This contract includes the Clean Water Plan improvements to the Upper Allegheny Interceptor System. Approximately 7000 feet of new relief sewers will be installed which will include five new regulator structures at A-73, A-75, A-76, A-77 and A-78. These near surface improvements will address Combined Sewer Overflows occurring in Sharpsburg and Aspinwall. Ultimately, the new relief sewer will connect to a new dropshaft and the Allegheny River Tunnel at A-72.