1 tacoma streets 101cms.cityoftacoma.org/cro/pavement 101.pdf · · 2012-06-081 tacoma streets...

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Tacoma Streets 101

6/8/2012City of Tacoma - Citizen Neighborhood Street Improvement and Safety Task Force

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Streets Maintenance Overview• Type and amount of streets

• Condition and types of construction

Maintenance and repair methods and costs• Maintenance and repair methods and costs

• Sample Project Philosophy/Selection Criteriap j p y


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C t 6 2%Brick /

Neighborhood Streets By TypeConcrete, 6.2% Cobblestone, 0.3%

Oil Mat, 28.4%

Asphalt, 57.9%Asphalt, 57.9%


Sheet Asphalt, 7.2%

Residential Street Types4

Residential Street Types

Oil MatSheet Asphalt

6/8/2012City of Tacoma - Citizen Neighborhood Street Improvement and Safety Task ForceAsphaltCobblestone

T i l A h lt R d

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Typical Asphalt Road


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Pavement Condition by Neighborhood Council District*g

Neighborhood Council District

Failed / Poor Good / Excellent

Central 55% 23%Eastside 48% 34%New Tacoma 49% 35%New Tacoma 49% 35%North East 14% 71%North End 55% 24%South End 54% 25%South Tacoma 49% 33%West End 41% 33%


*Based on 2008 Pavement Condition Index (PCI). Does not include streets without pavement rating.

Pavement Condition

7

80

100

Pavement Condition

5342 41 39 38 37 37 36 36 35 35

20

40

60

83100

02008 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020

Tacoma Network Score

7869

81 77 7869

79 8170 74

42

66

83

56

79

26

72

26

6370

5563

35

55

2030405060708090

01020


Network Score 2011 Future Network Score (10 yr)

Bi th f P th l

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Birth of a Pothole

Potholes begin after rain Repeated freezing and As temperatures rise, the When vehicles drive over or snow seeps into cracks and down into the soil below the road surface. The soil turns into mud and with no support, a hole can form under the

thawing or heavy traffic causes the ground to expand, pushing the pavement up.

ground returns to a normal level but the pavement often remains raised. This creates a gap,or hollow space between the pavement and the

this cavity, the pavement surface cracks and falls into the hollow space, leading to the birth ofanother pothole.

can form under the pavement.

the pavement and the ground below it.


Permanent Pothole Repair9

Permanent Pothole Repair

Mark for repair Jackhammer edges Excavate pothole


Install asphalt and level Compact asphalt Seal the edges

Permanent Repair Types

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Permanent Repair Types

Stand alone repair Wheel path repair


Lane repair

Routine Maintenance11

Routine Maintenance

Chip Seal (Applying Oil)Crack Sealing

6/8/2012City of Tacoma - Citizen Neighborhood Street Improvement and Safety Task ForceChip Seal (Compacting)Chip Seal (Rock over oil)

Grind and Overlay12

Grind and Overlay

Removing Failed PavementTypical Failed/Poor Street

6/8/2012City of Tacoma - Citizen Neighborhood Street Improvement and Safety Task Force4 years later (2012)Finished Overlay (2008)

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Cape Seal MaintenanceCape Seal uses the advantages of two sealing and rehabilitation methods and rehabilitation methods combined. It is the application of a chip seal followed within a few days b l i f iby a slurry or microsurfacing.

• Chip Seal creates a flexible water tight membrane that seals surface cracks. • Slurry Seal eliminates the loose rock, creates a tighter asphalt appearance, increases durability, and reduces roadway noise.


appearance, increases durability, and reduces roadway noise. • Less expensive than Grind and Overlay

C S l M i t

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Cape Seal Maintenance

Residential Street (Before Maintenance)

Residential Street (After Chip Seal)


C S l M i t

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Cape Seal Maintenance

Residential Street - 2007(Finished Cape Seal)

Residential Street - 2012 (5 years after Cape Seal)


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Pavement Lifecycle Costs


T f St t I t d

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Types of Street Improvement and Average Cost of Repair

Type of Improvement Average CostPermanent Pothole Repair $13.00 per sq. ft.

Cape Seal $15,000 per blockGrind and Overlay $100,000 per block

New/Reconstruction $500 000 per blockNew/Reconstruction $500,000 per blockSchool Safety Warning Beacons $90,000 per installation

Crosswalk Markings $500 per approach or $2 000 i t ti$2,000 per intersection

Sidewalks (6ft wide with curb ramps) $20,000 per block


Sample Project List:

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Sample Project List: Staff Philosophy/Selection Criteria

• Example of how $9 Million per year could be used over six years to make a real and significant improvement in the condition and safety of the City’s streets.

Wid d t ff ti j t• Widespread cost effective projects

• Maximize work performed, reduce delivery time (Minimal Design requirements)(Minimal Design requirements)

• Focus on grind and overlay, maintenance, and projects that eliminate or reduce quantity of pot-


projects that eliminate or reduce quantity of potholes.

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Philosophy Behind Selection CriteriaFocus on neighborhoods/residential streets

Distribute projects in all Neighborhood Council Districts

Safety Improvements – School safety beacons

St t h i t f d ll G i d d l / i tStretch impact of dollars - Grind and overlay/maintenance

Coordinate with public and private utilities

Go Fast/Shovel Ready Projects - Grind and overlay/maintenanceGo Fast/Shovel Ready Projects Grind and overlay/maintenance

Local Jobs (Spread the work – multiple projects and contracts)

Focus on public spaces - Schools, community centers, etc.

Complete Streets – Curb ramps, sidewalk, bike signs and striping where applicable, etc.

Project Continuation Local Improvement District (LID) backlog


Project Continuation – Local Improvement District (LID) backlog

1 tacoma streets 101cms.cityoftacoma.org/cro/pavement 101.pdf · · 2012-06-081 tacoma streets...

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