NEW YORK (Standard&Poor's CreditWire) Aug. 20, 1999-- Standard&Poor's today reinstated its triple-'A'/'A-1' rating on Allegheny Hospital Development Authority, Pa.'s $118.2 million health center revenue bonds series 1990A-D, issued for Presbyterian-University Health System Inc. The rating has been reinstated following the receipt of the standby bond purchase agreement provided by PNC Bank N.A., extending until Feb. 22, 2000, Standard&Poor's said. -- CreditWire