Clark County Farmers Elevator Ammonia Facility - Executive Summary

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             Risk Management Plan (RMP) - Ammonia 
                      Executive Summary 
        Clark County Farmers Elevator Ammonia Facility 
                     Clark, South Dakota 
 1. Accidental Release Prevention and Emergency Response Policies 
We at Clark County Farmers Elevator Ammonia Facility in Clark are strongly committed to 
employee, public, and environmental safety.  This commitment is an inherent part of our 
comprehensive accidental release prevention program that covers areas such as design, installation, 
operating procedures, maintenance, and employee training associated with the processes at our 
facility.  It is our policy to implement appropriate controls to prevent possible releases of regulated 
substances.  If such a release does occur, our trained emergency response personnel are at hand to 
control and mitigate the effects of the release.  We also coordinate our response efforts with the 
Fire Department, which provides additional emergency response expertise. 
 2. Stationary Source and Regulated Substances Handled 
Our facility's primary activities include support services for crop production.  We have anhydrous 
ammonia stored in a 30,000-gallon tank at our facility in Clark (Figure 1).  The maximum amount 
stored is 25,500 gallons (131,223 pounds) at the maximum fill capacity of 85%. 
 3. Worst Case Release and Alternative Release Scenarios 
We utilized RMP PRO for the worst case and alternate case scenarios of the required offsite 
consequence analysis for our facility.  The following details these scenarios. 
The worst case release scenario involves a catastrophic release of the entire contents of the  
anhydrous ammonia storage tank (131,223 pounds) in gaseous form over a 10-minute period.  At 
Class F atmospheric stability, 1.5 m/s wind speed, and urban topography, the maximum distance to 
a toxic endpoint of 0.14 mg/L is 5.2 miles (Figure 2).  The estimated populatio 
n within a 5.2-mile 
radius of this facility is 2,150. 
The alternative release scenario involves a release from an anhydrous ammonia product line.  The 
scenario involves the release of 6,854.78 pounds of ammonia in a gaseous form over a period of 30 
minutes.  Under neutral weather conditions, the maximum distance to the toxic endpoint of 0.14 
mg/L of ammonia is 0.19 mile (Figure 3).  The estimated population within a 0.19-mile radius of the 
facility is 425. 
 4. General Accidental Release Prevention Program 
Our facility has taken all the necessary steps to comply with the EPA's accidental release prevention 
requirements as set forth in 40 CFR part 68.  The following sections briefly describe the elements 
of the release prevention program that is in place at our stationary source. 
Process Safety Information 
Clark County Farmers Elevator Ammonia Facility maintains a detailed record of safety information 
that describes the chemical hazards, operating parameters, and equipment designs a 
ssociated with 
all processes (Appendix D). 
Process Hazard Analysis 
Our facility conducts comprehensive studies to ensure that hazards associated with our processes are 
identified and controlled effectively.  Any findings from the hazard analysis are addressed in a 
timely manner. 
Operating Procedures 
Clark County Farmers Elevator Ammonia Facility maintains written operating procedures to ensure 
that activities within our covered processes are conducted safely.  These procedures address various 
modes of operation; the information is regularly reviewed and is readily accessible to operators 
involved in the processes (Appendix B). 
Clark County Farmers Elevator Ammonia Facility has a comprehensive training program in place 
to ensure that employees who are operating processes are competent in the operating procedures 
associated with these processes. 
Mechanical Integrity 
Clark County Farmers Elevator Ammonia Facility conducts documented maintenance checks on 
process equipment to  
ensure proper operation.  Maintenance checks are conducted by qualified 
personnel with previous training in maintenance practices.  Examples of process equipment that 
would receive maintenance checks include:  pressure vessels, storage tanks, piping systems, relief 
and vent systems, emergency shutdown systems, controls, and pumps.  Any equipment deficiencies 
identified by the maintenance checks are corrected in a safe and timely manner (Appendix C). 
Management of Change 
Written procedures are in place at Clark County Farmers Elevator Ammonia Facility to manage 
changes in process chemicals, technology, equipment, and procedures.  Process operators, 
maintenance personnel or other employees whose job tasks are affected by a modification in process 
conditions are promptly notified of the modification and offered training to deal with it. 
Pre-startup Reviews 
Clark County Farmers Elevator Ammonia Facility routinely conducts pre-startup safety reviews 
related to new processes and modificati 
ons in established processes.  These reviews are conducted 
to confirm that construction, equipment, and operating and maintenance procedures are suitable for 
safe startup prior to placing equipment into operation. 
Compliance Audits 
Clark County Farmers Elevator Ammonia Facility conducts compliance audits on a regular basis to 
determine whether the plan's provisions, set out under the 40 CFR part 68, are being implemented.  
Any non-compliance issue discovered during the audit is promptly corrected. 
Employee Participation 
Clark County Farmers Elevator Ammonia Facility truly believes that process safety management 
and accident prevention is a team effort.  Company employees are strongly encouraged to express 
their views concerning accident prevention issues and to recommend improvements.  In addition, 
our employees have access to all information created as part of the facility's implementation of the 
RMP, particularly information resulting from process hazard analyses. 
 5. Five-year A 
ccident History 
Clark County Farmers Elevator Ammonia Facility has had an excellent record of preventing 
accidental releases over the last 5 years.  Due to our stringent release prevention policies, no 
accidental release has occurred during this period. 
 6. Emergency Response Plan 
Clark County Farmers Elevator Ammonia Facility maintains a written emergency response plan to 
deal with accidental releases of hazardous materials.  The plan addresses all aspects of emergency 
response including first aid and medical treatment, evacuations, and notification of local emergency 
response agencies and the public (Appendix A).
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