Aurora Cooperative - Grand Island Terminal - Executive Summary

| Accident History | Chemicals | Emergency Response | Registration | Source | Executive Summary |

The Aurora Cooperative Elevator Company's accidental release prevention policy involves a unified approach that integrates technologies, prodecures, and management practices.  The Aurora Cooperative emergency response plan involves the response services available in the community.  Aurora Cooperative bulk Anhydrous Ammonia faciliites have been strategically located to provide a local retail facility for this form of affordable nitrogen fertilizer for agricultue.  This location, at 920 N. Shady Bend Road in Grand Island is made up of one 30,000 gallon pressurized storage vessel and two loadout risers.  It serves the Hall and Merrick County areas.  This facility is normally unmanned, except during fertilizer season, although the adjacent grain elevator and office are normally manned during business hours.  The offsite consequence analysis includes consideration of two anhydrous ammonia release scenarios, identified as "worst case release" and "alternative scenario".  The first scenario i 
sdefined by EPA, which states the "owner or operator shall assume that the...maximum quantity of the largest vessel...is released as a gas over a 10 minute period, due to an unspecified failure".  The alternative release scenario is defines as "more likely to occur that the worst case scenario".  Atmospheric dispersion modeling has to be performed to determine the distance traveled by the anhydrous ammonia released before it's concentration is decreased to a "non-toxic" level.  For this purpose, Aurora Cooperative has chosen to use RMP-Comp Version 1.05 to determine the distance to the toxic endpoint (.14 mg/l or 200 ppm).  To determine the population affected by a potential release, we used maps extracted from Landview 3 software.  The worst case release for Aurora Cooperative - G.I. Terminal involves a failure of the 30,000 gallon pressurized storage vessel while it contains 85% (maximum allowed capacity) of it's capacity.  The alternative release scenario is based on the failure of  
a three inch transfer hose,  assuming complete failure of the in-line check valve and that the excess flow valve takes two minutes to close.
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