; or (ii) the modification proposal submitted under subparagraph (B); or (B) by submitting a proposal to further modify the forest management activity. (2) Deadline for submission With respect to an objection or protest that is designated for arbitration under this subsection (a), a request to intervene in an arbitration must be submitted not later than the date that is 30 days after the date on which such objection or protest was designated for arbitration. (3) Multiple parties Multiple intervening parties may submit a joint proposal so long as each intervening party meets the eligibility requirements of paragraph (1). (c) Appointment of arbitrator (1) Appointment The Secretary of Agriculture and the Secretary of the Interior shall jointly develop and publish a list of not fewer than 20 individuals eligible to serve as arbitrators for the pilot programs under this section. (2) Qualifications In order to be eligible to serve as an arbitrator under this subsection, an individual shall be, on the date of the appointment of such arbitrator, certified by the American Arbitration Association. (3) Selection of arbitrator (A) In general For each arbitration commenced under this section, the Secretary concerned and each applicable objector or protestor shall agree, not later than 14 days after the agreement process is initiated, on a mutually acceptable arbitrator from the list published under subsection. (B) Appointment after 14-days In the case of an agreement with respect to a mutually acceptable arbitrator not being reached within the 14-day limit described in subparagraph (A), the Secretary concerned shall appoint an arbitrator from the list published under this subsection. (d) Selection of proposals (1) In general The arbitrator appointed under subsection (c)— (A) may not modify any of the proposals submitted with the objection, protest, or request to intervene; and (B) shall select to be conducted— (i) the forest management activity, as approved by the Secretary