HomeMy WebLinkAboutEX_12_RS_Traffic_Study_230426_V1GRANT PLACE TOWNHOMES
Renton, WA
TRIP GENERATION ASSESSMENT
April 26, 2023
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Grant Place Townhomes Trip Generation Assessment
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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:
04/26/2023
Digitally signed by Aaron Van Aken
Date: 2023.04.26 10:59:57-07'00'
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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
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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
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FIGURE 2SITE PLANGRANT PLACE TOWNHOMESN 5DocuSign Envelope ID: E5C77ED5-CC36-4002-B927-1548FF65ACF2
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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
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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
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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.
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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.
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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
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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
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Grant Place Townhomes Trip Generation Assessment
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GRANT PLACE TOWNHOMES
TRIP GENERATION ASSESSMENT
APPENDIX
ITE SHEETS
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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
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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
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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
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GRANT PLACE TOWNHOMES
TRIP GENERATION ASSESSMENT
APPENDIX
ORIGINAL 2014 TRAFFIC ASSESSMENT
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GRANT PLACE TOWNHOMES
TRIP GENERATION ASSESSMENT
APPENDIX
SITE PLAN
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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 + PorchesHeatedAll82125234073420932233076254970339582DocuSign Envelope ID: E5C77ED5-CC36-4002-B927-1548FF65ACF2