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HomeMy WebLinkAboutRS_Traffic_Study_230426_V1GRANT PLACE TOWNHOMES Renton, WA TRIP GENERATION ASSESSMENT April 26, 2023 HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 2 GRANT PLACE TOWNHOMES TRIP GENERATION ASSESSMENT Prepared for: Satwant Singh Siki Chang Prepared by: Heath & Associates PO Box 397 Puyallup, WA 98371 (253) 770 1401 Heathtraffic.com License: HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 3 GRANT PLACE TOWNHOMES TRIP GENERATION ASSESSMENT CONTENTS 1. Introduction ............................................................................................................. 4 2. Project Description ................................................................................................. 4 3. Existing Conditions ................................................................................................ 6 4. Forecast Traffic Demand and Analysis ................................................................ 9 5. Conclusions & Mitigation .................................................................................... 11 TABLES 1. Collision History ...................................................................................................... 8 2. Project Trip Generation ......................................................................................... 9 FIGURES 1. Vicinity Map & Roadway System ........................................................................... 4 2. Site Plan ................................................................................................................... 5 3. Roadway Improvements ........................................................................................ 6 4. Public Transit ........................................................................................................... 7 5. PM Peak Hour Trip Distribution & Assignment ................................................ 10 HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 4 GRANT PLACE TOWNHOMES TRIP GENERATION ASSESSMENT 1. INTRODUCTION Heath & Associates has been retained to provide an update to the January 21, 2014 Grant Place Townhomes Site Access/Traffic Impact Fee Traffic Letter prepared by Jake Traffic Engineering, Inc. This report will follow similar methodologies and scope but update to reflect current standards. 2. PROJECT DESCRIPTION Grant Place Townhomes, presently under construction, consists of 36 townhouse dwelling units located within the city of Renton. The subject property has a site address of 1600 Grant Avenue South and is contained in a single 2.14-acre parcel: 202305-9052. Per the original traffic report, and based on the provided site plan, the site is accessed via two driveways extending east from Grant Avenue S. The northern driveway would serve as ingress only and the southern driveway as egress only. A total of 79 parking stalls, including attached garages, are available. A general vicinity map illustrating the subject parcel is shown below. Figure 2 displays the site plan and accesses to Grant Avenue S. N Subject Site Figure 1: Vicinity Map FIGURE 2SITE PLANGRANT PLACE TOWNHOMESN 5 HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 6 3. EXISTING CONDITIONS 3.1 Existing Street System The subject site is bordered to the west via Grant Avenue S, a two-lane north-south roadway. The roadway is gated approximately 1,400-feet north of the subject property and does not allow through movements. Sidewalk is generally available on at least one-side of the roadway and street-parking is offered in some areas. The posted speed limit is 25-mph, and the roadway generally increases in elevation as you travel north. 