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HomeMy WebLinkAboutWD-6-83 CORPORATION OF THE TOWN OF NEWCASTLE PUBLIC WORKS DEPARTMENT R. DUPUIS, P. ENG., DIRECTOR HAMPTON,ONTARIO TEL.(416)263-2231 LOB UO 987-5039 REPORT TO THE GENERAL PURPOSE AND ADMINISTRATION COMMITTEE MEETING OF JANUARY 3, 1983. REPORT NO. : WD-6-83 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". . . .2 Page 2 REPORT NO. WD-5-84 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 Analysis 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. .. .3 Page 3 REPORT NO. WD-6-84 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 $165,000. Doubling this cost to provide for the special structural requirements would result in a cost of over $300,000.00. Dome Analysis 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. . . .4 Page 4 REPORT NO. WD-6-84 The dome, including an asphalt pad, protective dormer at the entrance, ventilation fan and electrical hookuptcosts, on the basis of a recently performed detailed estimate, about the same 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 i This analysis has been very valuable in that I now understand why almost all municipalities and government road authorities utilize the domed structure for storage of their sand/salt mixtures. Volumes of material are so great that alternate structures become impractical from a size, cost and structural viewpoint. 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. i 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, 1414 ff R.G. Dupuis, P. Eng. , � Director of Public Works. RGD:jco