Mann Agricultural Supply, Inc. - Executive Summary
Mann Agricultural Supply |
Risk Management Plan - Executive Summary
The accidental release prevention policy at Mann Agricultural Supply involves, but is not limited to technologies, procedures, and management practices. This facility conforms to the laws and regulations of the state of Nebraska. Our emergency response policy involves the preparation of response plans that are tailored to our facility and to the emergency response services available in our community, and is in compliance with the EPA Emergency Response Program requirements.
This facility is in the business of selling anhydrous ammonia to farm customers as a form of nitrogen fertilizer. The facility has one anhydrous ammonia storage tank one with a capacity of 18,000 gallons water capacity. One storage tank, several anhydrous ammonia nurse tanks, risers for filling nurse tanks, electrical panels, lighting, and safety equipment are all parts of this facility's anhydrous ammonia operation. The f
acility operates with normal business hours during the spring and fall season.
The off-site consequences analysis includes two anhydrous ammonia release scenarios, identified as "worst-case" release and "alternative" release scenarios. The first scenario is defined by EPA and shall assume the maximum quantity of the largest vessel is released as a gas in 10 minutes due to a catastrophic break. The alternative release scenario is defined as a more likely accidental release of anhydrous ammonia caused by a transfer hose failure.
The "worst-case" release scenario involves a catastrophic failure of the tank releasing the entire 85,000 pounds of anhydrous ammonia. The off site consequences were calculated using "TFI's RMP Guidance for Ammonia Retailers". The worst case scenario used EPA's recommended wind speed of 1.5 meters per second with an "F" atmospheric stability class. A rural topography was selected as typical. The distance to the endpoint was 2.18 miles. It is estimated that
8700 people would be affected by this release.
The "alternative release" scenario assumed a hose breaks and leaks 7,200 pounds of anhydrous ammonia. The EPA recommended wind speed of 3.0 meters per second with a "D" atmospheric stability class was used in this scenario. Using rural topography and "TFI's RMP Guidance for Ammonia Retailers" the toxic endpoint is .46 mile. The population with in that area is estimated to be 2500 people. The assumption is that the duration of the release is 2 minutes because equipment, excess flow valves, and human intervention will stop the leak.
Mann Agricultural Supply has had no anhydrous ammonia leaks within the past five years. Even though the company has had no releases it still coordinates annual visits with the local fire department to review the systems and procedures for response to a leak.
Mann Agricultural Supply has several key elements in their accident prevention plan:
1. The anhydrous ammonia system adheres to the laws and regu
lations of the State of Nebraska.
2. Annual training is required of all personnel on handling, transferring, or transporting anhydrous ammonia. The training includes properties of ammonia, safe handling practices, first aid, and emergency response.
3. Use of good management practices as specified by industry standards and training aids.
4. Frequent site inspections by management and safety consultants.
5. Annual inspections include safety equipment, tanks, and handling equipment.
6. Use of proper anhydrous ammonia personal protective equipment and safety equipment.
Changes are made in the system when necessary or when required by regulation change. Periodic evaluations of the procedures help to determine whether or not a change in operations should be made to provide increased safety to the operators and to the community.