View - North East Lincolnshire Council

BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
� rotary bored piling (cast in-situ) large or mini rig;
� continuous flight auger (CFA) piling (cast in situ); and
� hydraulic hammer piling (pre-cast) 5 tonne rig.
3.11 Driven (hammer) piling techniques are typically the noisiest. The design team has taken on board
concerns from NE, regarding the potential disturbance to over wintering birds, and CFA or bored
piling techniques will be considered in preference to driven piling. However, there may be
technical reasons relating to the ground conditions which dictate the final selection of the piling
method.
3.12 The buildings and structures that will require piled foundations, and an estimate of the number of
piles, are as follows:
� bridge abutments 24 piles (12 at each end of the bridge);
� Generator Building 22 piles;
� Cylinder and Bundle Filling Building 52 piles;
� Cylinder Examination Shop 24 piles;
� Lime Storage Tanks and Rotary Drum Filters 29 piles;
� Sort Dock 6 piles; and
� Piperack between the Generator Building and the Cylinder Examination Shop -13 piles.
3.13 Piling is likely to take place within the first four months of the construction phase during typical
construction hours (i.e. 0800 to 1600 hours Monday to Friday). The overall duration of the piling
activities will depend on the piling method that is selected. The actual phasing and construction
sequencing will be proposed by the Construction Contractor. It is expected that a single rig would
take two weeks to complete the piling works on the main site. Piling required for the bridge
abutments is likely to be undertaken as a separate phase and is expected to take no more than
one week. A plan showing the anticipated locations of piles is provided in Figure 3.1.
3.14 At this stage in the Project it is anticipated that the depth of the piles will be 14 m to 15 m. This will
be confirmed (or otherwise) as the project develops.
Construction Materials
3.15 It is likely that the majority of materials and process piping will be sourced and fabricated from
within the UK. Where feasible consideration will be given to bringing materials and equipment to
the site through Immingham Dock; however, imports are likely to be limited to a number of specific
vendor package items, e.g. compressor skids.
3.16 Two 2 m high earth embankments will be constructed along three sides of the main process area,
(as illustrated on Figure 3.2). The soil requirements for the these will be met, so far as possible, by
using the material that is excavated as a result of forming the Deluge Lagoon.
5100935.404 Environmental Statement August 2011 17