5 C.F.R. § 6401.102
(a) The following employees are prohibited from holding the types of financial interests described in this section:
(4) Employees who perform functions or duties under the Surface Mining Control and Reclamation Act (such as reviewing Environmental Impact Statements of the Office of Surface Mining in the Department of Interior) are prohibited by 30 U.S.C. 1211(f) from holding direct or indirect interests in underground or surface coal mining operations.
(i) Implementing regulations of the Office of Surface Mining at 30 CFR 706.3 define the terms “direct financial interest” and “indirect financial interest” as follows:
(5) Members of the Interagency Testing Committee established under section 4(e) of the Toxic Substances Control Act (15 U.S.C. 2603(e)) are prohibited thereunder from holding any stocks or bonds, or having any substantial pecuniary interest, in any person engaged in the manufacture, processing, or distribution in commerce of any substance or mixture subject to any requirement of the Act or any rule or order issued under the Act and, for a period of twelve months after their committee service has ceased, are prohibited thereunder from accepting employment or compensation from any person subject to any requirement of the Act or to any rule or order issued under the Act.