October 3, 2008Laughlin Nevada
Stephen B. Urbanek, P.E.County of Sonoma Department of Transportation and Public Works
PROMOTINGPAVEMENT PRESERVATION IN SONOMA COUNTY
Challenges
System Size and Condition
Funding
Approach to Pavement Management
Sonoma County
Population
Service Area
Lane Miles Arterials Collectors Locals
1,371 Centerline Miles to Maintain
PCI by Class
Challenges
System Size and Condition
Funding
Approach to Pavement Management
How we compare…
COUNTY PCI Ctr. LineMiles
Annual Revenue Per
Mile
MTCE Employee
s
Miles per Employee
Number of Paid Vehicle Registrations
Contra Costa 83 657 $ 28,243 80 8.2 818,086
Santa Clara 75 685 $ 28,018 130 5.2 1,385,167
Alameda 69 470 $ 35,976 58 8.1 1,125,186
San Mateo 65 316 $ 43,006 59 5.3 660,865
Solano 58 600 $ 17,111 52 11.5 329,012
Napa 54 446 $ 15,677 33 13.5 116,477
Marin 48 420 $ 26,156 46 9.1 219,844
Sonoma 44 1387 $ 20,831 91 15.2 413,168
Annual Funding Scenarios for Road Network
PCI Changes with Expenditure ($ millions) for All Roads
40
45
50
55
60
65
70
75
2007 2008 2009 2010 2011 2012
PC
I
$120
$20
$15
$10
$5
Challenges
System Size and Condition
Funding
Approach to Pavement Management
The Old Way…
Focus on Rehabilitation and Reconstruction
Reactive and political
Results showed limited improvement to the system pavement condition
In Ten Years…
By the year 2017 the County’s roads would require almost total reconstruction
Pavement Preservation Strategy Change “Worst First” Past Practice
Perform Life Cycle Analysis
Promote Preservation First
Maintenance Strategy
Develop technical expertise
Encourage innovation
Understand Systems Approach
The New Way…
The New Way…
Pavement PreservationPreventive Maintenance Prolongs the life of the road Lowers the cost of maintaining the road
The New Way…
Field Review of Treatment Options
The New Way…
Treatment Options…Our Tool Box Crack Sealing Fog Seals Rejuvenating Seals Slurry Seals Micro Seals Chip Seals Asphalt Rubber Chip Seals Thin Overlays
The New Way…
Remaining service life
Remaining service life in 10 years if all county roads if no preventive maintenance is performed
2008 Pavement Preservation Program Analysis
Project Treatment Project Cost Per
Programmed Treatment Length (Miles)Life (years) Mile-Years Cost Mile Year
Overlays 2 20 40 $ 2,100,000 $ 52,500
Asphalt Rubber Chip Seals 37.13 10 371 $ 3,500,000 $ 9,426
PASS Chip Seals (Co. Prcd.) 19.25 7 135 $ 1,000,000 $ 7,421
Rejuvenating Seals 12.57 3 38 $ 100,000 $ 2,652
Total 70.95 584
Network Need 1,371
Deficit 787 $ 6,700,000
The New Way…
2008 Pavement Preservation Program
Old = $9,000,000
250 Mile Years $36,000/Mile Year
Comparison – Old and New Strategies
New = $7,600,000
584 Mile Years$13,000/Mile Year
What’s Next?
1.Define a prioritized portion of the road network
2.Develop funding options for the remainder of the road network
Thank you!
