TIA~i-ui-oi ir:'aU FROM-THE TRpN5P0 GROUP INC,
The Transco Group, Inc.
~~~~® 11730 118 Avenue NE
Suits 600
~±.,,,,n Kirkland, WA 98034-7120
r4258256d34 T-456 P D1/13 F-1 H4
FA)C
TRANSNfITTAL
Date: November 1, 2001
To: Mark Rosgay
Shelter Resources
~ Project Number.' 07283 00
From: Kevin L. Jones, P.E. ,
The Transpo Group,
Phone: (425) 454-8205 Phone: (425) 821-3665
Fax: (425) 455-8546
Fax: (425) 825-8434
p CC: Ron Vigil (206) 523-0051 j Pages including cover sheet: 13
Subject: Prairie Run Low-Income Apartments, Limited Traffic Study
Remarks: ^ Urgent ^ Reply ASAP ^ For your review Original to follow by mail
Mark, f
Per your request, I've finalized our letter. I'm putting copies in the mail to you and Catherine
at the Gity of Yelm (Ron, I'm assuming a faxed copy will suffice for your needs).
Let Jennifer or I know if we can be of further assistance. Good luck!
Kevin
L?
`'J7
11-d1-01 17:31
fRGM-THE TRANSPG CRGUP INC,
+dZ53258d3d
T-45i
02/13
F-184
1~'ovember 1, 2001
TG: 02283.00
Ms. Catherine Carlson
Community Development Director
Ciry of Yelm
105 Yelm Avenue ~'.
P.O. Box 479
Yelm, t't~A 98597
SUBJECT: TRAFFIC STUDY FOR PRAIRIE RUN LOW-INCOME APARTMENTS
Deaz Ms. Carlson:
It is our understanding that the Ciry of Yelm is requiring a limited traffic study to evaluate potential
transportation-related impacts of the subject project. Specifically, the City requested an evaluation of
traffic safety at the intersection of W Yelm Avenue/NW .'Vountain View Road. This intersection is
located approximately 500 feet south of the proposed development and it is anticipated that neazly all,
if not all, ofproject-generated traffic would access the site via this intersection. Due to the north-
south orientation of NW Mountain View Road and the northwest-southeast orentadon of W Yelm
Avenue, these roadways do not intersect at a 90 degree angle. As such, our analysis of potential
impacts includes traffic safety at this intersection, especially related to left-turn type accidents.
To make sure this study meets the City's requirements, we coordinated its scope in advance via a-mil
communications on October 22, 2001. The following provides a description of the proposed project,
`adjacent roadway network, existing and future traffic volumes, transit service, and traffic safety. The
study also estimates PM peak hour trip generation and assigns project traffic at W Yelm Avenue/I~'W
Mountain View Road based on aip distribution information provided by The Shea Group. Lastly, we
identify traffic volume and Traffic safety impacts as weL as address necessary mitigation measures,
including the required transportation facility charge (TFC).
Project Description
The project site is located at 205 NZX' Mountain View Road in Ye1m, Washington. The proposed
project would consist of 321ow-income apaztment units, including eight three-bedroom units and 24
two-bedroom units (seven units would be handicap-accessible). his assiuned that the project wouid
be constructed and occupied by 2002.
Roadway Network
Pr'W Mountain View Road is a local access saner oriented in the north-south direction. It includes
two 9-foot wide travel lanes and a posted speed limit of 25 rtnles per hour (mph). This roadway does
not curently include pedestrian facilities (sidewalks, pared/gravel shoulders). The southbound
approach at the ~~~ Yelm Avenue/I~l~k' Mountain View Road is controlled with a stop sign and
includes a single lane for lefo- and right-turning traffic.
1i-O1-01 17:32 FROM-THE TRANSPO GROUP INC,
Ms. Catherine Carlson
November 1, 2001
Page 2 of 6
+4258258434 T-d54 P 03/13 F-184
T ~irans o
~p
W Yelm Avenue (SR 510) is an arterial oriented in the northwest-southeast direction. It includes two
11-foot wide travel lanes and a posted speed limit of 35 mph. Adjacent to Yelm High School (YHS),
Ilashing beacons indicate a reduced speed limit of 20 mph. Pedestrian facilities exist on both sides of
this roadway, These facilities include 5- to 10-foot wide paved shoulders and a 4-foot wide paved
pedestrian pacnway on the northeast side of W Yelm Avenue, southeast of Iv-VU Mountain View Road.
A pedestrian crosswalk is located approximately 50 feet southeast of NW Mountain View Road. At
L'te intersection of W Yelm Avenue/NW Mountain View Road, d:e northwestbound approach is
uncontrolled and includes a single lane for through and righo-tuzning traffic. 'The sourheastbound
approach is also uncontrolled and includes a single lane for through and left-turning ccaffic.
The southwest leg of W Yelm Avenue/NVG' Mountain View Road serves traffic exiting YHS (a
second driveway located approximately 625 feet northwest of this intersection serves traffic entering
YHS). The northeastbound approach is controlled with a stop sign and includes two lanes, one for
!eft-turning traffic and one for through and right-turning a'aFFic.
