York Region mining project’s geotechnical and hydrogeological challenges overcome through the project design

Tamara Kondrachova, Susan Hansler

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Professional Practice/Case Studies

ABSTRACT: The existing regional 900 mm sewage forcemain was built about 30 years ago. Through the Environmental Assessment (EA) completed in 2013 the new forcemain will twin the existing sewer and to minimize an overall impact to the community and environment will be placed within the previously disturbed corridor parallel to the existing forcemain. The EA selected alignment has identified a number of constraints, such as: numerous crossings and proximity to the East Holland River, to railways with their bridges, to existing forcemain and to heritage buildings, construction through the public parks and areas of high public use. Most of these constraints were eliminated during Detailed Design, where the micro-tunneling construction method to minimize any disturbance to the surface has being selected. This selection was -12 mbgs vs 3-5 m for an open cut and HDD at the EA design) which, in turn, has reduced potential frac-outs to the surface and into the streams. The Project was issued for Tender in January, 2019 and awarded in April, 2019. Construction will commence in June with anticipated substantial completion by the end of 2021. Region has to implement an extent construction monitoring and reporting to the Ontario Ministry of Environment, Conservation and Parks (MECP) through the entire construction.

RÉSUMÉ: La conduite de refoulement pour les eaux usées régionale de 900 mm existante a été construite il y a environ 30 ans. Dans le cadre de l'évaluation environnementale achevée en 2013, la nouvelle conduite de refoulement sera jumelée à l'égout existant et, afin de minimiser les répercussions globales sur la communauté, l'environnement sera placé dans le corridor précédemment peruncertain nombre de contraintes, telles que: de nombreux passages à niveau et la proximité de la rivière East Holland, des chemins de fer avec leurs ponts, des conduites existantes et des édifices à valeur patrimoniale, de la construction dans les parcs publics et des zones très fréquentées. La plupart de ces contraintes ont été éliminées lors de la conception détaillée, dans laquelle la méthode de construction par micro-tunneling visant à minimiser toute projet (10-12 mbgs contre 3-5 m pour une tranchée à ciel ouvert et un dipermis de réduire les fissures potentielles à la surface et dans le fond. ruisseaux. Le projet a été lancé pour appel d'offres en janvier 2019 et adjugé en avril 2019. Les travaux de construction débuteront en juin et devraient s'achever de l'Environnement de l'Ontario, Conservation et parcs (MECP) tout au long de la construction.

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Cite this article:
Tamara Kondrachova; Susan Hansler (2019) York Region mining project’s geotechnical and hydrogeological challenges overcome through the project design in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper238,author = Tamara Kondrachova; Susan Hansler,title = York Region mining project’s geotechnical and hydrogeological challenges overcome through the project design,year = 2019}