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Home My WebLink AboutRS_GMC Addition-Trip Gen Assessment_220127_v1.pdf215 SW 12TH STREET TRIP GENERATION ASSESSMENT Renton, WA Prepared for: Mr. Brad Brotherton Brotherton Cadillac/GMC/Buick 215 SW 12th Street Renton, WA 98055 January, 2022 HEATH & ASSOCIATES, INC Transportation and Civil Engineering PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 01/27/2022 January 27, 2022 Mr. Brad Brotherton Brotherton Cadillac/GMC/Buick 215 SW 12th Street Renton, WA 98055 The intent of this assessment is to provide the city of Renton with a trip generation summary and site characteristics for the proposed project herein referred to as 215 SW 12th Street. A project description is provided below. PROJECT DESCRIPTION 215 SW 12th Street proposes for a 4,460 square foot addition to an existing auto dealership located in the city of Renton. The dealership is located at 215 SW 12th Street, with the addition occurring to the southwesterly portion of the building. The development proposal entails and expansion of the current service department on-site. The existing dealership is located on a cumulative 1.63-acres within tax parcel #’s: 334040-2820; 2850; -2860; -2870; & -2885. Access is to existing dealership is to remain via SW 12th Street and SW 13th Street. A vicinity map of the surrounding roadway network is provided below with the subject parcel highlighted in blue. A conceptual site plan is presented in Figure 2 on the following page. Figure 1: Aerial Vicinity HEATH & ASSOCIATES, INC Transportation and Civil Engineering PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 2 Figure 2: Site Plan PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 3 TRIP GENERATION Trip generation is defined by the number of vehicular movements that enter or exit a site during a particular timeframe. For the proposed uses, estimated trip rates were derived from the Institute of Transportation Engineer’s publication Trip Generation, 11th Edition. Land Use Code (LUC) 840 – Automobile Sales (New) was determined to be most representative for the proposed addition. Square footage was used as the independent variable and average rates were applied to determine trip ends. Volumes for the average weekday daily trips (AWDT), AM peak hour and PM peak hour trips are summarized in Table 1 below. Table 1: Project Trip Generation Land Use Size AWDT AM Peak-Hour Trips PM Peak-Hour Trips In Out Total In Out Total Auto Sales (New) – LUC 840 4,460 sq. ft. 124 6 2 8 4 7 11 Based on ITE data, the project is anticipated to be a moderate generator of new traffic with 124 average weekday daily trips, 8 AM peak hour trips (6 inbound/2 outbound) and 11 PM peak hour trips (4 inbound/7 outbound). The City of Renton thresholds for requiring a Traffic Impact Analysis (TIA) are: 20 new peak hour trips or 200 new average daily trips. Upon review of the development proposal and ITE data, the TIA threshold criteria are not met. TRIP ASSIGNMENT AND DISTRIBUTION Trip distribution describes the process by which project generated trips are dispersed on the street network surrounding the site. Trips generated by the project are expected to follow the general trip pattern as shown in Figure 3 for the PM peak travel hour. Percentages are primarily based on existing traffic volumes and proximity to nearby arterials/amenities. All project-generated traffic was assigned to the primary access intersection of SW 12th Street & Maple Avenue SW. PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 4 PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 5 SUMMARY 215 SW 12th Street Brotherton Cadillac project proposes for the construction of a 4,460 square foot addition to their service department located