Discovery is not allowed in a proceeding under this chapter, except by agreement with the other party or by order of the arbitrator upon a showing of good cause. Any discovery will be completed no later than 14 days before the opening of the arbitration hearing on the merits, unless otherwise ordered by the arbitrator. Discovery should not be filed with SOAH or the arbitrator unless there is a related dispute which must be resolved by the arbitrator. No more than four hours of deposition testimony may be taken by either party, unless otherwise ordered by the arbitrator.