Agenda Packets - 1985/08/05 - Laserfiche WebLink

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MEMO TO: Clerk -Administrator and City Council � FROM: Director of Public Works/Community Development/{u I .N DATE: July 30, 1985 SUBJECT: WATER TOWER NO. 2 (WATER TOWER ON THE. SOUTH SIDE OF THE CITY) I. Problem Statement On the coldest day of January, 1985, I noticed that some paint peeled off of the south water tower. If the problem was limited only to the peeling, I would have repainted the peeled areas by now, but during my investigation I determined that the new coating has poor adhesion to the old paint and the old paint has poor adhesion to the steel. II. Background In 1970, this 500000 gallon water tower was constructed and the original coat of paint was applied. As far as I can determine, this is the only paint applied on the water tower. In 1983, Toltz, King, Duvall and Anderson (T.K.D.A.) hired Twin City Testing to inspect the water tower and report on the tower's condition. Twin City Testing's report indicated that the exterior coating system showed evidence of localized breakdown and embrittlement on an estiCatede5 percent of the steel surfaces. Therefore, T.K.D.A. p P plans specifications for painting the water tower with complete sandblasting on the 5 percent area that was in poor condition and brush-off sandblasting for the rest of the tower. This is a fairly standard specification for painting water towers. In 1984, Odland Protective Coatings painted the water tower using Silicone -Alkyd paint perthe specification for a cost of $36,000.00. The paint contractor prepared the tank and applied the paint per the specifications. III. Discussion and Probable Cause of the Problem Possible causes for the problem include the following: 1. Thermal expansion and contraction (i.e., cold weather). 2. Bad batch of paint. 3. Poor paint preparation and/or application.