NY-- Standard&Poor's CreditWire 3/10/97-- Standard&Poor's assigned its double-'A' rating to El Paso, Texas' G.O. improvement and refunding bonds series 1998, its combination tax and revenue certificates of obligation series 1998A, and its combination tax and hotel occupancy tax certificates of obligation series 1998 dated March 1, 1998 due Aug. 15, 2018. The bonds are scheduled to sell today. At the same time, Standard&Poor's affirmed its double-'A' rating on El Paso's $51.80 million G.O. bonds and $9.045 million taxable bonds. The outlook on the city was also revised to stable from negative. The rating on El Paso reflects the: -- Economic activity drawn to the largest U.S. city on the Mexican border, -- Stabilizing economic