Section 57.4104 - Combustible waste(a) Waste materials, including liquids, shall not accumulate in quantities that could create a fire hazard.(b) Waste or rags containing flammable or combustible liquids that could create a fire hazard shall be placed in the following containers until disposed of properly: (1) Underground-covered metal containers.(2) On the surface-covered metal containers or equivalent containers with flame containment characteristics.