Nehawka Farmers Cooperative - Mynard - Executive Summary

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Nehawka Farmers Cooperative - Mynard 
Risk Management Plan - Executive Summary 
The accidental release prevention policy at Nehawka Farmers Cooperative involves, but is not limited to technologies, procedures, and management practices.  All applicable laws and regulations of the State of Nebraska are adhered to.  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 three anhydrous ammonia storage tanks, one with a capacity of 30,000 gallons water capacity, the other two with a capacity of 11,000 gallons of water.  The storage tanks, several anhydrous ammonia nurse tanks, risers for filling nurse tanks, electrical panels, lighting, and safety equipment are all par 
ts of this facility's anhydrous ammonia operation.  The facility is manned during the season and is operational through normal business hours. 
The off-site consequences analysis includes two anhydrous ammonia release scenarios, identified as "worst-case" release and "alternative" release scenario.  The first scenario is defined by EPA and shall assume the maximum quantity of one 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 largest tank, releasing the entire 131,325 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 a "F" atmospheric stability class.  A rural topography was selected as typical.   
The distance to the endpoint was 2.60 miles. It is estimated that 5,194 people would be affected by this release. 
The "alternative release" scenario assumed a hose breaks and leaks 7,127 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 urban topography and "TFI's RMP Guidance for Ammonia Retailers" the toxic endpoint is 0.46 mile.  The population with in that area is estimated to be 63 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.   
Nehawka Farmers Cooperative 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. 
Nehawka Farmers Cooperative has several key elements in it's accident prevent 
ion plan: 
1. The anhydrous ammonia system adheres to the laws and regulations of the State of Nebraska as enforced by the State Fire Marshall. 
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 by Nebraska State Fire Marshall's inspectors 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.
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