The Carroll County commissioners approved yesterday a revised water and sewer master plan that makes a priority of the proposed $16 million Piney Run water treatment plant in Sykesville.

County planners drafted the revisions hoping to resolve the state's objections to the plant, a project that Commissioners Donald I. Dell and Robin Bartlett Frazier have pushed for two years. But state officials said they feared the plant would spur development in South Carroll, an area beset with crowded schools and roads.

Officials from Baltimore City and Baltimore County also have objected to the plan and criticized Carroll's record on development in sensitive watershed areas. And all eight commissioner candidates, including incumbent Julia Walsh Gouge, oppose it. Dell and Frazier lost in the Republican primary last month.

The vote on the plan was 2-1, with Gouge dissenting. "I don't believe in Piney Run and that is my main reason," Gouge said in explaining her vote.

The plant has generated strident opposition from some South Carroll residents.