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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
� on site property receptors (buildings infrastructure): this is a new PPL because property was
not present in the baseline. The probability of the PPL is considered ‘unlikely’ and the
consequence is considered ‘minor’. Appropriate building materials will be used to prevent
derogation by contaminants (which, if present, may also have been removed). Vapour ground
gas measures will have been implemented (if required). The risk is identified as ‘very low’;
� on site property receptors (crops): this PPL no longer exists as the on site crops will have
been removed;
� offsite property receptor (crops): the probability of the PPL is considered ‘unlikely’ and the
consequence is considered ‘mild’. Operational activities are unlikely to result in exposure to
windblown, soil-derived dust contamination (because of pathway barriers) or in migration of
contaminants through groundwater (because of source removal, if present in the first
instance). The risk is identified as ‘very low’; and
� offsite property receptor (buildings): the probability of the PPL is considered ‘unlikely’ and the
consequence is considered ‘mild’. Operational activities are unlikely to result in migration in
groundwater or migration of vapours ground gas (because of source removal). The risk is
identified as ‘very low’.
7.77 Based on the above, the impact assessment is summarised in Table 7.4.
Table 7.4 Contamination Impact Assessment for the Operational Phase
Receptor Baseline Risk Operational Phase Significance
Human (on site) Very Low Risk Very Low Risk Neutral
Human (offsite) Very Low Risk Very Low Risk Neutral
Groundwater Very Low Risk Very Low Risk Neutral
Surface Water Very Low Risk Very Low Risk Neutral
Property (on site
buildings)
No Risk (not
present)
Very Low Risk Minor Adverse
Property (on site crops) Very Low Risk No Risk (Not Present) n/a (not present)
Property (offsite crops) Very Low Risk Very Low Risk Neutral
Property (offsite buildings) Very Low Risk Very Low Risk Neutral
Mitigation Measures
Construction
7.78 The assessment of construction impacts has been undertaken on the basis that good practice will
be employed and that a comprehensive CEMP will be prepared. The significance of construction
impacts has been assessed to be ‘Minor Adverse’ or ‘Neutral’. On this basis, no mitigation
measures are required.
Operation
7.79 Operational process emissions will be controlled as a result of the Project design (e.g. the
requirements of BAT), the implementation of good practice and regulation, monitoring and control
measures (e.g. through the EP and the EMS).
7.80 The significance of operational impacts has been assessed to be ‘Minor Adverse’ or ‘Neutral’. On
this basis, no mitigation measures are required
5100935.404 Environmental Statement August 2011 109