Within 45 days after the conclusion of the hearing, the Board shall render a written decision on the application and shall inform the applicant of it personally or by mail no later than the day after the date of the decision. When the application is contested or denied, the decision shall be accompanied by findings of fact and conclusions based on them, together with reasons for the conclusions. Conclusions based on any provisions of this Part, any other Township ordinance or regulation, or the State Planning Code, 53 P.S. § 10101 et seq., shall contain a reference to the provision relied on and the reasons why the conclusion is deemed appropriate in the light of the facts found.