|
 |
_Client:
___Cardiff County Council
_Value:___
£5.3 Million
_Duration:_
1997 - 1998
|
- The
Cardiff City Council Lamby Way Landfill Site is located on the
Severn Estuary foreshore southeast of the city.
-
It covers an overall area of 50 hectares, part of which has been
filled to capacity. " In order to increase the capacity of the
site and to meet current environmental standards, the Council
has embarked on a programme of works to cap the filled part of
the site and to open up more cells for further landfill.
-
Under the Phase I Contract, a 15 hectares area of completed landfill
was reprofiled and then capped with a 150mm protection layer of
soil, upon which were successively laid a geotextile membrane,
a 1mm thick HDPE membrane and an HDPE drainage layer. Finally,
the area was overlaid with a final capping of 800mm of sub soil.
At the same time, vertical landfill gas extraction pipes and leachate
drains and outfalls were installed.
-
Under Phase II, a separation layer was installed between the previously
filled part of the site, to which it in effect formed a capping
layer, and a new adjacent landfill cell. In addition to the layers
provided in the capping Phase I, a 750mm-clay layer reinforced
with a geogrid was incorporated in the separation layer.
-
Phase III comprises of the construction of a new cell to extend
the landfill capacity of the site. In addition to the installation
of the separation layers, which included a 500mm thick geogrid
reinforced clay layer; the work involved the excavation of 70,000m³
of material to increase the available capacity of the cell. Part
of this excavated material was used in forming the reinforced
clay layer.
|
|
|
