After being placed on administrative leave, Bethel's Public Works Director has resigned.  Doug Arndt held the position for nearly 5 years.  First Selectman Matt Knickerbocker has not commented on why Arndt was placed on leave, or why he volunteered to resign.  Knickerbocker told Hearst Media that it was time for a change for both Arndt and the town, but noted that he did a lot of good work overseeing various water projects and intersection realignments.  Assistant public works director and highway superintendent Bob Dibble is filling the role on an interim basis.  The job opening post says Bethel is seeking a director with a professional engineer license who has management experience.  Knickerbocker said in the published report that the new Director would focus on building maintenance and highway planning, as well as using technology to analyze how the town could save on vehicle costs.