MSHA - Code of Federal Regulations - 30 CFR 56.4104
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MSHA - Title 30 CFR
30 CFR § 56.4104
Combustible waste.

(a) Waste materials, including liquids, shall not accumulate in quantities that could create a fire hazard.

(b) Until disposed of properly, waste or rags containing flammable or combustible liquids that could create a fire hazard shall be placed in covered metal containers or other equivalent containers with flame containment characteristics.