Kitsap Transit will pile sand and gravel on a few beaches in early fall to see how much a passenger-only ferry boat will take away. It’s part of the agency’s attempt to bring back the half-hour commuter run between Bremerton and Seattle. The study, which could begin in late September, is designed to measure the impact of ferry wakes left by a newly designed ferry. It also would determine whether renourishing an affected area is a viable way to repair ongoing beach damage from vessel wakes. For the study, sand and gravel approximating what’s already on each beach will be loaded onto the shores from barges during high tide, then graded at low tide. Most of the property owners affected by the new material already have given their approval for the test, Hayes said.