NW Marine Drive/Chancellor Boulevard/East Mall Intersection Redesign : Detailed Design Report

Van Augustine Consultants proposes the construction of a single lane roundabout at the intersection of NW Marine Drive, East Mall, and Chancellor Boulevard in order to provide a safer alternative to the current nonstandard intersection layout. The single lane roundabout increases user safety by reducing vehicle speeds, reducing the number of conflict areas, and decreasing potential collision angles to angles less than 90 degrees. The new design also creates less driver confusion, and promotes sustainability by better accommodating pedestrians and cyclists. Stormwater management was a major criteria and was considered in depth during the design phase. This report builds on the Detailed Design Summary Report and Presentation delivered to UBC Campus and Community Planning February 29, 2016. A major development since the preliminary design phase was the proposal of a bike parking facility, the Bike Garden. This showcase gateway feature realizes UBC’s mission for sustainability and commitment to alternative modes of transportation. This facility provides storage for 84 bikes north of Allard Hall. The Bike Garden is a steel frame structure featuring a green roof and integration with the newly proposed stormwater management system. An Issued for Tender Structural and envelope drawing set is included in the report. In a stormwater management context, cliff erosion along the northern edge of the campus has been a major concern for UBC. Therefore, minimizing infiltration and controlling surface runoff were key design parameters. Specifically, the detailed stormwater management design provides a reduction in the volume of runoff by lowering the impervious-to-pervious area ratio through the addition of rain gardens and pervious pavers, and better collection of surface run-off by adding six new catch basins. Furthermore, the additional captured stormwater will be diverted through a Stormceptor Oil and Grit separator and to an 800m³ underground stormwater detention facility allowing for attenuation and controlled release of stormwater to the minor system during high flow events. The project team has consulted with the Langley Concrete Group and Ibrium Systems for the sizing of the Stormceptor system to ensure water quality standards are sufficient to use captured stormwater for irrigation of the on-site landscaping, the bike garden green roof, and the Rose Garden. For the detailed design of the proposal, guidance was sought from the UBC 2015 Integrated Stormwater Management Plan and the Metro Vancouver 2012 Stormwater Source Control Guidelines. The project (roundabout, Bike Garden, landscaping and drainage) is estimated to cost $1.59 million for a September 2016 delivery. In terms of construction staging, Bike Garden construction begins May 1st, 2016, and roadwork beings June 3rd, 2016. This staging avoids potential conflicts between roadwork and the traffic surges associated with the annual UBC graduation ceremonies hosted at Chan Centre situated to the immediate southwest of the subject intersection. Furthermore, the majority of all roadwork will be performed with comprehensive traffic management and only periodic detours and partial closures. The redesigned intersection will be commissioned in time for September 1st. Van Augustine Consultants will continue to involve stakeholders in the final stages of design. Crossing agreement requests will be sent to utility providers and a meeting will be setup with Metro Vancouver to mitigate any right-of-way conflicts. The project team will also seek input on the construction staging plan from the stakeholders including nearby residents, intersection users, and nearby event facility managers. Their input will be essential in ensuring that the construction of the new roundabout will be efficient and user friendly. The engagement plan involves a public open house, an online feedback forum, and the creation of the project website with information and updates regarding the project. Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC. Furthermore readers should bear in mind that these reports may not reflect the current status of activities at UBC. We urge you to contact the research persons mentioned in a report or the SEEDS Coordinator about the current status of the subject matter of a project/report.”

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