Traffic Volumes
Existing PM peak period (4:30-6:30 P~~ traffic volumes were collected at the intersection of W Yelm
Avenue/NW Mountain View Road on Thursday, October 18, 2001 (see attached). The PM peak
hour was determined to be 4:30-5:30 PM. Figure 1 illustrates existing PM peak hour traffic volumes
at this intersection. Traffic volumes were rounded to the nearest 5 vehicles since weekdav volumes
typically fluctuate day-to-day. W Yelm Avenue/Iv'W Mountain View Road currently processes
approximately 2,550 vehicles during the PM peak period and 1,350 vehicles during the Prit peak hour.
At the recommendation of Ciry staff, 2002 without-project PM peak hour traffic volumes wcxe
estimated by increasing existing volumes by 4 percent per year. This growth rate is based on recent
growth in the area and accounts for growth in both background traffic and traffic associated with
development projects in the "pipeline." Figure 1 also illustrates future peak hour traffic volumes at
the 1X~ Yelm Averuc/NW Mountain View Road intersection. It was assumed that YHS traffic
volumes would not increase at this rate and as such, existing northeastbound traffic volumes were
assumed to rerlect future without-project traffic volumes. Based on projections, it is estimated that
this intersection will process approximately 1,400 PM peak hour vehicles in 2002.
Transit Service
Intercity Transit currently provides weekday transit service along W Yelm Avenue. Transit stops For
Routes 92 and 94 exist on both sides of W Yelm Avenue, 125-150 feet southeast of 1\~' Mountain
View Road. Since the project site is located approximately 500 feet north of W' Yelm Avenue, it is
likely that some residents of the proposed project would choose to travel via transit by walking the
short distance to/from these transit stops.
Route 92 is described as the "South County Special" and includes Frida}' sere•ice between the Little
Prairie Cer_ter and the Ciry of Rainier. Transit stops in the northwescbound direction occur between
9:00 AIvI and 3:00 Piv1 with two-hour headways. Similarly, stops ir. the southeastbound direction
.._- ~nwrinC IRAIYJYU 6HUUP INS,
Ms. Catherine Carlson
November ], 2001
Page 3 of b
+4['58258434 ?-dSd D Cdi13 F-184
Transpo
Group
occur every two hours between 10:00 AM and 2:00 PM. Route 92 does not provide service Monday>
threugl; Thursday nor oa weekends.
Route 94 includes weekday service between Y'elm's Nisqually Plaza and downtown Olympia Transit
stops to the northwestbound direction occur twice during the morning commute (6:00 A1~S and 7:00
AM) and twice during the evening commute (5:10 PM and 6:10 PM). Stops in the sounc~astbound
direction occur at approximately 6:45 Alv1, 4:50 PM, and 5:50 PM. Route 94 does not provide
weekend transit service.
Traffic Safety
Since W Yelm Avenue is also designated as SR 510, the Washington State Depaxnrtent of
Transportation (WSDOT) was contacted to determine if the W Yelm Avenue/NW Mountain View
Road intersection is currently identified as a hazazdous accident location (HAI) or located within a
high accident corridor (HAC). WSDOT identifies potentially unsafe locations as either HALs or
HACs based on the frequency and type of accidents. HAIs are defined as roadway sections having
experienced a higher than average rate of severe accidents (as compared with similar types of fa;:ilities
in the state) within the most recent two-year period. HACs are defined as corridors having
experienced a higher than average rate of sevexe accidents within the most recent five-yeaz period. It
was detezrnined that no HAhs or HACs exist on W Yelm Avenue in the vicinity of NW Mountain
View Road.
Traffic accident records at the intersection of W Yelm Avenue/NW Meuntain View Road were
obtained from WSDOT for the most-recent three-year period between January 2, 1998 and
December 31, 2000 {see attached). Even though this location is not identifed as a fzAL, nor located
within a HAC, these records were reviewed to determine if traffic safety is affected by the existing
intersection alignment, especially as it relates to left-turning movements. Table I illustrates the annual
number of accidents that were reported within 45U feet northwest and southeast of the ix' Yelm
Ac>enue/NW Mountain View Road intersection.
Table 1
nnnual
I~,~s MVO ~nou rotel a~,~,,,,1~
W Yelm Ave/NW Mountain Vlew Rd 0 ~ 4 a 2.67 0.43
This table illustrates that W Yelm Avenue/N W Mountain View Road experienced, on average, :ewer
than three accidents per year throughout the Three-ye .r period, including no accidents in 7998. Threw
of the eight mported accidents resulted in evident or possible injuries and none resulted in a fatality.
11-01-01 17:35 FROM-THE TRAi~$PO GROUP INC, +4256258434 T-454 P.05/13 F-18d
Ms. Catherine Carlson
November 1, 2001
Page 4 of G
'he
Transco
Group
Typically, the number of accidents at unsignalized intersections is considered high when the average
number of accidents exceeds five per year. Since W Yelm Avenue j 1V~X% Mountain View Rozd
experienced, on average, fewer than three accidents per year, it is not considered ahigh-accident
location. Similarly, in general, an intersection is classified as a moderate- to high-accident location if is
experiences more than ore accident per one millior. entering vehicles. Based on recent accident data
and existing traffic counts, it was determined that this intersection experienced approximately 0.43
accidents per one million entering vehicles. Therefore, considering its traffic control and traffic
volumes, this intersection has not experienced an unusually high number of accidents in recent yeazs.
A collision diagram was prepared to graphically depict the accidrnt histon,• within 450 feet northwest
and southeast of \X% Yelm Avenue/NW Mountain View Road (see attached). This diagram illustrates
that the majoricl of reported accidents (five of eight) ware rear-end type accidents. The three
remaining accidents involved left-taming movements, including nvo at NVZ' Mountain View Road
(milepost 14.73). A total of three accidents were reported at ~Y~ Yelm Avenue/NW Mountain View
Road with the majority of remaining accidents occurring southeast of this intersection.
