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MWMC FACILmES PLAN (e.g., drained and/or filled in). For example, native prairie wetlands in the Willamette Valley currently occupy less than 1 percent of their former area, and the remaining remnants are highly fragmented. The West Eugene area supports the greatest concentration of native prairie remnants and associated rare species in the Willamette Valley (Nelson and Beall, 1995). Wetland habitat is located within the boundaries of the major MWMC facilities, as shown in Figure 2.2.7-3. These wetland areas are limited in extent as a result of agricultural activity and commercial and municipal land use. Riparian Habitat The Willamette River, the main riparian feature in the vicinity of the WPCF, totals 187 main- stem miles and 16,000 total stream miles in the Willamette River Basin (Willamette American Heritage River Partnership, 2004). The nearly 200-mile reach of the Willamette River between Springfield and Portland has been designated an American Heritage River under the American Heritage River Initiative (Executive Order 13061; EPA, 2004). This stretch of the river flows through the three largest cities in the state: Eugene-Springfield, Salem, and Portland. More than two million people live in the Willamette basin, the fastest- growing region in Oregon (EPA, 2004). The WPCF has been discharging treated wastewater into the Willamette River from the facility at 410 River Avenue in North Eugene since beginning operation in 1984. Discharged effluent has undergone primary treatment (scum and solids removal), secondary treatment (bacterial digestion), and final processing (chlorination followed by addition of sulfur dioxide to dechlorinate) (City of Eugene Public Works Department, 2003). The facility uses an activated sludge process that consistently removes more than 95 percent of pollutants from the waste stream before wastewater is discharged into the Willamette River (City of Eugene Public Works Department, 2003). 2.2.8 Air Quality and Noise Air Quality Based on a 1997 regulatory review (CH2M HILL, 1997), "there are no significant, outstanding air quality compliance issues for the WPCF and the facility is in compliance with all Lane Regional Air Pollution Authority (LRAPA) and federal regulations." An emissions inventory was conducted to identify and describe all possible sources of air emissions found at the WPCF. Operations at the facility were reviewed, and a list of potential emission sources was developed. Calculations, prepared following EPA- approved/reviewed methodologies, were performed for the significant sources identified at the WPCF. The results indicate that the WPCF is not a major source under Title V regulations, including criteria pollutants and hazardous air pollutants (HAPs). Facilities are considered major sources if they emit more than 100 tons per year (tpy) of a criteria pollutant, and/or greater than 25 tpy of total HAPs or 10 tpy of an individual HAP. Because the facility is considered a minor source, a Title V operating permit is not required. However, EPA and LRAPA may impose additional record keeping and monitoring requirements in the future because actual annual carbon monoxide (CO) and nitrogen oxides (NO×) emissions at the WPCF exceed the 50 percent major source threshold and the potential to emit (PTE) is very close to a major source trigger level. However, under EPA 2-26 MWMC 2.0 REV23.DOC