A Containment Boom and Standoff has three embodiments, a Dual Plank Assembly, a Dual Pole Assembly, and a Dual Flotation/Water Ballast Assembly. The Dual Plank Assembly comprises buoyant planks covered with impermeable material with sealed poles inside the planks and mechanical connectors on the ends. The Dual Flotation/Water Ballast Assembly comprises a pair of dual chamber assemblies with an upper chamber for flotation material and lower chamber for water ballast. Both assemblies have sufficient buoyancy to float high enough in water to block the passage of a floating oil spill over the top and low enough to prevent oil from going underneath. Structure positioning magnets attach the assemblies to an aquatic structure to provide a localized containment boom that is efficient to use as a containment boom and/or a standoff. The Dual Pole Assembly comprises sealed poles with magnetic positioners to stand off boom from aquatic structure.