The variance hearing shall be conducted before the City Administrator not less than twenty business days, excluding Saturdays, Sundays, and City holidays, from the proposed date for the variance. The sole issue before the City Administrator shall be whether the grant of the variance shall create an adverse impact on the health, safety, and welfare of persons or property affected. The applicant for a variance shall carry the burden of establishing that an adverse impact shall not be created by the grant of a variance. In the event the City Administrator determines there will be an adverse impact, then the variance shall not be granted and the reasons therefor shall be in writing and delivered to the applicant and filed with the City. In the event the City Administrator determines that an adverse impact will not be created, then the variance shall be granted subject to those limitations set out by the City Administrator. The proceedings at the administrative hearing shall be tape recorded by the City Administrator. Such tape recording shall serve as the official record of the administrative hearing for appeal purposes. The City Administrator shall retain all such tape recordings until the time for filing a notice of appeal has expired. Should a notice of appeal be timely filed, the City Administrator shall retain the tape-recorded record of the administrative hearing until the appeal has been acted upon by the Council.