3.2 Roadway Improvements City of Renton’s 2023-2028 Six-Year Transportation Improvement Program (TIP) was reviewed to determine whether any planned projects are within the site vicinity. The nearest projects are planned along SW Grady Way, north of I-405 and a Safe Route to Transit project at Beacon Way S and Puget Drive SE (see image to right from City’s TIP) Figure 3: Roadway Improvements City of Renton 2023-2028 Six-Year TIP HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 7 3.3 Transit Service The nearest public transit is offered along S Puget Drive, approximately 1,450-feet walking distance south of the subject site at the intersection of S Puget Drive & Grant Avenue S. Metro Transit Routes 102 (routes to Downtown Seattle) and 148 (to Renton Transit Center) are available. Refer to Metro Transit for detailed Route information. Figure 4: Public Transit Routes 102/148 Grant Place T.H. 1450-feet HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 8 3.4 Collision History A list of the recorded collision history from the last 3-years at the access intersection/corridor was requested from WSDOT (consistent with original traffic study). A summary of the collisions per year is listed below in Table 1. Table 1: Collision History Intersection/Corridor 2020 2021 2022 Avg/Yr S Puget Dr & Grant Ave S 1 0 0 0.3 Grant Ave S between S Puget Dr & road terminus 1 0 1 0.67 Out of the 3 reported collisions along the Grant Avenue S corridor, the collision types were listed as “Entering at Angle” (1) followed by “Vehicle Turning Right Hits Pedestrian” (1), and “From Opposite Direction – All Others” (1). Driver circumstances were listed as “Did Not Grant Right-Of-Way to Vehicle” (1), “Did Not Grant Right-Of-Way to Non-Motorist” (1), and “Eating or Drinking” (1), respectively. The vehicle-pedestrian incident occurred at the intersection of S Puget Drive and Grant Avenue by a southbound right-turning motorist resulting in a possible injury. HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 9 4. FORECAST TRAFFIC DEMAND & ANALYSIS 4.1 Project Trip Generation Trip generation is defined as the number of vehicle movements that enter or exit the respective project site during a designated time period, such as a specific peak hour (AM or PM) or an entire day. The magnitude of the anticipated vehicle trip generation for the proposed project was derived from the Institute of Transportation Engineers (ITE) publication, Trip Generation, 11th Edition. Based on the proposed development, the designated land use is defined as LUC – 215 Single-Family Attached Housing (i.e., townhomes). Dwelling units were used as the input variable and ITE’s equations were used to determine trip ends. ITE trip generation sheets have been attached in the appendix for reference. Table 2: Project Trip Generation Land Use Dwelling Units AWDT AM Peak-Hour Trips PM Peak-Hour Trips In Out Total In Out Total Single-Family Attached – LUC 215 36 224 3 10 13 10 8 18 For single-family attached units, ITE data estimates the 36 dwelling units can generate 224 average weekday daily trips with 13 trips occurring the AM peak hour and 18 trips in the PM peak hour. The original analysis indicated that site development removed one-single family homes. Therefore, net new trips would be 12 and 17 trips in the AM and PM peak hours, respectively. 4.2 Distribution & Assignment As mentioned previously, Grant Avenue S does not permit through connectivity to the north of the subject property. Therefore, all site-generated traffic would come to and from the south whereupon splits east and west along S Puget Drive could be made. The majority of trips would be expected to head to/from the west to major routes such as I-405, I-5, SR 167 and SR 515. Two driveways serve the property with the northern driveway as an inbound only and the southern driveway as an exit only. See Figure 5 for PM peak hour trip distribution and assignment. FIGURE 5 PM PEAK HOUR TRIP DISTRIBUTION & ASSIGNMENT GRANT PLACE TOWNHOMES N SITE100 00 10 0 0 STOP8 PM PEAK HOUR TRIPS INBOUND: 10 VPH OUTBOUND: 8 VPH 75% 25%GRANT AVE SS PUGET DR S 18TH ST 00 6 8 2 2STOP 10 HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 11 4.3 Access & Sight Distance At the time of this report, the subject property is under construction. Two driveways serve the property (refer to Figure 2: Site Plan). Sight distance examinations were made as part of the original 2014 Traffic Study which indicated that sight distance met AASHTO standards. The original traffic study has been attached for reference which includes field measurements, photos, and summaries. 