CDOIF Guidance

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Safety and environmental standards for fuel storage sites
Final report
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Table 5 Environmental risk assessment checklist
Action/parameter Guidance
For the worst-case foreseeable severe pool fire scenario severe pool fire or multiple tank /
multiple bund fire (following an explosion or due to escalation)
Identify firewater volumes Energy Institute IP19
Assess firewater management
effects
Identify bund potential failure
points
MIIB second progress report47
For each failure point, assess:
likely liquid/firewater flow ––
and volume
direction of escaped liquid ––
flows
For the worst-case catastrophic tank failure
Identify expected liquid volumes,
flow directions and receiving
locations outside bund walls
For the surrounding environment, construct a conceptual site model
Construct conceptual site
model
EI Environmental guidelines for petroleum distribution installations48
Identify surrounding
environmental receptors, for
example sites of special scientific
interest, rivers, agricultural land.
Classify in terms of receptor type
and sensitivity/importance
Environment Agency: ;
Natural England: ;
Scottish Environment Protection Agency:
Scottish National Heritage:
Defra Tables 1–12:
chemicals/accident/documents/comah.pdf
Identify geological
characteristics
Identify hydrogeology British Geological Survey
Identify flow gradients and likely
flow outcomes
Identify direct pathways, for
example drains, boreholes
Identify indirect pathways to
sensitive receptors, for example
permeable ground
Assess permeability of ground
and thus permeation flow-rates
and quantities of pollutant into
ground
CIRIA 164
Consider appropriate defensive tertiary containment measures
Kerbing to roadways, car parks
etc, toe walls, area grading
Eliminate direct pathways, for
example cap boreholes
Emergency drain seals (for
example auto-actuated bellows)
Overflows to remote
containment lagoons
Channel spillages to remote
containment
Additional hardstanding
Dedicated tankage
Transfer to other secondary
containment