Partial waiver of parking requirement. Where the Board of Trustees determines, in connection with its review of a site development plan for the RD District, that less than the required number of parking spaces will satisfy the intent of this chapter because of variations in the probable time of maximum use by joint users, use of attendant parking or for any other reasons, the Board may waive all or a portion of the improvement, but not more than 1/3 of the total number of required parking spaces normally required. In all cases, it is the applicant's responsibility to demonstrate that a variation from the requirements is justified for the reasons stated above.