Trip Generation
Project trip generation was preL'minarily estimated based on average trip rates published by the
Institute of Transportation Engineers (ITE) in Trip Generation (6'" Edition, ? 997). Based on nearly 80
trp generation studies of existing apartments, this document describes an average weekday PM peak
hour trip rate of 0.62 nips per occupied dwelling unit. Multiplying this race by the 32 proposed units,
it is estimated that an apaztment project of this size would generate approximately 20 trips during the
PM peak hour.
Ho~x-ever, since this project would provide housing for low-income individuals and families, it is like!c
that it would generate fewer PM peak hour trips as compared to a conventional apartment project of ~~ ,9-
simlar size. In the City of Seattle's Proposed Amendments Relating to ilfirinrum Parking Requirements for ~e~ ~ J'
Mulii-Family User Setxrng Low-Intome Fr'ouseboldr (dated August 9, 2001), the Puget Sound Regional ~~U,r
Council (PSRC) summarized the average number of vehicles available by household income. This L ~
summary illustrates that as household income increases, the average number of vehicles available also~~'~~
increases (see attached table). For example, the average number of vehicles available for a household ~,~
income of $0,000-$55,000 is 1.97. This number reduces to 1.37 for a household income of $25,000-
$27,500 and represents a reduction of approximately 30 percent. Based on this information, it is
reasonable to assume that aloes-income household would generate fewer daily and peak hour trips
than amedian-income household, regardless of the availability of transit and convenience of ocher
travel modes.
Based on information from the Lnited States Department of Housing and t-rban Development
(HL;D), the 2001 median house'old income in the Olympiz area is 551,900. The proposed apartment
project would provide housing for "very low-income" indivi uals and families. HI;D defines this
income level as ~0 percent of chc median ($2,950). As des 'bed above, the average number of
vehicles available for a household income of 525,000-52 i,~0 is approximately 3G percent lower that.
a household income of S50,000-5»,000. Assuming that a si : tar reduction would apply to trip
~~ {~~" ~ /1~~
~-
11-pi-ia 1f:36 FROM-THE TRANSPC GR!)UP INC,
Ms. Catherine Carlson
November 1, 2001
Page 5 of G
+4258258434
i-454 P 06/13 F-184
Trar~spo
Group
generation, the proposed apatttnent project would generate 30 percent fewer trips as compared with a
conventional apartment project of similar size.
Therefore, it is estimated tl:ac the proposed 32-unit project would generate 14 trips (20 trips x 0.70)
3.Ling the PM pea.4 hour. Based on average directional splits published in Trig G'enerution, the project
would generate 9 inbound trips and 5 outbound trips. Even though it is likely that some residents of
the proposed project would travel via transit {as mentioned earlier, the project site is located
approximately $00 feet norrh of transit stops on V6' Yelm Avenue), to be conservative, trip generation
estimates were not further reduced.
Trip Distribution and Assignment
Distribution ofproject-generated Phi peak hour traffic volumes was based on infotrnation proczdcd
by The Shea Group, transportation consultant for the Ciry of Yeim. The directional distribution of
traffic oriented to/from the site was estimated using the County-wide transportaton model created by
the Thurston Regional Planning Council (fRPC). Bzsed on this model, it is estimated that 38 percent
ofproject trafnc would access the site via W Yeim Avenue northwest of NW Mountain View Road
and 62 pexcenc via ~`U Yelm Avenue southeast of N W' Mountain View Road. Figure ? illusaates the
assignment of project traffic at the intersection of lY YeIm Avenue/lV'W Mountain View Road.
Traffic Volume Impaet
Project-generated PM peak hour traffic volumes were added to 2002 without-project volumes at W
Yelm AvenueJslW' Mountain View Road. The resulting 2002 with-project traffic volumes are
illustxated in Figure 1. During the PM peak hour, vaffic attributable to the proposed project would.
increase total entering traffic volumes by approximately 1 percent ar this location.
Traffic Safety Impact
There could be a proportionate increase in the probabi/ir~ of traffic accidents with the addition of
project traffic. However, considering the relatively small increase in PM peak hour traffic attributable
to the project (1 percent), it is unlikely that this increase would create a safety hazard or significantly
increase the number or"reported accidents ac W Yelm AvenuejlVW ?Mountain View Road. In fact,
based on the attached co]L'sion diagram, there were no reported accidents associated with either the
southbound left-turning movement or tae southeastbound left-turning movement (t is estimated that.
the project would add 3 trips to these turning movements during the PM peak hourj. Therefore,
based on recent accident records and the small increases in traffic associated w7ti these left-corning
mover.~eats, it is unlikely that the number of left-turn type accidents would increase signifcanty due
to the addition ofproject traffic.
Furthermore, hiving experienced fewer than five accidents prr year and less than one accident per
ore million entering vehicles during tie most-recent three-year period, this intersection is not
considered ahigh-accident locator.. tF'SDOT substantiates this conclusion as ~' Yelm Avenue;'I~'VG'
iViountain View Road is not identified as a I~~I. nor located within a H.~1C. Therefore, the addition.
ofproject traffic would not exacerbate an existing traffic safety hazard.
