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El Paso Energy Calhoun Gas Plant

Parent Companies:
El Paso Energy
EPA Facility ID:
Other ID:
Facility DUNS:
Parent Company DUNS:


183 Griggs Road
Calhoun, LA 71225
Lat / Long:
32.532, -92.369 (Get map)
Interpolation - Map
Center of Facility
Horizonal accuracy:
Horizontal reference datum:
Source map scale:


El Paso Field Services
(318) 222-2545
400 Travis Street
Suite 1140
Shreveport, LA 71101
Foreign Address:

Person responsible for RMP implementation:

Mike Perryman
Senior Environmental Scientist

Emergency contact:

Tony Billberry
Lead Technician
(318) 777-4001
24-hour phone:
(800) 203-1347
Ext or PIN:

Other contacts:

Facility (or company) email:
Facility phone:
Facility (or company) URL:


Local Emergency Planning Committee:
Full-Time Equivalent Employees:
Covered by OSHA PSM:
EPCRA section 302:
CAA Title Air Operating Permit:
CAA Permit ID#:
OSHA Star/Merit Ranking
Last Safety Inspection Date:
Nov. 20, 1998
Inspecting Agency:
State environmental agency
Using Predictive Filing:


Unspecified process
CBI claimed:
Program Level:
Natural Gas Liquid Extraction (211112)
Chemical name
Quantity (lbs.)
Flammable Mixture
Public OCA Chemical

RMP Preparer:


Foreign Address:


Latest RMP Submission:

June 24, 1999
First-time submission


Effective Date:
Other Reason:

2. Toxics: Worst-case


3. Toxics: Alternative release


4. Flammables: Worst-case

Some Risk Management Plan information is not provided in the available RMP data. You need to make an appointment at an EPA Reading Room In order to get access to details from the Off-Site Consequence Analysis (OCA) such as:

Instructions on how to make an EPA appointment can be found here.

Public OCA Chemical (in Unspecified process)
CBI claimed:
Model used:
EPA's OCA Guidance Reference Tables or Equations
Passive mitigation
  • None
not considered:
  • Blast walls

5. Flammables: Alternative release

Some Risk Management Plan information is not provided in the available RMP data. You need to make an appointment at an EPA Reading Room In order to get access to details from the Off-Site Consequence Analysis (OCA) such as:

Instructions on how to make an EPA appointment can be found here.

Public OCA Chemical (in Unspecified process)
CBI claimed:
Model used:
EPA's OCA Guidance Reference Tables or Equations
Passive mitigation
  • None
not considered:
  • Dikes
  • Fire wall
  • Blast walls
  • Enclosures
Active mitigation
  • None
not considered:
  • Sprinkler systems
  • Deluge systems
  • Water curtain
  • Excess flow valve

6. Five-year accident history

No Registered Accidents

7. Prevention: Program level 3

, Natural Gas Liquid Extraction (211112)
Prevention Program ID:
Safety Review Date
June 21, 1999, since latest RMP submission
PHA Update Date
Jan. 1, 1994, since latest RMP submission
PHA Techniques
Hazards Identified
  • Toxic release
  • Fire
  • Explosion
  • Overpressurization
  • Equipment failure
Process Controls
  • Vents
  • Relief Valves
  • Check Valves
  • Scrubbers
  • Manual Shutoffs
  • Automatic Shutoffs
  • Alarms
  • Emergency Air Supply
  • Emergency Power
  • Grounding Equipment
  • Inhibitor Addition
  • Rupture Disks
  • Excess Flow Device
Mitigation Systems
  • None
Monitoring Systems
  • Process Area
Changes since PHA
  • None
Training Type
  • Classrom
  • On the Job
Competency Testing
  • Written Test
  • Demonstration
  • Observation
Procedure Review Date
June 16, 1999, since latest RMP submission
Training Review Date
June 12, 1999, since latest RMP submission
Maintenance Review Date
June 17, 1999, since latest RMP submission
Maintenance Inspection Date
May 20, 1998, since latest RMP submission
Equipment Tested
Management of Change Most Recent Date
Nov. 14, 1997
Management of Change Review Date
Jan. 2, 1997
Pre-startup Review Date
Dec. 16, 1997
Compliance Audit Date
Jan. 1, 1997
Compliance Audit Change Completion Date
Incident Investigation Date
Incident Invest. Change Completion Date
Participation Plan Review Date
March 24, 1999
Hot Work Review Date
Sept. 10, 1998
Contractor Safety Review Date
March 24, 1999, since latest RMP submission
Contractor Safety Eval. Date
Dec. 23, 1997, since latest RMP submission

