Client: Environment Agency
Location: St Helens, Auckland
Contract Value: £0.06 million
Contract Period: January 2010 until April 2010
Lumsden and Carroll as the Environment Agency’s Minor Framework Contractor were awarded the contract for the removal and re-alignment of a retaining wall structure alongside an existing property in Primrose Gardens, St Helens.
The location of the existing wall caused a restriction in the flow of Tindale Beck therefore the Environment Agency deemed it a flood risk and contracted Lumsden & Carroll to remove the existing wall and replace it with a cast insitu reinforced wall. The depth of the new wall required the adjoining property to be underpinned by Lumsden & Carroll before any excavation could be made for the retaining wall.
Works involved:
- The existing wall structure was located within Tindale Beck therefore requiring consent from the Environment Agency. for working within a watercourse
- A detailed method statement in adherence to the Environment Agency’s pollution prevention guidelines was drafted and passed for construction before any work began on site
- Consultation with the local residents and the owner of the adjoining house was made at all times
- A temporary dam structure incorporating a pipe flume was erected in order to provide a dry working area for our operatives. This flume was over a 40m length and was supplemented by a hydrainer pump to cope with high flows
- Underpinning to the existing properties was done as the detailed drawing provided by the Consultant under the supervision of their resident engineer
- Retaining wall excavation within Tindale Beck and installation of reinforcement bent to schedule off site
- Installation of concrete via pump maintaining strict adherence with the Environment Agency’s Guidance for concreting near a water course
- All work undertaken using a Temporary Insert with the Environment Agency’s Flood Duty Manual allowing our workforce to be notified in the event of a flood. A detailed flood plan was created for this purpose
