City of Somersworth

1
City of Somersworth

• Presentation to City Council on
• Pavement Management
• Presented by
• Joe Ducharme, Jr., P.E.
• Contract City Engineer
• Britt E. Audett, P.E.
• CMA Engineers, Inc.

2
Pavement is an Asset

• Citys Public Infrastructure Assets include
• Drainage Systems
• Parks
• Paved Roads
• Public Buildings
• Schools
• Sewage Treatment
• Plant
• Sewage Collection
• System
• Sidewalks
• Water Distribution
• System
• Water Treatment Plant

3
Somersworths Paved Roads

• 50 miles of paved roads maintained by the City
  of Somersworth.
• At avg pavement thickness of 4-inches, equates to
  more than 180,000 tons of pavement.
• Replacement value to reconstruct all paved roads
  (including gravel base) 25,000,000 million
  dollars.

4
Preservation vs. Reconstruction

• Uniform pavement surface limits water penetration
  to road base below (good)
• Cracked road surface allows water penetration,
  frost heaves, pot holes (bad)
• Cost of reconstructing a bad road can be 10 to 20
  times more than surface treatment on a good
  road
• Good road surface preserved road base longer
  service life lower cost to maintain

5
Pavement Management Plan

• Elements of a PMP
• 1. road inventory
• 2. road condition
• 3. road classification
• 4. local repair methods and costs
• 5. project prioritization
• 6. funding
• 7. implementation
• 8. annual updates to the plan

6
Road Inventory

• 50 miles of City-maintained paved roads
• 3D Laser Imaging all lanes
• Imaging linked to GIS
• coordinates

7
Pavement Condition

• Pavement Condition Index (PCI)
• Ranges from 0 to 100 (higher better)
• Strive for 75 or higher good/satisfactory
• City-wide average PCI 53

PCI Rating Scale PCI Rating Scale
90-100 Good
70-90 Satisfactory
50-70 Fair
40-50 Poor
30-40 Very Poor
10-30 Serious
0-10 Failed
8
PCI Distribution

• PCI Range Total Miles
• Failed (0-10) 0
• Serious (10-30) 9.3
• Very Poor (30-40) 7.2
• Poor (40-50) 6.9
• Fair (50-70) 11.4
• Satisfactory (70-90) 9.1
• Good (90-100) 4.3

9
Union Street PCI 21
Maple Street PCI 60
Willand Drive PCI 93
10
Road Classification

• Primary, Secondary, Neighborhood
• Road Segment Length Width
• Daily Traffic Volumes
• Critical Routes (school buses emergency
  services plowing)
• Business/Commercial

11

• Primary Roads
• High Street
• Main Street
• Blackwater Road
• Salmon Falls Road
• Indigo Hill Road

• Secondary Roads
• Maple Street
• John Parsons Drive
• Willand Drive
• Tates Brook Road

• Residential Roads
• Highland Street
• Congress Street
• Union Street
• Primrose Lane

12
Local Cost of Repairs (2014)

• Crack Seal/Fog Seal/Spot Repair 4.00/SY
• Surface Treatment (Chip Seal) 8.00/SY
• Shim Overlay (1overlay) 12.00/SY
• Mill and 1.5 Overlay 20.00/SY
• Full Depth Reclamation w/ SS-1 Emulsion
• Injection or Portland Cement 30.00/SY
• Full Box Out and Reconstruction 70.00/SY

13
Establish Priorities

• Consider road classification
• Consider other City needs (utilities)
• Coordinate repairs to leverage funds
• Run the PMP program
• Top-Down Approach maintain good roads first
• Goal is to raise average PCI gt 75

14
Life of Pavement

• Source For Pavement Preservation Task Force
• www.fp2.org

1 of preventive maintenance here
100
40 Drop in Quality
Eliminates or delays spending 8 - 10 on
rehabilitation here.
75 of Life
PCI (Pavement Condition Index)
40 Drop in Quality
12 of Life
Total Reconstruction 40
0
Years
15
Coordinate Repairs

• Dig the Road Once
• Consider Pending CIP Projects to leverage other
  City Funds
• water enterprise
• sewer enterprise
• Consider Commercial /
• Private Developments

16
Pavement Management Plan

• Local input for repairs, costs, other needs
• Goal is to bring all roads up to
  satisfactory/good condition
• Run scenarios yrs / annual budget / avg PCI
• Adjust and update annually for CIP

17
Level of Investment Matters

• Goal is to achieve City-wide PCIgt75

18
PMP Updates

• Annual updates to database by staff
• Annual monitoring by staff for road deterioration
  (compare to video library)
• Re-run repair funding scenarios annually
• Coordinate repaving with other CIP projects
• Update road condition imaging periodically (every
  4-6years)