Anything to the contrary notwithstanding, the Borough shall have the right to increase the level of maximum gallonage allocated in the event that an applicant commits to the payment of a substantial portion of the costs for a sewage waste treatment project in a form and manner acceptable to the Borough. The form acceptable to the Borough shall provide a satisfactory financial commitment by the applicant to the project which shall be enforceable by the Borough. The Borough in such case shall allow the applicant to utilize that portion of the increased gallonage at the time that substantial payment by the applicant has been made toward the construction of the additional treatment plant facilities by the Borough.