5. CONCLUSIONS Grant Place Townhomes consists of 36 townhome units presently under construction and occupying tax parcel 202305-9052. The subject site is located on the east side of Grant Avenue S (1600 Grant Avenue S) within the city of Renton. Two driveways— northern driveway as an inbound only and southern driveway as an outbound only— serve the property. This report was intended to provide an update to the original 2014 Grant Place Townhomes Site Access/Traffic Impact Fee Traffic Letter prepared by Jake Traffic Engineering, Inc. Per ITE data, the 36-townhome units are estimated to generate 224 weekday daily trips and 18 trips in the PM peak hour. The PM peak hour trips are consistent with the 2014 Traffic Study findings. No further evaluation or mitigation outside the original findings is identified at this time. Please feel free to contact me should you have any questions. Aaron Van Aken, P.E., PTOE HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 12 GRANT PLACE TOWNHOMES TRIP GENERATION ASSESSMENT APPENDIX ITE SHEETS 10/27/21, 10:11 AM https://itetripgen.org/PrintGraph.htm?code=215&ivlabel=UNITS215&timeperiod=AWDVTE&x=&edition=639&locationCode=Gen… https://itetripgen.org/PrintGraph.htm?code=215&ivlabel=UNITS215&timeperiod=AWDVTE&x=&edition=639&locationCode=General Urban/Suburban&…1/1 Single-Family Attached Housing (215) Vehicle Trip Ends vs: Dwelling Units On a: Weekday Setting/Location: General Urban/Suburban Number of Studies: 22 Avg. Num. of Dwelling Units: 120 Directional Distribution: 50% entering, 50% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 7.20 4.70 - 10.97 1.61 Data Plot and Equation T = Trip EndsX = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 7.62(X) - 50.48 R²= 0.94 Trip Gen Manual,11th Edition Institute of Transportation Engineers 0 100 200 300 400 500 6000 1,000 2,000 3,000 4,000 5,000 Grant Place Townhomes Trip Generation Assessment 13 10/27/21, 10:11 AM https://itetripgen.org/PrintGraph.htm?code=215&ivlabel=UNITS215&timeperiod=TASIDE&x=&edition=639&locationCode=Gene… https://itetripgen.org/PrintGraph.htm?code=215&ivlabel=UNITS215&timeperiod=TASIDE&x=&edition=639&locationCode=General Urban/Suburban&c…1/1 Single-Family Attached Housing (215) Vehicle Trip Ends vs:Dwelling Units 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:46 Avg. Num. of Dwelling Units:135 Directional Distribution:31% entering, 69% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 0.48 0.12 - 0.74 0.14 Data Plot and Equation T = Trip EndsX = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 0.52(X) - 5.70 R²= 0.92 Trip Gen Manual,11th Edition Institute of Transportation Engineers 0 200 400 6000 100 200 300 400 500 Grant Place Townhomes Trip Generation Assessment 14 10/27/21, 10:11 AM https://itetripgen.org/PrintGraph.htm?code=215&ivlabel=UNITS215&timeperiod=TPSIDE&x=&edition=639&locationCode=Gene… https://itetripgen.org/PrintGraph.htm?code=215&ivlabel=UNITS215&timeperiod=TPSIDE&x=&edition=639&locationCode=General Urban/Suburban&c…1/1 Single-Family Attached Housing (215) Vehicle Trip Ends vs:Dwelling Units 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:51 Avg. Num. of Dwelling Units:136 Directional Distribution:57% entering, 43% exiting Vehicle Trip Generation per Dwelling Unit Average Rate Range of Rates Standard Deviation 0.57 0.17 - 1.25 0.18 Data Plot and Equation T = Trip EndsX = Number of Dwelling Units Study Site Average RateFitted Curve Fitted Curve Equation: T = 0.60(X) - 3.93 R²= 0.91 Trip Gen Manual,11th Edition Institute of Transportation Engineers 0 200 400 6000 100 200 300 400 500 Grant Place Townhomes Trip Generation Assessment 15 HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 16 GRANT PLACE TOWNHOMES TRIP GENERATION ASSESSMENT APPENDIX ORIGINAL 2014 TRAFFIC ASSESSMENT Grant Place Townhomes Trip Generation Report 17 