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HomeMy WebLinkAboutRS_Traffic_Memo_Analysis_211130_V2.pdf 2813 Rockefeller Avenue  Suite B  Everett, WA 98201 Tel: 425-339-8266  Fax: 425-258-2922  E-mail: info@gibsontraffic.com MEMORANDUM To: Jonathan Chavez, PE, City of Renton From: Brad Lincoln, PE Project: 600 SW 10th Avenue Parking Expansion LUA21-000273 Subject: Traffic Analysis Date: November 19, 2021 GTC #: 21-375 This memorandum summarizes the traffic analysis for the parking lot expansion for the building located at 600 SW 10th Street in the City of Renton. A site vicinity map in included in Figure 1. Figure 1: Site Vicinity Lind Ave SW SW 7th St Thomas Ave SW SITE Rainier Ave S 600 SW 10th Street Parking Expansion Traffic Analysis Gibson Traffic Consultants, Inc. November 2011 info@gibsontraffic.com 2 GTC #21-375 The SW 10th Street Parking Expansion is proposing to pave the existing gravel areas to facilitate better storage of materials and parking of vehicles. The parking expansion is not proposed to change the use of the building, the number of accesses, or the location of the accesses. The trip generation of the building located at SW 10th Street has been calculated based on data contained in the Institute of Transportation Engineers’ (ITE) Trip Generation Manual, 10th Edition (2017) and information on the actual use of the site. The average trip generation rates for ITE Land Use Code 140, Manufacturing, has been used for the trip generation calculations since the existing use is primarily manufacturing, meaning raw materials and components are turned into some type of product. The trip generation of the existing 114,531 SF building using ITE average trip generation rates is summarized in Table 1. Table 1: Trip Generation Summary – ITE Data 114,531 SF Manufacturing Average Daily Trips AM Peak-Hour Trips PM Peak-Hour Trips Inbound Outbound Total Inbound Outbound Total Inbound Outbound Total Generation Rate 3.93 trips per 1,000 SF 0.62 trips per 1,000 SF 0.67 trips per 1,000 SF Splits 50% 50% 100% 77% 23% 100% 31% 69% 100% Trips 225 225 450 55 16 71 24 53 77 The trip generation calculations have also been performed base on the existing use of the site, including the number of employees, shift schedule, and schedules for deliveries to the site and from the site. The existing use includes the following:  40 employees  2.5 shifts per day  25 deliveries per day (total of deliveries to the site and from the site)  5 rail deliveries per week, equal to 20 truck deliveries per week These uses are approximate since some days there may be 20 total deliveries and other days may have 30 total deliveries. These numbers are meant to represent the average day. The trip generation of the current use of the existing building is summarized in Table 2. Table 2: Trip Generation Summary – Current Use Generator Quantity Trips Assumptions Daily Peak-Hour Employees (40 employees with 2.5 shifts) 100 300 80  3 daily trips per employee  shift change during peak-hour Deliveries (to the site and from the site) 25 50 5  2 daily trips per employee  10% during peak-hour Deliveries (rail equivalent) 5 10 0  Rail deliveries become truck deliveries TOTAL --- 360 85 600 SW 10th Street Parking Expansion Traffic Analysis Gibson Traffic Consultants, Inc. November 2011 info@gibsontraffic.com 3 GTC #21-375 The trip generation based on the ITE data and the current use are very similar. It is important to note that the peak-hour trip generation of the current use assumed there is a shift change during the peak- hour. A shift change occurs outside the peak-hour would significantly reduce the peak-hour trip generation of the current use. The current use is not anticipated to change with the proposed parking lot expansion. The only change would be that materials and trucks would be stored on a paved surface, as opposed to a gravel surface. The traffic impacts of the building at 600 SW 10th Street are therefore not proposed to change with the proposed paving. It is possible that a future use could utilize the site and change the trip generation. However, the traffic impacts of any future potential use should be evaluated when an application, such as a tenant improvement, is applied for. The proposed parking expansion should be approved with regards to traffic impacts without further analysis and without the need for traffic mitigation fees.