01-27-2014 Council Packet - Laserfiche WebLink

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G�X�-��ZT- C.�- • = BO LTON 8� M � N K , I N C� . Consuiting Engineers & Surveyors " 2035 County Road D East• Suite B• Maplewood, MN 55109-5314 Phone(651)704-9970• Fax(651)704-9971 www.bolton-menk.com MEMORANDUM Date: January 6, 2014 To: Jesse Struve, PE - Orono Public Works Director From: Douglas Klamerus, PE CC: Dave Martini, PE; Seth Peterson, PE Project: North Water Tower Rehabilitation Re: Alternative Rehabilitation Options Background In 2014,the City of Orono is planning for the rehabilitation of the North Water Tower. The existing tower is a 0.4 MG fluted column tank constructed by Pittsburg-Des Moines in 1992. The existing coatings are original to the tank. Based on an evaluation conducted by SEH in December 2012,the following items should be included in the rehabilitation scheduled for 2014: • Interior Wet Coatings: Complete removal and replacement of the interior wet coating system. Caulk the roof beams and seams as required. • Interior Dry Coatings: Spot repair areas of corrosion with either abrasive blasting or power tool cleaning. Completely remove the coatings on the access tube and bottom of the bowl and replace with a coating system similar to the interior wet. As shown by the amount of corrosion present in these two areas, these specific areas are fairly corrosive due to high levels of condensation and can benefit from a higher level of protection. • Exterior Coating: Spot repair any areas of corrosion or coatings failures with power tool cleaning to SSPGSP3 condition. After spot repairs and surface preparation, apply an overcoat system comprised of one epoxy and one polyurethane coating system. • New overflow discharge screen • New frost free vent • New double LED obstruction light • Replace logo There are two common approaches to tower rehabilitation which are outlined below: Design-Build With a design-build approach, the owner directly selects a contractor to complete an agreed upon scope of work for a predetermined fee. Selection is primarily made based on quality of service as the traditional low bid process is avoided. The typical owner-engineer-contractor process is also avoided since the engineer in the design-build method is no longer an independent party, but rather teamed with the contractor. Typically, there is less inspection oversight in this arrangement since the contractor's workforce performs their own quality control testing. G'\Orono\010614 struvememo.dota DESIGNING FOR A BETTER TOMORROW Bolton&Menk is an equal opportunity employer You created this PDF from an application that is not licensed to print to novaPDF printer(http://www.novapdf.com)