8
e. Rupture Disk/Relief Valve: Release due to failure of a rupture disk/relief valve to
function properly. A rupture disk/relieve valve is a valve that relieves pressure beyond a
specified limit and recloses upon return to normal operating conditions.
f. Excess Flow Valve Failure: Release caused by the failure of excess flow device to
function properly and prevent surges from reaching downstream equipment.
g. Other (specify)
3.5 Quantity released: Indicate the quantity of the chemical released during the alternative release
scenario in pounds.
3.6 Release rate: Indicate the rate of release in pounds per minute.
3.7 Release duration: Indicate the length of time in minutes for the vessel, pipeline, or other
location of the regulated substance to release the quantity indicated in question 3.5.
3.8 Wind speed: If you use the RMP OCA guidance, list 3 m/s. If you modeled your scenario
indicate the wind speed used. This wind speed should be the average daily wind speed based on
annual data collected at your site or at a local meteorological station.
3.9 Stability class: If you use the RMP OCA guidance, list "D" stability. If you modeled your
scenario indicate the stability used. The stability should be the average daily stability based on
annual data collected at your site or at a local meteorological station.
3.10 Topography (check one): Indicate with a check mark whether the local topography is urban or
rural. Urban means that there are many obstacles in the immediate area; obstacles include
buildings or trees. Rural means that there are few buildings or other obstacles in the immediate
area.
3.11 Distance to endpoint: Indicate the distance to the endpoint in miles for the chemical, using the
endpoint specified for the chemical in Appendix A of the risk management program rule.
3.12 Residential population within distance: Indicate the population within the distance to the
endpoint as specified in question 11 of this section. Populations should be estimated within a
circle with a center at the point of the release and a radius determined by the distance to the
endpoint. Populations estimated need only include residential populations and may be rounded
to two significant digits (e.g., 5,500, 11,000).
3.13 Public receptors: These are the public receptors within the distance to the endpoint specified in
the alternative release. Check all that apply. See question 2.13 of this guidance.
3.14 Environmental receptors within distance: Environmental receptors should be identified
within a circle with a center at the point of the release and a radius determined by the distance to
the endpoint. Check all that apply. See question 2.14 of this guidance.
