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M M MASTELLER & MO — CIVIL ENGINEERS INC. EXHIBIT A 165527 th St Ste. 2, Vero Beach, FL 32960 (772) 567-5300 It is understood Indian River County desires the design of the 45th Street Roadway Improvements project to be modified to reduce the size of the stormwater conveyance piping to replace the existing Indian River Farms Water Control District's A -7-E Sub -lateral from a 58" x 91" (72" Equivalent) to a 48" x 76" (60" Equivalent). In conjunction with the change to the culvert size, the County desires that the roadway cross-section be designed to be crowned rather than the culvert designed sloped section from south to north. In order to confirm these decisions will result in a reduction of requirements for purchase of right-of-way, we shall perform the following scope of services: Task N — Conceptual Design Evaluation: In order to assist the County with regard to adopting the above-described conceptual design change, we shall develop a comparative analysis to determine if the resulting design will significantly reduce the County's requirement for purchase of right-of-way along the north side of 45th Street. As stated above, the conceptual design modifications to be considered are: 1. The use of a 48" x 76" (60" equivalent) culvert system rather than a 58" x 91" (72" equivalent) culvert system; and 2. The use of a crowned roadway section rather than south to north cross-section. In order.to determine the net effect of the above-described conceptual design changes to reduce , the right-of-way purchase, we shall prepare a conceptual design that will include the following Steps: A. Depiction of a 48" x 76" culvert system with a minimum slope of 0.025% following the alignment depicted on the current design. B. Preparation of a Typical Crowned Cross-section with Type F Curb on both sides of the street using the same paving widths as in the current design. The Typical section will be submitted for County approval prior to proceeding to Step C. C. Preparation of a Conceptual Roadway Stormwater Collection System depicting inlets at both the north and south curb line along the crowned 45th Street corridor. D. Preparation of a Conceptual Drainage Plan Modification to depict the manner in which runoff from private lands north and south of the 45th Street corridor will flow to the 48" x 76" culvert system. E. Development of a Conceptual Centerline Profile with high points and low points and slopes not less than 0.35%. F. Creation of Conceptual Cross-sections at high points. It is intended the above-described Conceptual Cross-sections design be superimposed over the existing Cross-sections so as to reveal whether or not the conceptual design changes will result in the reduction of needs for right-of-way purchase. Page 1 of 2 d