The Ridgefield Conservation Commission is looking to hire paid summer workers. The positions are for a period of 8 to 10 weeks starting June 1st.   Applicants must be at least 18 years old and have a valid driver’s license. Officials say knowledge of town open spaces and trails is a plus and experience with mowing, weed whacking, and light carpentry is desired.  Some of the tasks include clearing tree blowdowns, repainting blazes that mark the trails, installing signs at trailheads so that they can be easily found by new hikers, removing invasive plants and building small bridges to ease difficult stream crossings.  Applications can be sent to Ridgefield Human Resources at Town Hall by April 30th.