Waltham (Mass.) Contributory Retirement System is reviewing its asset allocation to determine how to invest the city's $10 million annual contribution, which it will receive on July 1, said Joe Juppe, executive director. The current asset allocation for the $122 million plan is 46% domestic equity, 29% domestic fixed income, 12% international equity, 5% international fixed income, 4% private equity, 3% real estate and 1% cash. Changes to these targets are not likely, he said. Wainwright Investment Counsel is assisting.