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Park City to advertise bids for Channel 4 stormwater Phase 1; box culverts, drop structures and tree removal planned
Summary
Council received a presentation on the Channel 4 stormwater Phase 1 project, which includes about 660 linear feet of precast box culvert, 10 concrete drop structures, selective bank armoring and the removal of approximately 70 trees. Staff plans to advertise bids in May with an anticipated October start.
Park City officials on April 22 received a presentation on Phase 1 of the Channel 4 stormwater drainage project and authorized staff to advertise the work for competitive bids.
The project corridor begins near City Hall and runs downstream through back lots and residential areas to Evanston Drive near the floodway. Wilson & Company engineers told the council the scope includes channel grading, upgrades to multiple roadway crossings, concrete structures to slow flow, and bank armoring at tight channel curves.
Jeff Holstein of Wilson & Company told the council the project will include about 660 linear feet of box culvert across six roadway crossings, including one long 280-foot precast culvert segment. "This channel project starts here at the ditch for City Hall," Holstein said. "The map that you have... is the area that contributes directly to the channel." He said the design also calls for 10 sloping concrete drop structures to reduce velocity and erosion, and constrained channel segments will receive basketed gabion armoring rather than loose rock to make future maintenance easier.
The engineering team identified several utility conflicts in the Hydraulic Avenue area and proposed limited sanitary-sewer relocations and encasement where necessary to provide clearance for new culverts. Wilson & Company estimated that about 70 trees 12 inches or greater in diameter would be removed along the corridor to enable long-term maintenance and mowing; staff said access gates and ramps will be installed at crossings so maintenance crews can use UTV-type equipment.
Wilson & Company expects to advertise the bid package in the coming week, with a bid opening in May. The consultant recommended a construction window starting Oct. 1 to reduce weather and water-control risk; the anticipated construction duration is four to six months so work can be completed before spring runoff and revegetation established.
Councilmember Troy Hill moved to receive and file the presentation; the motion passed unanimously, 8-0.
Wilson & Company and city staff said precasting box culverts and scheduling construction in the winter/fall window should lower prices and reduce schedule risk. The plan includes channel bottom widths of roughly 10 feet with varying side slopes, and selective replacement or encasement of sanitary sewer where it conflicts with box culvert installations.
The council did not take an award decision this evening; staff said they would return to the council after the formal bid opening with a recommendation and contract documents.
