2019.0484.PR0010 Wyndstone Traffic AssessmentHEATH & ASSOCIATES, INC Transportation and Civil Engineering
2214 Tacoma Road Puyallup WA 98371 (253) 770 1401 Fax (253) 770 1473 heathtraffic.com
November 7, 2019
Mr. Craig Deaver
CES NW, Inc.
429 29th Street NE, Suite D
Puyallup, WA 98372
Subject: Wyndstone – Yelm Traffic Assessment
The intent of this assessment serves to provide trip generation analysis for the proposed
development of 75 apartment units in the city of Yelm. The subject site is located on 4.31-acre
parcel #: 21724420300. A description of the project summary is provided below.
Proposed Project
Wyndstone is a proposed apartment development comprised of 75 multi-family dwelling units
located in the city of Yelm. The subject site is comprised within undeveloped 4.31-acre parcel #:
21724420300. The subject site is bordered to the west by Durant Street SE and to the north by
Tahoma Boulevard SE. Nearby land use is a mixture of residential, school and undeveloped.
Access to the site is proposed via one new roadway extending south from Tahoma Boulevard SE.
A provided site plan illustrating the overall configuration of the project is presented in Figure 1 on
the following page.
Aerial Vicinity
N
FIGURE 1
HEATH & ASSOCIATES
TRAFFIC AND CIVIL ENGINEERING
WYNDSTONE - YELM
SITE PLAN
Transit Service
A review of the Intercity Transit regional system map indicates the nearest transit route in
the area is served via Route 94. Service is provided from the Olympia Transit Center to
the Yelm Walmart from the hours of 5:34 AM to 9:45 PM. The nearest stop with respect to
the subject site is located at the intersection of Tahoma Boulevard SE / Killion Road SE &
SR-510 (~0.25 miles northeast), offering 30-minute headways during peak travel times.
Limited weekend service is also provided. Refer to the Intercity Transit route schedule for
more detailed information.
Trip Generation
Trip generation is defined by the number of vehicular movements that enter or exit a
site during a particular timeframe such as a specific peak hour or an entire day. Trip
generation estimates are based on data from the ITE Trip Generation Manual, 10th
Edition. Corresponding the proposed development with ITE data, the following land use of
LUC 220 – Multi-Family Low-Rise was applied. Attached to this document are excerpts
from the ITE manual for the utilized land use. Table 1 below summarizes the estimated
trip volumes using average rates.
Table 1: Project Trip Generation
Land Use Dwelling
Units AWDT
AM Peak-Hour
Trips
PM Peak-Hour
Trips
In Out Total In Out Total
Multi-Family 75 549 8 27 35 26 16 42
The proposed development of 75 multi-family units is estimated to generate 35 new AM (8
in / 27 out) and 42 new PM (26 in / 16 out) peak hour trips. Figure 2 on the following page
illustrates the project’s PM peak hour trip distribution and assignment with full-buildout.
The main arterial route to and from the subject site is by way of Tahoma Boulevard SE.
f
N
HEATH & ASSOCIATES
WYNDSTONE - YELM
TRAFFIC AND CIVIL ENGINEERING PM PEAK HOUR TRIP DISTRIBUTION & ASSIGNMENT
FIGURE 2
Proposed Access
Access to the site is proposed via one new drive access off Tahoma Boulevard SE (see
Figure 2). Assessments of the approximate driveway location were made to establish
whether sufficient entering sight distance (ESD) is available. Based on the 35 -mph speed
limit of Tahoma Boulevard SE, AASHTO guidelines' would require 335 and 390 feet of
unobstructed view for outbound right- and left -turn movements, respectively. Preliminary
examinations of the proposed access point location indicate sight distance is met. While
horizontal curvature occurs along Tahoma Boulevard SE to the northeast of the proposed
access location, it does not impede the necessary sight lines.
Conclusion
The proposed Wyndstone development consists of 75 multi -family apartment units on
parcel #: 21724420300 with a site address of 15025 Tahoma Boulevard SE. The subject
site, located in the city of Yelm, is bordered to the north by Tahoma Boulevard SE and to
the west by Durant Street SE. Based on ITE data, the project is anticipated to be a
moderate generator of traffic with approximately 35 AM (8 in / 27 out) and 42 PM (26 in /
16 out) peak hour trips. A site plan illustrates one proposed access drive on Tahoma
Boulevard SE with acceptable sight lines.
