LOS ANGELES, Calif. — Mark Pestrella, Los Angeles County Public Works Deputy Director, Zev Yaroslavsky, Los Angeles County Supervisor, and Col. Mark Toy, U.S. Army Corps of Engineers Los Angeles district commander (left to right), ceremonially turn dirt Feb. 22 for the start of the $7 million Tujunga Wash Ecosystem Restoration project that will extend greening along the sides of a 3/4-mile stretch of concrete channel in the San Fernando Valley that carries runoff from Hansen Dam to the Los Angeles River.