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City of Elk River <br /> Jackson Street Water Tower Condition Assessment July 1,2015 <br /> CDG Project#15010.00 <br /> OBSERVATIONS REFERENCE PHOTO <br /> 22. The plates on the � ` <br /> outside of the Water "s <br /> Tower are in <br /> average to poor <br /> condition,with <br /> some showing eif )11 <br /> significant rust and <br /> '' <br /> expansion. <br /> ft <br /> 23. Close up of one of <br /> the outside steel <br /> plates. It appears E µ <br /> as though water <br /> has corroded the .$ <br /> backside of the <br /> plate,causing the <br /> steel to expand and <br /> bow outward,a <br /> condition known as <br /> rust jacking. <br /> 14 COLLABORATIVE DesignGrOup,,nt <br />