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Riverstone SouthEAWDraft December 2020 <br />The northbound left-turning movement at the new Highway 10/Riverdale Drive intersection will <br />experience future delays with and without the traffic generated by the proposed project. The cross- <br />street traffic volumes predicted at this location do not meet signal warrants, so an at-grade, ¾-access <br />intersection is recommended. All other intersections are predicted tocontinue to operate acceptably <br />through the 2040 build scenario. <br />The Highway 10/Riverdale Drive intersectionexperiences excessive delays and queueing under the <br />proposed side-street stop control operations during both AM and PM peak hours. All other <br />intersectionsoperate within acceptable bounds with no delays or queueing concerns arising through <br />the 2040 build scenario. Additionally, all site corridors operate with volumes within their planning <br />level capacities through the 2040 build scenario. <br />c.Identify measures that will be taken to minimize or mitigate project related transportation effects. <br />The Traffic Impact Study recommendsconstruction of the Highway 10/Riverdale Drive intersection <br />to a ¾-access (Appendix G). This configuration removes the cross-street left turning movement <br />(northbound left) from the intersection and improves the traffic operations to acceptable timing.This <br />reduction in queueing and delay is a result of rerouting the highest delayed movement (northbound <br />leftturning movement) away from the Highway 10/Riverdale Drive intersection to alternative routes. <br />Vehicles that would normally navigate northbound to westbound at this intersection would instead <br />travel east on Riverdale Drive to the Armstrong Boulevard/Northern Highway 10 Ramps, where they <br />would take a northbound left to proceed westbound. In total,roughly 2.25 miles would be added to <br />their commute with this change. Very few trips are affected by the northbound left turning <br />movement at this location. Existing traffic counts estimate that fewer than 60 vehicles completethis <br />movement each day. <br />Additionally, pedestrian and bicycle infrastructure upgrades are recommended with trail connections <br />to existing facilities along Riverdale Drive east of Llama Street and the existing trail south of <br />Highway 10 by Bowers Drive. <br />19.Cumulative Potential Effects <br />Preparers can leave this item blank if cumulative potential effects are addressed under the applicable EAW <br />Items. <br />a.Describe the geographic scales and timeframes of the project related environmental effects that could <br />combine with other environmental effects resulting in cumulative potential effects. <br />Itis anticipated that the project areawill develop over the next3 to 5 years, but the actual timing of <br />development could vary depending onthedemand for housing and market conditions. Seven other <br />projectsproposed in the City of Ramseyare expected to develop during this time period. These <br />projects and their geographic locations are described under Item 19.bbelow. <br />30 <br /> <br />