30 C.F.R. § 842.5
As used in this part, the following terms have the specified meanings:
Citizen complaint means any information received from any person notifying the Office of Surface Mining Reclamation and Enforcement (OSMRE) of a possible violation of the Act, this chapter, the applicable State regulatory program, or any condition of a permit or an exploration approval. This information must be provided in writing (or orally, followed up in writing).
Ten-day notice means a communication mechanism that OSMRE uses, in non-imminent harm situations, to notify a State regulatory authority under § 842.11(b)(l)(ii)(B) (1) and § 843.12(a)(2) of this chapter when an OSMRE authorized representative has reason to believe that any permittee and/or operator is in violation of the Act, this chapter, the applicable State regulatory program, or any condition of a permit or an exploration approval or when, on the basis of a Federal inspection, OSMRE determines that a person is in violation of the Act, this chapter, the applicable State regulatory program, or any condition of a permit or an exploration approval and OSMRE has not issued a previous ten-day notice for the same violation.
30 C.F.R. §842.5