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MWMC FACILITIES PLAN system and WPCF wet weather treatment improvements. The WWFMP study determined that collection system rehabilitation programs alone could not cost-effectively reduce WPCF influent flows to the point that additional treatment capacity would not be required. If the WPCF is not improved for wet weather, MWMC facilities would still experience capacity issues and be at risk of sanitary sewer overflows. Other, more dramatic actions could include enacting new regulations that would restrict water use in the metropolitan area, or implementation of zoning changes and building moratoriums throughout the MWMC service area. To protect public and environmental health, these restrictions would need to be in place to constrain population and industrial growth in the area, thus slowing the increase in wastewater flow to the treatment facilities. While these programs would help to maintain the wastewater system and provide additional environmental protection over the short-term, they would not eliminate the eventual need to construct additional conveyance and treatment capacity for predicted long- term increases in wastewater flows in the MWMC service area. An additional option could include construction of new treatment facilities in an undisclosed location in the Eugene-Springfield metropolitan area. However, the construction of additional treatment capacity would require sizable funding, site acquisition, design, permitting, and construction. These activities would require time to complete and during this period MWMC facilities would be at maximum capacity and at risk of overflow and violation of NPDES permit conditions. 9.3.3 Biological Resources System Alternative ! would result in impacts to biological resources in the Willamette River. Impacts from the No Project Alternative would be greater than impacts from System Alternatives 5 and 4. As noted above, System Alternative 1 would increase the potential for the discharge of untreated wastewater into the Willamette River and other area waterways. This, in turn, would impact water quality and would likely result in significant degradation of the biological resources in the river downstream of the WPCF outfall. The discharge of untreated wastewater would also likely result in increased potential to harm public health. 9.3.4 Air Quality, Odor, and Noise System Alternative 1 would result in impacts to air quality, odor, and noise. Impacts from System Alternative 1 would be greater than impacts from System Alternatives 5 and 4. As the current MWMC facilities reach their capacity, increased flows during wet and dry weather conditions will result in increased releases of fugitive odors. In general, the proposed changes under System Alternatives 5 and 4 will improve odor control by capturing more fugitive odors and using odor-reducing technologies. These changes in odor control technology will greatly improve odor control in comparison to current and future operating conditions under System Alternative 1. With System Alternative 1, noise and air quality could also be impacted if the flow through the facilities approaches full capacity. Increased facility loading could mean changes in 9-6 MWMC_9.0_REVl 4. DOC