D6: Northern Walnut Creek Trail (Phase 1A) Presentation — original pdf

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CITY OF AUSTIN Northern Walnut Creek Trail Phase 1A at Balcones District Park Parks & Recreation Board Update • Trail Design and Citizen Communication Agenda • Project History • Site Drainage • Warranty Items • Maintenance • Project Closeout • Questions 1 Project History 2002 Trail planning initiated 2010 Construction of Phase 1 initiated 2011-2013 Project on hold 2013 Phase 1A broken out of Phase 1 2014 Water Utility project combined with Phase 1A 2017 Phase 1 trail complete Jan. 2018 Water Utility trail section complete Nov. 2018 Phase 1A complete 2 Northern Walnut Creek Trail Phase 1 Balcones District Park Walnut Creek Metropolitan Park Gracywoods Neighborhood Park 3 Project Map Phase 1A Phase 1A – West Phase 1A – East combined with Water Utility project 4 Trail Design and Citizen Communication • The design of the Phase 1A trail includes a compacted gravel shoulder. This design was in response to community and maintenance staff feedback. • Staff consulted with the Milwood Neighborhood on the design of the Phase 1A trail section during and outside of public meetings. • City staff met with representatives of the Milwood Neighborhood on site on multiple occasions during the project to discuss concerns. • Staff was responsive to citizen communications throughout the project. 5 Site Drainage Drainage and Erosion City of Austin | Public Works Department 6 Warranty Items Cracked Concrete Trees in Stress 7 Maintenance Trail Shoulder Erosion • Two change orders were added to the construction contract to address site erosion and the ramp at Scribe Drive. The 1ft wide compacted gravel shoulder is part of the permitted trail design, and not part of the landscaping of the trail. • Native vegetation is slow to establish but has begun to fill in after a long hot summer. As vegetation increases, erosion and drainage issues will naturally decrease. The current urban trail detail showing topsoil over sub-base was adopted in December 2018, after the trail had been permitted and construction began. • • Tree Health • This is the first urban trail project where trees where planted along the trail as part of the project. • Watering and survival of the trees during the project is the responsibility of the contractor. Tree maintenance and survival are covered under the one year warranty and become the responsibility of the Owner at the end of the warranty phase. Ensuring water access in greenbelts is a challenge especially near creeks and in flood plains. • 8 Project Closeout • Gravel shoulder removal in select areas removed and replaced with top soil and native seeding where significant scouring was occurring. COMPLETE • Ramp at Scribe Drive re-design and install ramp to prevent water from Scribe Drive entering the park. COMPLETE 9 Project Closeout • Pavement cracking– substantial cracks identified in panels of the trail that could pose an ADA compliance concern have been replaced. Minor cracking in the pavement has been caulked per Street and Bridge normal maintenance procedures. COMPLETE 10 Project Closeout • Bridge/Railing – Separation between the trail paving, retaining walls and railing were identified as being caused by soil conditions found in active floodways. These separations will be filled and sealed. The railing will be repaired as needed. COMPLETE 11 Project Closeout • Silt Fence – The environmental inspector approved removal of all of the silt fence except the staging area. • Environmental compliance – Project team has met with Development Services representatives and have confirmed all concerns have been addressed. • Trees – Forty-one trees in Phase 1A West have been replaced under the contract warranty. Staff is working on options to provide supplemental watering to the trees. Multiple trees replaced under warranty in Phase 1A East have died. The project team is working to determine how to address the loss of these trees along with trees planted in Phase 1A West. The project team will continue to monitor trail conditions as part of the urban trail regional systems maintenance and operations. City maintenance staff will address issues as they are identified. 12 CITY OF AUSTIN Questions? Ana Seivert Urban Trails Project Coordinator Ana.Seivert@austintexas.gov 512-974-2858 D’Anne Williams Parks and Trails Project Manager Danne.Williams@austintexas.gov 512-974-9456