You will want you contingency plan to detail how the company will continue to function should there be an incident that causes disruption. The below isn't necessarily specific to scenarios and not all inclusive of a full contingency plan but these are some things that should also be considered. I feel that once you have these things taken care of, you can easily access each area to develop your specific plans. To add, we only have one plan with different areas assessed that we reference.
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Create a list of items that your facility relies on, including ingredients, packaging materials, equipment, and utilities (water, electricity, gas). Identify critical resources that are essential for production. Be sure to include building details should you need to find another location to process depending on the incident. This can include an alternate site you already have or someone in the same line of business that you could potentially reroute your business through or use their building should that be part of your plan.
Have alternative suppliers and logistics partners in case your primary ones are unable to deliver. Ensure that these alternatives meet your food safety and quality standards. You may already have this part taken care of as part of your supplier programs.
For critical equipment, have backup equipment or arrangements in place in case of breakdowns. Make sure there is a list of equipment suppliers that you would be able to access should the immediate need be necessary. Have specs of your equipment of what is critical. So it's quicker to source.
Outline your specific food safety protocols for various emergency scenarios. This might include procedures for handling contaminated products, sanitation during disruptions, and disposal guidelines which include product destruction & certs as well as packaging destruction.
Also include electronic data. Make sure there is some sort of of site back up system in place and also have employee contact info on hand as well.
Once you have some of those areas covered it will help you create a pathway to continuing operations after an incident. From there you can zoom in on your individual plans based on incident type and damage level. You can consider making a damage level/type assessment that includes everything from partial building destruction, to complete building destruction and the different measures you'd take. For example, in a situation where maybe you'd cordon off certain areas and only process or pack in other areas or whatever your site decides on.
Also include electronic data. Make sure there is some sort of of site back up system in place.
I'm sure others can provide more details on what they do but hopefully this will give you an idea and starting point.