8. Prevention Program level 2

No Prevention Program level 2

9. Emergency response

Facility In Community Plan:
Facility Own Response Plan:
Specific Facility Response Plan:
Inform. Procedures in Response Plan:
Emergency Care in Response Plan:
Plan Review Date:
Response Training Date:
Local Response Agency:
Local Response Agency Phone:
(318) 343-1122
Subject To - OSHA EAP:
Subject To - CWA:
Subject To - RCRA:
Subject To - OPA:
Subject To - State EPCRA:
Subject To - Other:

Executive Summary


The Calhoun Gas Plant has a long-standing commitment to worker and public safety. This commitment is demonstrated by the resources invested in accident prevention, such as training personnel and considering safety in the design, installation, operation, and maintenance of the facility's processes. The El Paso Field Services (EPFS) policy is to implement reasonable controls to prevent foreseeable releases of substances.


EPFS operates the Calhoun Gas Plant located in Ouachita Parish, Louisiana. The Calhoun Gas Plant is a lean oil absorption plant designed for the extraction of liquid (LPG) Y-grade product. As evidenced in the ensuing text and based on criteria outlined in the Accidental Release Prevention Program (ARP), the Calhoun Gas Plant is a Program 3 process.

The Calhoun Gas Plant was evaluated to determine if any regulated flammable or toxic substances were present in the process and if they exceeded the threshold quantity. All equipment and vessels are considered to be connected and/or co-located; consequently, for the purposes of the ARP Program, all equipment and vessels are part of a single process. The identification of even a single vessel exceeding threshold quantities of a regulated flammable or toxic substance would subject a process to threshold determination for offsite consequence analysis.

EPFS identified two regulated flammable substances (LPG and natural gas) and zero regulated toxic substances along with the largest single vessel quantity stored. It was determined that a single vessel of flammable mixture (LPG) exceeded threshold quantity. The identification of this exceedance indicates that the Calhoun Gas Plant is a covered process with a regulated substance subject to threshold determination for offsite consequence analysis.


Worst-Case Scenarios (WCS)

The Environmental Protec
tion Agency (EPA) has defined a worst-case release as "the release of the largest quantity of a regulated substance from a vessel or process line failure that results in the greatest distance to a specified endpoint." A WCS analysis is required for each toxic substance in a covered process while only one WCS analysis is required for regulated flammable substances as a class. WCSs are assumed to occur at ground level with meteorological conditions defined as atmospheric stability class F (stable atmosphere), wind speed of 1.0 meters per second (2.2 miles per hour), and an ambient air temperature of 25:C (770F). Topography for WCSs are distinguished between rural and urban.

Flammable Substances

Regulated flammable substances or mixtures containing flammable substances include both gases and volatile liquids. The WCS assumes that the total quantity of a vapor cloud is released and detonates. The endpoint for a WCS involving a regulated flammable substance or mixture is an over pressure of 1 pound per square inch (psi). For a regulated flammable substance, consequence distance determination is based on its heat of combustion. For regulated flammable mixtures, the component with the highest heat of combustion can be used for consequence distance determination or, if preferred, directly calculated using equation C-1 of the Offsite Consequence Analysis Guidance Document (OCAGD). The quantity of a regulated substance/mixture used to determine distance to endpoint is the largest quantity of a regulated substance/mixture in a single vessel.