11-ul-Oi 17:38 FROM-TNE TRANSPD GROUP NC, +425825&434 T-454 P.07/13 F-I R4
Ms. Catherine Cazlson
November 1, 2001
Page G of 6
Mitigation Measures
Tra o
Based on the above findings, transportation-related impacts of the proposed project wood not
require specific mitigation measures, including improvements ac rlle W' Yelm Avenue/NW 34ountain
View Road intesseedon, tv'evertheless, as part of the City's eoncurrency ordinance, the project would
be required to pay a transportarion facility charge ('I'FC; equivalent to $?50 per new PM peak hoax
aip. As such, the TFC for the proposed project is estimated at X10,500 (14 trips x $750/trip).
We trust that the information provided in This letter meets the City's requirements fot evaluating
potential impacts associated with the proposed project. Do not hesitate ec call me if you have any
quesuonsregarding our evaluation and/of fv~dings.
Sincerely,
The Transpo Group, Inc.
Kevin L. )ones, P.H.
Senior Transportation Hngireer
KLJ/
Attachments
cc: Mark Rozgay, Shelrer Resources
M:\Ol `,01283\ Wp\01285LETLER [.doe
11-01-01 17:38
FRGM-THE TRANSPG GROUP INC,
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11-CI-Oi 17:39 FROIk-THE TRANSPO GROUP INC, +4258258d34 T-454 P.09/13 F-164
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APPENDIX B
Average Vehicles Available by Household Income, City of Seattle, 1990
Important Notes:
1. Census data repons average vehicles available by household income. Actual vehicle
ownership rates -- which may be cnnsiderabfy lower -- are not reported.
2. Census data does not distinguish between households livins in sinsle-family
neighborhoods and these living in multifamily housing arrangements. Consequently,
the acnwl number of vehicles available to multifamily househo;ds only is ro[
available. This is an importar,[ distinction because the City regulates required parking
for these hvo uses differen[(y.
r u,yn onuna r<eyrarurt r_oiu~al. Jniumrv app(
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November 1, 2001
Ms. Catherine Carlson
Community Development Director
City of Yelm
105 Yelm Avenue W.
P.O. Box 479
Yelm, WA 98597
--~.~
NO V p 2001
~.
~...~
the
TI'811SC10
TG: 01283.00
SUBJECT: TRAFFIC STUDY FOR PRAIRIE RUN LOW-INCOME APARTMENTS
Dear Ms. Carlson:
It is our understanding that the Ciry of Yelm is requiring a limited traffic study to evaluate potential
transportation-related impacts of the subject project. Specifically, the City requested an evaluation of
traffic safety at the intersection of W Yelm Avenue/NW Mountain View Road. This intersection is
located approximately 500 feet south of the proposed development and it is anticipated that nearly all,
if not all, of project-generated traffic would access the site via this intersection. Due to the north-
south orientation of NW Mountain View Road and the northwest-southeast orientation of W Yelm
Avenue, these roadways do not intersect at a 90 degree angle. As such, our analysis of potential
impacts includes traffic safety at this intersection, especially related to left-turn type accidents.
To make sure this study meets the City's requirements, we coordinated its scope in advance via e-mail
communications on October 22, 2001. The following provides a description of the proposed project,
adjacent roadway network, existing and future traffic volumes, transit service, and traffic safety. The
study also estimates PM peak hour trip generation and assigns project traffic at W Yelm Avenue/NW
Mountain View Road based on trip distribution information provided by The Shea Group. Lastly, we
identify traffic volume and traffic safety impacts as well as address necessary mitigation measures,
including the required transportation facility charge (TFC).
Project Description
The project site is located at 205 NW Mountain View Road in Yelm, Washington. The proposed
project would consist of 32 low-income apartment units, including eight three-bedroom units and 24
two-bedroom units (seven units would be handicap-accessible). It is assumed that the project would
be constructed and occupied by 2002.
Roadway Network
NW Mountain View Road is a local access street oriented in the north-south direction. It includes
two 9-foot wide travel lanes and a posted speed limit of 25 miles per hour (mph). This roadway does
not currently include pedestrian facilities (sidewalks, paved/gravel shoulders). The southbound
approach at the W Yelm Avenue/NW Mountain View Road is controlled with a stop sign and
includes a single lane for left- and right-turning traffic.
_ _ „ter,,, „n.~. ~..~._..,. ni ~ c....,, inn IlirLl~nrl ~n~o aRn~a-~~~n 475 X71 3fifi5 Fax 4?5.825.8434
The
Transpo
Group
Ms. Catherine Carlson
November 1, 2001
Page2of6
W Yelm Avenue (SR 510) is an arterial oriented in the northwest-southeast direction. It includes two
11-foot wide travel lanes and a posted speed limit of 35 mph. Adjacent to Yelm High School (YHS),
flashing beacons indicate a reduced speed limit of 20 mph. Pedestrian facilities exist on both sides of
this roadway. These facilities include 5- to 10-foot wide paved shoulders and a 4-foot wide paved
pedestrian pathway on the northeast side of W Yelm Avenue, southeast of NW Mountain View Road.
A pedestrian crosswalk is located approximately 50 feet southeast of NW Mountain View Road. At
the intersection of W Yelm Avenue/NW Mountain View Road, the northwestbound approach is
uncontrolled and includes a single lane for through and right-turning traffic. The southeastbound
approach is also uncontrolled and includes a single lane for through and left-turning traffic.
