In June 2009, Tier was commissioned by Argent Group Plc to undertake a Phase I Preliminary Risk Assessment of land formerly occupied by Elisabeth House, Manchester which was built in 1960 and had weathered badly. The purpose of the investigation was to produce a preliminary conceptual site model and generic risk assessment as an accompaniment to the planning application at the site. The study of historical maps showed the Site to have had a light commercial development history since at least; however, the site was redeveloped in the 1970s as the Elisabeth House Building.
Following planning permission, Tier undertook a preliminary contaminated land and geotechnical assessment of the site, whilst the Elizabeth House building was in situ. This investigation recorded a maximum thickness of 3.40m of Made Ground which comprised PFA, overlaying a 4.00m thick layer of Glacial Till. The founding bedrock was encountered at a depth of 9.00m bgl and is comprised of closely fractured extremely weak to weak Sherwood Sandstone. As the development proposals included a two storey basement, it was recommended that further cable percussive and rotary drilling was required to validate the contiguous piled basement wall design; however, due to program restrictions, this would need to be undertaken within a very small window of opportunity during the demolition of the former building.
Construction commenced in May 2012 and was completed in late 2014 to coincide with completion of the Central Library and Town Hall redevelopment. Situated in central Manchester, One St Peter’s Square was designed in a simple modern classical style with jura limestone columns to complement the Central Library opposite and provides a focal point for passers-by as part of the new civic space for St. Peter’s Square.