6.9. SR 09-06-2011 - Laserfiche WebLink

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The internal roadway and intersections can be constructed as development occurs in the area. These roadways should have a two (2) lane cross section with turn lanes at the primary intersections. The intersections of Twin Lakes Parkway and 171St Avenue and 168th Avenue will experience delays by full development in all Scenarios and should be constructed to accommodate a signal system or roundabout in the future when traffic volumes indicate the need. • Location and traffic control at development access /driveway locations shall follow the City's Access Spacing Guidelines and be evaluated as development occurs in the area. At a minimum each location should include a left turn lane from the primary roadway. 22. Vehicle-related Air Emissions. Estimate the effect of the project's traffic generation on air quality, including carbon monoxide levels. Discuss the effect of traffic improvements or other mitigation measures on air quality impacts. Note: If the project involves 500 or more parking spaces, consult EAW Guidelines about whether a detailed air quality analysis is needed. In addition to controlling air pollutants for which there are National Ambient Air. Quality Standards, EPA also regulates air toxics. Most air toxics originate from human-made sources, including on-road mobile sources, non-road mobile sources (e.g., airplanes), area sources (e.g., dry cleaners) and stationary sources (e.g., factories). Controlling air toxic emissions became a national priority with the passage of the 1990 Clean Air Act Amendments, whereby Congress mandated that the U.S. Environmental Protection Agency regulate 188 air toxics, also known as hazardous air pollutants. The EPA has assessed this expansive list in their latest rule on the Control of Hazardous Air Pollutants from Mobile Sources (February 26, 2007) and identified a group of 93 compounds emitted from mobile sources that are listed in their Integrated Risk Information System. In addition, EPA identified seven compounds with significant contributions from mobile sources that are among the national and regional-scale cancer risk drivers. These are acrolein, benzene,l,3- butadiene, diesel particulate matter, plus diesel exhaust organic gases (diesel PM), formaldehyde, naphthalene, and polycyclic organic matter. While FHWA considers these the priority mobile source air toxics, the list is subject to change and maybe. adjusted in consideration of future EPA rules. The 2007 EPA rule mentioned above requires controls that will dramatically decrease MSAT emissions through cleaner fuels and cleaner engines. According to an FHWA analysis using EPA's MOBILE6.2 model, even if vehicle activity increases by 145 percent as assumed, a combined reduction of 72 percent in the total annual emission rate for the priority MSAT is projected from 1999 to 2050. City of Elk River Draft Alternative Urban Areawide Review August 2011 Page 77 of 90 u ii n ~i