Managing and informing contractors
It is important that contractors
are fully briefed by port and harbour management
prior to the commencement of dredging and disposal
works. Contracting procedures may include the requirement
for method statements and risk assessments for operations
to be provided by the contractors. These should
be agreed by the port or harbour before the works
are allowed to proceed (ABP Research R707 1997).
When renewing contractors, CIRIA (1997) suggest
that tenders should considered from companies who
can demonstrate through good performance on similar
work and that they are competent to carry out the
work required. When briefing contractors consideration
should be given to the factors indicated below.
Issues to consider when briefing contractors about
dredging works in marine SACs
When briefing a contractor consideration should
be given to:
- providing information on the marine SAC and
the features for which the site was designated,
and if appropriate outlining areas which are particularly
sensitive to the effects of dredging at specific
times of year which were identified in the consent
process as a constraints to dredging operations,
- timing of operations,
- hydrodynamic conditions at the excavation and
- use of BATNEEC dredging methodology, and
- particular areas of the dredging and disposal
operations where contractor error can cause adverse
effects on marine features.
Dredger operators should follow proper safety procedures
to avoid accidents and spills, and ports and harbours
need to ensure that other vessel users are provided
with adequate information and instruction to avoid
conflict with the dredgers. In order to reduce the
potential for contractor error resulting in adverse
environmental affects, ports and harbours should
endeavour to regularly monitor the operations of
the contractor during dredging and disposal activities.
Bearing in mind a ports duty as a relevant
authority, with the possibility of judicial review
of its actions, the written instructions given to
dredging contractors, and documented monitoring
of their performance take on a new significance.
Within the last ten years education and training
on environmental issues has risen up on the agenda.
With regard to dredging, knowledge of the most effective
techniques can only be gained through experience.
Therefore it has been suggested that the relevant
labour force should be educated on marine environmental
matters to minimise the detrimental effects on marine
species as a result of the dredging process (ICE