Appendix CRF - Part 3 - Northamptonshire County Council

Radiological Assessment 0820-2
Version 2
Cell
Basal area
(m 2 )
Surface area
(m 2 )
Void volume
(m 3 )
1A 12,866 15,195 268,072
Western
extension
2,000 2,396 13,080
1B 11,934 11,934 193,865
2A 12,449 12,449 187,900
2B 10,464 11,822 143,010
3A 8,412 13,922 160,877
3B 9,090 11,624 174,685
4A 11,144 14,097 174,564
4B 12,552 12,552 206,102
5A 6,929 11,669 144,211
5B 8,294 9,887 147,221
Table 2.1 Cell areas and volumes at the ENRMF landfill site.
Cell construction comprises:
Leachate drainage layer. This varies between cells, but in Cells 3, 4 and 5 it
will be 500 mm of crushed granite.
Artificial sealing liner. All cells include a 2 mm thick high density
polyethylene (HDPE) geomembrane.
Artificial mineral layer. All cells (except the western extension and Cell 2b)
include at least 1.5m thickness of artificially emplaced geological barrier
(Upper Lias clay sourced from the Slipe Clay Pit). This clay will be placed
with a maximum design permeability of 3x10 -10 m/s and thickness of 1.5m or
equivalent to meet the Environmental Permit requirement for permeability of
less than or equal to 1.0 x l0 -9 m/s with a thickness of more than or equal to
5m.
The geological barrier also includes between 3 and 8 m of natural geological barrier
(unsaturated zone) above the water table.
Waste is examined on receipt at the site and after checking for compliance with the
waste acceptance criteria is deposited within the current filling area. Temporary haul
roads are formed within the fill area ensuring the de1ivery trucks do not traffic,
unnecessarily, on the waste surface.
Galson Sciences Limited 5 14 July 2009
WS010001/ENRMF/CONSAPPCRF 555