Terminal Avenue South: Road Rehabilitation and Utility Upgrade Project
The City is currently in the process of completing the engineering design for the rehabilitation of Terminal Avenue South and associated utility upgrades. This work is identified in the City Capital Plan for construction in 2017 and 2018. The intent is to complete the design works in 2016, with the utility upgrades completed in 2017. In 2018 the pavement restoration will be completed to finish the project. The project area includes Terminal Avenue from St. George Street to Stewart Avenue with the approximate limits shown in Figure 1 below.
Terminal Avenue is a mixed use corridor with single dwelling and multi-unit residential amongst various commercial properties. Some of the commercial business have alternate access from side streets off of Terminal Avenue, however the majority of residential dwellings do not making the corridor important to both residents and businesses. Current traffic loads of over 30,000 vehicles result in a very active corridor.
The City is also committed to strategic asset management and observes utility improvement projects as a whole, considering the remaining design life of all assets within the project area. Those determined to have a future impact within the expected 25-year life of the rehabilitated road surface were scheduled for replacement including sanitary sewers, storm sewers, and watermains
Sanitary Sewer Replacement
The sanitary sewers requiring replacement along Terminal Avenue are mainly Asbestos Cement installed in 1960. These sewers generally run parallel with the roadway underneath the sidewalks and will be replaced in their current location (online). A total of 1320m of sanitary sewer is scheduled to be replaced under this project. Wherever possible, the sidewalks that are removed or damaged during construction will be rebuilt with 1.8m - 2.1m wide asphalt sidewalks to improve the safety of pedestrian travel throughout the corridor.
The two major areas for sanitary sewer replacements are dashed in yellow and shown for the north (Figure 2A) and south (Figure 2B) parts of the project area.
|Figure 2A||Figure 2B|
Storm Sewer Replacement/Improvement
Two surface drainage improvements will be completed that will remove operational risk associated with the existing pipe alignments. Alternate drainage routes will be evaluated and the sewers rebuilt in order to eliminate any private property issues and ensure access is available for future operation and maintenance. Figures 3A and 3B show the location of these improvements along with their potential new locations which total 450m of new storm sewer.
|Figure 3A||Figure 3B|
While most of the watermain in the Terminal Avenue right-of-way was upgraded to Ductile Iron in 1991, some sections of much older Cast Iron watermain from 1954 currently remain and are scheduled for replacement prior to restoration of the road surface in 2018. As part of this project approximately 260m of watermain will be upgraded/replaced. Figure 4 shows the main location of the water system improvements on Terminal between Dawes and Stewart.
Once all of the subsurface utilities have been upgraded, the surface pavement along Terminal Avenue will be rehabilitated using a technique called Mill and Overlay. This will extend the life of the existing roadway by 20-25 years and will create a smooth surface by eliminating the effects of tire ruts and asphalt breakdown that has occurred over decades of use.
This is accomplished by grinding out a depth of approximately 65 mm of existing asphalt, and replacing it with the same depth of new hot mix asphalt. As the project scope does not include any road widening, the existing curbs, gutters, and sidewalks will remain, with only the pavement surface being restored; approximately 22,500 m2 of road surface area will be rehabilitated.
The anticipated schedule is below with the intent for the project to be ready for tendering and construction in 2017.
|Award of Consulting Contract||January 2016 (complete)|
|Pre-Design memo (Draft)||March 2016 (complete)|
|Pre-Design memo (Final)||April 2016 (complete)|
|50% detailed design submission||May 2016 (complete)|
|95% detailed design submission||October 2016 (complete)|
|100% detailed design submission||December 2016 (complete)|
|Tendering and construction||January 2017|
January 2017 – Detailed design is complete and the utility upgrade portion of the project will be tendered for construction in late January, with an expected start of March 1. The timing of each utility upgrade will depend on the contractors proposed schedule. The timing of these works will be updated here, along with any significant traffic closures (location and duration). In order to minimize the effect of potential trench settlement following the utility upgrades, the pavement resurfacing of Terminal Avenue (from Pearson Bridge to St. George Street.) will be completed in 2018.
Watch for updates as the project moves forward.
Project Area History
Terminal Avenue was historically owned and maintained by the Province, and provided the main north-south corridor for travel through Vancouver Island and the City of Nanaimo. Following the construction of the Nanaimo Parkway in 1997, the section of Terminal Avenue between Stewart Avenue and Brechin Road was transferred to the City as it was then suggested to primarily serve a municipal function, and was no longer useful to the Provincial government.
In 2014 the City Road Operations staff completed an inspection of the asphalt along Terminal Avenue and found that the road pavement was failing badly in many locations and was at the end of its useful life. Pavement distress was readily observed in the form of considerable longitudinal and transverse cracking, as well as displacement of the road surface due to road base failure. Additional defects included significant rutting within the vehicle wheel alignment, polished road surface aggregate, and pothole formations from joint separation of asphalt lifts. The wheel rutting and surface lift cracking has reduced effective drainage within the roadway, allowing water ingress to exacerbate the breakdown of the road structure.
Considering the above, it was recommended that major road rehabilitation be expedited and completed within the 5-year Capital Plan. City staff have identified, budgeted, and scheduled interim maintenance measures that will preserve the pavement quality index and road function on this section of Terminal Avenue until major pavement rehabilitation is completed in 2018.
Want To Know More?
If you have any comments or questions on the planned improvements, please contact us at 250-754-4251 ext. 4230 or email EngineeringInfo@nanaimo.ca.
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