The Department of Water Resources plans to remove at least some of the debris at the bottom of the Oroville Dam spillway and study the structure, but just aren’t sure when they’ll have a chance to do that. The workers can’t just move into the Diversion Pool and pull out the concrete, mud and other debris that went into the water after the spillway broke Feb. 7 because water is still flowing at around 60,000 cubic feet per second and they’ll need heavy equipment to get the work done.