The southwest leg of W Yelm Avenue/NW Mountain View Road serves traffic exiting YHS (a
second driveway located approximately 625 feet northwest of this intersection serves traffic entering
YHS). The northeastbound approach is controlled with a stop sign and includes two lanes, one for
left-turning traffic and one for through and right-turning traffic.
Traffic Volumes
Existing PM peak period (4:30-6:30 PM) traffic volumes were collected at the intersection of W Yelm
Avenue/NW Mountain View Road on Thursday, October 18, 2001 (see attached). The PM peak
hour was determined to be 4:30-5:30 PM. Figure 1 illustrates existing PM peak hour traffic volumes
at this intersection. Traffic volumes were rounded to the nearest 5 vehicles since weekday volumes
typically fluctuate day-to-day. W Yelm Avenue/NW Mountain View Road currently processes
approximately 2,550 vehicles during the PM peak period and 1,350 vehicles during the PM peak hour.
At the recommendation of Ciry staff, 2002 without-project PM peak hour traffic volumes were
estimated by increasing existing volumes by 4 percent per year. This growth rate is based on recent
growth in the area and accounts for growth in both background traffic and traffic associated with
development projects in the "pipeline." Figure 1 also illustrates future peak hour traffic volumes at
the W Yelm Avenue/NW Mountain View Road intersection. It was assumed that YHS traffic
volumes would not increase at this rate and as such, existing northeastbound traffic volumes were
assumed to reflect future without-project traffic volumes. Based on projections, it is estimated that
this intersection will process approximately 1,400 PM peak hour vehicles in 2002.
Transit Service
Intercity Transit currently provides weekday transit service along W Yelm Avenue. Transit stops for
Routes 92 and 94 exist on both sides of W Yelm Avenue, 125-150 feet southeast of NW Mountain
View Road. Since the project site is located approximately 500 feet north of W Yelm Avenue, it is
likely that some residents of the proposed project would choose to travel via transit by walking the
short distance to/from these transit stops.
Route 92 is described as the "South County Special" and includes Friday service between the Little
Prairie Center and the Ciry of Rainier. Transit stops in the northwestbound direction occur between
9:00 AM and 3:00 PM with two-hour headways. Similarly, stops in the southeastbound direction
The
Transpo
Group
Ms. Catherine Carlson
November 1, 2001
Page 3 of 6
occur every two hours between 10:00 AM and 2:00 PM. Route 92 does not provide service Monday
through Thursday nor on weekends.
Route 94 includes weekday service between Yelm's Nisqually Plaza and downtown Olympia. Transit
stops in the northwestbound direction occur twice during the morning commute (6:00 AM and 7:00
AM) and twice during the evening commute (5:10 PM and 6:10 PM). Stops in the southeastbound
direction occur at approximately 6:45 AM, 4:50 PM, and 5:50 PM. Route 94 does not provide
weekend transit service.
Traffic Safety
Since W Yelm Avenue is also designated as SR 510, the Washington State Department of
Transportation (WSDOT) was contacted to determine if the W Yelm Avenue/NW Mountain View
Road intersection is currently identified as a hazardous accident location (HAL) or located within a
high accident corridor (HAC). WSDOT identifies potentially unsafe locations as either HALs or
HACs based on the frequency and type of accidents. HALs are defined as roadway sections having
experienced a higher than average rate of severe accidents (as compared with similar types of facilities
in the state) within the most recent two-year period. HACs are defined as corridors having
experienced a higher than average rate of severe accidents within the most recent five-year period. It
was determined that no HALs or HACs exist on W Yelm Avenue in the vicinity of NW Mountain
View Road.
Traffic accident records at the intersection of W Yelm Avenue/NW Mountain View Road were
obtained from WSDOT for the most-recent three-year period between January 1, 1998 and
December 31, 2000 (see attached). Even though this location is not identified as a HAL nor located
within a HAC, these records were reviewed to determine if traffic safety is affected by the existing
intersection alignment, especially as it relates to left-turning movements. Table 1 illustrates the annual
number of accidents that were reported within 450 feet northwest and southeast of the W Yelm
Avenue/NW Mountain View Road intersection.
Table 1
Annual
'I 1998 1999 2000 Total Average
W Yelm Ave/NW Mountain View Rd 0 4 4 8 2.67 0.43
This table illustrates that W Yelm Avenue/NW Mountain View Road experienced, on average, fewer
than three accidents per year throughout the three-year period, including no accidents in 1998. Three
of the eight reported accidents resulted in evident or possible injuries and none resulted in a fatality.
The
Transpo
Group
Ms. Catherine Carlson
November 1, 2001
Page4of6
Typically, the number of accidents at unsignalized intersections is considered high when the average
number of accidents exceeds five per year. Since W Yelm Avenue/NW Mountain View Road
experienced, on average, fewer than three accidents per year, it is not considered ahigh-accident
location. Similarly, in general, an intersection is classified as a moderate- to high-accident location if it
experiences more than one accident per one million entering vehicles. Based on recent accident data
and existing traffic counts, it was determined that this intersection experienced approximately 0.43
accidents per one million entering vehicles. Therefore, considering its traffic control and traffic
volumes, this intersection has not experienced an unusually high number of accidents in recent years.
A collision diagram was prepared to graphically depict the accident history within 450 feet northwest
and southeast of W Yelm Avenue/NW Mountain View Road (see attached). This diagram illustrates
that the majority of reported accidents (five of eight) were rear-end type accidents. The three
remaining accidents involved left-turning movements, including two at NW Mountain View Road
(milepost 14.73). A total of three accidents were reported at W Yelm Avenue/NW Mountain View
Road with the majority of remaining accidents occurring southeast of this intersection.
