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TRANSPORTATION ENGINEERS & PLANNERS March 17, 2016 VIA E-MAIL Mr. Patrick S. Walther, P.E. Carter Associates, Inc 170821st Street Vero Beach, Florida 32960 McMAHON ASSOCIATES, INC. 2090 Palm Beach Lakes Blvd, Suite 400 1 West Palm Beach, FL 33409 p 561-840-8650 1 f 561-840-8590 mcmahonassociates.com REi US -1 at 4151 Street Signal Design Plan — Supplemental Agreement No.1 McMahon Project No. N15067.OP Dear Pat: PRINCIPALS Joseph W. McMahon, P.E. Joseph, J. DeSantls, P.E., PTOE John S. OePalma William T. Steffens Casey A. Moore, P.E. Gary R. McNaughton, P.E., PTOE ASSOCIATES John J. Mitchell, P.E. Christopher J. Williams, P.E. R. Trent Ebersole, P.E. Matthew M. Kozsuch, P.E. Maureen Chlebek, P.E., PTOE McMahon Associates, Inc (McMahon) is pleased to provide this supplemental agreement for the US -1 at 41st -Street Signal Design project, in Vero Beach, Florida. This proposal is for additional services related to a design modification to the traffic signal at US -1. This agreement is based on the assumption that all project baseline geometry, existing and proposed right-of-way, topographic, gebtechnical, and sub -surface utility exploration" (SUE) information necessary to complete the design will be provided by Carter Associates, Inc. In order to provide the proper design for the traffic signal_ supports, subsurface soil information must be provided by Carter Associates, Inc. Soil borings will be obtained in the field by a Geotechnical Engineer, at all corners of the study intersection. The geotechnical information will be analyzed and the project Geotechnical Engineer will provide a standard report. This information will be t;tilized for the design of traffic signal mast arm supports. If right-of-way or other project constraints dictate that a proposed mast arm base must be placed in the vicinity of an existing underground utility, then Carter Associates, Inc. will provide the sub -surface utility exploration (soft dig) necessary to identify the utility conflict. If additional right-of-way or easements are required for the proposed signal equipment locations, Carter Associates, Inc. will obtain the necessary agreements. The Scope of Work includes the following tasks: SCOPE OF WORK TASK 1— MAST ARM DESIGN REVISIONS AT US -1 The original agreement scope of work for the design of a traffic signal at US -1141& Street included the installation of one new mast arm due to conflicts with the proposed travel lane modifications. Corporate Headquarters: Fort Washington, Pennsylvania Serving the East Coast from 13 offices throughout New England, the Mid -Atlantic, and Florida 82