THE CHALLENGE:
Remediation works required to address hydrocarbon impacts associated with the former motor garage were designed following discussion with London Borough of Redbridge. Due to the need for excavation of basement / undercroft parking areas below the 3nr proposed apartment blocks, the remediation works were carried out in conjunction with sheet piling and bulk excavation/disposal. Key challenges were design & implementation of sheet piling directly adjacent to Network Rail Land and need for a sustainable materials-management based excavation with tight logistical constraints.
OUR SOLUTION:
Soilfix designed and implemented remediation & enabling works to the satisfaction of the Local Authority & Network Rail, including :
- Decommissioning & removal of underground storage tanks & interceptors;
- Targeted remediation of gross contaminated hotspots including hydrocarbons & asbestos cement sheeting materials;
- Breakout of slabs & sub-structures, processing to a suitable grading for re-use;
- Permanent sheet piled retaining walls to 3nr blocks & concrete capping beam construction;
- Excavation and disposal of 15,000 tonnes soil from 3nr proposed basement areas, segregating materials of differing waste classifications;
- Dewatering & treatment to facilitate basement construction works;
- Construction of hybrid working platforms (cement stabilised soil capped with crushed running layers on Tensar Geogrid) for ongoing piling operations; and,
- Attendance of piling operations including disposal of pile arisings off-site.
Soillfix successfully completed all works to the client’s overall construction programme in spite of delays experienced in securing BAPA licence approvals from Network Rail for construction of 2nr separate sheet piled wall sections directly adjacent to the railway.
