The proposed projects consist of a system of conveyance tunnels in Cook County, Illinois, known as Upper Des Plaines Intercepting Sewers 20, 20A, 20B, 20C and 21, and drop shafts to intercept and convey wastewater from a 65.2 sq. mile service area in the Northwest region of the Metropolitan Sanitary District of Greater Chicago to the proposed O'Hare Water Reclamation Plant. (A separate EIS has been prepared on the O'Hare Water Reclamation Plant). Upper Des Plaines Intercepting Sewers 20, 20A, and 21 will also intercept and convey flows from combined sewer outfalls presently discharging to Weller's Creek and Feehanville Ditch and will provide partial storage of the combined wastewater for later treatment at the proposed O'Hare Water Reclamation Plant. A summary of environmental impact, and adverse environmental effects is given in Volume 1 of a two-volume statement.