R2020-185 Resolution to Approve Preliminary Engineering Services Agreement and Appropriate Motor Fuel Tax Funds for the Garfield Avenue Bridge over 22nd Street, SN 058-6001 City Project 2020-22

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Exhibit A 4. Bridge Deck Repair: The existing bridge deck is structurally adequate, but deck repairs are required and an overlay may be necessary to improve the rideability and maintain the integrity of the deck. Additional repairs to the superstructure and/or substructure may be included with this work. This is considered a special type of "bridge rehabilitation". 5. Bridge to Remain in Place. The bridge is structurally sound, has adequate load capacity and meets the minimum width/clearance/geometric criteria to remain in place without work. 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 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 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, 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 structural capacity factors. In these instances the reason for not completing an economic analysis will be well documented in the Bridge Condition Report. A-4 Rev 0—12/10/2020