The oversight board that monitors ­Nassau County, N.Y., said the county’s proposed 2011 budget is not balanced due to risky assumptions.

In a review released Tuesday afternoon, the Nassau County Interim Finance Authority identified $234.4 million of risks in County Executive Ed Mangano’s $2.8 billion spending plan. The two largest items of concern: $100 million of bonding for tax certiorari settlements and $61 million of presumed labor concessions.

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