Astrolabe Park Stormwater Renewal

Client:   Sydney Water Corporation
Timeframe:   80 Weeks
Value:   $16m
Location:   Pagewood, New South Wales

Overview

The two existing large storm water culverts under Astrolabe Park that direct storm water into Botany wetlands were deteriorating and in need of replacement. The system is designed so the storm water outlet runs into the wetland, which acts as a natural filter.

The site was used by Botany Council as landfill in the 1960s and 70s and low levels of contaminants are present on the site, so the project provided an ideal opportunity to not only replace the storm water pipes, but to create a sustainable and more efficient storm water system through remediation and wetland works.

Enviropacific were contracted to install 650 metres of 2.1 metre twin concrete pipeline to replace the damaged culvert, reconfigure the wetland, including ground improvement works, and to remediate areas affected by construction works. Sensitive environments being protected include Bolboschoenus and Eastern Suburbs Banksia Scrub. 

Summary

  •   650m of twin 2.1m diameter concrete pipeline
  •   Seal existing culvert to prevent future leaching
  •   Construction of the Wetland
  •   Site remediation
  •   Park upgrade including walking tracks and lookout



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Major public transport insfrastructure project

Client: Managing Head Contractor
Timeframe: 18 months
Value: $23m
Location: North Western Sydney, New South Wales

Overview

Enviropacific provided full service contamination management to a major public transport infrastructure project, successfully aiding the head contractor to safely deliver the project. Enviropacific successfully remediated over 72,000 tonnes of harmful asbestos contaminated soils.

The project was completed under an expedited program to meet the infrastructure’s timely delivery. The multi-disciplinary works delivered included many of Enviropacific’s core service offerings including demolition, asbestos removal, bulk earthworks and civil, site remediation, water treatment and detailed civil construction including drainage.

The project was praised for its safe WHS delivery through effective planning and Enviropacific assisted our client in achieving project sustainability targets through innovative reuse of waste resources.

Summary

  • Remediation of more than 72,000 tonnes of asbestos contaminated soils from a former quarry.
  • On-site treatment of 12,000,000 litres of contaminated surface and groundwater.
  • Civil construction services to R.44 including 13,000 m3 Class 2 rock break and cut, importation of 12,000 m3 engineered formation, placement of 14,000 m3 site WON fills and importation of 6,000m3 clays.

 



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Point Cook RAAF Base remediation

Client: Point Cook RAAF Base Remediation
Timeframe: 2 years
Value: $30m
Location: Point Cook, Victoria

Overview

RAAF Base Williams, former Fire Training Area (FTA), Point Cook, was one of the most significant remediation projects undertaken in Victoria from both a historical and environmental perspective. Located at the longest continuously operating military airfield in the world, the base is included on the Commonwealth Heritage List.

Historical firefighting training activities had significantly tainted the underlying soil and groundwater, contaminating it with organic hydrocarbons including DNAPL, LNAPL and dissolved phase contamination.

In 2013, the Commonwealth of Australia (Department of Defence) selected Enviropacific Services as the remediation contractor for the site, which included the preparation and remediation of the site.

Between 2013 and 2015, over 70,000 tonnes of highly contaminated soils were excavated on site, treated by ex situ direct fired thermal desorption technology, and reinstated on site in validated excavation cells.

More than 15 million litres of dissolved phase contaminated groundwater was treated by a multifaceted water treatment system.

The project was delivered on time, and met all environmental and regulatory expectations.

Summary

• Excavation of more than 70,000 tonnes of chlorinated hydrocarbon contaminated soil, including DNAPL, LNAPL and dissolved phase contamination.
• Construction and commissioning of 30 tonnes per hour direct-fired thermal desorption plant.
• Thermal treatment of soil for 12 primary contaminants of interest to below USEPA regional screening levels.
• Construction of environmental enclosures to manage fugitive emissions and contaminated atmosphere, with three individual emissions control systems.
• Comprehensive occupational monitoring program including full-face respirators, summa cannisters, real-time monitoring of personal PID toxiraes, and ongoing health checks.
• Development of all work plans, procedures, monitoring and compliance reports.
• Installation of more than 1 km of sheet piles to depth of marine clay for dewatering of excavations.
• Construction and commissioning of water treatment plant to treat more than 15,000kL of dissolved phase contaminated groundwater.
• Water discharge criteria ANZECC 2000, 95% species protection criteria for a marine setting.
• Backfill and compaction of treated soil into validated excavations.
• Revegetation and demobilisation from site.



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Site water treatment and tank replacement program

Client: Viva Energy Australia
Timeframe: 3 weeks
Value: $45, 000
Location: Yatala, Queensland

Overview

Enviropacific was engaged by Viva to undertake a Tank Replacement Program (TRP) at Coles Express Yatala, QLD.

Works involved removal and replacement of the former fuel system and included excavation of 3,500 tonnes of contaminated soil, with shallow groundwater encountered.

Enviropacific were able to provide significant cost and time savings over relying on vacuum tankers by installing a portable modular dewatering and treatment system. The system removed coarse and fine sediments, and stripped hydrocarbons from the impacted water by pumping through in-series activated carbon vessels. Waters were sampled pre and post treatment to ensure contaminants were removed to below discharge criteria for storm-water.

A total of 350kL of excavation water was treated through the system during the project, with the post treatment sample results showing concentrations of contaminants of concern below the laboratory levels of reporting

Summary

• Removal and destruction of seven underground storage tanks, oil-water separator, pipe-work and fuel canopy.
• Excavation and disposal of 3,500 tonnes of hydrocarbon contaminated soil for install of 2x 90kL & 1x 110kL new underground storage tanks, SPEL Puraceptor, new fuel, LPG and pollution control pipe-work.
• Construction of a new larger fuel area canopy.
• Onsite dewatering, treatment and disposal of 350kL of hydrocarbon impacted groundwater from the site excavations being discharged to off-site storm-water.



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Remediation of drill cuttings storage dams

Client: AGL
Timeframe: 3 months
Value: $700, 000
Location: Gloucester, NSW

Overview

Enviropacific were engaged by AGL to undertake the remediation of two drill cuttings storage dams at Gloucester, NSW.

The dams had been used for the storage of drill cuttings from coal seam gas investigation wells and due to the elevated salinity and ongoing irrigation trials no water could be discharged from the dams during the cuttings removal and separation process.

Enviropacific developed a methodology whereby the drill cuttings were removed from the dam via a small dredge and pumped through six dewatering bags to capture the drill cuttings. The bags were located within an engineered and bunded storage area so that all water released from the bags was captured in a sump and pumped directly back to the dam.

Summary

• Construction of an engineered/bunded storage area for the dewatering bags
• Construction of pipework from dredge to bags and a polymer dosing system to enhance settling time
• Dredging of drill cuttings from the dams to the dewatering bags
• Capture of water from dewatering bags and recirculation back to the dams
• Classification and offsite disposal of drill cuttings to a licensed landfill.



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