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<br />following graph. The magnitude of the EPA-projected reductions is so great (even <br />after accounting for ADT growth) that MSAT emissions in the study area are likely to <br />be lower in the future than they are today. <br />NATIONAL MSAT EMISSION TRENDS 1999 - 2050 <br />FOR VEHICLES OPERATING ON ROADWAYS <br />USING EPA's MOBILE6.2 MODEL <br />i~ooa~ <br />y, lUUUUU <br />H <br />C <br />0 <br />•~ <br />W .r3~ n~~ <br />~~`' ~ <br />~~~ <br />~' <br />r~ <br />r ~' <br />~r <br />.'' <br />J r <br />R.~ <br />r~ <br />r'' <br />~~ <br />7 <br /> <br />5 <br />L <br />si <br /> <br /> <br />zooo ~oia 70~o ao3o zoaa <br />Cal endar Year <br />~' Q <br />Soso <br />Note: <br />(1) Annual emissions of polycyclic organic matter are projected to be 561 tons/yr for 1999, decreasing <br />to 373 tons/yr for 2050. <br />(2) Trends for specific locations maybe different, depending on locally derived information <br />representing vehicle-miles travelled, vehicle speeds, vehicle mix, fuels, emission control programs, <br />meteorology, and other factors <br />Source: U.S. Environmental Protection Agency. MOBILE6.2 Model run 20 August 2009. <br />The U.S. Environmental Protection Agency has designated all of Hennepin, Ramsey, <br />Anoka and portions of Carver, Scott, Dakota, Washington and Wright counties as a <br />maintenance area for carbon monoxide. The 171st Avenue AUAR study area is in <br />Sherburne County and thus not in the carbon monoxide maintenance area. <br />Furthermore, the EPA has approved a screening method to determine which <br />intersections need a hotspot analysis. A hot spot analysis is required if the <br />intersection is above the benchmark average annual daily traffic (AADT) threshold <br />of 79,400 or listed as one of the "Top Ten" intersections. All of the top ten <br />intersections are within the Twin Cities carbon monoxide maintenance area. Below <br />is a list of the top ten intersections and their 2007 AADT. <br />City of Elk River <br />Draft Alternative Urban Areawide Review <br />August 2011 <br />Page 79 of 90 <br />l <br />~i <br />u <br />