CDOIF Guidance

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CDOIF
Chemical and Downstream Oil
Industries Forum
CDOIF is a collaborative venture formed to agree strategic areas for
joint industry / trade union / regulator action aimed at delivering
health, safety and environmental improvements with cross-sector
benefits.
Appendix 4 – MATTE tolerability tables
Table 1 - Severity/Harm criteria for consideration as a major accident (based on unmitigated consequence)
Row DETRTable 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
MATTE.
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.
Receptors include:
Severity Level ĺ 1 2 3 4
1 1
Designated
Land/Water Sites
(Nationally
important)
<0.5ha or <10%
>0.5ha or
10-50% of site area,
associated linear
feature or population
>50% of site area,
associated linear
feature or population
N/A Land or
Surface Water NNR, SSSI, MNR
2 2
Designated
Land/Water Sites
(Internationally
important)
<0.5ha or <5% (<5%
LF/Pop)
>0.5ha or
5-25% of site area or
5-25% of associated
linear feature or
population
25-50% of site area,
associated linear
feature or population
>50% of site area,
associated linear
feature or population
Land or
Surface Water SAC, SPA, RAMSAR
3 3 Other designated
Land <10ha or <10% 10-100ha or
10-50% of land
>100ha or >50% of
land N/A Land ESA, AONB, National
Park, etc.
4 4 Scarce Habitat <2 ha or <10% 2-20ha or
10-50% of habitat
>20ha or >50% of
habitat N/A Land or
Surface Water
BAP habitats, geological
features
Guideline – Environmental Risk Tolerability for COMAH Establishments v1.0 Page 67 of 88