The Loudoun County School Board adopted an $809 million reconciled operating budget for fiscal 2013 at a meeting Tuesday night, a step that board members hope will mark an end to a tedious, months-long negotiation process.

 But a conclusion to their work isn’t certain just yet. The plan, which is contingent upon an anticipated $7.9 million in additional state funds, will now go to the county Board of Supervisors for approval. The board of supervisors, which is expected to make a decision on the schools budget next week, has cautioned School Board members not to count on the state dollars.

 The school board was initially left facing a $22 million shortfall following the adoption of the county budget on April 4. Once additional appropriations and a projected state revenue increase of $7.9 million were taken into account, the number was ultimately lowered to about $12 million, schools officials said.

Loudoun Superintendent Edgar B. Hatrick III. (Loudoun County Public Schools)