Streambed Alteration Agreement Concerning a Tributary to the Pacific Ocean

Streambed Alteration Agreement Concerning a Tributary to the Pacific Ocean

The work covered by the steambed agreement includes maintenance work within and adjacent to the outfall of the Palos Verdes Reservoir emergency spillway, and construction of a paved access road that will allow regular maintenance. Maintenance will consist of clearing all accumulated sediment and vegetation from within the 370' x 36' spillway. The initial clearing will be followed by regular maintenance to prevent future obstruction of the spillway. During clearing activities, existing flows will be temporarily redirected from the work area by constructing a sandbag dike which will divert flows into a 6-inch diameter conduit from the upstream culvert to the downstream culvert. The total area of wetland impact is 0.31 acre. The wetland consists primarily of riparian woodland dominated by willow, but also includes several non-native plant species. Mitigation will consist of 1.0 acre of mitigation credits purchased from the Mountains Recreation and Conservancy Authority's in-lieu fee program. The need to maintain function of the spillway precludes retaining vegetation on-site.

Rolling Hills Estates

Los Angeles