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Alachua County Board of County Commissioners

Alachua County Board of County Commissioners. NW 16 th Avenue / NW 23 rd Avenue (NW 57 th Terrace to NW 13 th Street). Alachua County Public Works. HDR Engineering Gainesville. HDR Engineering Gainesville. NW 16 th Avenue / NW 23 rd Avenue. PURPOSE.

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Alachua County Board of County Commissioners

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  1. Alachua CountyBoard of County Commissioners NW 16th Avenue / NW 23rd Avenue (NW 57th Terrace to NW 13th Street) Alachua County Public Works HDR Engineering Gainesville

  2. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue PURPOSE Provide a status update and present preliminary plans on the NW 16th Ave/NW 23rd Ave project. • Project Overview and Scope • Enhancement Options • Questions Presentation outline

  3. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue PROJECT LAYOUT NW 16th Avenue / NW 23rd Avenue (From NW 57th Terrace to NW 13th Street)

  4. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue EXISTING TYPICAL SECTION NW 23rd Avenue From NW 55th Street to NW 43rd Street

  5. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue EXISTING TYPICAL SECTION NW 16th Boulevard & NW 16th Avenue From NW 43rd Street to NW 13th Street

  6. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue PROJECT SCOPE • Resurface and rehabilitate pavement • Upgrade curb ramps and driveways to current Americans with Disabilities Act standards • Address safety and operational issues • Stabilize retaining walls Deteriorating Pavement Non-Compliant Curb Ramp Safety Issue Leaning Retaining Wall

  7. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #1 EXISTING PAVEMENT CONDITIONS • A variety of failure modes were found: • Rutting • Cracking • Potential base failure (isolated locations) WB NW 16th Avenue west of NW 20th Street EB NW 16th Avenue east of NW 24th Street Common Pavement Failure Example of Good Pavement

  8. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #1 EXISTING PAVEMENT CONDITIONS In many locations the pavement has rutted in the wheel paths. Rutted pavement can trap water and increase the chances of hydroplaning. EB NW 23rd Avenue west of NW 46th Street

  9. HDR Engineering Gainesville #1 EXISTING PAVEMENT CONDITIONS In several locations the surface coarse has chipped off the pavement. WB NW 16th Avenue east of NW 31st Terrace EB NW 16th Boulevard west of NW 41st Street

  10. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #1 PROPOSED PAVEMENT REHABILITATION Mill and Resurface To Base Layer Existing Pavement Milled Pavement • Full depth construction may be necessary in some locations Resurfaced Pavement

  11. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #2 AMERICANS WITH DISABILITIES ACT Existing Non-Compliant Features Longitudinal slope exceeds 1:12 Improper warning surface Ramp width less than 4’ All non-compliant sidewalk curb ramps and driveways will be replaced Cross slope exceeds 2%

  12. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue NW 23rd Avenue Widening Raised Traffic Separator West of 43rd St. Median Closures\Modifications East of 43rd St. Median Closure West of 13th St. Miscellaneous Safety Improvements #3 SAFETY IMPROVEMENTS

  13. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS Crash reports from 2005 through 2007 were studied for types of crashes, locations of crashes, time of day and weather conditions

  14. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS The actual crash rates were compared to the statewide average crash rate for the particular type of roadway. Statewide average crash rate for NW 23rd Ave is 3.753 Statewide average crash rate for NW 16th Blvd and NW 16th Ave is 2.589

  15. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS NW 23rd Avenue Widening

  16. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS NW 23rd Avenue Widening

  17. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS NW 23rd Avenue Widening Typical Section

  18. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue SAFETY IMPROVEMENTS . NW 23rd Avenue west of NW 43rd Street . Solution: Install Raised Traffic Separator

  19. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS NW 16th Boulevard east of NW 43rd Street

  20. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #3 SAFETY IMPROVEMENTS Median Opening West of 13th St. Citgo Gas Station Georgetown Apartments

  21. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #4 RETAINING WALL Existing Problems Two walls on the north side of NW 16th Ave. are in need of repair • Walls have rotated outward • Concrete has cracked and spalled • Reinforcing bars exposed due to concrete spalling

  22. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #4 RETAINING WALL Causes • Wall heights exceed standard design • Pressure created from trapped water behind the walls • Clay soils behind wall prevent water from reaching weep holes *The walls are not in imminent danger of collapse.