Based on the above analysis the project is subject to Traffic Impact Fees (TIF) as required
by the city of Yelm. Exact fees and calculations will be determined by the City at the time
of building permit issuance.
Please call if you require anything further.
Sincerely,20720
4
GIST- 4
Gregary B. eath, P.E., PTOE �SsroNAL`�1�
1 AASHTO. "A Policy on Geometric Design of Highway and Streets" 8th Edition. (2018).
1/6/2018 https://itetripgen.org/PrintGraph.htm?code=220&ivlabel=UNITS220&timeperiod=AWDVTE&x=&edition=385&IocationCode=General Urban/Subur...
Multifamily Housing (Low -Rise)
(220)
Vehicle Trip Ends vs: Dwelling Units
On a: Weekday
Setting/Location: General Urban/Suburban
Number of Studies: 29
Avg. Num. of Dwelling Units: 168
Directional Distribution: 50% entering, 50% exiting
vehicle i rip generation per Dwelling unit
Average Rate Range of Rates Standard Deviation
7.32 4.45-10.97 1.31
Data Plot and Equation
5,000
4,000
U)
Lu 3,000
.2-
2,000 2,000
1.000
0
X
�X
X
X
X
X
X
X
XX
0 100 200 300 400 500 600
X = Number of Dwelling Units
X Study Site Fitted Curve - - - - Average Rate
Fitted Curve Equation: T = 7.56(X) - 40.86 Rz= 0.96
Trip Generation Manual, 10th Edition a Institute of Transportation Engineers
https://itetripgen.org/PrintGraph.htm?code=220&ivlabel=UNITS220&timeperiod=AWDVTE&x=&edition=385&IocationCode=General%20Urban/Suburb... 1/1
1/6/2018 https://itetripgen.org/PrintGraph.htm?code=220&ivlabel=UNITS220&timeperiod=TASIDE&x=&edition=385&IocationCode=General Urban/Suburb...
Multifamily Housing (Low -Rise)
(220)
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: 42
Avg. Num. of Dwelling Units: 199
Directional Distribution: 23% entering, 77% exiting
Vehicle i rip generation per Dwelling unit
Average Rate Range of Rates Standard Deviation
0.46 0.18-0.74 0.12
Data Plot and Equation
300
U)
Lu
fl- 200
H
u
100
0
0
X X
X
XX
X
X
X X
XX X X X
X�
-X
)�X X
X
X X
200 400
X = Number of Dwelling Units
X Study Site Fitted Curve
Fitted Curve Equation: Ln(T) = 0.95 Ln(X) - 0.51
600
- - - - Average Rate
R2= 0.90
Trip Generation Manual, 10th Edition a Institute of Transportation Engineers
https://itetripgen.org/PrintGraph. htm?code=220&ivlabel=U N ITS220&ti meperiod=TAS I DE&x=&edition=385&IocationCode=General%2OU rban/Suburban ... 1/1
1/6/2018 https://itetripgen.org/PrintGraph.htm?code=220&ivlabel=UNITS220&timeperiod=TPSIDE&x=&edition=385&IocationCode=General Urban/Suburb...
Multifamily Housing (Low -Rise)
(220)
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: 50
Avg. Num. of Dwelling Units: 187
Directional Distribution: 63% entering, 37% exiting
Vehicle i rip generation per Dwelling unit
Average Rate Range of Rates Standard Deviation
0.56 0.18 - 1.25 0.16
Data Plot and Equation
500
400
U)
c
Lu
Q
300
u
H
200
100
X
0
XX
"X " X
XX X 'x
X X
.. X
X
0 200 400 600
X = Number of Dwelling Units
X Study Site Fitted Curve - - - - Average Rate
Fitted Curve Equation: Ln(T) = 0.89 Ln(X) - 0.02 R2= 0.86
Trip Generation Manual, 10th Edition a Institute of Transportation Engineers
https://itetripgen.org/PrintGraph.htm?code=220&ivlabel=UNITS220&timeperiod=TPSlDE&x=&edition=385&IocationCode=General%2OUrban/Suburba... 1/1