Grant Place Townhomes Trip Generation Report 18 Grant Place Townhomes Trip Generation Report 19 Grant Place Townhomes Trip Generation Report 20 Grant Place Townhomes Trip Generation Report 21 Grant Place Townhomes Trip Generation Report 22 Grant Place Townhomes Trip Generation Report 23 Grant Place Townhomes Trip Generation Report 24 Grant Place Townhomes Trip Generation Report 25 Grant Place Townhomes Trip Generation Report 26 Grant Place Townhomes Trip Generation Report 27 Grant Place Townhomes Trip Generation Report 28 Grant Place Townhomes Trip Generation Report 29 Grant Place Townhomes Trip Generation Report 30 Grant Place Townhomes Trip Generation Report 31 Grant Place Townhomes Trip Generation Report 32 Grant Place Townhomes Trip Generation Report 33 Grant Place Townhomes Trip Generation Report 34 Grant Place Townhomes Trip Generation Report 35 Grant Place Townhomes Trip Generation Report 36 Grant Place Townhomes Trip Generation Report 37 HeathTraffic.com Grant Place Townhomes Trip Generation Assessment 38 GRANT PLACE TOWNHOMES TRIP GENERATION ASSESSMENT APPENDIX SITE PLAN SITE PLAN1" = 20'-0"Net Site Area = 93,100 S.F. (2.14 acre)Site Impervious Surface = 63,434 S.F. (68%)Site Pervious Area = 29,666 S.F.Lot CoverageTotal building footprints24,620 S.F.Lot Coverage 26.4%Landscaping AreaArea available for landscaping 29,666 S.F.DensityNet Density allowed = 10 min, 20 max per acreDensity provided = 17 units per acreUnit CountUnit F-2116Unit E-1612Unit E-20 8Total Number of Units 36Building Square Footage (per use)Lower Levels =22,404 S.F.Main Levels = 23,528 S.F.Upper Levels = 22,424 S.F.Total =68,356 S.F.Max Wall Plate Height allowed =32'-0"Max Building Height (≥4:12)=38'-0"(6' above max plate height)Wall Plate Height provided =+/-26'-0"Building Height provided = +/-35'-0"(including 6' roof slope bonus)Minimum Front Yard Setback=10'Side Yard Setback (unattached) = 5'Rear Yard Setback =10'Front yard setback provided = 10' +Side Yard Setback (unattached) Provided = 12' +Rear Yard Setback Provided (travel lane) = 7' +F21F21E16E20E16BUILDING 13181 SFBUILDING 83181 SFBUILDING 53181 SFBUILDING 22630 SFBUILDING 32630 SFBUILDING 62630 SFBUILDING 72630 SFGRANT AVE. S.BUILDING 43181 SF95'25.5'78.5'24.6'78.5'72.44'95'18.29'56.73'33.5'32.84'33.5'27.34'30.66'25.45'4' 10' 4' 4'PLAZA WALKWAYPARK SPACE,7,748 SFCOMMONOPEN SPACE33.5'26.67'33.5'22.35' 41.82'23'23'9'56'-0"OVERHEAD POWERLINE EASEMENT95'72.44'78.5'25.1'78.5'25'95'140.41'+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"+18"ARBOR/SEATING AREASEATINGAREASEATINGAREASEATINGAREAENTRYSIGNAGE20' FIRE LANE 4' PED PATH 26.67' 27.35'72.44'72.44'6.09'13.5'6.09'6.09'41.32'86.6'6.09'109.55'6.09'25'6.09'12.84'6.09'24.6'6.09'12.44'6.09'Key Legend Cont.Entry DoorTree to be savedParking StallProvided private usableopenspace with min.8' dimension.Designated Waste & recycling padsBollard = P5245-31Wall Sconce = P5642-31Fire HydrantSite SignFire Lane22.92'20.19'PRIVATE DRIVE22.32' 4.35'PROPOSED ROCKERYEXISTING FENCEPROPOSEDROCKERYPROPOSED ROCKERYGREENSPACE2,474 SFTREE PRESERVATION2,459 SF4'TW=361BW=359TW=360BW=358TW=359BW=354TW=362BW=356TW=363BW=35820' FIRE LANE20'4' 13.09' 12.42'20'12.42'16.5'21'16.5'21'12.42' 12.42' 13.5' 13.09' 13.09' 12.69' 12.42' 13.09'12.42'13.09'12.42'13.09' 12.42' 12.4' 12.42' 12.42' 13.09' 12.42' 12.42' 12.42' 12.42'12.42' 12.42' 12.42' 13.5' 14.17' 14.17' 13.5' 13.5' 14.17' 14.17' 13.5'21'16.5'20'16.5'21'21'16.5'20'16.5'21'21'20'16.5'21'21'20'16.5'21'21'16.5'20'16.5'21'21'16.5'20'21'21'16.5'20'21'308.8 SF307.9 SF307.6 SF307.6 SF307.9 SF307.8 SF307.4 SF307.6 SF307.6 SF232.7 SF249.8 SF223.5 SF223.5 SF222.3 SF223.5 SF223.5 SF223.5 SF223.5 SF223.5 SF265.4 SF265.4 SF265.3 SF265.6 SF265.6 SF265.6 SF308.8 SF341.3 SF241.3 SF241.3 SF346.5 SF287.4 SF346.5 SF336.2 SF241.3 SF241.3 SF287.4 SF12'6'12'6'12'6' 6'12'14.42'14.42'F21F21E16E20E16F21F21E20E16F21F21E20E16F21F21E20E16F21F21E20E16F21F21E16E20E16F21F21E16E20E166.09'6.09'SITE INFORMATIONSite Address:1600 Grant Avenue SouthLegal Description:PCL "A" of Renton LLA#LUA 17-00649 REC#20190131900001SD