MSHA - Code of Federal Regulations - 30 CFR 57.4104
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MSHA - Title 30 CFR
30 CFR § 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.