The board of the merger district may, by resolution, reject or approve the petition as presented, or it may modify the terms and conditions of the proposed merger, and shall transmit the petition, together with a copy of its resolution to the merging district.

If the petition is approved as presented or as modified, the board of the merging district shall send an elector-signed petition, if there is one, to the auditor or auditors of the county or counties in which the merging district is located, who shall within thirty days examine the signatures and certify to the sufficiency or insufficiency of the signatures. If the merging district is located in more than one county, the auditor of the county within which the largest portion of the merging district is located shall be the lead auditor. Each other auditor shall certify to the lead auditor the number of valid signatures and the number of registered voters of the merging district who reside in the county. The lead auditor shall certify as to the sufficiency or insufficiency of the signatures. No signatures may be withdrawn from the petition after the filing. A certificate of sufficiency shall be provided to the board of the merging district, which shall adopt a resolution requesting the county auditor or auditors to call a special election, as provided in RCW 29A.04.330, for the purpose of presenting the question of merging the districts to the voters of the merging district.

If there is no elector-signed petition, the merging district board shall adopt a resolution requesting the county auditor or auditors to call a special election in the merging district, as specified under RCW 29A.04.330, for the purpose of presenting the question of the merger to the electors.