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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
18.10 For operation, the assessment concluded that that there would be:
� no risk of contamination of on site crops (as they would no longer be present);
� a very low risk of contamination to humans on site and offsite, offsite property (buildings and
crops), groundwater and surface water, resulting in impacts of neutral significance; and
� a low risk of contamination to buildings on site, resulting in adverse impacts of minor
significance.
18.11 The assessment concluded that the planned design, management and control of the Dissolved
Acetylene Project in relation to contaminated land (and groundwater) are sufficient; thus no
specific mitigation measures have been identified and no recommendations have been made.
Hydrology and Water Quality
18.12 The two main water quality receptors are Middle Drain and the Humber Estuary. Middle Drain is
considered to have a ‘medium’ sensitivity; whereas the Estuary is considered to have a ‘very high’
sensitivity.
18.13 For the construction phase the following potential impacts were identified and assessed for their
effects to Middle Drain and the Humber Estuary:
� contamination resulting from :
- accidental spillages,
- use and maintenance of vehicles, plant and equipment,
- waste water discharges, and
- exposure of contaminated soils and subsequent surface water runoff mobilisation and
migration through groundwater;
� increased sedimentation due to construction activities; and
� deterioration in aesthetic quality due to accumulation of litter.
18.14 The assessment determined that:
� impacts to the Humber Estuary would be of neutral significance;
� impacts to Middle Drain associated with contamination resulting from exposure of
contaminated soils would be of neutral significance; and
� all of the other identified impacts to Middle Drain would be of minor adverse significance.
18.15 For the operational phase the following potential impacts were identified and assessed for their
effects to Middle Drain and the Humber Estuary:
� deterioration in water quality resulting from:
- the increase in potential for contaminants from inappropriate materials waste handling,
transfer and storage (e.g. accidental spillages) to reach the receptor water bodies,
- aqueous discharges, and
- the increase in hard standing areas, causing increased runoff, higher sedimentation rates
and higher suspended solids load in the receptor water bodies;
� contamination resulting from use and maintenance of vehicles, plant and equipment; and
� increased sedimentation due to increased traffic.
18.16 The assessment determined that all of the identified impacts would be of neutral significance for
both Middle Drain and the Humber Estuary.
5100935.404 Environmental Statement August 2011 300