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Aggregates and Roadbuilding March-April 2017 : Page 23

required a lot of planning to make sure that everyone was not disrupted too much,” says Alex Evans, project engineer for Airports Group Transportation Practice. As an example of how much work local general contractor G&E Contracting LP had to do, it excavated and hauled away 23,000 cubic metres of soil and clay -1,800 truck and pup loads of 13 tight cubic metres -to make room for the gravel bases for the concrete and asphalt parking/de-icing facility. As many as 20 people and an assortment of excavators, trucks, milling machine, pavers, rollers and more, were on the job site on any given day. “All of our work was done under the watchful eye of airport security and escorts. At any given time, there were two to four escorts to ensure we were in the proper lo-cations and setback, away from the active taxiways. There were also active taxiways we had to cross on a daily basis. We held back when planes were taxiing,” says Mike Sedgwick, operations manager, G&E. Many parties participate in orchestrating airport projects; e.g., contractors, air-lines, NAV CANADA, airport authority and Transport Canada. “Every large project at an airport requires a plan of construction, with zones of construction and its restrictions. Some zones were close to aprons and taxiways, where contractors had to work at night. That was unique. That plan of construction is a living document that we and the airport prepare, and Transport Canada sees and approves, so everyone knows how it is to be done,” Evans explains. The Victoria Airport Authority (VAA) divided the work in two phases: Phase 1, executed between August 2015 and March 2016, included building a new, 17,000 square-metre remote parking stand that would also double as the new, main aircraft de-icing area. This was part of a plan to reduce the demand, and conflicting tasks carried out, on the apron, such as overnight parking and de-icing, preparatory to expanding the footprint of the terminal hold room by 1,400 square metres. “We have room on the apron to park 15 aircraft, and we have 14 planes [that do]. Laying new sub-drains (G&E Contracting) Some work was done at night when planes were not active. (Victoria Airport Authority) We did need more overnight parking space,” says Scott Cunningham, director of facilities for the VAA. On highway construction projects, heavy trucks track mud and rock far and wide on the asphalt. On airport projects, however, where hugely expensive and debris-sensitive planes roll, this is not acceptable. To help prevent mucking up the taxiways and apron as its trucks came and went from the excavations, G&E built an access road of six-inch (150 millimetres) clear crushed rock laid down on geotextile cloth over the soil and clays. The crushed rock helped clean fine gravel and muck off the tires. It was very successful, with some additional maintenance required. “We had to ensure the taxiways were very clean and clear of debris, which meant there was constant sweeping,” Sedgwick explains. Since the airport land is federal prop-erty, First Nations were called in to monitor and review the topsoil removal for things like hidden middens and ar-tifacts. “We’ve been involved in projects where we’ve uncovered burials, tools, arrow heads – lots of stuff, including bodies,” Sedgwick says. But this time, nothing was found. G&E’s key excavators were Hitachi, models USR 25, ZX160, and XZ135. After removing the soil and clay, G&E laid down large-diameter pre-cast pipes up to 450 millimetres in diameter, PVC pipe up to 600 millimetres in diameter and oil interceptors, some buried as much as four and a half metres deep. G&E also installed a large box culvert as a large square manhole, with a motor-ized sluice gate valve on the outlet pipe, part of a new glycol collection system. Another component of the new gly-col treatment system, a 20-metre long by 16-metre wide by 0.5-metre deep, 125,000-litre capacity raised pond, was also on the Phase 1 to-do list. G&E used about 250 cubic metres of material exca-vated from the construction site to build its containment berm. APRIL 2017 | ROCKTOROAD | 23

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