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Bowman CONSULTING Exhibit C Amendment No.3 June 11, 2019 Mr. William Johnson, P.E. Roadway Production Engineer Indian River County 1801 27th Street — Building A Vero Beach, FL 32960 RE: IRC 1325 — 58th Avenue FDR, Proposal for Additional Engineering Services, Left Trun Widening Dear Mr. Johnson: On May 24, 2019 the County requested that Consultants provide a provide proposal to widen 58th Avenue between 77th Street and 81st Street to allow for bi-direction center turning movements outside of the existing left turn lanes envelope. In phone discussions with you, we determined that the work will include starting at approximately the first entrance to the WTP.and extend north to the intersection of 81st Street. North of the intersection will remain the same so as not to encroach into the area of the canal crossing. This proposal covers the additional work that Bowman and Lassiter Transportation Group will perform. No other subconsultants are involved with this request. We have evaluated the issues associated with the proposed widening and the following is a summary of our findings. Road widening will take place between 546+69 to 565+57. We see all the road widening taking place on the easterly side due to the constraints on the west side. We propose to keep the crown of road where it is currently located as it falls on a lane line and the extended slope will reduce the grade difference to existing. With the widening the ditch will need to be relocated further to the east. At some locations the ditch will reduce the cover over existing utilities and cause the utilities to fall within the limits of the ditch. Valves on larger lines will be exposed. One power pole appears to be within the clear zone that will need to be relocated, and this will require additional R/W at the park or an easement. This proposal assumes that the County will obtain any additional R/W or easements. Driveways serving the park will need to be redesigned. Trees in the area of the park will need to be removed. We will need to relocate the proposed fiber optic line along this corridor. This will also require updating the SWPPP sheets. This proposal does not include a drainage permit based on the other work at 69th Street not requiring one. The work will involve modifying the model and regenerating the cross-sections to provide the data on the work associated with the widening. The redesigns discussed above will also need to be accomplished. We will also need to update the quantities, bid schedule and estimate. FDR emulsion 4450 W. Eau Gallie Blvd., Suite 232, Melbourne, FL 32934