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ADDENDUM 413 TO CONTRACT DATED JANUARY 21 , 1997 BETWEEN INDIAN RIVER COUNTY AND MASTELLER & MOLER, INC. FOR CR 512 PAVING & DRAINAGE IMPROVEMENTS INDIAN RIVER COUNTY PROJECT #9611 COUNTY ROUTE 512 CORRIDOR IMPROVEMENTS ROSELAND ROAD TO I-95 INDIAN RIVER COUNTY, FL As result of discussion with and comments from Indian River County Staff during the finalization of the construction plans for Phase IV of the CR-512 Roadway Improvements, it has been noted that work not included in the original contract or subsequent addendums must be performed in order to ensure a successful project. The anticipated additional work shall include turn lanes, the redesign of the 101st Avenue/CR-512 intersection, the evaluation of existing drainage structures on the Sebastian Middle School site, an updated environmental survey of the Phase IV alignment, the design and permitting of a sidewalk extension along the north side of CR-512, and the design of a north-bound left tum lane on 101st Avenue at CR-512. In order that the project design may be modified and permits obtained, we will perform the following "Additional Services": Task A — Phase IV Construction Plan Modifications We will add the following design elements to the construction plans as requested by the County: 1 . Additional Rip_ht-Turn Lanes: In accordance with the County' s request, we will design right turn lanes at the following locations: a. 101st Avenue (east-bound) b. 104th Avenue (west-bound) c. 106th Avenue (west-bound) d. 108th Avenue (west-bound & east-bound) 2. Redesign of 101st Avenue Intersection: The County has proposed to realign 102"d Avenue north of CR-512 to meet the intersection of 101 " Avenue and CR-512. As such, the Phase IV construction plans will be revised to illustrate a plateau intersection at that location with a tumout to the north for the future connection of 102"d Avenue. 3 . Traffic Signal Interconnection: In order to extend traffic signal interconnect capability along the Phase IV portion of CR-512 we will incorporate the design of double 2-inch conduit with related pull boxes into the Phase IV construction plans. The design of the traffic interconnect conduit will be coordinated with the County' s Traffic Engineering department.