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~ <gl{3D.500. hO IL!dJ PUBLIC NOTICE US Army Corps of Engineers Omaha District Corps ill No: 200280762 / Project: Moffat Collection System EIS Applicant: City and County of Denver Issue Date: September 15, 2003 PUBLIC NOTICE ENVIRONMENTAL IMPACT STATEMENT U.S. ARMY CORPS OF ENGINEERS The u.s. Army Corps of Engineers (COE) is preparing an Environmental Impact Statement (EIS) to analyze the direct, indirect and cumulative effects of a water supply project (Moffat Collection System Project) by the City and County of Denver, acting by and through its Board of Water Commissioners (Denver Water). Denver Water is responsible for providing reliable, high quality drinking water to over 1.2 million customers. Through Denver Water's Integrated Resources Plan (IRP), developed in.1997 and updated in 2002, and recent events, Denver Water identified four needs in the Moffat Collection System that have to be solved. The Moffat Collection System Project will provide a solution to the following needs: The Reliability Need: Existing water demands served by Denver Water's Moffat Collection System exceed available supplies from the Moffat Collection System during a drought, causing a water supply reliability problem. In a severe drought, even in a single severe dry year, the Moffat Treatment Plant-one of three treatment plants in Denver's system-is at a significant level of risk of running out of water. The Vulnerability Need: Denver Water's collection system is vulnerable to manmade and natural disasters because 90 percent of available reservoir storage and 80 percent of available water supplies rely on the unimpeded operation of Strontia Springs Reservoir and other components of Denver's Water's South System. The South System is comprised of the Roberts Tunnel Collection System (including Dillon Reservoir) and the South Platte Collection System. The Flexibility Need: Denver Water's treated water transmission, distribution, and water collection systems are subject to failures and outages caused by routine maintenance, pipe failures, treatment plant problems, and a host of other unpredictable occurrences that are inherent in operating and maintaining a large municipal water supply system. These stresses to Denver Water's ability to meet its customers' water supply demands require a level of flexibility within system operations that is not presently available. ",-,,;...-:'--:. The Firm Yield Need: Denver Water's near-term water resource strategy and water service obligations that have occurred since the IRP was developed, has resulted in a need for 18,000 acre-feet of new near-term water supplies. This need was identified after first assuming successful implementation of a conservation program, construction of a non-potable recycling project, and implementation of a system refinement program. 1