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Home My WebLink AboutRS_Traffic_Impact_Study_190916_v1 2802 Wetmore Avenue  Suite 220  Everett, WA 98201 Tel: 425-339-8266  Fax: 425-258-2922  E-mail: info@gibsontraffic.com MEMORANDUM To: Josh Meharry, Rhodes Architecture From: Brad Lincoln, PE Subject: CITC Renton Date: June 15, 2018 Project #: 18-126 Gibson Traffic Consultants, Inc. has been retained to provide a traffic analysis for the Construction Industry Training Council (CITC) Renton development. The development is located in the northeast corner of Bronson Way N at Garden Avenue N. A site vicinity map is included in Figure 1. The site is currently occupied by a 32,951 SF automobile parts and service center, which will be removed with the development. The CITC Renton development will include space for 120 students. Figure 1: Site Vicinity SITE N 2nd St Garden Ave N CITC Renton Traffic Analysis Gibson Traffic Consultants, Inc. June 2018 info@gibsontraffic.com 2 GTC #18-126 1. TRIP GENERATION CALCULATIONS The trip generation calculations for the CITC Renton development are based on data collected at a similar site in the City of Marysville and data contained in the Institute of Transportation Engineers’ (ITE) Trip Generation Manual, 10th Edition (2017). 1.1. CITC Marysville Site PM peak-hour data was collected by the independent count firm Traffic Data Gathering (TDG) in May 2018 at the CITC Marysville site located at 3506 124th Street NE. The CITC Marysville site has an enrollment of 97 students. The trip generation observed during the weekday PM peak-hour between 4:00 PM and 6:00 PM and the resulting trip generation rate is summarized in Table 1. Table 1: CITC Marysville Trip Generation Data PM Peak-Hour Trips Inbound Trips % Outbound Trips % Students PM Trips per Student 4:30 PM to 5:30 PM 17 14 81% 3 19% 97 0.18 The CITC Marysville site has a weekday PM peak-hour trip generation of 17 trips, which equates to a trip generation rate of 0.18 trips per student. The data from the CITC Marysville site is included in the attachments. 1.2. Comparison to ITE Data The data from the CITC Marysville site was compared to data published by ITE in Trip Generation Manual, 10th Edition (2017). The most applicable ITE Land Use Code is 540, Junior/Community College. The PM peak-hour trip generation rate collected at the CITC Marysville site was compared to the PM peak-hour trip generation rate for ITE Land Use Code 540. The ratio between the two PM peak-hour rates was then used to calculate the proportional daily and AM peak-hour trip generation for the CITC Renton site. The same PM peak-hour trip generation rate, 0.18 trips per student, was applied for the PM peak-hour trip generation. It should be noted ITE specifically mentions access to transit as a factor that could reduce the trip generation for LUC 540. The Marysville site is served by one bus route while the Renton location is served by four. The actual trip generation rate at the Renton facility could therefore be much lower than the observed rate at the Marysville location. The trip generation of the CITC Renton site is summarized in Table 2. Table 2: CITC Renton Trip Generation Summary CITC Renton 120 Students Average Daily Trips AM Peak-Hour Trips PM Peak-Hour Trips Inbound Outbound Total Inbound Outbound Total Inbound Outbound Total Generation Rate 1.88 trips per Student 0.218 trips per Student 0.18 trips per Student Splits 50% 50% 100% 77% 23% 100% 81% 19% 100% Trips 113 113 226 18 4 22 18 4 22 CITC Renton Traffic Analysis Gibson Traffic Consultants, Inc. June 2018 info@gibsontraffic.com 3 GTC #18-126 The trip generation calculations for the CITC Renton site are included in the attachments. 1.3. Existing Use The CITC Renton will replace the 32,951 SF automobile parts and service center that is currently on the site. The trip generation of the existing use, which is creditable to the CITC Renton development, has been calculated using average trip generation rates for ITE Land Use Code 943, Automobile Parts and Service Center. This is the most applicable ITE Land Use Code for what is currently on the site. The trip generation of the existing use is summarized in Table 3. Table 3: Existing Use Trip Generation Summary 32,951 SF Automobile Parts and Service Average Daily Trips AM Peak-Hour Trips PM Peak-Hour Trips Inbound Outbound Total Inbound Outbound Total Inbound Outbound Total Generation Rate 16.28 trips per 1,000 SF 1.96 trips per 1,000 SF 2.26 trips per 1,000 SF Splits 50% 50% 100% 73% 27% 100% 40% 60% 100% Trips 268 268 536 47 18 65 30 44 74 The trip generation calculations of the existing use that is being removed are included in the attachments. 