Anchor Intro For the first time ever, an artist has received an award from the national organization that represents public works employees, the folks that bring you streets, bridges and sewers. Not surprizingly, that artist -- William Cochran -- produces public art murals...the most recent of which adorns a bridge in Frederick, Maryland. While in the Twin Cities recently to receive his award, Cochran and his wife Theresa wanted to see the work of local public art muralists. Jack Becker of Forecast public artworks, based in st paul, gave them a tour and mpr's mary stucky went along. The tour started at Mark Balma's fresco on the ceiling of the University of St Thomas building in downtown minneapolis .