Los Angeles County Public Works Deputy Director Mark Pestrella, Los Angeles County Supervisor Zev Yaroslavsky and Los Angeles District Commander Col. Mark Toy 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.