2021.0237.PR0007 Trip Gen DistroJJTTEE .. JJaakkee TTrraaffffiicc EEnnggiinneeeerriinngg,, IInncc.. .. Mark J. Jacobs, PE, PTOE
President
2614 39th Ave. SW – Seattle, WA 98116 – 2503
Tel. 206.762.1978 - Cell 206.799.5692
E-mail jaketraffic@comcast.net
\\Jte_inc\c\~Project Files\2019.035 - Nisqually Landing Apartments - Iris Group - Yelm\NisquallyLandingApartments-TrafficLetter.doc
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July 15, 2019
CITY OF YELM
Attn: Tami Merriman, Associate Planner
106 2nd Street SE
Yelm, WA 98597
Re: Nisqually Landing Apartments – Yelm
Traffic Memorandum – Trip Generation and Distribution
Dear Ms. Merriman,
I am pleased to provide this Traffic Generation and Distribution for the 50 units Nisqually
Landing Apartments project. The site is located at 10721 103rd Ave. SE on Thurston County
Parcel #64303100500. Access to the 50 unit 3-story (mid-rise) apartment project is via a
driveway on 170th Street Southeast, future SR – 510 bypass.
Preliminary site traffic and distribution information was provided to the City via e-mail on July
11, 2019. This Traffic Letter formally documents the traffic generation and distribution of
the development. In addition the site access is inspected and the City’s Transportation
Facility Charge calculated. Below is an aerial view of the site obtained from Thurston County
GeoData:
103rd Ave. SE
170th St. SE (SR-510)SR-510 (Future)
Project Site
JTE, Inc.
CITY OF YELM
Attn: Tami Merriman, Associate Planner
July 15, 2019
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The site is currently developed with a single family home that is to be removed to make way
for the proposed project. A copy of the Preliminary Site Plan prepared by IRIS Group Civil
Engineers dated July 9, 2019 is attached. The plan depicts the 50 units apartment project in
two 3-story buildings, a clubhouse, parking for 116 vehicles including 44 garage stalls ,
internal circulation and access to 170th Street Southeast.
Site Traffic Generation
Definitions
A vehicle trip is defined as a single or one direction vehicle movement with either the origin
or destination (exiting or entering) inside the proposed development.
Traffic generated by development projects consists of the following types:
Pass-By Trips: Trips made as intermediate stops on the way from an origin to
a primary trip destination.
Diverted Link Trips: Trips attracted from the traffic volume on a roadway within
the vicinity of the generator but which require a diversion from
that roadway to another roadway in order to gain access to
the site.
Captured Trips: Site trips shared by more than one land use in a multi-use
development.
Primary (New) Trips: Trips made for the specific purpose of using the services of
the project.
Trip Generation
The Institute of Transportation Engineers Trip Generation 10th Edition provides trip
generation data for a variety of Land Use Codes (LUC’s). Review of the ITE data indicates the
existing use is classified as Single Family Detached Housing and the propose use is
Multifamily Housing (Mid-Rise); ITE LUC’s 210 and 221, respectively. All site trips made by
all vehicles for all purposes, including commuter, visitor, and service and delivery vehicle
trips are included in the ITE trip generation values.
I have included the ITE trip rate information for the Multifamily Housing (Mid-rise) in the
Appendix to this letter.
Using the aforementioned LUC, Table 1 below depicts the site traffic generation.
JTE, Inc.
CITY OF YELM
Attn: Tami Merriman, Associate Planner
July 15, 2019
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The proposed 50 unit Nisqually Landing Apartments is projected to generate about 21 net
new PM peak hour trips to the City’s street grid.
The site’s proximity to the Wal-Mart would allow residents of the Apartment facility to walk in
lieu of driving for grocery type trips in particular; thus a potential for even fewer vehicular
trips than noted.
Distribution
Project generated trips are projected to disperse as follows:
Ø Current street grid; 20/80% to and from the north and south, respectively.
Ø Future street grid could shift 30 to 40% of the site traffic to and from the north thus
50 to 60% and 50 to 40% to and from the south
The distribution is based on the characteristics of the street network, existing traffic volume
patterns, the location of likely trip origins and destinations (residential, schools, employment,
shopping, social and recreational opportunities).
Site Access Inspection
Site access is onto 170th Street Southeast (future SR -510). Access to 103rd Ave. SE is not
feasible due to wetland. Good sight lines exist at the proposed driveway presuming no
obstructions such as vegetation, improperly placed signage and the like are installed in the
sight triangle.
The future SR-510 geometrics indicate one southbound travel lane, a two way left turn lane
and two northbound lanes. The TWLTL facilitates left turning traffic into and out of the site
and the projected site traffic is such the access would operate at a good level of service
JTE, Inc.
CITY OF YELM
Attn: Tami Merriman, Associate Planner
July 15, 2019
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(better the LOS ‘D’, the City operating standard is LOS ‘D’ in commercial and light industrial
zones, YMC 18.16.030A.2) based on Traffic Engineering Inspection.
Traffic Impact Mitigation
The City of Yelm has a transportation mitigation program for new land developments per
Resolution No. 560 approved August 25, 2015. The City’s Transportation Facilities Charge is
$1,497 per net new PM peak hour trip. Table 2 below depicts the projected Traffic Facility
Charge for the project.
The projected TFC for the project is $31,452. In addition, the City will require that the project
site accesses and circulation be constructed in conformance to City requirements.
Summary
This letter has documented the projected trip generation and distribution for the proposed
Nisqually Landing Apartments Plat project. In addition, I inspected the site access and
calculated the TFC for the project. Payment of $31,452 to the City and constructing the site
access and circulation per applicable City requirements will be required.
Please contact me at 206.762.1978 or email me at jaketraffic@comcast.net if you have any
questions.
Sincerely,
DRAFT
Mark J. Jacobs, PE, PTOE, President
JAKE TRAFFIC ENGINEERING, INC
MJJ: mjj