In the event that the municipality's professional consultant and
applicant cannot agree upon the arbitrator to be appointed within
20 days of the request for appointment of an arbitrator, then, upon
application of either party, the President Judge of the Court of Common
Pleas of the judicial district in which the municipality is located
(or if at the time there be no President Judge, then the senior active
judge then sitting) shall appoint such arbitrator, who, in that case,
shall be neither the municipality's professional consultant nor any
professional consultant who has been retained by, or performed services
for, the municipality or the applicant within the preceding five years.