Lake Cleanup to Be Ordered in Syracuse
State regulators will require Honeywell International to conduct $448 million cleanup of Onondaga Lake in Syracuse, one of nation's most polluted bodies of water; plan requires Honeywell International to conduct extensive dredging of lake bottom over next seven years to remove much of 165,000 pounds of mercury and other toxins that state says have been dumped in lake over past decades; Honeywell is responsible for cleanup because in 1999 it merged with Allied Chemical, which owned plant that state says dumped toxins in years before plant closed in 1988; state sued Allied Chemical in 1989 for polluting lake; Honeywell has suggested more limited cleanup that would cost about $237 million; Onondaga Indian nation has expressed its concerns that state's plan is insufficient; map; photo (M)