Parks and Recreation Commission Meeting Packet - February 28, 2008

Home Browse Search

OPTIONS The two primary options for dealing with the stored bridges are 1) re -use the bridges at new locations within Mounds View, and 2) sell the bridges. Re -use of the bridges will be discussed in detail later in this report. If the City chose to sell the bridges, a rough estimate of their resale value would probably be in the range of $10,000 to $15,000 each, This resale value is based on an estimated cost of approximately $30,000 for each bridge if they were to be purchased new. There would be no guarantee of finding a willing buyer, as the geometry of the bridges would need to be an exact match for the buyer's site requirements. RE -USE BRIDGES Re -using the bridges is feasible, provided the new locations match the bridge geometry. The process that would need to be followed involves several tasks, including both design and construction phases, The following is a brief discussion of the tasks that are typically required for the design and construction of a pedestrian bridge crossing, along with estimated costs for each task. DESIGN (PRE -CONSTRUCTION) TASKS • Site Survey. Determine topography, locate utilities and possible construction conflicts, define floodplain for hydraulic analysis. • Wetland Delineation. Determine presence and type of wetlands that could be impacted by construction. • Geotechnical Exploration. Determine subsurface soil conditions and obtain recommendations for bridge foundation support. • Hydraulic Analysis. Determine effect structure will have on channel flow, and possible impacts to floodplain zoning. • Hazardous Materials Investigation. If replacing an existing structure, conduct an investigation to determine presence and disposal requirements of hazardous materials. • Structure Design. Design concrete abutments, prepare construction plan sheets, prepare construction specifications, thorough inspection of existing bridges, coordinate inclusion of salvaged bridge superstructure. CONSTRUCTION TASKS • Deliver Bridge. Bridge must be moved from storage location to new project location. • Abutment Construction. Build new concrete abutments to support bridge, including excavation, backfill, and placement of riprap for scour protection. • Drive Piling. Mobilize pile driving equipment, furnish and drive piling (piling may or may not be required, depending on results of geotechnical exploration). • Install Bridge. Install existing bridge onto new abutments, • Redeck. Replace worn timber decking with new naturally durable timber decking. • Construction Administration. Construction survey, observe and document construction activities, review payment submittals from contractor, and coordination as necessary with the City. Mounds View, MinnesotaProject No: 435-07000-0 Pedestrian Bridge Re -use f Bonestroo Page 2