AEY were contracted to undertake the demolition, clearance, and remediation works to the former colliery site followed by construction of the infrastructure works.

• We demolished/crushed/removed 91nr existing buried colliery building RC foundations (55,000m3).
• We permanently filled and capped the two original mine shafts.
• We organised and delivered the demolition of 2nr existing bridges and abutments
• Remediation of unsuitable earthworks materials
• Bulking the earthworks was one of our main deliveries so we cut/filled across the site (approximately 297,000m3).
• We constructed S278 site access and S38 internal estate roads (c1200m of full carriageway construction and associated footways, cycleways, signage etc).
• Installation of foul water drainage system
• 47nr foul MHs 1200 diameter up to 4.2m deep
• c2400m of foul drainage 150 & 225 diameter
• Installation of stormwater drainage system
• 52nr MHs 1200-1880 diameter up to 3.5m deep
• c2000m of stormwater drainage 225 to 900 diameter plus 3nr attenuation ponds
• We diverted overhead HV cables
• Coordination of installation of mains utilities
• We constructed numerous RC retaining walls and a 2400x3600mm PCC Box culvert as a footway, cycleway underpass, and landscaping for the entire 750,000m2 site.

In collaboration with our specialist earthworks partner, we established an on-site crushing and screening plant to process all of the material recovered from the buried foundation. This was then crushed and screened to produce 6F2 for use as capping material across the site. The crushing plant was also used to produce structural fill to support embankment drainage around the site perimeter.

We undertook extensive testing of highly viscous on-site material to demonstrate its suitability for re-use within the permanent as a pond liner within the attenuation ponds. The original proposal at design stage had been to dispose of this material off-site and import virgin material in its place.

- Material deliveries were managed well in a “just in time” procedure, due to limited storage space on site.
- The project was completed ahead of time due to our efficient time management and delivery plan.
- Through our stakeholder engagement plan we were able to carry out the work in an appeasing manner to not harm the client's reputation.