NEW YORK (DAVID B. CARUSO / AP).— A settlement that could pay up to $657.5 million to more than 10,000 ground zero rescue and recovery workers sickened by dust from the destroyed World Trade Center goes before a judge Friday, and he has said he favored a settlement but planned to analyze it carefully to make sure it was fair.

Mayor Michael Bloomberg called the proposal "fair and reasonable," a sentiment echoed by one of the negotiators of the deal that was announced Thursday night after years of fighting in court.

The settlement agreed upon by lawyers representing the city, construction companies and the workers was announced by WTC Captive Insurance Co., a special entity established to indemnify the city and its contractors against potential legal action as they moved to clean up the site after the Sept. 11, 2001, terrorist attacks.

Both sides were scheduled to appear before the federal judge handling the litigation, U.S. District Judge Alvin Hellerstein, who must approve the deal along with the workers themselves. For the settlement to be enforced, 95 percent of the workers would need to agree to be bound by its terms.

The settlement would mean a postponement or cancellation of the trials tentatively scheduled to begin in May. Some of the cases scheduled to be heard first included that of a firefighter who died of throat cancer and another who needed a lung transplant, as well as workers with less serious ailments, including a Consolidated Edison utility company employee with limited exposure to the debris pile and no current serious illness.

The deal would make the city and other companies represented by the insurer liable for a minimum of $575 million, with more money available to the sick if certain conditions are met.

Most if not all of the money would come out of a $1 billion grant from the Federal Emergency Management Agency.