Aspen is providing design, CEQA/NEPA, permitting, and mitigation monitoring services to Palmdale Water District (PWD) for sediment removal at Littlerock Reservoir. Located on National Forest System (NFS) lands of the Angeles National Forest (ANF), Littlerock Reservoir is a man-made feature formed by the impoundment of water by the Littlerock Dam.

Aspen is supporting the County with the environmental review and permitting of this sediment removal project. The County anticipates removing approximately 2.5 million cubic yards of sediment from Cogswell Reservoir, which is in the south-central portion of the Angeles National Forest along the West Fork of the San Gabriel River (WFSGR)