Worcester (Mass.) Retirement System is looking for information on private market infrastructure, according to consultant Meketa Investment Groups website. The board plans to invest $5 million to $15 million in a domestic, international or global strategy. The announcement is available on Meketas website at www.meketagroup.com/mgrCenter.php. Proposals are due by 4 p.m. EST on Jan. 9. Elizabeth Early, board administrator for the $711 million plan, did not return a call seeking additional information.