The granting or approval of a conditional use by the Board of Supervisors shall be valid only for the property specified in the petition. Alterations or changes to the use or building authorized by the Board of Supervisors shall require reapplication to the Board. If a conditional use is granted, the necessary permit shall be secured within two years after the date when such approval is finally granted, provided that if the necessary permit is not secured within the aforesaid time period due to reasons beyond the applicant's control (such as ongoing appeals), failure of governmental bodies other than West Donegal Township to issue permits which are a condition precedent to the issuance of the permit, or the failure of the Township or its agencies to proceed diligently and in good faith in the consideration of the permit application, the two-year period shall not apply. If the conditional use has not been implemented within two years of the date of the Board of Supervisors' approval, said approval shall expire and become null and void.