HomeMy WebLinkAboutWD-6-84CORPORATION OF THE TOWN OF NEWCASTLE
PUBLIC WORKS DEPARTMENT
HAMPTON, ONTARIO
LOB 1J0
R. DUPUIS, P. ENO., DIRECTOR
TEL. (416) 263 -2231
987 -5039
REPORT TO THE GENERAL PURPOSE. AND ADMINISTRATION COMMITTEE
MEETING OF JANUARY 3,
REPORT NO.: WD -6 -S 84
SUBJECT: ALTERNATIVES TO A DOME FOR
A SALT STORAGE STRUCTURE.
RECOMMENDATION:
It is respectfully recommended:
That this report be received for information.
REPORT:
Resolution # GPA- 857 -83, passed by Council on November 15,
1983, stated "That the Director of Public Works, in
consultation with the Chief Administrative Officer,
investigate the possibility of building a salt storage
structure of our own design and report back ".
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REPORT NO. WD -6 -84
- Information relating to this matter has been assembled and
the following is presented for Council's information.
There are three alternatives for a salt storage structure,
namely; 1. A silo,
2. A concrete or metal storage building,
3. A dome.
Other relevant information is as follows:
The Town's annual sand /salt mixture requirements at the
Hampton Yard are about 7,000 tons, which volume occupies
about 111,000 cubic feet.
Silo Anal.ysi s
As indicated previously, a silo with a capacity of 111,000
cubic feet would be required to store the Town's annual
sand /salt mixture at the Hampton Yard. Assuming a silo with
a diameter of 40 feet (cross- sectional area of 1,250 sq.ft.)
a,height of 90 feet would be necessary. This height
approximates a ten story building. Notwithstanding the
extremely high costs in construction a foundation to support
such a building, and the building itself, the following are
other factors which make such an alternative undesirable:
1. A ten story structure would present quite an intrusion
to the visual landscape of the area.
2. Filling of the structure would be very difficult and
would require costly, sophisticated equipment.
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REPORT NO. WD -6 -84
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3. Sand /salt mixtures, especially under the pressure of a
column of sand 90 feet in ,height, do not flow very
well, therefore, transfer of the sand to trucks would
be very costly.
4. Cleaning of the walls to prevent salt deterioration
would be a continuous costly maintenance problem.
Building Analysis
To store 111,000 cubic feet of sand /salt mixture in a
concrete or metal storage building at a depth of say 10 feet
would require a building with an area of 11,100 square feet.
This building would require special structural provisions so
that the pressure of the sand did not cause the walls to
buckle and collapse. Such structural provisions would be
very costly and would, at least, double the costs of a
simple structure.- We are advised that the cost of a simple
metal or concrete storage building is $10.00 to $15.00 per
square foot. At $15.00 per square foot, the building
required at the Hampton Yard, i.e., 10 feet high by about
11,100 feet square would cost 5165,000. Doubling this cost
to provide for the special structural requirements would
result in a cost of over $300,000.00.
Dome Analvsis
A prefabricated dome, as was recently erected at the Orono
Yard, has the capacity for the 111,000 cubic feet of
sand /salt mixture required, in a free standing pile. The
dome can easily be filled with the mixture, and because of
the size and clearances in the building, trucks can be
loaded with conventional equipment.
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REPORT NO. WD -6 -84
The dome, including an asphalt pad, protective dormer at the
entrance, ventilation fan and electrical hookup costs, on
the basis of a recently performed detailed estimate, about
the saine as the one installed at Orono, i.e., $100,000.00.
To allow contingencies for poor soil conditions, extra
gravel for leveling, etc., I would suggest that if this
alternative is pursued, an amount of $110,000.00 be
budgeted.
Summary
This analysis has been very valuable in that
understand why almost all eiunieipalities and
authorities utilize the domed structure for
sand /salt mixtures. Volumes of material are
alternate structures become impractical from
and structural viewpoint.
I now
government road
storage of their
so great that
a size, cost
It may be worth pointing out that even the Redpath sugar
operation in Oshawa uses a domed structure to store their
product, for similar reasons.
From the foregoing analysis, I feel confident that the domed
salt storage structure is the most practical and economical
method of housing the sand /salt needs at the Hampton Yard.
Respectfully submitted,
R.G. Dupuis, P. Eng.,
Director of Public Works.
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