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Soils Washing

Case Study - Soils Washing Olympic Park  - London 2012 Games

Contract In Brief:  
Location: Contract: Client:
London 2012 Games - Olympic Park

Ex-situ Contaminated Soils Treatment

Olympic Delivery Authority
HBR Role: Managing Consultant: Contract Period:
Main Contractor using
CampbellReith as design team

Tier II Specialist Remediation Contractor

CLM 78 weeks
Contract Value: Contract Start:
£5.35M July 2007
HBR Site Management    
Contracts Manager: Project Manager: Site Manager:


 

Project Background:

In the summer of 2007 HBR were awarded Tier II specialist remediation contractor status to install and operate 2 Soils Washing plants at the North Site Treatment Centre (NSTC) established by Morrison Construction.

The layouts of both plants were re-designed to make use of existing hardstanding areas at a former storage depot that was located within a “construction island”.

With a key focus on materials sustainability the design team created dozens of “discrete” sites within the Olympic Park boundary, each with its own set of site specific acceptance criteria to maximise re-use of site won and processed tonnages.

In this way the project was a fine example of a hub-site/cluster model approach.

HBR project staff played a key role in this process by reviewing site investigation and stockpile data of soils and sludges requiring treatment. Once they had verified that the soils could be suitably cleaned using soils washing techniques to meet the desired re-use criteria the soils were brought into the NSTC and stockpiled.

“Ownership” of materials then transferred to HBR who allocated an individual identifier code, and tracked the materials from point of re-excavation, through processing and recovery steps. This information was updated daily, giving the wider design team a continuous picture of material types and volumes validated for re-use.

This collaborative approach allowed resources to be programmed and linked efficiently through to the earthworks contractors.

Operation Phase:

A key challenge of working on the Park, with its associated historical complexity and numerous concurrent operations, was reacting to changes in incoming material and contaminant types as well as volume surges. Additional resources were mobilised to run one of the plants on a double shift basis thereby increasing production to satisfy one of the key performance indicators.

The washing plants were fitted with logwashers, attrition scrubbers, density medium separators, hydrocyclones, drum magnets and fines recovery systems to extract and remove heavy metals (As, Pb, Cu) and hydrocarbons (Benzo(a)pyrene, TPH) from the feedstock. Organic matter (rootlets and detritus) was recovered on each plant at 3 separate intervals and materials used within top-soiling operations.

 soilswashingolympic.jpg

                 Chemical v Physical v Biologicalv Complex Sorting v Water Treatmentsv Complimentary Processes

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