The Placer County Board of Supervisors will hold public hearings Tuesday, Sept. 13 on a proposed $765.8 million final budget for the 2011-12 fiscal year and on a redistricting map that could establish the boundaries of supervisor districts for the next decade.

Tuesday’s meeting will be held at 9 a.m. in the Board of Supervisors Chambers at the County Administrative Center, 175 Fulweiler Ave., in Auburn. The public hearing on the redistricting map is scheduled for 10 a.m. and the hearing on the budget is set for 11 a.m.

Placer County has been working on redistricting since 2010 census numbers were released in January.

On Aug. 9, the board reached consensus on a base redistricting map, choosing among five alternatives. At their Aug. 23 meeting, board members settled several lingering boundary issues and directed staff to prepare a final map showing proposed boundaries of the five supervisor districts.

Tuesday’s hearing will be the first of two public hearings the board will hold on the proposed final map. The second hearing will take place on Oct. 11 before the board makes final decisions on district boundaries.

As required by state law, the five board members are realigning district boundaries to reflect population changes reported in the 2010 Census. Over the past ten years, the county has added more than 100,000 residents, giving it a total population of almost 350,000 people.

Populations in the five districts cannot vary by more than 10 percent under one-man, one-vote provisions of the 1965 U.S. Voting Rights Act. In developing redistricting maps, Placer County also is relying on geography, cohesiveness, compactness of territory, communities of interest and other criteria outlined in the California Elections Code.

During Tuesday’s budget hearing, the board will take public comment on the county’s proposed final budget and direct staff to make any necessary changes before final consideration on Sept. 27.

Placer County develops its budget in two phases each fiscal year.

On June 7, the board adopted a $720 million proposed budget so the county had a spending plan in place when the 2011-12 fiscal year began July 1.

The two-phase approach allows Placer County to wait until September to adopt a final budget that includes updated revenue and expenditure estimates.