Environmental Statement - Maersk Oil
Environmental Statement - Maersk Oil
Environmental Statement - Maersk Oil
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B ‐ 2<br />
Halocarbon release<br />
during emergency<br />
events<br />
Discharges to Sea Deliberate discharges<br />
from drilling<br />
operations<br />
Contained and<br />
treated drilling fluids<br />
Contained and<br />
treated drainage<br />
water<br />
Liquid waste<br />
(domestic sewage)<br />
Fire fighting systems can be<br />
designed to release harmful<br />
halocarbons<br />
WBM and cuttings, brine,<br />
cementing chemicals & clean<br />
up chemicals all required in<br />
the drilling process<br />
Rotomill treated OBMs, OBM<br />
contaminated brine spacer,<br />
cuttings & cleaning chemicals.<br />
Other oily slops.<br />
Open drains collect spills &<br />
drainage water from all<br />
hazardous areas on the rig.<br />
These drains feed into the<br />
drainage cassion which<br />
provides oil & water<br />
separation.<br />
Discharge of sewage (grey &<br />
black water macerated to <<br />
6mm prior to discharge via a<br />
sewage caisson).<br />
2 1 Low<br />
Halons cause depletion in the upper atmosphere and are<br />
regarded as greenhouse gases<br />
Likelihood Consequence Risk<br />
2 1 Low<br />
Short term impact on water quality and localised smothering<br />
of seabed and associated biota<br />
Likelihood Consequence Risk<br />
5 2 Moderate<br />
Release of untreated OBM’s can result in toxic or sub‐lethal<br />
effects on sensitive organisms and ecosystems.<br />
Bioaccumulation of heavy metals in marine organisms. Burial<br />
of benthic organisms/ modification to the benthic<br />
environment.<br />
Likelihood Consequence Risk<br />
5 1 Low<br />
Uncontrolled discharge of oil in water can result in narcotic,<br />
toxic, teratogenic impacts and localised water column<br />
enrichment etc.<br />
Likelihood Consequence Risk<br />
2 2 Low<br />
Sewage and food waste has a high BOD resulting from organic<br />
& other nutrient matter in the detergents & human wastes<br />
that can impair water quality in the immediate vicinity of the<br />
discharge.<br />
Likelihood Consequence Risk<br />
Balloch Field Development <strong>Environmental</strong> <strong>Statement</strong><br />
Drilling rig contractors are phasing<br />
out halons in compliance with<br />
legal requirements.<br />
Halocarbons will only be used in<br />
the event of a fire.<br />
Maximum efficient use of WBM.<br />
Brine contaminated with oil to be<br />
shipped to shore for treatment<br />
and disposal<br />
Use of PLONAR chemicals (i.e. low<br />
toxicity chemicals).<br />
All OBM’s will be processed using<br />
Rotomill % of oil on cuttings<br />
discharged < 0.1%<br />
MARPOL compliant filtration and<br />
monitoring equipment with<br />
discharges of oil in water at less<br />
than 15ppm.<br />
Tanks and machinery spaces are<br />
fitted with bunding to collect<br />
spillages and waste.<br />
Drains are plugged on NTVL.<br />
Sewage treatment unit on board<br />
rig (MARPOL) and vessels to<br />
reduce BOD prior to discharge,<br />
this will aid biological breakdown<br />
on release.<br />
Appendix B ‐ <strong>Environmental</strong> Assessment<br />
None envisaged as the<br />
development should not<br />
lead to any releases.<br />
Negligible impact.<br />
Minimal discharge of<br />
WBM to sea with only<br />
localised temporary<br />
effects on the water<br />
column and seabed. Low<br />
impact.<br />
No detectable increase in<br />
the water column or<br />
sediments of any the<br />
OBM drilling fluids or<br />
chemicals discharged.<br />
Low impact.<br />
Good working practice<br />
will minimise any<br />
potential spillage.<br />
Negligible impact.<br />
Negligible impact.