(a) Part 817 of this chapter, Permanent Program Performance Standards—Underground Mining Activities, applies to any person who conducts underground mining activities, except § 817.116(a)(1) of this chapter regarding revegetation success standards, for which paragraph (b) of this section substitutes.

(b) Standards for success shall be those identified at § 817.116(a)(2) and (b) of this chapter. Statistically valid sampling techniques for measuring success shall be included in the mining and reclamation plan and approved by the regulatory authority.