; and (2) include a proposal describing the modifications sought to the covered project. (c) Intervening parties (1) Requirements Any person that submitted a public comment on the covered active management project subject to arbitration may intervene in the arbitration— (A) by endorsing the covered project or the modification proposal submitted under subsection (b)(2); or (B) by submitting a proposal to further modify the covered project. (2) Deadline for submission A request to intervene in an arbitration must be submitted not later than the date that is 30 days after the date on which the demand for arbitration was filed. (3) Multiple parties Multiple objectors or intervening parties may submit a joint proposal so long as each objector or intervening party meets the eligibility requirements of subsection (a)(2) or paragraph (1), whichever applies. (d) Appointment of arbitrator The United States District Court in the district in which the covered active management project is located shall appoint the arbitrator to conduct the arbitration proceedings in accordance with this section and chapter 1 of title 9, United States Code. (e) Selection of proposals (1) In general The arbitrator appointed under subsection (d)— (A) may not modify any of the proposals submitted with the demand for arbitration or a request to intervene; and (B) shall select to be conducted— (i) a proposal submitted by an objector or an intervening party; or (ii) the covered active management project, as approved by the Secretary. (2) Selection criteria An arbitrator shall select the proposal that best meets the purpose and needs described in the environmental analysis conducted for the covered project. (f) Effect of decision The decision of an arbitrator with respect to the covered active management project— (1) shall not be considered a major Federal action; (2) shall be binding