Download - Alachua County Board of County Commissioners
Alachua CountyBoard of County Commissioners
NW 16th Avenue / NW 23rd Avenue(NW 57th Terrace to NW 13th Street)
Alachua CountyPublic Works
HDR EngineeringGainesville
PRESENTATION OUTLINE
NW 16th Avenue / NW 23rd Avenue
HDR EngineeringGainesville
• Project Overview and Scope• Enhancement Options• Questions
Provide a status update and present preliminary plans on the NW 16th Ave/NW 23rd Ave project.
PURPOSE
PROJECT LAYOUTNW 16th Avenue / NW 23rd Avenue
(From NW 57th Terrace to NW 13th Street)
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
EXISTING TYPICAL SECTIONNW 23rd Avenue
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
From NW 55th Street to NW 43rd Street
HDR EngineeringGainesville
EXISTING TYPICAL SECTIONNW 16th Boulevard & NW 16th Avenue
NW 16th Avenue / NW 23rd Avenue
From NW 43rd Street to NW 13th Street
PROJECT SCOPE1) Resurface and rehabilitate pavement
2) Upgrade curb ramps and driveways to current Americans with Disabilities Act standards
3) Address safety and operational issues
4) Stabilize retaining walls
Safety IssueNon-CompliantCurb Ramp
DeterioratingPavement
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
LeaningRetaining Wall
#1 EXISTING PAVEMENT CONDITIONS
• A variety of failure modes were found:• Rutting• Cracking• Potential base failure (isolated locations)
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
Common Pavement Failure Example of Good Pavement
EB NW 16th Avenue east of NW 24th Street
WB NW 16th Avenuewest of NW 20th Street
#1 EXISTING PAVEMENT CONDITIONS
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
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 Avenuewest of NW 46th Street
#1 EXISTING PAVEMENT CONDITIONS
HDR EngineeringGainesville
In several locations the surface coarse has chipped off the pavement.
WB NW 16th Avenueeast of NW 31st Terrace
EB NW 16th Boulevardwest of NW 41st Street
#1 PROPOSED PAVEMENT REHABILITATIONMill and Resurface To Base Layer
Full depth construction may be necessary in some locations
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
Existing Pavement Milled Pavement
Resurfaced Pavement
#2 AMERICANS WITH DISABILITIES ACTExisting Non-Compliant Features
All non-compliant sidewalk curb ramps and driveways will be replaced
HDR EngineeringGainesville
Improper warning surface
Cross slope exceeds 2%
Longitudinal slope exceeds 1:12
Ramp width less than 4’
NW 16th Avenue / NW 23rd Avenue
#3 SAFETY IMPROVEMENTS
• 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
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
#3 SAFETY IMPROVEMENTSCrash reports from 2005 through 2007 were studied for types of crashes, locations of crashes, time of day and weather conditions
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
#3 SAFETY IMPROVEMENTSThe actual crash rates were compared to the statewide average crash rate for the particular type of roadway.
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
NW 23rd Ave. NW 16th Blvd. NW 16th Ave.
4.78
2.112.39
3.15
2.34
1.71
3.71
1.772.05
2005
2006
2007
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
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
#3 SAFETY IMPROVEMENTSNW 23rd Avenue Widening
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
#3 SAFETY IMPROVEMENTSNW 23rd Avenue Widening
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
#3 SAFETY IMPROVEMENTSNW 23rd Avenue Widening
Typical Section
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
SAFETY IMPROVEMENTS.
Solution:Install Raised Traffic Separator
HDR EngineeringGainesville
NW 23rd Avenue west of NW 43rd Street
.
NW 16th Avenue / NW 23rd Avenue
HDR EngineeringGainesville
#3 SAFETY IMPROVEMENTSNW 16th Boulevard east of NW 43rd Street
NW 16th Avenue / NW 23rd Avenue
#3 SAFETY IMPROVEMENTSMedian Opening West of 13th St.
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
GeorgetownGeorgetownApartmentsApartments
CitgoCitgoGas StationGas Station
#4 RETAINING WALLExisting Problems
• Walls have rotated outward• Concrete has cracked and spalled• Reinforcing bars exposed due to concrete spalling
Two walls on the north side of NW 16th Ave. are in need of repair
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
#4 RETAINING WALLCauses
• 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.
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
#4 RETAINING WALLSolution
• Reduce the wall height• Add drainage layer and
weep holes • Improve the appearance
and protect reinforcing with a new concrete façade
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
OPTIONAL ENHANCEMENTS
Restripe all lanes to 11’ width, creating a 2’ wide shoulder on each side providing additional space for on the road bicyclist.
NW 16th Blvd\ NW 16th Ave from NW 43rd Street to NW 13th Street
1st Option: Narrow vehicle lanes to create 2’ shoulder
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
Advantages: Provides additional space adjacent to the curb for bicyclist by reducing the roadway width designated for vehiclesDisadvantages: 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 typesPreliminary Cost Estimate: No additional costs
OPTIONAL ENHANCEMENTS1st Option: Narrow lanes to create 2’ shoulder
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
OPTIONAL ENHANCEMENTS2nd Option: Widen sidewalks by infilling utility strips
NW 16th Avenue from NW 34th Street to NW 13th Street
NW 16th Boulevard from NW 43rd Street to NW 13th Street
Fill 2.5’ wide utility strips with concrete to create a 7.5’ wide sidewalk.
The widened sidewalk will function more as a multi-use path.
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
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
OPTIONAL ENHANCEMENTS2nd Option: Widen sidewalks by infilling utility strips
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
OPTIONAL ENHANCEMENTS3rd 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.
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
OPTIONAL ENHANCEMENTS3rd 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
HDR EngineeringGainesville
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
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
PUBLIC INVOLVEMENT
• Conduct Public Meeting in November 2009.• Conduct additional special meetings, as required.
NEXT STEPS
• Public Meeting: – November 2009
• Present 30% Plans to BOCC for approval: – January 2010
HDR EngineeringGainesville
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.
HDR EngineeringGainesville
NW 16th Avenue / NW 23rd Avenue
Thank you
Any Questions?
Alachua CountyPublic Works
HDR EngineeringGainesville