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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 <br /> Tower are in <br /> average to poor <br /> condition,with <br /> some showing <br /> significant rust and <br /> expansion. <br /> e <br /> l <br /> i <br /> i <br /> • <br /> 23. Close up of one of <br /> the outside steel <br /> plates. It appears <br /> as though water <br /> has corroded th <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,inc. <br />