Burgoyne Bridge Environmental Barrier

LOCATION:  St.Catharines,Ontario
TIMEFRAME: 2015/2016
SCOPE OF WORK: Manufacture and Installation of geomembrane lining system to protect EPS Light Weight Fill from hydrocarbon degradation
PROJECT PARTNERS: Owner: Municipality of Niagara Region Engineer: Delcan Contractor: Pomerleau, Geomembrane Manufacturer & Installer – Layfield Canada Ltd.

Background Information and Challenge

The Burgoyne Bridge located in Niagara region is a critical artery which connects downtown 2-(2).pngSt.Catherines to the west end of the city. The 400m long Bridge spans the 12 mile creek, Highway 412 and sensitive fish habitat and Conservation area. The original structure was built back in 1912. As a result of years of degradation and increase demands a decision to repair or replace was required. Assessment by an engineer estimated the useful life of approximate 7 years in its current state. A decision was made to replace the entire structure with a new and modern bridge systems which would be suitable for many years to follow.

Geotechnical survey reveilles the soil condition over bedrock were subject to considerable settlement. As a result a light weight fill such as Expanded Polystyrene would be required to minimize this settlement. EPS was chosen as a light weight fill option however required a geomembrane protection layer to protect from degradation from liquid hydrocarbons such as diesel, gasoline, kerosene, hydraulic fluid. The geomembrane lining system would need to withstand the long term design of the structure (excess of 100years), primary contact with hydrocarbons and flexible in nature to confirm to the 90 degrees corns and angles of the EPS.

Solution

Layfield proposed the EL6040HD EnviroLiner Geomembrane liner for the application. The EL6040HD is a flexible fortified LLDPE/HDPE geomembrane lining system manufactured and installed by Layfield Canada. The flexible geomembrane is manufactured with prime grade resins and antioxidants to deliver a long term reliable protection system. The lining system has excellent chemical resistant properties and suitable for containment of solvent and water vapors. Independent permeability testing was completed for a variety of popular fuels to satisfy the client. The membrane is durable and able to resist puncture, backfilling in an under slab application. The flexible properties of this system allowed prefabrication and tailored fit to wrap the EPS blocks.

Installation of the lining system was completed in 2 phases by Layfield installation crews. Phase one included the abutment and phase 2 the abutment. Layfield used a combination of prefabricated shop fabricated lining panels and roll stock fusion welded on site. A split wedge welding was used which allowed the installation to pressure test the seam for any seam leakage. Layfield worked closely with the site contractor t coordinate installation schedule.

Results

The project was completed on time and schedule with the contactor. The bridge is expected to be commissioned during 2017/2018. The project was particularly challenges as our crews were required to coordinate closely with the contractors schedule of construction which his difficult to predict. Both the owner and the contractor were very pleased to work with Layfield and look forward to working together on future projects.

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