Flammable mixture (LPG) is a mixture of methane, ethane, propane, butanes, pentanes, and hexanes contained in a pressurized liquid storage vessel (vessel number D-811) having the capacity of approximately 40,570 gallons (168,769 lbs.). For the purpose of identifying the maximum release quantity for use in determining potential off-site impacts, it is assumed that the entire contents of the vessel are released to the atmosphe
re, forming a vapor cloud. Using the criteria outlined in the ARP rule, this mixture represents the facility's worst-case scenario for flammables.

Although methane was identified as having the highest heat of combustion (50,029 kjoule/kg) while acting only as a minor component (0.30 liquid volume %), it was determined that its use would provide a more conservative consequence distance. The distance to the endpoint of 1 psi overpressure for the worst-case release of the flammable liquid mixture was calculated and determined to be 0.46 miles. The distance to endpoint is greater than the distance to public receptors. The Calhoun Gas Plant is, therefore, classified as a Program 3 process under the ARP Program.

Toxic Liquids and Gases

Toxic gases include all regulated toxic substances that are gases at ambient temperature (temperature 25: C, 770F), even if they are stored as liquids under pressure or refrigeration. For the consequence analysis, a gaseous release of the total quantity is assumed to occur in 10 minutes, regardless of storage conditions. For toxic liquids, the total quantity in a vessel is assumed to be spilled onto a flat, non-absorbing surface. For toxic liquids carried in pipelines, the quantity that might be released for the pipeline is assumed to form a pool. Passive mitigation systems may be taken into account in consequence analysis for both toxic gases and liquids. The endpoint for air dispersion modeling to estimate the consequence distance for a release of a toxic gas and liquid is presented for each regulated toxic gas and liquid in Appendix B of the OCAGD in Exhibits B-1 and B-2, respectively.

The Calhoun Gas Plant does not have any toxic substances held above the threshold quantity. Analysis of one worst-case release scenario for each regulated toxic substance is, therefore, not required.

Alternative Release Scenarios (ARS)

An ARS describes an incident that is more likely to occur than those cited for a WCS. One ARS analysis
is required for each listed toxic substance in a Program 2 or 3 process that exceeds threshold quantity while only one ARS analysis is required for all flammable substances as a class. For ARSs, both active and passive mitigation systems can be considered.

Alternative release scenarios for flammable substances should have the potential to cause substantial damage, including on-site damage. Alternative release scenarios for toxic substances should be those that lead to concentrations above the toxic endpoint beyond the process fenceline. Those releases that have the potential to reach the public are of the greatest concern.

Calhoun Gas Plant Alternative Release Scenario for Regulated Flammables

A single ARS for the flammable mixture (LPG) is required under the ARP Program. A hypothetical, but likely to occur, release scenario has been identified for the LPG as follows. Seal failure on the transfer pump causes a release from a one-inch opening at a pressure of 425 psig and a temperature of 1500F. The release is assumed to continue for ten minutes. The flammable mixture (LPG) will vaporize and may ignite a vapor cloud explosion with an endpoint of 1 psi overpressure.

It was determined that a 10-minute release would involve 2,643 pounds of the flammable mixture (LPG). According to OCAGD Exhibit C-2 (Appendix C), the lower flammability limit (LFL) for the LPG is 33 mg/l. Using the appropriate table (Table 19), it was determined that a release of this amount of a buoyant gas in a rural area would result in an ARS endpoint distance of 0.20 miles.

Calhoun Gas Plant Alternative Release Scenario for Regulated Toxics

The Calhoun Gas Plant does not have any toxic substances held above the threshold quantity. Analysis of each regulated toxic substance is, therefore, not required.


The Calhoun Gas Plant has not had any accidental releases during the past five years that meet the criteria for an accidental release as discussed
in 40 CFR 68.42.


The Calhoun Gas Plant has coordinated its emergency response activities with the local emergency planning and response agencies as required in 40 CFR 68,12(b)(3).


