Collaborative Bidding Approach for the Tollgate Creek Interceptor

With an estimated population of 325,000, the city of Aurora is the third largest city—and one of the fastest growing communities in the Colorado. A large portion of the wastewater generated in Aurora is conveyed through the Tollgate Creek interceptor to the Metro Wastewater Reclamation District's Robert W. Hite Wastewater Treatment Facility. Installed in the 1980s, the Tollgate Creek interceptor begins in the southern portion of the city and runs north, along the banks of Tollgate Creek, to the treatment plant. The existing interceptor is reinforced concrete pipe and varies in diameter from 30 to 42 inches. The city's Wastewater Utility Plan identified the need for the additional capacity in the Tollgate system based on the 2030 planning horizon. In order to meet this goal, as well as handle all 2010 flows, the city embarked on a multi-year capital improvement program to design and construct a new interceptor parallel to the existing Tollgate Creek inerceptor. The system is designed to facilitate the diversion of all sanitary flows into the new interceptor thus enabling the existing interceptor to be inspected and rehabilitated before they were both required to be in service. Aurora Water Capital Projects Division uses a Capital Projects Delivery System that provides a simple online guide to project work flow, controls, and delivery. The tool is built on Aurora Water's best project delivery practices and was instrumental in the successful delivery of this project.