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Summary <br />This report summarizes the traffic impact analysis performed for proposed residential <br />development projects on Nelson Siding Road in Mttitas County, Washington, just south of <br />Interstate 90. The analysis considered existing roadway and traffic conditions and future <br />conditions with the Marion-Springtree development in place. <br />An inventory of existing roadway conditions was conducted in July, 2006. Traffic volumes <br />were obtained with midweek tube counts at two locations on Nelson Siding Road, one just <br />south of West Nelson Road and one just north of Westside Road. These tube counts <br />indicated that the average PM peak hour volume at location #1 is 50 vehicles, with 72 <br />vehicles at location #2. More detailed existing traffic volume data can be found in <br />Appendix A. <br />The Marion and Springtree cluster developments, anticipated to be occupied in 2008, will <br />add 23 net PM peak hour trips to the local road network. These developments will not <br />significantly affect traffic patterns and all local intersections are forecasted to remain at LOS - <br />A or better. (The Mttitas County standard is LOS -C for rural roads.) Since there is no <br />significant impact to the road network, no mitigation is necessary. Level of service reports <br />are included as Appendix C. <br />New roads built to provide access to the residential lots in both developments will be <br />required to be built according to current Kittitas County Road Standards, as cited in this <br />report. Kittitas County Road Standards are not exhaustive on road design criteria; instead, <br />AASHTO and WSDOT design criteria are included by reference. <br />Marion-Springtree Developments 1 June 2007 <br />Transportation Impact Analysis <br />G,0101 <br />