City Council Minutes 2017 08 01 - Laserfiche WebLink

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City Council Meeting Minutes August 1, 2017 Page 6 of 9 Boulder Road to surrounding neighborhoods and trails Fowlkes reviewed the budget and noted there is only a slight difference in the budget for the two options. The project will be a dual purpose underpass, pedestrian and drainage. The schedule has the two options through about 30 percent of the design Full design is anticipated by mid -2018 and the railroad portion, the bridge, mid -2019 Completion should be end of 2019. This will be designed to allow the underpass trail to be dry up to the 2 -year frequency storm event. Any storms above the 2 -year storm will flood the trail during the storm with depths up to 3.5 feet in a 100 -year storm. This was a project team decision to balance cost and benefit. Options were presented at 3 open house meetings and made available on the web with respondents favoring Option 2 Council member Loo asked if the district (Urban Drainage and Flood Control District) would contribute to any cost overruns. Fowlkes noted the City would ask Urban Drainage to share any cost overruns, but cautioned they may have budget constraints not allowing them to spend any more money on this project Frank Schultz and Andrew Holton, Atkins, showed animations of the two options for the underpass which is west of the existing Takoda subdivision along Bullhead Gulch. On the east side of the railroad tracks both options are the same due to the alignment of the existing trail in Steel Ranch (Takoda). On the west side of the railroad tracks there are two options for consideration • Option 1 - Keep the north -south trail at existing elevations and drop down into the underpass within the railroad right of way. This creates an "S" alignment into the underpass. • Option 2 - Lower the north -south trail and have a "T" style intersection that aligns directly with the underpass. Option 1 — Pros & Cons Pros • 1. Less Project Disturbance compared to Option 2 • 2 Realigned portion of trail is further from railroad tracks • 3. Trail phasing allows trail to remain open during construction. Cons • 1. Sight lines entering from west side because of curves • 2. Curvilinear entrance from west • 3 Awkward access for southbound users • 4. More disturbance in BNSF right of way