Final answer:
Combustible waste and vegetation should be kept at a minimum of 20 feet from compressed gas containers and systems in outdoor storage to reduce the risk of fire and explosion.
Step-by-step explanation:
According to standard safety guidelines, combustible waste and vegetation should be kept at a minimum distance of 20 feet from compressed gas containers and systems in outdoor storage. This is to minimize the risk of fire and explosion due to potential ignition of the combustible materials.