The $800 million project is divided into several phases, creating fourteen new links in the system. The system trunks, consisting of 2.7 metre concrete pipes, will collectively transport 740 million litres of raw sewage daily from York and Durham to treatment facilities in Pickering. On October 2, 2004, the province ordered a full environmental assessment of the "Southeast Collector" (in the Rouge Valley) and the "Upper Leslie Trunk"; a further 44 environmental conditions were placed on four other links in the new system.