R2016-116 AUTHORIZING A PROFESSIONAL ENGINEERING SERVICES AGREEMENT WITH AECOM TECHNICAL SERVICES, INC.

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Exhibit A The bridge analysis process requires evaluation of the various aspects and components of the bridge to determine if they are suitable for reuse or repair. Once the analysis is complete, the results will be reviewed in whole and the appropriate scope of work will be selected. The evaluations required for a typical bridge during the analysis process generally include: 1. Geometric & Hydraulic Capacity 2. Deck 3. Superstructure (other than deck) 4. Substructure 5. Miscellaneous Checks 6. Stage Construction Feasibility 7. Economics The scope of work and fee estimate does not include a hydraulic capacity analysis, a detailed structural analysis or the coring of the superstructures. If it is determined that these tasks need to be perFormed, AECOM will coordinate with the City of Decatur. Once the evaluations of the various geometric, hydraulic, physical and structural aspects of the structure are finished, an economic evaluation will be completed. The economic evaluation will estimate the initial construction cost for the various scope of work alternatives being considered for the project. The estimates will reflect the findings of the other evaluations completed regarding need for repair, rehabilitation and reconstruction of any structure elements being considered for reuse. To be considered for reuse an element must be in good or economically repairable condition with adequate structural capacity. The element must also have sufficient remaining service life after the project is complete to last as long as the other major elements of the structure without requiring an unreasonable amount of maintenance. Aesthetic appearance may also be considered when warranted. In some instances an economic analysis regarding reuse of existing structure components may not be necessary. Examples of these cases are structures whose physical condition is obviously beyond economical repair, a major roadway geometry change causing the structure to be relocated or unacceptable hydraulic or structural capacity factors. In these instances the reason for not completing an economic analysis will be well documented in the Bridge Condition Report. Cost estimates will be prepared based on initial construction cost to complete the work using itemized costs. The itemized cost estimates will generally include all significant pay items necessary to complete the proposed work to include the following: • Structure pay items to include structure repairs • Staging &Traffic Control related to the structure • Profile revisions necessary for structure related issues such as clearances � A-5 I Rev 0—9/16/16