being relocated. If they are intact, they’re being put next to the nest box and if not, the remnants are strategically placed in the nest boxes in trees to encourage the fauna into other trees.
- Hollow trees are being retained for fauna habitat and moved down to the grassy area in the middle of the site.
- A fauna ladder is being installed for connectivity for arboreal species.
- Flowering eucalyptus tree branches are being retained as a food source for birds and some mammals (and being donated to wildlife carers/shelters).
- Seeds are being collected from Eucalypt and Melaleuca trees and being extracted, cleaned and processed to use for propagation for the local area. They will be donated to Frankston City Council’s indigenous nursery.
Timing of works
Works will start in late January 2018 and take approximately five months to complete (weather permitting).
Construction hours will be:
- Monday to Friday 7am - 6pm
- Saturdays 7am - 1pm in accordance with EPA regulations
Revegetation works including the planting of over 500 trees and shrubs, the installation of a fauna ladder and further nest boxes will occur in August and September 2018.
What to expect during construction
We will do everything possible to minimise disruption during construction, however it is likely that nearby residents will notice:
- large trucks and machinery working around the retarding basin
- worker amenities set up within the construction area
- some noise, dust and vibration from construction works
- construction traffic and equipment will enter and exit the site via the carpark on Lee Street
There will be no impact to the sporting ovals during construction. All sports will continue as planned.
There may be some reduction in car spaces.
There will be pedestrian detours during the upgrade of the concrete pathway.[LM1]
Have questions? Visit our Community Pop Up sessions in January.
The project team will be at the Lee Street retarding basin to answer your questions:
- Thursday 18 January 10am -11am
- Saturday 20 January 12pm - 1pm
- Monday 22 January 5pm - 6pm