Environmental Statement - Maersk Oil

Balloch Field Development Environmental Statement
Appendix B ‐ Environmental Assessment
Disposal to land General waste from
drilling operations
and support vessels.
Physical presence Installation of rig and
presence of vessels
Drilling rigs and support vessels
generate a number of wastes
during routine operations
including waste oil, chemical &
oil contaminated water, scrap
metal domestic wastes etc.
Positioning of semi‐sub rig at
wells using anchors (12) and
chains
Support vessel e.g. anchor
handling vessels & tug vessel,
movements.
Under water noise Noise and vibration Sources include
semi‐sub drilling operations &
support vessels
Minor accidental
events
Chemical spills Chemical storage‐ accidental
spills, leaks, containment
damage.
5 1 Low
Impacts associated with onshore disposal are dependent on
the nature of the site or process. Landfills – land take,
nuisance, emissions (methane), possible leachate, limitations
on future land use. Treatment plants‐ nuisance, atmospheric
emissions, potential for contamination of sites.
Likelihood Consequence Risk
5 1 Low
The drilling rig will have an impact on the seabed due to the
anchor spread.
Presence of a rig and the increase in associated vessel
movements has the potential to impact other users of the sea
Likelihood Consequence Risk
5 1 Low
Generates elevated sound levels which can affect the
behaviour of fish and marine mammals in the area.
Likelihood Consequence Risk
5 1 Low
May result in a variety of impacts including increased
chemical or biochemical oxygen demand, toxicity, persistence,
bioaccumulation in animals
Likelihood Consequence Risk
2 2 Low
Wastes will be minimised by use
of appropriate procurement
controls.
All wastes to be properly
segregated for recycling/disposal/
treatment onshore.
Waste will be dealt with in
accordance with regulatory
requirements.
The rig will be present for as short
a time as possible.
Rig moves will be minimised.
Other users of the area will be
notified.
Use of vessels kept to a minimum.
The rig will be present over a
relatively short period of time.
Minimise rig movements.
Optimised quantities procured &
stored. COSHH, Task Hazard
Assessments are completed and
MSDS sheets are available.
Transfer operations suspended in
rough weather. Bulk hoses and
connections inspected before and
after use by competent personnel.
Hoses on bard the NTVL are
replaced annually.
OPEP procedures followed
Contribute to landfall
waste. Low impact.
Short term and very
localised impact .
No long term impacts to
other sea users.
Low impact
Contribute to increase in
ambient noise levels. Low
impact.
Mitigation measures will
ensure risk of chemical
spill are within tolerable
risk levels. Low impact.
B ‐ 3