The following is a summary of the accident prevention program in place at the Calhoun Gas Plant. Because plant processes are subject to EPA's RMP regulations and to OSHA's PSM standards, this summary addresses each of the OSHA PSM elements and describes the management system in place to implement the accident prevention program.

Employee Participation

EPFS and the Calhoun Gas Plant actively encourage all levels of employees and contract employees to participate in creating a safe work environment. This participation begins with well established mechanisms of communication with all employees regarding covered process information. Employees are involved in maintaining PSM rule compliance based on their knowledge, skill, job responsibilities, and experience. Specific ways that employees can be involved in the accident prevention program are documented in an employee participation plan that is maintained at the plant.

Process Safety Information

The Calhoun Gas Plant maintains written information intended to provide a foundation for identifying and understanding the process hazards. This information addresses chemical properties, inventories, and associated hazards, as well as for key process parameter limits and equipment design basis/configuration information. Specific departments within the plant are assigned responsibility for maintaining up-to-date process safety information.

Chemical-specific information, including exposure hazards and emergency response/exposure treatment considerations, is provided in the material safety data sheets (MSDSs). This information is supplemented, when required, by documents that specifically address known corrosion concerns and any known hazards associat
ed with the inadvertent mixing of chemicals. In addition, the plant has documented safety-related limits for specific process parameters and ensures limit maintenance by using highly trained personnel, process controls, and monitoring and protective instrument systems.

The plant also maintains documentation that provides information about the design and construction of process equipment. Equipment information includes construction materials, design pressure, and temperature and electrical ratings. EPFS utilizes Job Book Procedures for pumps, control and relief valves, API Standards for pipe, vessels, and tanks, and ANSI standards for the ESD system. This information also provides a basis for establishing inspection and maintenance activities, as well as for evaluating proposed process and facility changes to ensure that safety features in the process are not compromised.

Process Hazard Analysis (PHA)

The Calhoun Gas Plant has a comprehensive program to help ensure that hazards associated with the various processes are identified and controlled. Within this program, each process is systematically examined to identify hazards and ensure that adequate controls are in place to manage these hazards.

The Calhoun Gas Plant primarily uses the hazard and operability (HAZOP) study to perform these evaluations. A HAZOP uses a highly structured approach where process parameters such as flow and temperature are examined for deviations from their intended design. Deviation effects are considered in order to determine resulting potential hazards while preliminary recommendations for improvement are proposed.

The PHA team findings are promptly and systematically addressed. The Calhoun Gas Plant assures that the recommendations are documented and resolved in a timely manner. This documentation includes the actions to be taken and a written schedule of completion dates. The plant also provides proof of communication with operating, maintenance, and other employees whos
e work assignments are in the process and who may be affected by the recommendations.

To help ensure that the process controls and/or process hazards do not eventually deviate from the original design safety features, the plant periodically updates and revalidates the hazard analysis results. These periodic reviews are conducted at least every five years by the PHA team.

Operating Procedures

The Calhoun Gas Plant maintains written procedures that address various modes of process operations, such as (1) initial startup, (2) normal operations, (3) temporary operations, (4) emergency shutdown, (5) emergency operations, (6) normal shutdown, and (7) startup following a turnaround or after an emergency shutdown. These procedures can be used as a reference by experienced operators and provide a consistent training basis for new operators. Operating procedures are periodically reviewed and certified as current. When a process change occurs, operating procedures are revised as necessary through the management of change process.


To complement the written process operation procedures, the Calhoun Gas Plant has implemented a comprehensive training program for all employees. New employees receive job specific basic training in plant operations. Employee training includes emphasis on safety and health hazards, emergency shutdown operations, and safe work practices. Operators demonstrating adequate knowledge to safely perform duties and tasks are allowed to work independently.

Hot Work Permit

The Calhoun Gas Plant issues a hot work permit for all hot work operations conducted on or near a covered process. Procedures for issuing a hot work permit are clearly outlined in the EPFS Safety Manuel. The Calhoun Gas Plant provides Hot Work Permit training to all plant employees. Copies of issued work permits are maintained in Operations and Maintenance for a period of 1 year following completion of work.


