Current Regulatory Framework - Coal Waste Impoundments: Risks, Responses, and Alternatives - page 22

FIGURE 2.1 Coal Mine Safety and Health Administration district offices.
Modified from data provided by MSHA.
underground workings. The review procedures provided to this committee
did not indicate any independent determination of the depth and extent of
underground workings.
Inspection Requirements
To be approved, a construction plan must contain a plan for construction
surveillance, maintenance, and repair of the impounding structure; monitoring
of the disposal process is mandatory (30 C.F.R. § 77.216-2 (a)(15)).
Compaction of the material is the primary concern, including the method of
emplacing the material, its size and consistency, and thickness of the layers.
This specific monitoring of construction is unique to each impoundment and
detailed in the approved plan. All MSHA-class water, sediment, and slurry
impoundments must be inspected at least once every