As previously noted, the process of determining abatement feasibility/reasonableness for a special land use is divided into two parts. The first is to assess feasibility of abatement for the site, the second part of the analysis is abatement reasonableness. This methodology uses a worksheet/matrix process whereby the preparer can systematically perform a step by step analysis of the special land use site. Using a simple flowchart (Feasibility Flowchart) the preparer determines whether the abatement is required or is possible (feasibility). If the abatement is feasible, the preparer should complete the Reasonableness Matrix to determine reasonability. The Reasonableness Matrix leads the preparer through a list of questions and calculations that establish if abatement is reasonable based on criteria such as cost and usage of the site. The Feasibility Flowchart/Reasonableness Matrix are designed to be completed with a minimum of effort and required information.
The Feasibility Flowchart follows the criteria for feasibility already established for Type I projects. It is assumed that feasibility issues such as safety, constructability, drainage and other items from Part 2, Chapter 17 of the FDOT Project Development and Environment Manual are addressed separately. The Feasibility Flowchart also contains additional items such as the Federal Highway Administration NAC that if not exceeded are considered "FATAL" which immediately ends the Feasibility/Reasonableness process. The Feasibility Flowchart also instructs the preparer to end the analysis and deem abatement infeasible if the responses to these questions do not follow previously established FDOT guidelines.
The second part of the site assessment is to determine reasonableness of providing abatement at the site. Reasonableness is the key to the whole process for special land uses. The Reasonableness Matrix assesses site specific criteria to determine if abatement is reasonable at the special land use site. The Reasonableness Matrix leads the preparer through a calculation of an "abatement cost factor" which is based on dimensions of the proposed barrier and usage of the site. This calculated special land use "cost" is evaluated along with other items to decide if abatement at the site is reasonable.
The Feasibility Flowchart and Reasonableness Matrix are shown in Figures 2a and 2b.
