A federal lawsuit alleging the Baltimore harbor is being polluted by the city-backed construction of the Horseshoe Casino has been dismissed.

U.S. District Court Judge Richard D. Bennett ruled that the city resident who sued lacked legal standing to bring the case. Mark E. Richardson and another man filed suit in July accusing the city of violating the federal Clean Water Act by allowing toxic chemicals to leach into the Middle Branch of the Patapsco River from the city-owned former chemical plant site on which the casino is being built. They sought only token monetary damages, asking mainly for an injunction to require a more extensive cleanup of the site.

Richardson, who lives in the Federal Hill area, and the second plaintiff, Edward J. Meyers of Glen Burnie, had said they live near the river and "regularly use and recreate on and around" it. Meyers withdrew from the case last fall. The judge found the plaintiffs' connection to the river and specifically to the waters near the casino site "vague" and insufficient to show harm. He granted the city's motion to dismiss.

At least two other lawsuits alleging casino neighbors are being harmed by inadequate cleanup are still pending in federal court.