(1) The individual assessment shall be prepared by a qualified engineer or engineering firm.

(2) The study shall be signed by the engineer submitting the assessment and shall include sufficient information and analysis to support the claim that the proposed development will have less impact on the need for drainage improvements than indicated by the Drainage Impact Fee Schedule. In the event that the proposed development may discharge runoff directly into state or county systems, the development may be exempt from the payment of drainage impact fees, pursuant to the provisions of Section 18-4-102, "Use of State or County Flood Control Facilities."*

(3) The Impact Fee Administrator shall determine the fee based on the review of the independent assessment and the guidelines described in the preceding Section 8-2-101, "Drainage Impact Fee Schedule."