NEW YORK (Standard&Poor's) Aug. 6, 2009--Standard&Poor's Ratings Services has assigned its 'AAA' rating to the District of Columbia's income tax revenue refunding bonds, series 2009C. At the same time, Standard&Poor's affirmed its 'AAA' rating on the district's series 2009A and B bonds. The outlook is stable. The bonds are secured by a statutory lien and pledge on the trust estate, consisting primarily of income tax revenues and business franchise taxes (income taxes) generated in the district and received by the collection agent, trustee, or district in any fiscal year. "In our opinion, the 'AAA' rating reflects the district's strong coverage of debt service by pledged revenues and our expectation of maintenance of strong coverage,"