NEW GLOUCESTER — Selectmen agreed Thursday to raise the town’s mill rate for 2010-11 by more than 11 percent.

At a special meeting held at the Community Building, the five-member board set the rate, then went into executive session with the town attorney.

The board unanimously adopted a mill rate of $12.96 per $1,000 of property, an increase of $1.38 for fiscal year 2010-11.

Tax bills will be mailed with payments due on Oct. 8.

A team of contracted assessing agents worked this past month to complete the town’s commitment in the absence of full-time Assessing Agent Nancy Pinette, who is on medical leave.

The town must raise $5,797,364 to pay its share of SAD 15, municipal costs and Cumberland County tax. The Pineland Center Tax Incentive Financing agreement will bring $225,600 into a segregated account, which the town can use to pay for costly items from the impact of the development at Pineland.

The town’s total valuation is $464,528,690, an increase of $4,213,000.

Following that action, the board moved into executive session with Portland-based town attorney Pat Scully of Bernstein Shur to discuss three separate issues, each with no action taken.

A fourth executive session followed to review Town Manager Sumner Field III’s performance. Again, no action was taken, said board Chairman Steve Libby.

After each closed session item, the board came out of executive session without taking action.

The first item dealt with the board’s legal rights and responsibilities dealing with pending or contemplated litigation, settlement offers and duties of the town’s attorney to guide the board where premature general public knowledge would place the town at a substantial disadvantage.

A second closed session dealt with negotiations with Time Warner, the town’s cable television provider, with no action taken.

A third issue discussed privately was the assessor’s agent. Scully said that employee Nancy Pinette, who is on medical leave, was not required to be noticed about attending the meeting since it did not deal with any complaint or disciplinary action.

Town Manager Field said by telephone earlier that the purpose was to discuss the position, not the person. “It’s better to be proactive,” he said.

Pinette said earlier Thursday by telephone that she was not aware that the issue was on the board’s agenda.