Standard&Poor's Ratings Services affirmed its 'AA-/A-1+' rating on Irvine, Calif.'s Assessment District variable-rate demand bonds series 97-16, 94-15, and 94-13, due to the bank facility being extended to Nov. 2, 2015. The long-term and short-term components of the rating are based on the rating on the letter of credit provider, State Street Bank and Trust Co., Boston, Mass. Criteria: Methodology And Assumptions: Approach To Evaluating Letter Of Credit-Supported Debt, July 6, 2009