Case Study HS2
2
Registration No. 5839536 Removal of contaminated ground high in heavy metals and offsite treatment at Dunton soil treatment hub and installation and value engineered reduced thickness piling mat Client: Willmott Dixon Site: HS2 College, Birmingham Contract Value: £950,000.00 Duration: 2 Months Technology Used: Tensar TriAx TX190 Geogrid Bioaccelerator and Regener8 Treatment Products Dunton were appointed by Willmott Dixon to remove 3,500m3 of surplus contaminated made ground to the Wolverhampton hub site to treat and reduce waste classification prior to landfill. A pile matt was designed to reduce stone import by use of a Geo-Grid membrane. DEL were also asked to pre dig the drainage channels and backfill with clean 6F2 stone so that when the groundworks placed their drainage they would not encounter any contaminated materials DEL also managed pile and ground worker arisings via stockpiles and the hub site and/or direct to landfill. Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • [email protected] ‘Dunton were very professional and helpful in the approach to the specific site constraints Nick Gibb– Preconstruction Director Case Study
Transcript of Case Study HS2
Registration No. 5839536
Removal of contaminated ground high in heavy metals and offsite treatment at Dunton
soil treatment hub and installation and value engineered reduced thickness piling mat
Client: Willmott Dixon Site: HS2 College, Birmingham Contract Value: £950,000.00 Duration: 2 Months Technology Used: Tensar TriAx TX190 Geogrid Bioaccelerator and Regener8 Treatment Products
Dunton were appointed by Willmott Dixon to remove 3,500m3 of surplus contaminated made ground to the Wolverhampton hub site to treat and reduce waste classification prior to landfill. A pile matt was designed to reduce stone import by use of a Geo-Grid membrane. DEL were also asked to pre dig the drainage channels and backfill with clean 6F2 stone so that when the groundworks placed their drainage they would not encounter any contaminated materials
DEL also managed pile and ground worker arisings via stockpiles and the hub site and/or direct to landfill.
Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • [email protected]
‘Dunton were very professional and helpful in the approach to the specific site constraints
Nick Gibb– Preconstruction Director
Case Study
Hazardous soils present on site ● The site was historically used for industrial activity dated back to 1839, predominantly metals manufacture and glass works, and due to this, there were some hazardous and Non-hazardous waste class soils which required treatment and cart away. Hazard to workers and public residents ● The project comprised of excavation of contaminated materials and placing them in temporary stockpiles prior to treatment off site, which may cause environmental impacts, (dust, noise, odour). Excess waste soils also not geotechnically suitable for construction ● The structural properties of the existing soils were not suitable for construction of the proposed HS2 college.
Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX [email protected]
Challenges
Our Solution
A CEMP
(Construction
Environmental
Management
Plan) was put in
place prior to the
commencement
of the works, where
the procedures of
monitoring dust,
noise and odour
was undertaken on
site to ensure these
pollutants were
kept under control.
Results
A value engineering
exercise resulted in
an Interlock Tensar
TriAx TX 190 geogrid
placed to provide
additional tensile
strength to the
subgrade followed
by 300mm of 6F2
placed in layers and
compacted to
minimise any
settlement during
pile installation.
100% Recycled materials
recovered
• Project was completed on time
• Project was completed on budget
Asbestos and
heavy metals
containing
material was
identified within
the stockpiles,
which were
removed off site to
the DEL treatment
hub where the
material was
treated and
disposed of as
non-hazardous to
licensed facilities
at a reduced cost.
