Lesa C.(Maloney) formerly of Oakmont;died Monday;Aug.4;1997;in St.Margaret Memorial Hospital;Pittsburgh.  She was born Jan.5;1951;a daughter of the late Lee and Oma Malone Maloney.  She was employed by Federated Investors as a marketing representative.  She was a graduate of West Virginia University.  Survivors include her husband;John H.Senko;formerly of Fayette City;and one sister;Joyce E.Langton of Pelham;N.Y.  Friends will be received Tuesday from 7 to 9 p.m.and Wednesday from 2 to 4 and 7 to 9 p.m. in the Burket-Truby Funeral Home Inc.;421 Allegheny Ave.Oakmont.   Funeral services will be Thursday at 10:30 a.m.in the Oakmont Presbyterian Church;with the Rev.Stephen Wilson.  A graveside service and burial will be held at 1 p.m.in the Belle Vernon Cemetery.  Memorial contributions may be made to the American Cancer Society or the St.Margaret Hospital;Pittsburgh.  The Burket-Truby Funeral Home Inc.is in charge of the arrangements.