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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
� accidental spillages:
- spillages could potentially occur during use and transport of materials, wastes and fuels
to or from storage areas on the site. Spills can occur as a result of inappropriate storage
facilities, or because of poor construction practices on the site. Depending on the volume,
location and nature of the spillage, contaminants could reach Middle Drain and bind to
sediment or be discharged to the Estuary. Substances that bind to sediment can
potentially be released at a later time in a more biologically active soluble form, or be
dispersed in the water and reach receptors further downstream i.e. the Humber Estuary.
These spillages could also be harmful to aquatic ecology and affect the aesthetic water
quality of the receptor water bodies. The installation of bunded areas to store liquids (e.g.
oils, diesel, paint and cleaning chemicals) will minimise the possibility of uncontained
spills.
� use and maintenance of plant equipment:
- the use and maintenance of plant, vehicle and equipment can 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 waste streams discharges:
- aqueous wastes water streams may include, for example, those arising from vehicle plant
washing, dewatering activities (if applicable) and on site facilities for personnel. If
discharged, such releases could potentially increase the concentrations of pollutants in
Middle Drain and subsequently in the Humber Estuary. Discharge of any waters
(including silted waters) would require permission from the EA, which must be requested
well in advance of the start of construction activities.
� migration of contaminants from contaminated land:
- if soils are contaminated, soil stripping and vegetation removal can increase the potential
for, and volume of, contaminated surface water runoff. As discussed in Chapter 7 there is
no evidence to suggest that the site is contaminated (this will be confirmed once the GI
survey results are available).
� delivery of higher loads of fine sediment:
- increased traffic on site, movement of construction machinery, excavation activities, soil
stripping and or temporary stockpiling of dusty material 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.
� litter accumulation in waterbodies:
- increased activity on site may potentially cause litter accumulation in the Middle Drain
affecting the aesthetics of the waterbody and causing harm to any aquatic ecology. Litter
may subsequently be washed downstream to the Humber Estuary.
8.48 In general, the application of good practice during construction should ensure that the significance
of any effect would be limited to Minor at worst. Numerous examples of good practice are
provided in PPG 5 54 and PPG 6 55 . These will be taken into consideration in the development of
the CEMP.
5100935.404 Environmental Statement August 2011 121