Michael J. Graveley, Graveley Roofing Corporation v. City of Philadelphia, Minority Business Enterprise Council,elizabeth Reveal, As Director of Finance for City Ofphiladelphia, Curtis Jones, Jr. As Director of Minoritybusiness Enterprise Council; Angela Dowd Burton, As Com'r Ofdept. of Procurement of City of Philadelphia, 172 F.3d 40 (3d Cir. 1998)