Transformation of Urban Waterfronts: Using Case Studies to Explore How Waterfronts can be regenerated into assets
Summary of main points:
- Case studies discussed; Darling Harbour (Sydney), Royal Docks (London)
- Both ports were major hubs of trade during the operation with industrial activity situated throughout the ports.
- Both sites had a legacy of unknown contamination.
- Key takeaways from the remediation of the sites was to understand the site history, manage the uncertainty of contamination and what that might mean for planning works on the contaminated site and data management for future works. Remediation may span a generation of engineers so keeping data records is important
- New infrastructure projects and public perception of the land were key for the rejuvenation of the Royal docks
Containment of K20 Contaminated Site Through a Multifunctional Active Cover lining
Summary of main points:
- The K20 landfill serviced as an all-purpose landfill with hazardous waste such as “blue chalk”, ash and slag, chlorinated hydrocarbons and various volatile and non-volatile hazardous wastes being disposed to the landfill. Record regulations were not introduced by the EU until after the closure of the landfill.
- Decision to undertake thermal destruction of the soil was attempted at a nearby cement kiln, however during operations hexachlorobenzene was detected in animal species surrounding the cement kiln. As a result those animals had to be culled with nearby populous evacuated.
- A containment approach was applied to the site using a special liner and sealed in 1981. Cut off walls were also applied
Soil Bentonite Slurry Walls, A recent Experience & Performance Within an Arsenic Containing Site
Summary of main points:
- It is important to identify right geotechnical and permeability blend for cut off walls.
- Investigations, particularly movement of groundwater need to be investigated prior to use of cutoff walls to determine proper depth required. In the case of the case study presented 12m cut off walls were created
The Use of Natural Source Zone Depletion (NSZD) as a Valid Approach to Achieve Closure of Active LNAPL Recovery Systems
Summary of main points:
- In the case study a diesel spill moving towards a nearby river was discovered and AECOM investigated. Original approach was an active remediation approach with skimmers and Fans and CO2 extraction,
- During secondary investigations it was discovered that Natural Zone Depletion accounted for the majority of the remediation, thus active remediation was switched off with remaining product taken care of with phenomenon occurring in NSZD saving money.
- Key take away was accepting that the LNAPL thickness “will be around for a while”
Challenge & Solutions for the Management and Development of Legacy Landfills – Perspectives from Across the Ditch
Summary of main points:
- Groundwater and landfill gas are complex within landfills and this present a large challenge in redeveloping landfill sites and should be considered in a CSM in a site
- A development program should consider when planning approvals should occur
- It is our duty as professionals to seek the best outcome for the community and the developer where there is an intention for development on closed landfill sites
What Lies Beneath? High Resolution Site Characterisation Tools Used to Develop LNAPL Conceptual Site Models
- Light fluorescence is able to give real-time data for the development of a robust LC
- Site history are records of contamination are crucial for both site investigations as well as development.
- The intention for active remediation is good, however practicality and risk also need to be balanced. In certain situations, containment and passive remediation may be better alternatives. All comes down to risk + Stakeholders.
2019 EcoForum Conference report submitted by Xiao Jin (Tonkin + Taylor). Session Chair: Lean Phuah (Tonkin + Taylor)
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