A success story presented at the SMART Remediation Toronto 2016 Conference on January 28, 2016.
While sliding rail shoring has been used for many years to excavate soils on industrial job sites, Hemmera and Claybar Contracting Inc. have adapted the use of these shoring systems to facilitate excavation of contaminated soil and groundwater during remediation projects. This past January Gerry Parrott, Regional Vice President of Hemmera’s Ontario Region, delivered a presentation at Toronto’s SMART Remediation Conference. The focus of his presentation was on the challenges, adaptations, and unique strategies employed by the Ontario team, in partnership with Claybar, at a challenging site in southern Ontario.
Excavating impacted soil and entrained groundwater along property lines with adjacent underground utilities can be complex and often requires access to adjacent off-site properties. Gerry’s presentation focused on a recently completed Hemmera project that involved the field team’s use of sliding rail shoring to remediate impacted soil and entrained groundwater along the property line of the site, as well as up to 6.5 metres below the surface between two buildings positioned approximately 15 metres apart. He demonstrated how the sliding rail shoring system was modified to enable installation of a contiguous vertical liner situated directly on the property line. Gerry explained the advantages of this unique liner installation method, its successful implementation at multiple job sites, its low cost in relation to traditional shoring systems, and how often complex technical and legal issues associated with accessing off-site properties can be avoided entirely. Gerry’s presentation also identified the limitations of this modified use of sliding rail shoring systems.
Gerry also showed how the team underpinned the building and uniquely excavated approximately 1.5 m under the building and 5 m below ground surface while using horizontal rods to hold up soil behind the foundation wall.
To demonstrate the benefits of this application, Gerry then contrasted the time and cost of conducting this work with traditional shoring systems, discussed property line implications, and outlined the options and outcome if no shoring was employed on the property.