Built in 1957, the 60-inch Remington Court outfall failed during storm events due to undermining of low-flow channel situated on the eastern bank of Steven Creek. The 60-inch corrugated metal pipe was undermined and corroded from the current outfall point to approximately 10 feet into the hillside. The pipe was broken into multiple detached sections that lie in the low-flow channel along with other debris, including an iron flap gate.
BKF completed alternatives analysis to mitigate significant environmental impacts, prepared construction documents and provided construction support. Environmental permitting included obtaining permits from California Department of Fish and Wildlife, San Francisco Bay Regional Water Quality Control Board, Valley Water District, and the United States Army Corps of Engineers.
The proposed design consisted of the construction of a temporary access ramp for equipment to reach the outfall pipe at the bottom of the stream bank, removal of concrete from the outfall channel, channel grading, placement of rock and erosion control fabric to stabilize the outfall channel, temporary installation of a coffer dam to prevent the stream from entering the project area, and installation of live willow stakes to revegetate and stabilize the stream banks.