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515 Little Canada Road, Little Canada, MN 55117 -'1600 <br />(651) 766 -4029 / FAX: (651) 766 -4048 <br />www.ci.1ittic- canada.mn. us <br />MEMORANDUM <br />TO: Mayor Blesener & Members of City Council <br />FROM: Bill Dircks, Public Works Superintendent <br />DATE: May 8, 2014 <br />RE: inflow and Infiltration Issues <br />MAYOR <br />Bill Blesener <br />COUNCIL <br />Rick Montour <br />John Keis <br />Michael McGraw <br />Shelly Bass <br />ADMINISTRATOR <br />Joel R. Hanson <br />Starting in the evening of April 26, the City received over 5 inches of rainfall over a three <br />day period. This rain fell on ground that was already super - saturated from the snow melt <br />and in some areas there was still frost in the ground preventing the water from infiltrating <br />deep into the ground. "Those conditions caused some minor flooding issues throughout <br />the City, but the public works staff was able to handle most of them by Wednesday, April <br />30. <br />However, Carla Lane had major groundwater issues that caused the Keller Lift Station to <br />be overtaxed and unable to stay ahead of the combined sanitary and storm sewer flows <br />corning into it. City maintenance staff had to use the Vactor and pump down the wet well <br />every four -to -six hours for the first four days and then a little less frequently through <br />Sunday, May 4. In all, staff pumped out 34 loads. Each load is estimated to be 2000 <br />gallons. I would like to take this opportunity to thank the public works staff for all of the <br />extra hours they worked to keep the sewer operating in the Carla neighborhood along <br />with all of the other issues they had to deal with. <br />The groundwater inflow has settled down now and the lift station pumps are able to keep <br />up on their own but some issues were discovered that should be addressed. <br />o The lift station wet well needs to be re -sized and there is a project for that work <br />budgeted for 2014. <br />o The 2500' of force main that conveys the sewage to County Road 82 is old 4"east <br />iron pipe that has become corroded and is not able to carry as much sewage as it <br />used to. There is a projected budgeted in 2014 for the replacement of the force <br />main as well. <br />