Medford (Mass.) Retirement System issued an RFP for a manager to run a $22 million enhanced S&P 500 index portfolio for the $145 million pension plan, confirmed Tina Rapatano, board administrator. Ms. Rapatano referred questions to Martin Coughlin of New England Pension Consultants, the system's consultant, who was not available for comment at press time. The RFP is available by e-mailing at [email protected] by Jan. 19. Proposals are due by 4 p.m. EST Feb. 6.