Earth Day Event: Volunteers Needed April 21, 2014 Each spring, as part of its Earth Day observances, the Raritan Headwaters Association organizes clean-up programs along the banks of streams and rivers across the region. RHA’s 24th Annual Stream Clean UP will be held on Saturday, April 26th from 9am to 12pm, and Mine Hill Township will be joining at the Mine Hill Beach parking lot. Volunteers of all ages are invited to join the efforts. Click here for more information.