Trip Generation
Project trip generation was preliminarily estimated based on average trip rates published by the
Institute of Transportation Engineers (ITE) in Trip Generation (6`'' Edition, 1997). Based on nearly 80
trip generation studies of existing apartments, this document describes an average weekday PM peak
hour trip rate of 0.62 trips per occupied dwelling unit. Multiplying this rate by the 32 proposed units,
it is estimated that an apartment project of this size would generate approximately 20 trips during the
PM peak hour.
However, since this project would provide housing for low-income individuals and families, it is likely
that it would generate fewer PM peak hour trips as compared to a conventional apartment project of
similar size. In the Ciry of Seattle's Proposed Amendments Relating to Minimum Parking Reguirements for
Multi-Family Uses Serving Loin-Income Households (dated August 9, 2001), the Puget Sound Regional
Council (PSRC) summarized the average number of vehicles available by household income. This
summary illustrates that as household income increases, the average number of vehicles available also
increases (see attached table). For example, the average number of vehicles available for a household
income of $50,000-$55,000 is 1.97. This number reduces to 1.37 for a household income of $25,000-
$27,500 and represents a reduction of approximately 30 percent. Based on this information, it is
reasonable to assume that aloes-income household would generate fewer daily and peak hour trips
than amedian-income household, regardless of the availability of transit and convenience of other
travel modes.
Based on information from the United States Department of Housing and Urban Development
(HUD), the 2001 median household income in the Olympia area is $51,900. The proposed apartment
project would provide housing for "very low-income" individuals and families. HUD defines this
income level as 50 percent of the median ($25,950). As described above, the average number of
vehicles available for a household income of $25,000-$27,500 is approximately 30 percent lower than
a household income of $50,000-$55,000. Assuming that a similar reduction would apply to trip
The
Transpo
Group
Ms. Catherine Carlson
November 1, 2001
Page 5 of 6
generation, the proposed apartment project would generate 30 percent fewer trips as compared with a
conventional apartment project of similar size.
Therefore, it is estimated that the proposed 32-unit project would generate 14 trips (20 trips x 0.70)
during the PM peak hour. Based on average directional splits published in Trip Generation, the project
would generate 9 inbound trips and 5 outbound trips. Even though it is likely that some residents of
the proposed project would travel via transit (as mentioned earlier, the project site is located
approximately 500 feet north of transit stops on W Yelm Avenue), to be conservative, trip generation
estimates were not further reduced.
Trip Distribution and Assignment
Distribution of project-generated PM peak hour traffic volumes was based on information provided
by The Shea Group, transportation consultant for the City of Yelm. The directional distribution of
traffic oriented to/from the site was estimated using the County-wide transportation model created by
the Thurston Regional Planning Council ('TRPC). Based on this model, it is estimated that 38 percent
of project traffic would access the site via W Yelm Avenue northwest of NW Mountain View Road
and 62 percent via W Yelm Avenue southeast of NW Mountain View Road. Figure 1 illustrates the
assignment of project traffic at the intersection of W Yelm Avenue/NW Mountain View Road.
Traffic Volume Impact
Project-generated PM peak hour traffic volumes were added to 2002 without-project volumes at W
Yelm Avenue/NW Mountain View Road. The resulting 2002 with-project traffic volumes are
illustrated in Figure 1. During the PM peak hour, traffic attributable to the proposed project would
increase total entering traffic volumes by approximately 1 percent at this location.
Traffic Safety Impact
There could be a proportionate increase in the probability of traffic accidents with the addition of
project traffic. However, considering the relatively small increase in PM peak hour traffic attributable
to the project (1 percent), it is unlikely that this increase would create a safety hazard or significantly
increase the number of reported accidents at W Yelm Avenue/NW Mountain View Road. In fact,
based on the attached collision diagram, there were no reported accidents associated with either the
southbound left-turning movement or the southeastbound left-turning movement (it is estimated that
the project would add 3 trips to these turning movements during the PM peak hour). Therefore,
based on recent accident records and the small increases in traffic associated with these left-turning
movements, it is unlikely that the number of left-turn type accidents would increase significantly due
to the addition of project traffic.
Furthermore, having experienced fewer than five accidents per year and less than one accident per
one million entering vehicles during the most-recent three-year period, this intersection is not
considered ahigh-accident location. WSDOT substantiates this conclusion as W Yelm Avenue/NW
Mountain View Road is not identified as a HAL nor located within a HAC. Therefore, the addition
of project traffic would not exacerbate an existing traffic safety hazard.
The
Transpo
Group
Ms. Catherine Carlson
November 1, 2001
Page 6 of 6
Mitigation Measures
Based on the above findings, transportation-related impacts of the proposed project would not
require specific mitigation measures, including improvements at the W Yelm Avenue/NW Mountain
View Road intersection. Nevertheless, as part of the City's concurrency ordinance, the project would
be required to pay a transportation facility charge (TFC) equivalent to $750 per new PM peak hour
trip. As such, the TFC for the proposed project is estimated at $10,500 (14 trips x $750/trip).
We trust that the information provided in this letter meets the City's requirements for evaluating
potential impacts associated with the proposed project. Do not hesitate to call me if you have any
questions regarding our evaluation and/of findings.
