A new underground wastewater pipeline proposed from Carson to San Pedro won support Wednesday from an administrative board for the Sanitation Districts of Los Angeles County.

At its meeting in Whittier, the District 2 board voted to certify a final environmental report for the so-called Clearwater Program. The vote was unanimous, said Don Avila, a public information officer for the districts.

The pipeline will supplement two aging underground tunnels, built in 1937 and 1958, that carry treated wastewater from Carson to outfall pipes beneath the ocean.

The project involves building a new outflow pipe at Royal Palms Beach, just west of the landslide area in San Pedro. It has been under review for the past six years.

Construction would not begin until 2016, with the peak of the work occurring in 2020.

- Kristin S. Agostoni