COQUITLAM ULTRAVIOLET DISINFECTION FACILITY GEOTECHNICAL INVESTIGATION, DESIGN AND CONSTRUCTION CHALLENGES

Anthony Fuller, Naresh Koirala

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Problematic Soils and Ground Improvement III / Sols problématiques et amélioration du comportement III

ABSTRACT: Metro Vancouver (MV) manages and supplies drinking water for the 2.4 million residents in 21 municipalities of the Water Quality, in 2014, MV upgraded the treatment facilities in The City of Coquitlam with ultraviolet (UV) disinfection. The constraints at site for the new facility included adjacent slopes with a history of instability; the nearby Coquitlam River and an operating chlorination plant, as well as other infrastructure, in close proximity to the proposed facility. The geotechnical design and construction challenges presented by these constraints were significant. The final design had a smaller overall footprint compared to similar facilities, but deeper underground structure. Excavations up to 17 m in depth within a varved, non-plastic silt required careful design, extensive dewatering, and shoring. The paper discusses the geological and physical site conditions, the surface and subsurface investigation completed to characterize the soil and groundwater conditions and the geotechnical design and construction of the works.

RÉSUMÉ: Le Metro Vancouver, MV gère et fournit de l'eau potable pour les 2,4 millions de résidents répartis dans 21 municipalités du Lower Mainlanden 2014, MV a renouvelé les centrales de traitement des eaux dans la ville de Coquitlam avec un système de purification à base de rayons ultraviolets (UV). Des contraintes sont associées à la localisation du site: des pentes adjacentes ayant des antécédents d'instabilité, la Rivière Coquitlam à proximité, ainsi que la présence de plusieurs établissements et conception et la construction. La conception finale a une empreinte globale plus petite comparée à des installations similaires, mais possède une structure souterraine plus profonde. Des excavations jusqu'à 17 m de profondeur dans un silt varvé et non-traite des conditions géologiques et physiques du terrain, de la caractérisation des conditions de sol et des eaux souterraines, ainsi que de la conception géotechnique et la construction des ouvrages.

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