Historical Projects
Butler Revegetation
 

Client: Public Transit Authority

Project Period: 2013-2015

GHEMS Revegetation Environmental was contracted by the Public Transport Authority back in 2013 to implement the revegetation plan for the Butler Railway Extension Project.

 

GHEMS had been contracted out to do all aspects of revegetation starting from initial ripping, to sourcing and spreading of mulch & topsoil and the application of wood fibre hydromulch. Over 43,000 tubestock and 10kg of native seed was distributed throughout 6km of rail at the completion of the project.

 

With many of the areas having already been fenced off and between PSP’s, rail, road and bridges logistics was always going to be a difficult component of this project. But with GHEMS’ experienced team of key field supervisors and machine operators, many of these issues were problem solved out in the field and also at a desktop level. ​​​​​​​​​​

 

Nearly two years on there is an extremely successful revegetation taking shape throughout the alignment. Ongoing weed maintenance and infill planting throughout the previous two years has allowed the revegetation areas to exceed expectations.

Cardup Landfill Revegetation
 

Client: Western Australian Landfill Services (WALS)

Project Period: 2012-2014

 

GHEMS begun work on the first steps towards revegetating the South Cardup (Byford) landfill site in 2012.  It’s perhaps difficult to imagine, but the South Cardup landfill site was home to the Priority 3 Acacia horridula and possibly a Thelymitra genre orchid listed as Threatened Flora (Declared Rare Flora).  Vegetation communities at the location included Eucalyptus wandoo and Marri woodland, as well as Forrestfield Complex heathland.

 

GHEMS' Role:

  • Undertaking annual environmental assessments of a small stream that ran around the South Cardup site

  • Bi-annual assessments of areas containing natural bushland within the site.

  • Revegetation of the entire landfill site in stages associated with the closure and capping of individual cells.

  • Selection of native plants for the revegetation process

  • Approximately 1,000 trees and 24,000 tubestock plants were planted  and are surviving well.

  • Maintenance, follow up monitoring and weed control.

Collie Foreshore Revegetation
 

Client: Shire of Collie

Project Period: 2010-2012

 

The Shire of Collie awarded a tender GHEMS to conduct weed spraying, tree removal and native species replanting works on a stretch of the Collie River near to the Coombe St Bridge in the Collie townsite over three years.

 

GHEMS' Role:

  • Intensive weed eradication, as the site was heavily infested by a virtual smorgasbord of weeds that included Watsonia spp, Kikuyu and a range of woody species such as Acacia decurrens, A. dealbata and A. baileyana, and Pinus pinaster.  The larger trees in particular required extensive work to remove, as some were up to 10m in height and firmly established at the location.

  • Revegetation works with tubestock, using a native species list that was drawn up in liason with the Shire of Collie. 

  • On-going weed control operations were needed to assist with the overall transformation of the site.

 

On completing the project in late 2012, GHEMS’ operations manager, Brayden Hill, said,“The GHEMS team have produced a particularly satisfying result down here in Collie. This site required extensive work to initially clear and weed management was a critical issue throughout the project, but we’ve established an excellent example of native south west riverine vegetation that is actually quite difficult to find in as good a condition as this.” ​

Mount Gibson Gold Mine Revegetation Monitoring
 

Client: Mount Gibson Gold Project

Project Period: 2006-2013

 

GHEMS has a long history of involvement with the Mount Gibson Gold project site.  In 1910 gold was first found at Mount Gibson, and open pit and underground mining comprising of 215 km2 of exploration and mining tenements commenced in 1988.  More than twelve million tonnes of ore was processed between 1988 and 1998 when the mine ceased operations.

 

Since then, the mine site was predominantly on a care and maintenance schedule as the property passed through several owners, including Legend Mining with whom GHEMS began working with in 2006.  GHEMS also worked alongside Extension Hill Pty ltd who took over the site in 2012.

 

GHEMS has been collaborating with and providing expert advice to this project for nearly a decade, and upon completion of monitoring in 2013 it was shown that vegetation at the Mount Gibson Gold project site was continuing to improve and at many locations, the native vegetation structures were fully self sustaining.

 

The Mount Gibson Gold Project was a long term endeavour for GHEMS, but one which proved GHEMS' capacity to plan and implement revegetation works on not only a large scale area, but in difficult physical and climatic terrain. ​​​​​​​​​​

 

GHEMS' Role:

  • Providing expert consultant advice on revegetation management

  • Conducting monitoring on established transects on a variety of waste dumps, tailings dams and other decommissioned sites

  • Revegetation and rehabilitation works

  • Earth works to facilitate revegetation and to control erosion

  • Collection, treatment and dispersal of native seed.

Roe Highway Revegetation
 

Client: Western Power

Project Period: 2008-2012

 

In 2008 Western Power contracted GHEMS to implement revegetation, maintenance and monitoring on the median strips and southern verge areas of Roe Highway between Kenwick Link and South Street (Roe 4, 5 & 6).  The areas of interest were degraded following the installation of High Voltage powerlines, with fourteen specific sites replanted in 2009. 

