ATLANTIC CITY — Advocates fear that a proposed move from city officials could put a significant dent in the progress made over the past several years in reducing the number of HIV-positive residents. A number of individuals and organizations held an event Tuesday at Firefighters Memorial Park in support of keeping the needle exchange program up and running at a permanent, fixed site, as city leaders debate the future of the social service. "We are hopeful that we could work out a new location with the city government, and we're hopeful that they will recognize the value of the program," said Carol Harney, CEO of the South Jersey Aids Alliance, which has been providing syringe access services since 2007 when a city ordinance granted permission for such a program.