Route 56" group was commissioned to work on the funding issues. Two years later, County Supervisor Pam Slater briefly proposed making SR 56 a toll road in order to raise funds for construction. The city of San Diego agreed to pay $25 million (about $ in dollars), and the state indicated that it would contribute $20 million. Highway 680 was a planned county route that would have run from Encinitas to Rancho Bernardo. The San Diego County Board of Supervisors cancelled the plans in February 1994, respecting the wishes of the city of Encinitas. There were concerns that some of the traffic from this proposed route would now travel on SR 56 instead. On May 17, 1994, $20 million (about $ in dollars) allocated to Highway 680 was given to the SR 56 project. In January 1998, the State Transportation Improvement Program approved a $245 million allocation (about $ in dollars) for the expansion, and hopes were to finish construction by 2000, with traffic projected to decrease by 20 percent on I-15. There were environmental concerns that fostered consideration of four northern alternatives. One of them was chosen in June 1998 by the San Diego City Council, amid concerns that by moving the route away from "environmentally sensitive canyons", the freeway would be closer to residences. Some of those living in Rancho Glens Estates sued the city over these concerns in August. Construction began on the missing portion of SR 56 on October 21, 1999, amid allegations of a missing Army Corps of Engineers permit, at an estimated cost of $111 million (about $ in dollars). The California Coastal Commission approved the extension on May 10, 2000, after residents lost two lawsuits relating to the proximity of the freeway. Caltrans was required to install a drainage system because of the wetlands; this requirement was similar to a court ruling for a project in the Bolsa Chica Ecological Reserve. At this time, the completion was estimated to occur in 2004, at a cost of $151 million (about $ in dollars). In October 2000, Carmel Valley Road was extended to Black Mountain Road, providing a paved alternative until SR 56 was completed; commuters had to travel on a unpaved road, one of the only roads between I-5 and I-15 in North County. Local developers contributed $21 million (about $ in dollars) for the construction of the interchange at Camino Ruiz, and construction