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Row DETR
Table Ref
Receptor
Type
Severity of Harm
Reference to
Table 2
Comments
Significant
While this level of
harm might be
significant pollution, it
is not considered a
Severe
DETR Criteria - the
lowest level of harm
that might be
considered MATTE.
Major
Catastrophic
Corresponding
Harm/Duration /
Recovery row in Table
2
The 'Severe' to
'Catastrophic' levels of
harm are considered to
be included as 'Serious'
with respect to the
COMAH definition of a
major accident.
MATTE.
Severity Level ĺ
1
2
3
4
Receptors include:
WFD Chemical or
WFD Chemical or
WFD Chemical or
ecological status
lowered by one class
for 2-10km of
ecological status
lowered by one class
for 10-200km of
ecological status
lowered by one class
for >200km of
15
12
Fresh and
estuarine water
habitats
Impact below that of
Severity level 2
watercourse or 2-20ha
or 10-50% area of
estuaries or ponds.
watercourse or 20-
200ha or 50-90% area
of estuaries and
watercourse or
>200ha or >90% area
of estuaries and
Surface Water
Plus interruption of
ponds. Plus
ponds. Plus
drinking water
interruption of drinking interruption of drinking
supplies, as per DETR water supplies, as per
water supplies, as per
Table 6
DETR Table 6
DETR Table 6
Notes for Table 1:
In applying the criteria on this sheet, an estimate of the mean population of species will be required, subject to data available. Variability in population might
be relevant for later detailed scenario assessments, but a mean is more relevant to the initial selection criteria here.
When applying the criteria above, note that receptors are not mutually exclusive - for example some sites are both Ramsar and SSSI, while the 'widespread
habitat' rows might apply irrespective of any specific designations.
To avoid disproportionate application of percentage criteria on small receptors, for small sites, the percentage criteria will not reduce the threshold to lower
than half the area/distance criteria.
Guideline – Environmental Risk Tolerability for COMAH Establishments v1.0
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