A Lake Lanier property owner is under pressure by the U.S. Army Corps of Engineers to clean up three sinking houseboats in the water across from North Hall’s Laurel Park. “We’re trying to do something, but we don’t know what we can do,” said Ann G. Krummel, a Stone Mountain resident who owns the 0.62-acre lot off Mandalay Road off Clarks Bridge Road in Gainesville. “I’ve talked to everybody I could up there and nobody seems to know what to do.”