Residents of Richmond's worst public housing project are taking their concerns about deplorable living conditions to the federal government. An Oakland law firm is working with residents of the 150-unit Hacienda development, many of them seniors and people with disabilities, to file a complaint with the U.S. Department of Housing and Urban Development. In the coming weeks, the firm's lawyers will be talking to Hacienda residents to gather stories and documentation to put in a formal complaint with HUD, which oversees the nation's public housing. Ruined possessionsResidents who have lost possessions because of problems such as roof leaks or have health troubles as a result of their living conditions could be entitled to money, said Meredith Brown, another attorney at the firm. At a City Council meeting last week, the Housing Authority's executive director, Tim Jones, admitted that Hacienda was uninhabitable and said he was pushing to have it torn down. The city also has hired outside contractors to visit all the public housing units in Richmond starting this week to find problems and ask residents about their past maintenance requests.