Specifications include, but are not limited to: The Project is located within the Schultz Creek drainage corridor in Flagstaff, Arizona, and can be described as a stormwater infrastructure improvements project. The existing box culvert and downstream stormwater infrastructure within US Highway 180 has limited capacity to convey stormwater runoff in the post-fire conditions. The Project is comprised of a new sediment basin, channel regrading, alluvial fan, box culvert, landscaping, demolition/abandonment of existing stormwater conveyance structures and removal and replacement of existing pavements within US Highway 180 and private properties. The Schultz Creek channel will be regraded and re-routed to improve capacity and realign the channel with a new box culvert under US Highway 180 and to the west to the Rio de Flag. The new box culvert will be sized to convey a higher flow rate than the existing stormwater infrastructure. A new sediment basin will be designed upstream of the new box culvert to release sediment prior to the stormwater entering the box culvert. A new alluvial fan like structure will be designed downstream of the box culvert to slow stormwater discharge before entering the Rio de Flag. The parcel containing the alluvial fan will have beatification components consisting of landscaping, rock placement, etc. Existing stormwater infrastructure will need to be abandoned in place or removed, but is to be determined. Other components of the project will be several franchise utility relocations, City utility replacement/realignments, and roadway replacement. Engineering 30% designs are shared in the supplemental information of this RSOQ.