The Calhoun Gas Plant periodically uses
contractors to perform maintenance or repair, turnaround, major renovations, or specialty work on or adjacent to a covered process. Because some contractors work on or near process equipment, the plant has procedures in place to ensure that contractors (1) are trained in the work practices necessary to safely perform his/her job, (2) have received and understood the training required and carry a training document card while on location, (3) follow the safety rules of the location including the safe work practices, (4) advise the plant of any unique hazards presented by the contractor, and (5) notify the facility of all illnesses and injuries that occur in the process areas.

Pre-Startup Safety Reviews (PSSRs)

The Calhoun Gas Plant conducts a PSSR for any facility modification that requires a change in the process safety information. The purpose of the PSSR is to ensure that safety features, procedures, personnel, and equipment are appropriately prepared for startup prior to placing the equipment into service. This review provides an additional check to make sure that construction and equipment are in accordance with design specification, that adequate safety, operating, maintenance, and emergency procedures are in place, and that training of each employee involved in operating the process or equipment has been completed. A standard checklist is used to document compliance.

Mechanical Integrity

The Calhoun Gas Plant has well-established programs, procedures and practices that are required to ensure that equipment used to process, store, or handle lightly hazardous chemicals and/or flammable gas or liquid is designed, constructed, installed, and maintained to minimize the risk of a release. Equipment examples include vessels, storage tanks, piping systems, and relief and vent systems with associated emergency shutdown systems and controls (i.e., monitoring devices, sensors, alarms, and interlocks).

Maintenance personnel receive training on (1) an overview o
f the process, (2) a review of the process hazards, and (3) the procedures applicable to the employee's job tasks to ensure that the employees can perform the job tasks in a safe and satisfactory manner. Process equipment inspection and testing follows recognized and generally accepted good engineering practices. Equipment deficiencies that are outside of acceptable limits are corrected before further use or in a safe and timely manner when necessary means are taken to ensure safe operation.

Management of Change

The Calhoun Gas Plant has a comprehensive system to manage and document changes to all covered processes. A systematic approach is followed to control and manage facility changes in order to minimize the possibility that such changes will have an adverse impact on personnel safety, equipment, or the environment. Employees involved in process operations and maintenance and contract employees whose job tasks might be affected by process changes are informed of and trained in the change prior to process start-up.

Incident Investigation

The Calhoun Gas Plant promptly investigates all incidents that resulted in, or reasonably could have resulted in, a fire/explosion, toxic gas release, major property damage, environmental loss, or personal injury. An incident investigation is initiated as promptly as possible to thoroughly investigate and analyze the incident. This investigation is lead by an incident investigation team consisting of those with appropriate knowledge and experience in the process. The findings and recommendations made by the incident investigation team are promptly addressed and resolved in a timely manner. The final resolution of each finding or recommendation is documented, and the investigation results are reviewed with all employees (including contractors) who could be affected by the findings.

Emergency Planning and Response

The Calhoun Gas Plant retains a written site specific formal emergency response plan which includes the
designated actions the company and all personnel will take to ensure personal safety from fire and other emergencies. The plan outlines actions that company technicians and contract employees are to take when there is an unwanted release of highly hazardous chemicals. The intent of this plan is to facilitate the prompt evacuation of employees when necessary and to account for all personnel. The emergency plan also includes procedures for handling small releases.

Compliance Audits

To help ensure that the accident prevention program is properly functioning, the Calhoun Gas Plant periodically conducts an audit to determine whether the procedures and practices required by the accident prevention program are being implemented. Compliance audits are conducted at least every 3 years. The audit team includes those knowledgeable in the process, operations personnel, and at least one person trained in audit techniques and practices. The audit team develops findings and corrective actions are tracked until they are complete. The final resolution of each finding is documented, and the two most recent audit reports are retained.