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Prospect <br />1 l� <br />INTEROFFICE MEMORANDUM <br />TO: VILLAGE MANAGER, MICHAEL E. JANONIS <br />FROM: WATER/ SEWER SUPERINTENDENT <br />DATE: JANUARY 16, 2014 <br />SUBJECT: DEEP WELL 5 REPAIR - CHANGE ORDER #2 ($301,914) <br />BACKGROUND <br />In July 2012, the Village Board awarded a $163,165 contract to Municipal Well & Pump of <br />Waupun, Wisconsin to pull the pump from Deep Well 5. <br />The work at Well 5 entailed the removal of a 500 hp three -phase electric motor and the pulling <br />of the line shaft piping from approximately 1,100 feet below grade where the pump bowl <br />assembly sits in the aquifer. The entire depth of the deep well was televised to determine if <br />there are any defects that need to be addressed. Defects in wells are typically loose or broken <br />pipe joints, cracks or holes in piping that may allow contaminants into the well or aquifer. <br />Staff retained the professional services of Manhard Consulting Ltd of Vernon Hills, Illinois to <br />provide oversight of the rehabilitation project. At the October 2012 Board meeting, staff <br />brought forward Change Order #1 to make repairs to the well pump and to brush clean the well <br />borehole, re- chlorinate and then re- televise the well. The Board approved Change Order #1 <br />which brought the total contract award to date for Municipal Well & Pump to $203,447. <br />DISCUSSION <br />In Spring 2013, Municipal Well & Pump performed the well pump repairs. The re -built pump <br />and piping were delivered to the well site and made ready for re- installation. Prior to their re- <br />installation, Municipal brush cleaned the well borehole and re- televised the well for the engineer <br />to review. <br />Based on the re- televising; there were significant defects found in the well liner that were hidden <br />from earlier videos by the scale build up within the well. There are numerous holes in the well <br />liner caused by corrosion that developed over the years. The holes discovered were too <br />numerous to count and were of various sizes ranging from 1 inch to several inches in diameter. <br />The engineer determined that if the well pump were re- installed without any further repairs that <br />the well liner could collapse, destroy the well pump, and render the well unusable. Staff <br />directed the engineer to review repair options and obtain repair estimates. <br />Mount Prospect Public Works Department <br />The engineer recommended several courses of action; including abandoning the well, removing <br />and re- lining the well, installing a narrower lining, and the drilling of a new well. Manhard's <br />recommendation after lengthy discussion and review of the issue was to re -line the well with a <br />