Pathmark Stores, the supermarket retailer that has been among the few chains willing to expand its presence in New York's low-income neighborhoods, has announced tentative restructuring plans that would avoid layoffs and continue normal operations during reorganization, company officials said yesterday. Pathmark, based in Carteret, N.J., said on Friday that it had reached an agreement on a restructuring with an ad hoc committee of bondholders who hold about 46 percent of the company's outstanding bonds. Officials at Pathmark, a subsidiary of Supermarkets General Holdings Corporation, said they plan to file a Chapter 11 bankruptcy reorganization plan. Bondholders are scheduled to complete voting on the plan by June 27, officials said. Upon reorganization, the bondholders would receive all of the newly issued Pathmark stock, officials said. The reorganization is not expected to lead to layoffs or affect plans to build new stores.