The Concordia Board of Aldermen will meet on Monday evening.  Discussion of bids for various projects are on the agenda including a bid for materials and labor to upgrade the city’s siren system to narrow band, opening of bids for harvesting of hay and a bid for pavement maintenance repair.  The aldermen will also consider the purchase of a boat for use by the water department in treatment procedures.  The meeting is scheduled to begin at 7:00 p.m. at the community building.