Wednesday, August 05, 2015

Auxiliary Spillway Construction Begins - Colliery Dams

City crews to stake and flag construction area
dig test pits to determine rock depth

The news release from the city of Nanaimo outlining the construction timelines to complete the auxiliary spillway by the Nov. 15 deadline indicate the first work starting Aug. 6 with actual excavation beginning by Sept. 15th.

The first actual work in the park is said to be done by city crews who will stake and flag the construction area and will dig test pits to determine rock depth and take soil samples. This is then followed by a very hurried tendering process which will be discussed at the Council meeting on August 10 at SHAW Auditorium at 4:30 pm.

Since this work was estimated to cost between $2.7 - $5.1 million in an earlier report I had asked Mr. Seward if we had already drilled a few test holes to determine at what depth bedrock may be encountered. It would seem that in order to calculate a reliable cost estimate that would have to be one known factor. I have had no reply to my query, which given today's press release would seem to indicate that information was not determined before guessing at the cost of this project.

If you consider this is basically a 200 foot long ditch measuring 40 feet wide and 15 feet deep, spending even $3 million seems like a huge cost, given the price in an earlier study pegged the cost of a swale at less than $1.5 million. 

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