Any applicant desiring relief, waiver, or exemption from any aspect or requirement of this chapter may request such from the Board, provided that the relief or exemption is contained in the original application for either a SUP or in the case of an existing or previously granted permit, a request for modification of its tower and/or facilities. Such relief may be temporary or permanent, partial or complete. The burden of proving the need for the requested relief, waiver or exemption is solely on the applicant to prove. The applicant shall bear all costs of the Board and the City in considering the request and the relief, waiver, or exemption. No such relief or exemption shall be approved unless the applicant demonstrates by clear and convincing evidence that, if granted, the relief, waiver, or exemption will have no significant effect on the health, safety, and welfare of the City, its residents, and other service providers.