This recommended practice provides methods for responding to
fire and explosion hazards resulting from the release of a
flammable or combustible liquid, gas, or vapor that can migrate to
a subsurface structure.
Although this recommended practice is intended to address only
fire and explosion hazards, other authorities should be consulted
regarding the environmental and health impacts and other hazardous
conditions of such releases.
This recommended practice outlines options for detecting and
investigating the source of a release, for mitigating the fire and
explosion hazards resulting from the release, and for tracing the
release back to its source.
The options outlined in this recommended practice are not
intended to be, nor should they be considered to be, allinclusive
or mandatory in any given situation. If better or more appropriate
alternative methods are available, they should be used.
The procedures outlined in this recommended practice can apply
to hazardous substances other than flammable and combustible
liquids that might have adverse human health effects. However, the
physical characteristics of the specific hazardous substance
released must be understood before any action is taken.
The purpose of this recommended practice is to provide
regulatory officials, fire authorities, contractors, and owners of
subsurface structures guidance on problems involving flammable and
combustible liquids and gases that might be found in subsurface
structures and other areas.
The responsibility for correct handling of a suspected release
of a flammable or combustible liquid or gas or the potential hazard
from such a release will be shared by various individuals,
organizations, and regulatory agencies.
The successful handling of these problems will depend on the
best possible cooperation among those individuals, organizations,
and regulatory agencies.
This recommended practice is intended for the information of all
organizations and persons involved.
Owners, operators, or others who become aware of a hazardous
condition should notify the fire department, police, or other
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