GEORGINA ISLAND Roads Upgrade and Drainage Project Presentation to - - PowerPoint PPT Presentation

GEORGINA ISLAND

Roads Upgrade and Drainage Project Presentation to The Community March 4, 2014

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Introduction



C.C. Tatham & Associates Ltd. (CCTA) retained by Georgina Island First Nation (GIFN) to provide professional engineering services for upgrading of approximately 10 km of roads;

Introduction



Project includes:



Assessment of existing roadway conditions;



Chief Joseph Snake Road, Loon Road, Bear Road and Root Road;



LVM Inc. providing geotechnical advice.

 Sidewalk recommendations;  Cost estimates;  Drainage improvements;  Life cycle analysis;  Recommendations for cost effective reconstruction options;

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Drainage Overview



Regrading and culvert replacement to provide uniform unobstructed ditches will improve surface drainage;

Chief Joseph Snake Road, Bear Road and Root Road

Drainage Review



Drainage outlets are blocked or missing, restricting flow;



Existing ditching is poorly defined, shallow and overgrown;



Drainage concerns between Chief Joseph Snake Road, Turtle Road and the lake related to low topography and maintenance needs;



Outlet improvement at campground on Bear Road.

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Road Overview

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Road Overview



Ditching exists only on southwest side, poorly defined and overgrown;

Loon Road



Install a French drain on northeast side to collect road surface runoff, discharging to southwest ditch;



Regrade southwest ditch to a uniform positive grade.

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Geotechnical Evaluation



Thorough evaluation of current roadway conditions:

LVM Investigation



Roadway distresses;



Granular base/subbase/surface treatment depths;



Road structure materials.



Distresses related to:



Relatively flat road profiles;



Proximity to wetlands;



Undefined outlets and high lake levels relative to road ditches and road bases;



Existing road structure is shallow, substandard granular material;



Concluded existing pavements are well beyond their functional service lives and major rehabilitation is required.

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Rehabilitation Options

 Place 100 mm granular material over existing pavement (utilizing material

quarried on site if available);

Rehabilitation Method - Foamed Asphalt Stabilization

 Pulverize granular material and existing road structure to depth of 225

mm;

 Stabilize pavement surface with expanded (foamed) asphalt to depth of

150 mm;

 Double layer surface treatment;  Regrade all ditches and replace driveway

and road cross culverts.

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Rehabilitation Options

 Full depth excavation;

Other Rehabilitation Options and Lifecycle Analysis

 Pulverize asphalt;  Mechanical reinforcement.  Considers initial capital cost plus 20 years of maintenance;  Full depth reconstruction has highest capital cost and 2nd highest

maintenance cost with crack sealing and repaving in year 15;

 Pulverizing has lowest capital cost and highest maintenance cost with

annual spray patching and surface treatment in years 8 and 16;

 Foamed asphalt stabilization has 2nd lowest capital cost and lowest

maintenance cost with surface treatment in years 10 and 20;

 Foamed asphalt stabilization is the most cost effective.

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Cost Estimates

 Foamed Asphalt Stabilization $ 5,560,000;

Construction Cost Estimates

 Includes 10% contingency;  Includes all drainage improvements within roadway;  Assumes imported granular material, may be reduced by use of on-site

quarries;

 Does not include sidewalk costs;  Does not include outlet cleaning/improvements.

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Sidewalk

Sidewalk

 1.5 m widening of south bound lane of road;  Low traffic volumes and speeds minimize safety concerns;  Delineation of the walkway by line painting;  Winter maintenance completed by existing snow removal equipment;  Does not alter the established drainage patterns;  Does not require work beyond the right-of-way;  Estimated construction cost approximately $392,000.

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Sidewalk

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Summary

 Foamed asphalt stabilization with double surface treatment;

Summary

 Most cost effective rehabilitative method to provide adequate structural

capacity and meet functional service life expectations;

 Rehabilitates existing road structure and minimizes placement of new

granulars, thereby reducing costs;

 Double surface treatment for hard surfacing is a cost effective alternative

to hot mix asphalt and provides more flexibility during movement of the subgrade due to frost actions and spring thaw;

 Existing granular quarry material may be suitable for this rehabilitation

method and result in further cost savings.

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Next Steps

 GIFN confirm preferred solution and construction schedule (2014/2015);

Next Steps

 Liaison with agencies (MNR, DFO, LSRCA);  Survey drainage outlets;  Assess quality and quantity of island quarry material;  Prepare final design and tender documents;  Circulate to invited contractors for tendering;  Contract award and construction.

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Contact Information

Ted Kruska, C.E.T., Project Manager C.C. Tatham & Associates Ltd. t: (705)325-1753 x 225 f: 705)325-7420 e: tkruska@cctatham.com Tim Collingwood, B.A.Sc., P.Eng., Director, Manager – Orillia Branch C.C. Tatham & Associates Ltd. t: (705)325-1753 x 224 f: (705)325-7420 e: tcollingwood@cctatham.com

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