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Supplement to Guideline – ‘Environmental Risk Tolerability for COMAH Establishments’
Complex Site Example v0.0
Page 18 of 35
Table 2
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Receptor Detail
Rather than try and identify every plausible receptor and threshold exceedance a review of the plausible pathways was
undertaken and a conservative selection for the receptor was made given the sites environmental setting. Whilst there are a
number of surface water receptors around the periphery of the site it was assumed each wold feed directly into the SAC to the
south of the site without any meaningful mitigation and therefore the assessment assumed a worst case threshold for the most
sensitive receptor. The receptor for each compartment was identified in the assessment tables generated.
Table 3
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MATTE Scenarios
The MATTE scenarios were tabulated for each compartment but assuming the worst case receptor only. All credible
scenarios were considered to have the potential to affect the same most sensitive receptor. Clearly, if through mitigation, this
receptor was discounted or inherited receptor specific mitigation measures then an analysis of alternative receptors would
need to be undertaken. For simplicity the key objective was seen to be the selection of an appropriate (conservative)
tolerability threshold. Where appropriate, as the assessment is progressed certain scenarios may be grouped into lower
severity threshold groups which will result in an adjustment in how the overall Establishment Risks are summed.
Table 4
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Dangerous Substances with Environmental Risk
At the case study site the substances are generally straight forward in terms of categorising the inventory and risk drivers for