Sincerely,
The Transpo Group, Inc.
Kevin L. Jones, P.E.
Senior Transportation Engineer
KLJ/
Attachments
cc: Mark Rozgay, Shelter Resources
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M:1011012831Cadlgraphic0l <A> lindak 11101101 14:22
YELM, WASHINGTON
NV' UNTAIN VIEW RD
YELNt AVE (SR-510)
LOC# OIPTPG01291M
TRAFFICOUNT, INC.
4820 YELM HWY B-195
LACEY, WASHINGTON 98503
360-491-8116
r~..~~..c PrintoA_ PRIMARY
File Name : TPG29101P
Site Code :00000001
Start Date :10/18/2001
Page No :1
NW MOUNTAIN VIEW RD YELM AVE YELM HS DRVWY YELM AVE
From North From East From South From West
T
ht Thru Left Truck App
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ime g
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1 1.0 1.0 1.0 : 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
04:30 PM .
0 0 3 0 3 6 138 0 0 144 23 1 12 0 36 0 170 1 0 171 0 354 354
04:45 PM 4 0 2 0 6 2 123 0 0 125 15 0 8 0 23 0 166 2 0 168 0 322 322
Tntal 4 0 5 0 9 8 261 0 0 269 38 1 20 0 59 0 336 3 0 339 0 676 676
05:00 PM
05:15 PM
05:30 PM
05:45 PM
Total 2
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3
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it 0
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197
183
179
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187
180
769 0
0
0
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0 348
331
321
324
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331
321
324
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06:00 PM
06:15 PM
GrandTotat
Apprch %
Total% 2
0
16
44.4
0.6 0
0
0
0.0
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2
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0.8 0
0
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2
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0
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94
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103
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2
54
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6
159
6.2 0
0
0
0.0
0.0 166
159
1420
99.0
55.8 1
0
14
1.0
0.5 0
0
0 167
159
1434
56.3 0
0
0
0.0 286
261
2547
100.0 286
261
2547
NW MOUNTAIN VIEW RD YELM AVE YELM HS DRVWY YELM AVE
From North From East From South From West
StartTime Right Thru Left App.Totat Right Thnr Left App. Total Rift Thru Left App. Total Rift Thru Left App
Peak t1DUf tfOlrl V9:3V rm lU vo:1a rrv ~ - roan a ~~ a
tnter5ed10r1 04:30 PM
Volume 9 0 9
Percent 50.0 0.0 50.0
'':30 Volume 0 0 3
:akfactor
High Itd. 04:45 PM
VoWme 4 0 2
Peak Factor
Peak Hour From 04:30 PM to 06:15 PM - Peak i of 1
BN Approach 05:15 PM
Volume 10 0 12
PelcerR 45.5 0.0 54.5
Hier tnt 05:15 PM
Volume 3 0 3
Peak Fedor
18 16 483 2
3.2 96.4 0.4
3 6 138 0
04:30 PM
6 6 138 0
0.750
04:30 PM
22 16 483 2
3.2 96.4 0.4
04:30 PM
6 6 138 0
0.917
501 64 2 29
67.4 2.1 30.5
144 23 1 12
04:30 PM
144 23 1 12
0.870
04:30 PM
501 64 2 29
67.4 2.1 30.5
04:30 PM
144 23 1 12
0.870
95 0 733
0.0 98.9
36 0 170
05:00 PM
36 0 200
0.660
05:00 PM
95 0 759
0.0 98.7
05.00 PM
36 0 200
0.660
8
1.1
1
5
10
1.3
5
.Total Int Total
741 1355
171 354
0.957
205
0.904
769
205
0.938
YELM, WASHINGTON
NW a"'1UNTAIN VIEW RD
YEL .tfE (SR-510)
LOC# O1P TPG01291M
TRAFFICOUNT, INC.
4820 YELM HWY B-195
LACEY, WASHINGTON 98503
360-491-8116
File Name : TPG29101P
Site Code :00000001
Start Date : 10/ 18/2001
Page No : 2
--
NW MOUNTAIN VIEW RD
From North
YELM AVE
From East
YELM HS DRVWY
From South
Y LM A
From West
Start Time Right Thru Left App. Total Right Thru Left App_Total Right Thru Left App. Total Right Thru Left App. Total IrrLTotal
Peak Flour from 04:30 --
PM to 06:15 PM -Peak 1 of 1
Intersection 04:30 PM
Volume 9 0 9 18 16 483 2 501 64 2 29 95 0 733 8 741 1355
Perrxnt 50.0 0.0 50.0 3.2 96.4 0.4 67.4 2.1 30.5 0.0 98.9 1.1
04:30Yolume 0 0 3 3 6 138 0 144 23 1 12 36 0 170 1 171 354
Peakfador 0.957
High Int 04:45 PM 04:30 PM 04:30 PM 05:00 PM
Volume 4 0 2 6 6 138 0 144 23 1 12 36 0 200 5 205
Peak Factor 0.750 0.870 0.660 0.904
NW MOUNTAIN VIEW RD
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SUBJECT: f ~/~/~~ /~~~/ ~/ ~~~ "' T~'E~
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/1998 ~D~)
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.*
APPENDIX B
Average Vehicles Available by Household Income, City of Seattle, 1990
Income
Cate~or Number of
Households Averabe Vehicles
Available
Less than $5.000 13,314 O.S3
$5,000 to $9,999 20,973 O.S9
$10,000 to $12,499 12,1 S3 O.S3
512,500 to $14,999 9? 16 0.99
$15,000 to 517,499 12,792 1.00
$17,500 to $19,999 11,091 1.OS
$20,000 to $22,499 12,366 1.1 S
$22 500 to $24,999 10 308 1.30
25, to 27,499 11,037 1.37
.~ to _
$30,000 to $32,499 10,557 1.52
$32,500 to $34,999 7,401 1.b3
$35,000 to $37.499 8,307 1.67
$37,500 to $39,999 6,891 1.68
$40,000 to 542,499 7,368 1.69
$42,500 to 544,999 5,649 1.87
$45,000 to 547,499 6,417 1.89
$47.500 to 549.999 S 007 1.S9
50,000 to 554,999 8,790 1.97
~, to ~ ~ ~
$60,000 to 574,999 17,334 2.06
$75,000 to S99.999 12,156 2.32
$100,000 to 5124,999 4,746 2.30
$125,000 to J 149.999 1,995 2.30
$ ! 50,000 or more 3,672 2.35
Total 235,425 1.43
Median Income (1990) $37,191
3U% iVledian Income (1990 Estimated) $11,157
Source: 1990 Census of Populatiwc mid Housing, Public Use Mic•rodata Sample (PUNTS), prepuret! by the
Puget Sound Regional Coeurcil, Jctnuarv 300/
Important Notes:
1. Census data reports average vehicles available by household income. Actual vehicle
ownership rates -- which may be considerably lower -- are not reported.
