Risk Management Plan Data Elements

3. Toxics: Alternative Releases

Complete for each toxic regulated substance held above the threshold quantity in a Program 2 or Program 3 process.

3.1 Chemical: The name of the regulated chemical evaluated in the alternative release scenario.

3.2 Physical state: Indicate with a check mark the physical state of the chemical as it is released in the scenario. See question 2.2 of this guidance for an explanation of each physical state.

3.3 Results based on: Indicate with a check mark whether you used the reference tables provided in the OCA guidance or conducted modelling to calculate your worst-case release. If you performed modelling, you must also indicate which model was used.

3.4 Scenario (check one): Indicate with a check mark which of the following scenarios describes your alternative release scenario.

1. Transfer Hose Failure: Failure of the connection between two or more vessels.

2. Pipe Leak: Release through a rupture in a pipe.

3. Vessel Leak: Release through a rupture in a vessel.

4. Overfilling: Release due to filling a pipe, vessel, or other container past its capacity.

5. 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.

6. Excess Flow Valve Failure: Release caused by the failure of excess flow device to function properly and prevent surges from reaching downstream equipment.

7. 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.

3.15 Passive mitigation considered: Mitigation means specific activities, technologies, or equipment designed or deployed to capture or control substances upon loss of containment to minimize exposure of the public or the environment. Passive mitigation means equipment, devices, or technologies that function without human, mechanical, or other energy input. Check all that were considered in defining the release quantity or rate of the alternative release scenario. See question 2.15 of this guidance.

3.16 Active mitigation considered: Mitigation means specific activities, technologies, or equipment designed or deployed to capture or control substances upon loss of containment to minimize exposure of the public or the environment. Active mitigation means equipment, devices, or technologies that need human, mechanical, or other energy input to function. Check all that were considered in defining the release quantity or rate of the alternative release scenario.

1. Sprinkler Systems: A system for protecting a building against fire by means of overhead pipes which convey an extinguishing fluid through heat activated outlets.

2. Deluge Systems: A system to overflow an area of a release with water or other extinguishing fluid.

3. Water Curtain: A spray of water from a horizontal pipe through nozzles, the curtain may be activated manually or automatically.

4. Neutralization: Making a toxic chemical harmless through chemical reaction.

5. Excess Flow Valve: A system for diverting overflow.

6. Flares: A device for disposing of combustible gases from a chemical process by burning them in the open.

7. Scrubbers: A pre-release protection measure that uses water or aqueous mixtures containing scrubbing reagents to remove discharging liquids and possibly also treating the discharging chemical.

8. Emergency Shutdown Systems: Controls that are triggered when process limits are exceeded and that shut down that process.

9. Other (specify)

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