Merrion Way, Leeds
Tel: 01423 276000 Email
Unite Group plc
- Phase I Desk Study
- Phase II Ground Investigations
- Coal Mining Risk Assessment
- Foundation Recommendations
- Waste Classification
- Contamination Assessment & Revised Risk Assessment
Geotechical and geoenvironmental investigations
CGL was commissioned by Structural Engineers Walsh to undertake a Phase I Desk Study and subsequent Phase II intrusive investigation at this proposed development in Leeds.
The proposed development will require the demolition of an existing buildings and the re-provision of a basement car park to provide student accommodation. It will consist of a basement car park and two towers of 15 storeys and 27 storeys linked at first floor level with associated landscaping and new public open space and servicing area. The site is set within a former industrial area, previously used as an engineer’s yard, an engraving works and more recently housed Elmwood Mills. CGL reviewed the geoenvironmental and geological setting of the site in the context of these historical land uses and the development proposals.
CGL carried out intrusive investigations to confirm the ground conditions identified within the Desk Study. Investigations determined the depth and condition of the Better Bed Coal Seam and surrounding bedrock; the presence of foundations and ground conditions underlying the existing building footprint and identified any potential risks from contamination and ground gas.
The intrusive investigation comprised two external combined percussive/rotary boreholes, including rotary coring, to a maximum depth of 20mbgl with rotary open-hole concrete core holes within the existing building footprint.
CGL’s investigations provided the client with geotechnical design parameters and confirmed that risk to the development from shallow coal mining, contaminated soils and ground gas was low.
From this CGL were able to recommend foundation options that ranged from pad foundations to short rock socketed piles, matched to the ground conditions, for a cost effective solution for the client. In addition, CGL were able to provide geoenvironmental recommendations to address the historical usage of the site and the proposed development levels.