R2017-34 Contract with Browning Chapman, LLC for Parking Garages B & C CP 2015-03

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In December 2014, an inspection of Parking Garage C by City staff noted severe deterioration in several structural steel members. Structural engineers with Chastain and Associates, LLC reviewed the deterioration and recommended repairs at two locations. Photographs of the damage and repair are included in Appendix A, see photographs 1 - 3. Chastain also recommended that a thorough structural review be conducted in the parking garages. In July 2015,the Public Works Department retained the services of Carl Walker Inc., a well known and highly respected national engineering firm specializing in parking garage construction and restoration. Carl Walker was originally retained by the City in 2009 to complete a condition assessment of Parking Garages B and C and they then designed improvements to the parking garages that were completed in 2012. Carl Walker completed a Parking Garage Condition Assessment Report for Garages B and C in October, 2015. This information has been provided previously to the City Council. The report noted 5 beam ends that required immediate shoring which was completed by Pubic Works personnel (see photographs 4 and 5). The 2015 report recommended that$300,000 in repairs be made to the parking garages in 2016. The bids in 2016 were significantly higher than expected and were allowed to expire due to a lack of available funding. The recommended improvement table (Table 1 below) originally prepared by Carl Walker in 2015 has been updated with current dates and more accurate project estimates: Table 1 Recommended Phased Repairs Description 2017 2018-2020 2021-2023 Garage B: Estimated Project Totals (2017 $319,000 $999,000 $822,600 Dollars) Garage C: Estimated Project Totals (2017 $266,200 $527,000 $442,800 Dollars) Totals $585,200 $1,526,000 $1,265,400 The proposal for the 2017 parking garage improvement work includes full depth floor repairs,beam and joist repairs, structural steel repairs, and cleaning and painting of rusted steel. Future repairs are focused on repairing brick walls, recoating the decks with waterproof membrane to keep water from further deteriorating the concrete and steel of the structure along with additional floor and beam repairs. As noted on Table 1, significant investment is required in the City's parking structures in order to manage ongoing structural deterioration. No Future Funding Allocation To assure the long term health of the City's parking garages, it is important that ongoing maintenance needs are funded in a timely manner. Parking garages suffer from the same deterioration forces as those acting on pavements and bridges. During the winter, road salt is carried into the garages by cars and soaks into the decks causing increased steel corrosion and concrete deterioration. — 2 —