1.4. Change in Trip Generation The change in trip generation with the CITC Renton development, including credit for the previous use on the site, is summarized in Table 4. Table 4: Change in Trip Generation Use Average Daily Trips AM Peak-Hour Trips PM Peak-Hour Trips Inbound Outbound Total Inbound Outbound Total Inbound Outbound Total CITC Renton (New) 113 113 226 18 4 22 18 4 22 Auto Parts & Service (Removed) -268 -268 -536 -47 -18 -65 -30 -44 -74 NEW TRIPS -155 -155 -310 -29 -14 -43 -12 -40 -52 The trip generation shows that the CITC Renton development is anticipated to generate fewer daily, AM peak-hour and PM peak-hour trips than the existing automobile parts and service use. The total trip generation calculations are included in the attachments. CITC Renton Traffic Analysis Gibson Traffic Consultants, Inc. June 2018 info@gibsontraffic.com 4 GTC #18-126 2. PARKING The CITC Renton site is proposed to have 64 parking spaces for the 120 student facility. Parking demand was collected at the CITC Marysville site at the same time as the PM peak-hour trip generation data. The parking data shows a maximum parking demand of 19 spaces between 4:00 PM and 6:00 PM. This equates to a peak parking demand of 0.20 spaces per student. This data is similar to parking demand data published in the ITE Parking Generation, 4th Edition (2010). The parking demand of 0.20 spaces per student would result in a peak demand of 24 spaces for the CITC Renton site. The proposed 64 space parking supply should therefore satisfy the parking demand of the CITC Renton site. 3. TRAFFIC IMPACT FEE CALCULATIONS The CITC Renton site is not anticipated to generate any new daily, AM peak-hour or PM peak-hour trips. The CITC Renton site should therefore not be conditions to pay traffic impact fees. A Counts and ITE Trip Generation Data CITC RentonGTC #18-126Trip Generation for: Weekday(a.k.a.): Average Weekday Daily Trips (AWDT)NET EXTERNAL TRIPS BY TYPEIN BOTH DIRECTIONSDIRECTIONAL ASSIGNMENTSGross TripsInternalCrossoverTOTAL PASS-BYDIVERTED LINKNEW PASS-BYDIVERTED LINKNEWLAND USESVARIABLEITE LU codeTripRate%IN%OUTIn+Out(Total)% ofGrossTripsTripsIn+Out(Total)In+Out(Total)% ofExt.TripsIn+Out(Total)% ofExt.TripsIn+Out(Total)In+Out(Total)In Out In Out In OutCITC Renton (Trade School)120 Students Stdy 1.88 50%50% 2260%0 2260%00%0 226 0 0 0 0 113 113Automobile Parts & Service-32.951 KSF 943 16.28 50%50% -5360%0 -5360%00%0 -536 0 0 0 0 -268 -268Totals-3100 -31000 -310 0 0 0 0 -155 -155Daily Rate Calculation per StudentLand UseADTPMCITC Marysville - Study1.880.18ITE 540 - Junior/Comm. College1.150.11A - 1 CITC RentonGTC #18-126Trip Generation for: Weekday, Peak Hour of Adjacent Street Traffic, One Hour between 7 and 9 AM(a.k.a.): Weekday AM Peak HourNET EXTERNAL TRIPS BY TYPEIN BOTH DIRECTIONSDIRECTIONAL ASSIGNMENTSGross TripsInternalCrossoverTOTAL PASS-BYDIVERTED LINKNEW PASS-BYDIVERTED LINKNEWLAND USESVARIABLEITE LU codeTripRate%IN%OUTIn+Out(Total)% ofGrossTripsTripsIn+Out(Total)In+Out(Total)% ofExt.TripsIn+Out(Total)% ofExt.TripsIn+Out(Total)In+Out(Total)In Out In Out In OutCITC Renton (Trade School)120 Students Stdy0.18 81%19% 22 0% 0 22 0% 0 0% 0 22 0 0 0 0 18 4Automobile Parts & Service-32.951 KSF 9431.96 73%27% -65 0% 0 -65 0% 0 0% 0 -65 0 0 0 0 -47 -18Totals-430 -4300 -43 0 0 0 0 -29 -14AM Rate Calculation per StudentLand UseAMPMCITC Marysville - Study0.180.18ITE 540 - Junior/Comm. College0.110.11A - 2 CITC RentonGTC #18-126Trip Generation for: Weekday, Peak Hour of Adjacent Street Traffic, One Hour between 4 and 6 PM(a.k.a.): Weekday PM Peak HourNET EXTERNAL TRIPS BY TYPEIN BOTH DIRECTIONSDIRECTIONAL ASSIGNMENTSGross TripsInternalCrossoverTOTAL PASS-BYDIVERTED LINKNEW PASS-BYDIVERTED LINKNEWLAND USESVARIABLEITE LU codeTripRate%IN%OUTIn+Out(Total)% ofGrossTripsTripsIn+Out(Total)In+Out(Total)% ofExt.TripsIn+Out(Total)% ofExt.TripsIn+Out(Total)In+Out(Total)In Out In Out In OutCITC Renton (Trade School)120 Students Stdy0.18 81%19% 22 0% 0 22 0% 0 0% 0 22 0 0 0 0 18 4Automobile Parts & Service-32.951 KSF 9432.26 40%60% -74 0% 0 -74 0% 0 0% 0 -74 0 0 0 0 -30 -44Totals-520 -5200 -52 0 0 0 0 -12 -40 A - 3 A - 4 A - 5 A - 6 A - 7 A - 8 A - 9 LOCATION:CITC on 124th Street NE Marysville, WA TIME OF COUNT:4:19 - 6:19 PM COUNTED BY:CN IN # of Occupants OUT # of Occupants 04:34 PM 1 1 04:35 PM 1 1 1 1 04:38 PM 1 1 04:39 PM 1 1 04:41 PM 1 1 04:46 PM 1,1 1,1 04:47 PM 1 1 04:48 PM 1 1 04:49 PM 1 1 04:52 PM 1,1 1,1 05:04 PM 1 1 05:16 PM 1 1 05:20 PM 1 1 05:24 PM 1 1 06:04 PM 1,1,1 1,1,1 06:05 PM 1 1 06:06 PM 1 1 06:08 PM 1 1 06:11 PM 1 1 06:14 PM 1,1 1,1 Notes:At 4:19 PM there were 6 vehicles parked At 6:00 PM there were 17 vehicles parked At 6:19 PM there were 8 vehicles parked TIME REDUCTION SHEET Thu. 5/24/2018 A - 10