  23. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue #4 RETAINING WALL Solution • Reduce the wall height • Add drainage layer and weep holes • Improve the appearance and protect reinforcing with a new concrete façade

  24. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue OPTIONAL ENHANCEMENTS 1st Option: Narrow vehicle lanes to create 2’ shoulder NW 16th Blvd\ NW 16th Ave from NW 43rd Street to NW 13th Street Restripe all lanes to 11’ width, creating a 2’ wide shoulder on each side providing additional space for on the road bicyclist.

  25. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue OPTIONAL ENHANCEMENTS 1st Option: Narrow lanes to create 2’ shoulder • Advantages: • Provides additional space adjacent to the curb for bicyclist by reducing the roadway width designated for vehicles • Disadvantages: • Does not provide a designated bike lane • There will only be 21” of pavement between the curb edge and the outermost edge line.  This will place the bicyclist in a very narrow designated area. • Vehicles may assume the marked shoulder adequately accommodates bicycles and may be less prone to move to the inside to provide the bicyclist more room as they pass. • Gutter pan cannot be considered part of bike lane due to inlet types • Preliminary Cost Estimate: • No additional costs

  26. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue OPTIONAL ENHANCEMENTS 2nd Option: Widen sidewalks by infilling utility strips Fill 2.5’ wide utility strips with concrete to create a 7.5’ wide sidewalk. NW 16th Avenue from NW 34th Street to NW 13th Street The widened sidewalk will function more as a multi-use path. NW 16th Boulevard from NW 43rd Street to NW 13th Street

  27. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue OPTIONAL ENHANCEMENTS 2nd Option: Widen sidewalks by infilling utility strips • Advantages: • Provides a wider sidewalk that better accommodates school children who usually bike on the sidewalk. • Disadvantages: • Does not provide a designated bike lane • Encouraging bicyclists to use sidewalk may create conflicts at cross streets • Bicyclists would still conflict with pedestrians, even on the wider path. • Preliminary Cost Estimate: • NW 16th Boulevard & NW 16th Avenue: $397,889

  28. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue OPTIONAL ENHANCEMENTS 3rd Option: Widen and restripe to create designated bicycle lanes NW 16th Blvd / NW 16th Ave from NW 43rd Street to NW 13th Street Add 2’ of pavement to the median in both directions and narrow all lanes to 11’ width. This will provide room for a standard 4’ bike lane in each direction.

  29. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue OPTIONAL ENHANCEMENTS 3rd Option: Widen and restripe to create bicycle lanes • Advantages: • Provides designated Bike Lanes from NW 43rd Street to NW 13th Street • Provides bike route continuity connecting to existing designated Bike Lanes on NW 23rd Avenue and NW 43rd Street. • Disadvantages: • Potential loss of some median landscaping in order to maintain sight lines in narrowed median. • Preliminary Cost Estimate: • NW 16th Boulevard & NW 16th Avenue: $586,493

  30. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue COST SUMMARY Recommended project base cost: $5,388,646 Optional Enhancement #1 additional cost: $0 Optional Enhancement #2 additional cost: $397,889 Optional Enhancement #3 additional cost: $586,493

  31. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue PUBLIC INVOLVEMENT • Conduct Public Meeting in November 2009. • Conduct additional special meetings, as required.

  32. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue NEXT STEPS • Public Meeting: • November 2009 • Present 30% Plans to BOCC for approval: • January 2010

  33. HDR Engineering Gainesville NW 16th Avenue / NW 23rd Avenue RECOMMENDATION • Hear the presentation and provide comments on the preliminary plans for the NW 16th Ave/NW 23rd Ave project in preparation of the public meeting in November 2009.

  34. Thank you Any Questions? Alachua County Public Works HDR Engineering Gainesville

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