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Patrick S.Walther,P.E. March 17,2016 Page 2 Subsequent to completion of the plan for that installation, several factors have occurred requiring revisions to the plan. Those factors include the redesign of the intersection improvements such as elimination of grade changes within the limits of the intersection. The need for additional new mast arms has also arisen due to coordination with FDOT and revised design standards. Information to be provided by Carter Associates for this supplemental agreement includes those items listed in the original agreement,dated March 11,2015. TASK 2—STRUCTURAL SUPPORT ANALYSIS Coordination with.FDOT on the original traffic signal design scope of work resulted in the need to consider the addition of back plates to the remaining existing signal heads at the US-1/415' Street i intersection. Structural analysis is being required for the signals that are not otherwise affected by the i intersection improvements and were not considered in the original project scope. McMahon will complete the structural support analysis using the FDOT"Mastarm"software. If the existing structure can accommodate the addition of back plates, the design will reflect the back plates. If the existing signal supports cannot accorrunodate the back plates,the analysis will be provided to FDOT;however, the design will not include the addition of back plates. The services to be performed pursuant to this agreement are strictly limited to those expressly set forth herein. FEE The lump sum fee for the above-mentioned tasks are as follows: Task 1-Mast arm design revisions at US-1 $3,740.00 Task 2—Structural support analysis $2,180.00 Total fee for Supplemental Agreement No.1 $5,920.00 If additional services are required that exceed those identified in the original Scope, of Work or Supplemental Agreement Number 1, a second supplemental agreement will be submitted to the client for review and approval prior to the commencement of any additional tasks. Additional services will commence upon written authorization to proceed by the client. SCHEDULE We are prepared to initiate work on the project upon receipt of written authorization to proceed. McMahon will use its best efforts to complete this work in accordance with the client's meeting schedule.