 

The works have now been officially approved and the project signed off, and GHEMS’s Managing Director, Greg Hill, said “the success of the project was a credit to the professional standards, hard work and dedication exhibited by all of the staff involved in achieving this successful hand over.” ​​​​​​​​​​

 

GHEMS' Role:

  • Planning and Management of revegetation works

  • Direct seeding

  • Planting tubestock

  • Remedial works and planting

  • Weed control for entire course of project

  • Formal monitoring against set completion criteria.

  • on-going weed control program over the course of the project

Geraldton Southern Transport Corridor Stages 1 and 2
 

Client: Thiess / ABI Group

Project Period: 2005 -2010

 

GHEMS staff set up an office in Geraldton during the construction phase and employed a number of local personnel and utility owners to supplement our team of field staff, project managers and supervisors.  A team of GHEMS technicians were mobilised to site from Perth.  Many of the sites had embankments of 33% gradient and several environmentally sensitive sites required specific management. 

 

The Revegetation has been effective with stage 1 meeting completion criteria and being handed over in 2009.  GHEMS experience with mulching, topsoil application, trimming and surface tracking and the selection of suitable plant species were all key to the successful vegetation establishment in the drought conditions that prevailed during establishment.

 

GHEMS' Role:

  • Incorporation of soft landscaping and revegetation along the road and rail corridor

  • Development of revegetation management plans

  • Site preparation

  • Mechanical mulching and final surface trimming and tracking

  • Local provenance seed collection and supply

  • Direct seeding

  • Tubestock supply and plant

  • Weed management

  • Irrigation installation

  • Maintenance, erosion and remedial earthworks

  • Monitoring and Reporting (species diversity, species density, condition and weed cover)​​​​​​​

Telfer Gas Pipeline
 

Client: Gas Net / APA 

Project Period: 2006 -2008

 

This site was monitored in 2007 and a maintenance program for the following two seasons was developed and implemented GHEMS.  Monitoring in 2008 indicated that remedial treatments were very successful, with dune stabilisation evident and re-colonisation occurring.

 

GHEMS experience working in arid areas was a key to this project with logistics, timing and being self-sufficient in a remote location of great importance to the success of the project.  GHEMS previous flora survey and seed collection experience with mine sites in the Pilbara and Goldfields contributed to this knowledge.

 

GHEMS' Role:

  • Initial site visit by GHEMS managers to assess the area and report on its requirements in terms of current vegetation condition, resources and treatment methods.

  • Development of revegetation plans.

  • Identify and source the right quantity of suitable, local provenance seed

  • Installation of jute netting and brush application to dunes

  • Dozer scalloping to roughen soil surface, break compaction and create germination niches.  Dozer scalloping is a technique that traps storm water run-off and wind-borne seed, also providing protection for young germinates from wind to increase germination success and seedling survival. 

  • Direct seeding into bare areas.

  • Bunding and diversion of surface water to prevent pooling.

  • Swampy tracking and blading to crimp wattles and improve line of sight.

  • Development of maintenance program and monitoring criteria.

Southern Suburbs Railway
 

Client: Rail-link Joint Venture

Project Period: 2004 -2010

 

Using GHEMS experience in the revegetation industry, advice was provided to the client on all aspects of the rehabilitation works.  The project was managed safely in close proximity to the railway line, with the safety of our staff and the OHS aspects a successful outcome of the work.  The project's size and logistics required timely and efficient project management, planning and scheduling.  The revegetation has been effective with all sites handed over in December 2010.

 

GHEMS' Role:

  • Project management incorporated the planning and implementation of revegetation works on a consultant and operational level, including:

  • Development of revegetation management plans

  • Mechanical surface mulching and tracking

  • Native seed recovery and supply

  • Tube-stock supply and plant

  • Grass Tree and Zamia Palm recovery and transplanting.  The project involved the largest Zamia Palm and Grass Tree recovery, nursery holding and transplantation operation of its kind with an extremely successful survival rate of approximately 95%

  • Environmental weed management

  • Monitoring, maintenance and reporting over a four year period

Pinjar to Eneabba Transmission Line
 

Client: Western Power

Project Period: 2015-2017

Western Power have completed the removal of a 132kV wood pole line and replaced it with a 330kV lattice steel tower/pole line between Pinjar and Eneabba substations.  The transmission line is approximately 190 kilometers (km) in length and traverses a number of State and privately owned properties including a number of nature reserves.  

 

GHEMS worked with Western Power to implement the Rehabilitation Management Plan for this project to ensure the project area will be a safe and stable land form with topography and hydrology consistent with surrounding land.  The project aims were to create a rehabilitated ecosystem that is characteristic of surrounding vegetation with equivalent flora and fauna habitat values, and ecosystem functions and resilience.  

 

GHEMS implemented and managed an ongoing weed management plan to minimize displacement of native species and encourage recruitment. The plan was inclusive of herbicide in individual spray packs, spray units, wick wiping, cut and paint in addition to brush cutting and hand-weeding. The method was based on site-specific requirements resulting in an optimal outcome. Collection of provenance seed was conducted over the 2015/16 summer months for use later in the project.  Monitoring reports showed the success of the rehabilitation.

GHEMS Revegetation Environmental  |  Email: enviro@ghems.com.au  |  Phone: 08 9373 7100

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