THE CHALLENGE:
The client was developing a site at Penarth Heights overlooking Cardiff Bay. Part of the site had been subject to extensive tipping pre-1970s. The Council Tip was on the side of the hill overlooking Cardiff Bay and was highly unstable presenting a risk of landslide to both the development and an adoptable road.
OUR SOLUTION:
Soilfix implemented a remediation scheme to stabilise the embankment which included:
- Excavation, classification and processing of landfill wastes to form consistent material streams that could be re-used within the embankment;
- Classification and processing of construction arisings to make suitable for use in embankment;
- Lime stabilisation of wet/cohesive soils to improve compaction and structure within the embankment;
- Precision excavation of detailed profiles on steep incline with restricted access including to tie in with existing re-enforced embankment;
- Construction of re-enforced embankment using multiple layers of interwoven geo-grid between layers of processed/improved and highly compacted soils;
- Placing topsoil on steep embankment stabilised with geo-mat and hydroseeded with grass;
- Construction of new footpath along length of new embankment;
- Comprehensive geotechnical verification testing and regulatory signoff; and,
- Health, Safety & Environmental controls within a potentially high risk working environment to meet Crest Nicholson’s stringent requirements.
All works were successfully completed to enable commencement of highway works on-programme with site specific geotechnical requirements met.
