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6 Preliminary Design Guidelines <br />6.1 New Roadways <br />New private roads will be constructed as part of this project to service the lots in the <br />development. All new road construction is subject to Title 12 of the Kittitas County Code. <br />Table 12-1 from the County Code is included below, indicating private road minimum <br />design standards. <br />T&W 12^1 <br />Prlvsta Raatl salesman Ospn 311tomnds <br />DrlvsraPdvaM <br />Dsslpl 60rrwes <br />d <br />Reads <br />M m <br />• 5.01 <br />Lew Dan <br />m <br />Number of Lob Served 1 2 <br />3-14 <br />15-40 <br />40.0 <br />WldM 0 20 <br />40 <br />90 <br />60 <br />3.404 <br />Pthaved mmenl <br />WA WA <br />R d <br />'d <br />'d <br />SO <br />Roe Width a 12 <br />20 <br />22 <br />AASHTO <br />R 'd <br />20 <br />tl 6tmultln Wi WA WA <br />1 <br />1 <br />AASHTO <br />"'I'm d <br />Minimum Centarl4le (7atlWa 3 NIA WA <br />30 <br />60 <br />1 <br />Surfs R 4emenuPl Gravel Gravel <br />Gravel <br />BST/ACP <br />AASHTO <br />AASHTO <br />&0 <br />Minimum Crushed Sol Dand, N/A 6' <br />8- <br />Grevel <br />M Wmum Graft %01 <br />S' <br />AASHTO <br />3^ <br />Flat WA WA <br />g <br />a <br />S <br />Rolfina WA WA <br />12 <br />12 <br />12 <br />12 <br />Mcumalnous WA WA <br />12 <br />12 <br />12 <br />County Rued Approach Permit Re 'd 'd <br />R d <br />R v <br />Read <br />S Ste Clarence N/A NM <br />AASHTO <br />AASHTO <br />AASHTO <br />R 'it <br />AASHTO <br />Entering She Distance WA WA <br />AASMTO <br />AASHTO <br />AASHTO <br />ApSHTO <br />Ditch 3 handle el ea & <br />er then 2'.1 should sin be usad when arhlavin a 21 slo <br />is im caval <br />"'Residual Iola within a Proposed developmeru Men not ee ccnaldered When computing evemge lot alta <br />ftngpwer Oeaipn per AASHTO and/or WSDOT required W 404 High-Denslly lets <br />aAppeae b all roads social esialing paved metlwey <br />"Al"1 01 `0114 ya serving three or more Iota shell eche" qa : Wmpadlon and <br />be <br />surfW 6 <br />shell 'Mill <br />&`C certified by a licensed engineer poor w <br />A variance request d; laguired for Wades above 12%. <br />6.2 Existing Roadways <br />Mitigation to address the impact of a new development on the existing road network is <br />required where the impact results in a level of service below County standards. <br />Nelson Siding Road and the intersections at 1-90, as they exist, have excess capacity and the <br />level of service at these locations will remain above the level of service standard established <br />for rural areas, LOS -C. Thus, no improvements to the existing road network will be <br />required. <br />Marion-Springtree Developments 12 June 2007 <br />Transportation Impact Analysis <br />010090 <br />