in the city of Renton. The 1.63-acre property is bordered to the north by SW 12th Street and to the west by Maple Avenue SW. The existing dealership on-site is to remain and access is to continue as currently configured. Based on ITE data, 8 new AM peak hour trips, 11 new PM peak hour trips and 124 new average weekday daily trips can be expected coming to and from the site. The project as proposed does not meet the City’s minimum threshold for requiring a full Traffic Impact Analysis. Please feel free to contact me should you require further information. Aaron Van Aken, P.E. PTOE PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 6 1/27/22, 12:48 PM https://itetripgen.org/PrintGraph.htm?code=840&ivlabel=QFQAF&timeperiod=AWDVTE&x=&edition=639&locationCode=General… https://itetripgen.org/PrintGraph.htm?code=840&ivlabel=QFQAF&timeperiod=AWDVTE&x=&edition=639&locationCode=General Urban/Suburban&co…1/1 Automobile Sales (New) (840) Vehicle Trip Ends vs:1000 Sq. Ft. GFA On a:Weekday Setting/Location:General Urban/Suburban Number of Studies:18 Avg. 1000 Sq. Ft. GFA:36 Directional Distribution:50% entering, 50% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 27.84 14.98 - 41.78 7.01 Data Plot and Equation T = Trip EndsX = 1000 Sq. Ft. GFA Study Site Average RateFitted Curve Fitted Curve Equation: T = 28.65(X) - 29.45 R²= 0.80 Trip Gen Manual,11th Edition Institute of Transportation Engineers 0 20 40 60 800 500 1,000 1,500 2,000 2,500 PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 7 1/27/22, 12:48 PM https://itetripgen.org/PrintGraph.htm?code=840&ivlabel=QFQAF&timeperiod=TASIDE&x=&edition=639&locationCode=General … https://itetripgen.org/PrintGraph.htm?code=840&ivlabel=QFQAF&timeperiod=TASIDE&x=&edition=639&locationCode=General Urban/Suburban&cou…1/1 Automobile Sales (New) (840) Vehicle Trip Ends vs:1000 Sq. Ft. GFA On a:Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 7 and 9 a.m. Setting/Location:General Urban/Suburban Number of Studies:35 Avg. 1000 Sq. Ft. GFA:30 Directional Distribution:73% entering, 27% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 1.86 0.59 - 6.17 0.94 Data Plot and Equation T = Trip EndsX = 1000 Sq. Ft. GFA Study Site Average Rate Fitted Curve Equation: Not Given R²= **** Trip Gen Manual,11th Edition Institute of Transportation Engineers 0 20 40 60 800 50 100 150 200 PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 8 1/27/22, 12:48 PM https://itetripgen.org/PrintGraph.htm?code=840&ivlabel=QFQAF&timeperiod=TPSIDE&x=&edition=639&locationCode=General … https://itetripgen.org/PrintGraph.htm?code=840&ivlabel=QFQAF&timeperiod=TPSIDE&x=&edition=639&locationCode=General Urban/Suburban&cou…1/1 Automobile Sales (New) (840) Vehicle Trip Ends vs:1000 Sq. Ft. GFA On a:Weekday, Peak Hour of Adjacent Street Traffic, One Hour Between 4 and 6 p.m. Setting/Location:General Urban/Suburban Number of Studies:50 Avg. 1000 Sq. Ft. GFA:34 Directional Distribution:40% entering, 60% exiting Vehicle Trip Generation per 1000 Sq. Ft. GFA Average Rate Range of Rates Standard Deviation 2.42 0.94 - 5.81 0.98 Data Plot and Equation T = Trip EndsX = 1000 Sq. Ft. GFA Study Site Average RateFitted Curve Fitted Curve Equation: T = 1.81(X) + 20.91 R²= 0.57 Trip Gen Manual,11th Edition Institute of Transportation Engineers 0 20 40 60 800 100 200 300 PO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 9 CONCEPTSITE PLAN217 SW 12th Street Renton, WashingtonCOPYRIGHT 2021STATE OF WASHINGTONJAMES H. CASTINOSTATE OF WASHINGTONREGISTEREDARCHITECTREGISTEREDARCHITECT5438PrincipalJames CastinoBrotherton Buick-GMC SERVICE DEPARTMENT ADDITION8911 71st Ave. NWGig Harbor, WA 98332PHONE: (253) 973-6680EMAIL: jimpilot22@gmail.comPO Box 397 Puyallup, WA 98371 (253) 770 1401 heathtraffic.com 10