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


• 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)



EXISTING TYPICAL SECTIONNW 23rd Avenue



From NW 55th Street to NW 43rd Street


EXISTING TYPICAL SECTIONNW 16th Boulevard & NW 16th 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



LeaningRetaining Wall

#1 EXISTING PAVEMENT CONDITIONS

• A variety of failure modes were found:• Rutting• Cracking• Potential base failure (isolated locations)



Common Pavement Failure Example of Good Pavement

EB NW 16th Avenue east of NW 24th Street

WB NW 16th Avenuewest of NW 20th Street




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



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



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


Improper warning surface

Cross slope exceeds 2%

Longitudinal slope exceeds 1:12

Ramp width less than 4’


#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



#3 SAFETY IMPROVEMENTSCrash reports from 2005 through 2007 were studied for types of crashes, locations of crashes, time of day and weather conditions



#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



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



#3 SAFETY IMPROVEMENTSNW 23rd Avenue Widening

Typical Section



SAFETY IMPROVEMENTS.

Solution:Install Raised Traffic Separator


NW 23rd Avenue west of NW 43rd Street

.



#3 SAFETY IMPROVEMENTSNW 16th Boulevard east of NW 43rd Street


#3 SAFETY IMPROVEMENTSMedian Opening West of 13th St.



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



#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.



#4 RETAINING WALLSolution

• Reduce the wall height• Add drainage layer and

weep holes • Improve the appearance

and protect reinforcing with a new concrete façade





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



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



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.



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



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.



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



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



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



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.



Thank you

Any Questions?

Alachua CountyPublic Works


alachua county board of county commissioners

Documents

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