FAIRFIELD , N.J. , April 7 / PRNewswire-FirstCall / -- Covanta Holding Corporation ( NYSE : CVA ) will host a conference call at 8 : 30 AM ( Eastern ) on Thursday , April 22 , 2010 to discuss its first quarter results . � � The Company will release those results after the market closes on Wednesday , April 21 , 2010 . � � Our press release will also be available in the News section of the company 's website at www.covantaholding.com.