LLA being located in NE 14 of SW of STR 20-23-05Parcel Numbers:202305-9052 Land Use Zone:Single Family ResidentialZoning:RM-FSite Area: 93,100 SFImpervious Area:61,942 SFUnit Count:Unit E16 12Unit E20 8Unit F2116Total 36 UnitsParking:Required Stalls 61 (see calculation on this sheet)Proposed Stalls:Attached Garage Stalls72On Street Parking7 Parallel stallsTotal: 79 StallsFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKINGFIRE LANE NO PARKING NOTE: LANES SHALL BE IDENTIFIED BY AFOUR INCH (4") WIDE LINE AND CURB PAINTEDBRIGHT RED. THE BLOCK LETTERS SHALL STATE,“FIRE LANE - NO PARKING”, BE EIGHTEEN INCHES(18") HIGH, PAINTED WHITE, LOCATED NOT LESSTHAN ONE FOOT (1') FROM THE CURB FACE, ATFIFTY FOOT (50') INTERVALS.WALL SCONCEALL ALL BUILDINGENTRANCES TYPP5642-31WALL SCONCEALL ALL BUILDINGENTRANCES TYP P5642-31BOLLARDLIGHT TYP.P5245-31WALL SCONCEALL ALL BUILDINGENTRANCES TYP P5642-31BOLLARDLIGHT TYP.P5245-31SITE BUFFERSIGNTREE PRESERVATION SIGNTREE PRESERVATIONSIGNARCH.DESCRIPTIONSIGNARCH. DESCRIPTION SIGNOVERALL SITEDESCRIPTIONSIGN10.22'REQUIRED 10' PLANTING BUFFERMAILKIOSKMAILKIOSKMAIL KIOSK18-P COMMERCIAL 4C PEDESTAL MAILBOX4.34'12'TRAVELLANE8'DEC.PAVE 20'FIRE LANE 20' FIRE LANE25.5'13.34'6.09'25'6.09'12.84'6.09'12'TRAVELLANE 8'DEC.PAVE20'FIRE LANE 20' FIRE LANE 20' FIRE LANEOpen SpacePrivate Required = 9,000 S.F. (250 S.F. per unit)Min. Dim Required=8'-0"Common Required = 12,600 S.F. (350 S.F. per unit)Min. Dim Required=40'-0" AveragePrivate Provided = 9,851 S.F.(223.5-346.5 S.F. per unit)Min. Dim Provided=12'-5"Common Provided = 12,219 S.F.(14,678 S.F. w/tree preservation)Min. Dim Provided=56'-0" Average[(75.53+87.84+13.09+77.51+12.69+77.51+25.97+61.68+21.34+115.27)/10]Parking consists of private enclosed stalls at each individual unitand 7 parallel guest stalls.Private garage stalls are 8.5x16 (based on earlier size requirements. garageslabs are already installed so no room to increase stall size)Guest parallel stalls are 9x23Parking: 3 Bedrooms Units 1.6 = 38.4 Spaces Required (48 Provided)Parking: 2 Bedrooms Units 1.4 = 16.8 Spaces Required (24 Provided)Parking: Guest 10% required parking = 5.52 Spaces Required (7 provided)Room for bike parking is provided in the garage of every F21 and E16 unit.Bike parking: Attached dwelling units .5 = 18 Spaces Required (28 Provided)23'23'23'9'GREEN &SEATINGSPACE1,014 SFGREEN &SEATINGSPACE983 SFKey Legend Cont.Asphalt Travel LaneSaw-cut Decorative Concrete SurfaceConcrete WalkwaysA2SITE PLAN 1" = 20'-0" 4-3-2017 PERMIT CORRECTIONJob No.:Sheet No.:No.DateScale:Drawn By:Date:Date Plotted:Sheet Order: A B U F R E S D BE25 Central Way, Suite 210Kirkland, Washington 98033P: 425.454.7130 F: 425.658.1208M i l b r a n d tA r c h i t e c t sWeb: www.milbrandtarch.com4-7-23 Copyright 2012 Milbrandt Architects, INC., P.S. All rights reserved. GRANT PLACE TOWNHOMES A 36 Townhome Unit Development City of Renton, Washington Satwant Singh1529 Building SummaryUnit Count per Bldg.Area (sf.)Bldg.Unit TypesLowerMainUpperTotalsNo.E16E20F21TotalGarageHeatedPorchHeatedHeatedGarage + PorchesHeatedAll12125234073420932233076254970339582Building SummaryUnit Count per Bldg.Area (sf.)Bldg.Unit TypesLowerMainUpperTotalsNo.E16E20F21TotalGarageHeatedPorchHeatedHeatedGarage + PorchesHeatedAll2 & 31124182770016026592530198758897876Building SummaryUnit Count per Bldg.Area (sf.)Bldg.Unit TypesLowerMainUpperTotalsNo.E16E20F21TotalGarageHeatedPorchHeatedHeatedGarage + PorchesHeatedAll42125234073418832233076252870339561Building SummaryUnit Count per Bldg.Area (sf.)Bldg.Unit TypesLowerMainUpperTotalsNo.E16E20F21TotalGarageHeatedPorchHeatedHeatedGarage + PorchesHeatedAll52125234073418832233076252870339561Building SummaryUnit Count per Bldg.Area (sf.)Bldg.Unit TypesLowerMainUpperTotalsNo.E16E20F21TotalGarageHeatedPorchHeatedHeatedGarage + PorchesHeatedAll6&71124182770016026592530198758897876Building SummaryUnit Count per Bldg.Area (sf.)Bldg.Unit TypesLowerMainUpperTotalsNo.E16E20F21TotalGarageHeatedPorchHeatedHeatedGarage + PorchesHeatedAll82125234073420932233076254970339582