2. Census data does not distinguish between households living in single-family
neighborhoods and those living in multifamily housing arrangements. Consequently,
the actual number ol~ vehicles available to multifamily households only is not
available. This is an important distinction because the City regulates required parkin
for these two uses differently.
^ T h e Shea Group 360-459.3609.360-459-0154 fax
a Paramefrix company 8830 Talton Lane, Suite B, Lacey, WA 98516 • PO Bax 3427, Lacey WA 98509-3427
MEMORANDUM
Date: October 23, 2001
To: Cathie Carlson, Community Development Director ACT 2 ~ 2001
City of Yelm ~a~,r
From: George Smith
Subject: Mountain View Apartment TModel Trip Distribution
cc:
Project Number: 244-1781-015 (08)
Project Name: Mountain View Apartment
As you requested, we are providing trip distribution percentages for the proposed Mountain
View Apartment project.
The vehicle directional trip distribution to and from the site will be based primarily on:
• The area street system characteristics;
• current travel patterns on the area roadways,
• the proposed access system for the project, and
• locations of residential areas and shopping/commercial centers.
The directional distribution of traffic to and from the proposed multifamily development was
estimated using the regional transportation model. The Thurston Regional Planning Council
(TRPC) created the area-wide transportation model with cooperation from local jurisdictions
within the County. The model, developed using the TModel2 software package, has been
calibrated to accurately represent the existing vehicle travel patterns throughout the entire
county.
In the transportation model, the county-wide transportation network is divided into 483 "Traffic
Analysis Zones" (TAZs). The Mountain View multifamily development is located within TAZ
388. A distribution analysis was performed for this project by conducting a "Select Zone
Analysis" for TAZ 388. This feature of the TModel2 software package allows all of the traffic into
and out of a particular zone to be isolated and shown separately from the rest of the traffic on
the network. This graphically shows the percentage of vehicles currently using each of the
available routes into and out of the area. From this information, we calculated distribution
percentages for future traffic from the proposed Mountain View multifamily development. Of the
new project trips, approximately 62% will use Yelm Avenue to/from the east to access the site.
The remaining 38% will use Yelm Avenue to/from the west. A copy of the TModel plot is
provided as an attachment.
k:11781\015\08\Mountain View Apt trip distribution.doc
Quality Service Through Employee Ownership X01
CITY OF YELIVI
COMIYICJMTY DEVELOPMENT DEPARTNIEN'~~
PU BOX 479 -105 YEL1~I AVM; W
XELM WA 98597
{360) 458-3$35
FAX: (360) 458-3144
TO: Kevin
<'
FAX #: 42S-82S-8434
FROM: Cathie Carlson
Commpnit~' De'velopmeeit Director
SUBJECT:
CO1V1M-EN'Y'S:
DATE: OCTOBEYt 30, 2001
PAC + S: 2 including this cover sheet.
'~ ~' jF YOU DO NOT It)ECEIV)E A)t.)<. COI'I)ES, OR AN`Y' COP'Y' IS NOT I.EGISLE, PLEASE CALL
(360} 45$-3835 AS SOON AS POSS~LE.
C:1'QVTIVbOWSlbeslctoplfau oover.doc
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~~ TI#I?
~~
4
•IMf wAM11N07'ON
FAX T~tANSMISSION
CITY OF YELM
COMMUNITY DEVELOPMENT DEPARTMENT
PO BOX 479 -105 YELM AVE W
YELM WA 98597
(360) 458-3835
FAX: (360) 458-3144
TO: Kevin
FAX #: 425-825-8434
FROM: Cathie Carlson
Community Development Director
SUBJECT:
COMMENTS:
DATE: OCTOBER 30, 2001
PAGES: 2 including this cover sheet.
* * IF YOU DO NOT RECEIVE ALL COPIES, OR ANY COPY IS NOT LEGIBLE, PLEASE CALL
(360) 458-3835 AS SOON AS POSSIBLE.
C:\WINDOWS\Desktoplfax cover.doc