After engineers spent most of Saturday trying to break a large slab of sandstone from the Rimrocks, a separate chunk broke free about three miles to the west above 38th Street West and Laredo Place.
The slab broke off at about 7:15 p.m. Saturday above 38th Street West and Laredo Place. The rock fall brought a number of other smaller boulders down with it.
The chunk of sandstone doesn't appear to have damaged any homes, but some of the homes in the area may be evacuated for safety.
The rock fall is about three miles west of a site above Granite Avenue where Accurate Concrete Cutting of Vancouver, Wash., spent Saturday trying to free a 340-ton slab of sandstone from the Rimrocks there.
The crews worked from 10 a.m. to 6 p.m. using hydraulic jacks to push the top of the slab nearly nine feet, but the rock hadn't broken free by Saturday evening. They plan to get back to work on that project at 8:30 a.m. Monday. That slab is part of a massive rock fall that destroyed a house at 1313 Granite Ave. last October.