The Somerville Board of Aldermen Thursday approved pay raises for non-union city employees. The raises will be retroactive to July 1, 2012.

The raises impact about 150 positions in city government, according to a study published in September titled, "Classification and Compensation Study for The City of Somerville, MA," which was conducted by Collins Center for Public Management at UMass Boston.

The study concluded that "the salaries in Somerville were well below the average of … comparable municipalities. One consequence of paying under the market is high turnover, which costs the City in loss of efficiency, knowledge and training."

Non-union city workers hadn't received a raise in six years, the city said.

The Board of Aldermen, however, did not bring to a vote the matter of raises for elected officials, which include the mayor and the aldermen.

It seems the Board of Aldermen had planned to vote on the matter—it was on the meeting agenda—but Board President Thomas Taylor made a motion to send the matter back to the Legislative Matters Committee for further debate and analysis.

After the meeting, Taylor said some people had expressed to him concerns about "amounts" and "categories" associated with those raises, and he wanted to send the matter back into the committee for further discussion.

According to the meeting agenda, the plan was to raise the mayor's salary from $125,000 to $145,000. It would also have raised the salaries for aldermen from $24,999 to $25,750.