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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
8.57 Clean rainwater that collects in the bunds will drain to the Drainage System. Any spills will collect
in the bund until they can be removed and disposed of offsite.
Potential Operational Impacts
8.58 The operation of the acetylene facility will be closely monitored and managed by means of an EP
and an ISO 14001 accredited EMS. The following are identified as activities that could potentially
result in deterioration in water quality of the receptor water bodies during the operation phase:
� increasing potential for contaminates, including hydrocarbons, to reach receptor waterbodies:
- inappropriate materials handling, transfer and storage (e.g. accidental spillages) may
cause release of contaminates to the Middle Drain with subsequent release to the
Humber Estuary. BAT and the EIGA Code of Practice for acetylene 15 will be followed with
regards to the storage of all chemicals, wastes and products.
� use and maintenance of plant equipment:
- the use and maintenance of lifting equipment and vehicles could result in fuel leaks etc.
Depending on the volume, location and nature of the release, contaminants could reach
Middle Drain and bind to sediment or be discharged to the Estuary (as described above).
� aqueous discharges (clean surface water runoff, treated domestic effluent, water from
regenerating the water softener, clean water from regenerating the dryers and clean water
from the OWS for the gas and air compressors) to Middle Drain;
- Discharges into Middle Drain and subsequent flow into the Humber Estuary could
theoretically cause deterioration in water quality of these water bodies. However, the
discharges will be essentially clean water and will require consent from the EA and or
NELDB. These discharges would have to have negligible impact in order to be
consented.
� increased area of hardstanding:
- the development will introduce an area of 1.5 ha of hard standing, which will potentially
cause increased surface water runoff and higher sedimentation rates higher suspended
solids load in the receptor water bodies. The drainage network will incorporate catch pits
to capture silt from surface water runoff prior to discharge.
� delivery of higher loads of fine sediment:
- increased traffic on site could result in the generation and deposition of windblown dust
and or water containing elevated levels of sediment. If these sources were to reach
Middle Drain, the increased sedimentation would lead to a higher suspended solids load
in the Middle Drain (and subsequently the Humber Estuary), which could eventually
cause silting, restrict flow and cause damaging effects (smothering) to aquatic
organisms. The drainage network will incorporate catch pits to capture silt from surface
water runoff prior to discharge.
Impact Assessment
8.59 This impact assessment is undertaken using the baseline descriptions of the two receptors, and
the duration and permanence of the impact. The impact assessment is presented in Table 8.6 for
the construction phase and Table 8.7 for the operational phase. The assessment takes into
consideration the high dilution capacity of the Humber Estuary which would reduce the impact of
any pollutants entering the watercourse.
5100935.404 Environmental Statement August 2011 123