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WILLOW GLENN IV TRAFFIC SCOPING LETTER Technical Memo 8730 Tallon Lane NE, Suite 200  Lacey , WA 985 16  Office 360.352.1465  Fax 360 .352.1509  scjalliance .com TO: Denny Balascio FROM: Ryan Shea, PTP, Senior Transportation Planner DATE: April 10, 2023 PROJECT : Willow Glen IV SUBJECT: Traffic Scoping Analysis Introduction Yelm Property Development, LLC is proposing to construct a 75-lot single-family subdivision in Yelm, Washington. This Traffic Scoping Analysis estimates the trip generation, distribution, and assignment for the proposed development. Figure 1 illustrates the site vicinity and the transportation network serving the project Figure 1. Site Vicinity April 10, 2023 Page 2 of 3 Proposed Developm ent The proposed Willow Glen IV project will redevelop an existing 12.53-acre homesite as a new 75-lot single-family residential plat. The site is located at 9819 Grove Road SE within the City of Yelm urban growth boundary. Access to the project will be provided by two full access driveways, one on Grove Road and one on Greenleaf Loop. Project Traffic Characteristics The two project-related characteristics having the most effect on area traffic conditions are peak hour trip generation and the directional distribution of traffic volumes on the surrounding roadway network. Site-Generated Traffic Volumes Vehicle trip generation was calculated using the trip generation rates contained in the 11th edition of the Trip Generation Manual by the Institute of Transportation Engineers (ITE). Single-Family Detached Housing (land use code 210) has been used to calculate the trip generation. For this analysis, the “fitted- curve” equation was used to estimate trips in preference to using the average trip rate as this approach was recommended by ITE. The trip generation rates used for the proposed project are shown in Table 1. Table 1. ITE Trip Generation Rates Single-Family Detached Housing (LUC 210) Time Period Unit Trip Rate Enter % Exit % AM Peak Hour Dwelling Units 0.76 26% 74% PM Peak Hour Dwelling Units 1.01 63% 37% Daily Dwelling Units 10.33 50% 50% The total trip generation expected from this project is calculated by applying the unit measure for each land use category to the appropriate trip generation rate. The trip generation calculations are shown in Table 2. Table 2. Project Trip Generation Time Period Units Total Trips Enter Exit AM Peak Hour 75 57 14 42 PM Peak Hour 75 76 48 28 Daily 75 774 387 387 April 10, 2023 Page 3 of 3 Site Traffic Distribution and Assignment We have prepared a trip distribution and assignment for the proposed development. The directional distribution of traffic to and from the proposed project was estimated using the regional transportation model. The Thurston Regional Planning Council (TRPC) created the area-wide transportation model with cooperation from local jurisdictions within the county. The model, developed using the Emme/4 software package, has been calibrated to represent the existing vehicle travel patterns throughout the entire county. The Willow Glen IV project is located within TAZ 711 of the regional transportation model. A distribution analysis was performed for this project by conducting a “Select Zone Analysis” for this TAZ. This feature of the Emme/4 software package allows all of the traffic into and out of a particular zone to be isolated and shown separately from the rest of the traffic on the network. This graphically shows the percentage of vehicles currently using each of the available routes into and out of the area. From this information, regional distribution percentages were calculated for future traffic traveling to and from the Willow Glen IV project. The resultant traffic distribution percentages and traffic assignments are shown on Figure 2 for the PM peak hour. A copy of the Emme/4 select zone analysis model plot is attached. Summary Yelm Property Development, LLC proposes to construct a 75-lot single-family subdivision in Yelm, Washington. The proposed project is expected to generate 57 new AM peak hour trips and 76 new PM peak hour trips. We have presented this information for the City’s use in determining the if additional analysis is required and if so, to help develop the Scope of Work for a Traffic Impact Analysis. If you have any questions or comments about the enclosed information, please contact me at (360) 352- 1465, Ext. 140. Respectfully, SCJ Alliance Ryan Shea, PTP Senior Transportation Planner Attachments: Preliminary Site Plan Figure 2 TRPC Model Select Zone Analysis N:\Projects\5464 Yelm Property Development LLC\21-000363 Willow Glenn 4\Phase 02 - Preliminary Plat\Design\Traffic\Scoping Letter\2023-0410 Willow Glenn Traffic Scoping.docx 123OPEN SPACE/DRAINAGEOPENSPACE456789101112131415161718192021222324252627282930313233343536373839404142434445464748495063626160595857565554535251646566676869707172737475123OPEN SPACE/DRAINAGEOPENSPACE456789101112131415161718192021222324252627282930313233343536373839404142434445464748495063626160595857565554535251646566676869707172737475ROAD BROAD AGROVE ROAD SEFLUME ROAD (VACATED)GREENLEAF LOOP SEFLUME RD SECANAL ROAD SELEGENDJOB NO:DRAWING FILE NO:DATE:DESIGNER:BYDATEREVISIONSDRAWN BY:SHEET TITLE:OFDRAWING NO:SHEET NO:PROJECT NAME:SEAL:APPROVED BY:WILLOW GLEN IVYELM, WASHINGTONMARCH 202321-00036399819 GROVE ROAD SE8730 TALLON LANE NE, SUITE 200, LACEY, WA 98516P: 360.352.1465SCJALLIANCE.COM--/--/----SENNIOALFEP R ON D21019143IGERSERETSSTATEOFWASHIGINEERG T O N DANIEL PATRICK PHIL L I P S PRELIMINARYPRELIMINARY SITE PLAN21-000363_SP-01SP-01A. REED4D. PHILLIPSD. PHILLIPSSCALE IN FEET050100 Willow Glenn IVYelm, WashingtonTraffic Scoping AnalysisProjectSiteRailway Rd SEMiddle Rd SECascadianAveGree n l e afLoop100th Way SEGrove Rd SE OldYelm-McKennaRdSENW Rhoton Rd Stevens St NW1st St NEFigure 2Site-Generated Traffic VolumesPM Peak HourLegendXX%Primary Trip DistribuƟon PercentageXXPrimary Traffic VolumesProject TripsInboundOutboundTotal48 28 7621%122144%5817%18%596101) Stevens St NWat 1st St NE 2112 952) 1st St NE/NW Rhoton Rd at Railway Rd SE 17 303) Railway Rd SEat Middle Rd SE 30176) Old Yelm-McKenna Rd SEat Grove Rd SE 85 1064) Middle Rd SWat Cascadian Ave 1313) Site Drivewayat Greenleaf Loop 485) 100th Way SEat Grove Rd SE 2213 18118) Site Drivewayat Grove Rd SE 24 40 228 421354687N Made with Emme. Map tiles ©MapTiler ©OpenStreetMap contributors 711 TA Z 711 Trip Distribut ion Com mitted Project Ne twork 2023-04-05 Disclaimer: Thi s map is for general pl anning purposes only. Thurston Regional Planning Council makes no representation as to accuracy or fitness of the information for a particular purpose. Apr 05, 2023