Western Farm Service, Walnut Grove - Executive Summary |
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Agrium / Western Farm Service Walnut Grove Facility 1. Facility Accidental Release Policy The owners, management, and employees of Western Farm Service's Walnut Grove facility (herein referred to as the Facility) at 14442 Walnut Grove / Thornton Rd., Walnut Grove, California, 93690 are committed to the prevention of any accidental release of anhydrous ammonia, and aqua ammonia. If an accidental release should occur, the facility is prepared to work with the local fire department, or other authorities to mitigate any release and minimize the impact of the release to people and the environment. A detailed emergency response plan has been developed and will be implemented in the event of an accidental release. 2. Facility Information The primary activity at the Facility is the storage, blending, and sale of fertilizers, in addition to, the sale of pre-packaged agricultural chemicals to farmers. Anhydrous ammonia is received, stored, and distributed for both direct application a nd for blending into mixed grade fertilizers for crop production nutrients. Anhydrous Ammonia is also used in the production of aqua ammonia and ammonium polyphosphate fertilizer. Anhydrous ammonia is stored in two 18,000-gallon storage tanks (bullets) at the site. The maximum quantity of anhydrous ammonia handled in this process is 183,600 pounds. Aqua ammonia (upto 30% of ammonia by weight) is produced and stored at the site using an aqua ammonia convertor and stored in one 80,000-gallon above ground tank at the site. The storage tank is located within a secondary containment structure. The maximum quantity of aqua ammonia handled is 604,000 pounds. The total quantity of ammonia present in the aqua ammonia, based on 30% active ingredient by weight, is 181,200 pounds. 3. The Worst-Case Release Scenario and Alternative Release Scenario A. Anhydrous Ammonia Alternative Release Scenarios One alternative release scenario is failure of the largest storage tank when filled to the greatest amount releasing 83,000 pounds of anhydrous ammonia, which represents the volume of the largest storage tank at 85% capacity as limited by regulations. The distance to the endpoint (point of dispersion to 200 ppm) is 2.16 miles. The second alternative release scenario, based on the PHA scenarios (or the most likely potential incident) and is a release of 11,908 pounds of anhydrous ammonia from a broken 2-inch diameter pipe. The distance to the endpoint (point of dispersion to 200 ppm) is 1.18 miles. B. Aqua Ammonia Worst-Case and Alternative Release Scenarios The worst-case scenario is failure of the largest storage tank when filled to the greatest amount would release 600,000 pounds of aqua ammonia solution within the secondary containment structure. The distance to the endpoint (point of dispersion to 200 ppm) is 4.70 miles. The alternative release scenario, based on the PHA scenarios (or the most likely potential incident) is a release of 10,000 pounds of aqu a ammonia solution from a storage tank modeled with an increased wind speed and "D" Stability modeling parameters. The distance to the endpoint (point of dispersion to 200 ppm) is 0.19 miles. 4. Accidental Release Prevention Program Anhydrous Ammonia and Aqua Ammonia: The Facility has implemented the provisions of the "Safety Requirements for Storage and Handling of Anhydrous Ammonia, K-61.1", published by the American National Standards Institute, Inc.; California Code of Regulations, Title 8, Subchapter 1, "Unfired Pressure Vessel Safety Orders"; and the standards of the U.S. Occupational Safety and Health Administration (OSHA), 29 CFR 1910.111, "Storage and Handling of Anhydrous Ammonia." 5. Five-year Accident History a. There have been no accidental releases or near misses of anhydrous ammonia or aqua ammonia in the past five years that: 1. Have caused any deaths, injuries, or significant property damage at the facility; nor 2. Have resulted in off-site deaths, injuries , evacuations, sheltering in place, property damage, or environmental damage. 6. The Emergency Response Program The facility's emergency response program was written in accordance with the following regulations: OSHA 29 CFR 1910.38; OSHA 29 CFR 1910.120; and Section 25503, Division 6.95 of the California Health and Safety Code 7. Planned Changes to Improve Safety Safety improvement is an on-going process at the facility. Periodic evaluations are performed to assess the maintenance of safe conditions. Specific planned changes to the anhydrous ammonia, and aqua ammonia processes at the facility are listed in the Facility PHAs. In summary, planned changes address the review and development of Standard Operating Procedures for regulated onsite processes. |