A proposed RV park and campground cleared its first hurdle Tuesday, with the Inland Wetlands and Watercourses Commission voting 3-2 to approve the scaled-down but still controversial project on 65 acres of land owned by the Mashantucket Pequot Tribal Nation at the junction of routes 2 and 164 and abutting Avery Pond. Maryland-based Blue Water Development Corp. has proposed the RV park and campground resort under the name Blue Camp CT LLC, on three parcels owned by the Mashantuckets at 451, 455 and 495 Route 2. The project has been revised several times in response to concerns from residents and the town’s consulting engineers and was estimated in March to cost $18.5 million. Blue Water has downsized the project to 280 campsites, eliminated the dock, boardwalk, tent sites along the pond and one bathhouse. The PZC public hearing will continue at the commission’s April 26 meeting at 7 p.m. at Preston Plains Middle School.