20110166 Trip Generator Data 03212011.. ...
.~ ...
~- .-
t
SHEA - CARR - ,JEWELL.
i rd<,rnn r~rinu:nnn~r~i n~rnmv<. •.~ r~~n. i •.
MEMORANDUM
TO: Marijke Deut Cher
FROM: Perry Shea/, Pf 'f'rincipa) l~~
F:rie Johnston, ~TYansportation PI nninf; Manal;er
DATE: March 2'l, 201 1
PROJECT #; SCJ 0"190.03
SUBIECT: Yelrn Children's Center Trip Generation Study
OVERVIEW
This memorandum documents the trip generation study completed on behalf cif the Velm Children's
Center project in Yelm, Washington. The City of Yelm utilizes trip generation rates developed by the
Institute of Transportation Engineers (ITE) to determine off~site traffic impacts resulting from
development within the City's jurisdiction. The City also has a Traffic Facility Charge (TFC) program to
address system-wide transportation improvements, and the schedule of Fees is also based on the ITF
data.
However, preliminary evaluation of three similar, local day care centers indicate that the ITE rates are
substantially higher than those experienced locally at these centers. Following the City's provision to
allow an independent fee calculation consistent with ITE methodology, this study was undertaken to
collect actual vehicle trip data from each of three similar day care centers and calculate an appropriate
trip generation rate. In addition, the Yelm Children's Center as proposed will follow a new operational
program. This program is summarized in this memorandurr~, and appropriate trip generation rates are
identified.
TRIP GENERATION DATA COLLECTION
Traffic and other quantitative data were collected consistent with ITE methodology, including the
following criteria:
Location. Sites were selected in Western Washington to provide more specific, local data.
Collection Period. Because the PM peak hour typically represents the highest congestion level, and
therefore period of greatest impact, traffic impact studies and traffic fee collection programs use the
PM peak hour of adjacent street traffic as the critical period of analysis. Based on this criterion,
traffic count data was collected from 4pm to 6pm to capture the PM peak hour. The peak traffic
hour for the daycare centers also typically falls in this period.
School Schedule. Data collection was scheduled for periods when local schools and businesses were
operating normally. Counts were therefore scheduled to avoid severe weather, holidays, or other
known atypical traffic days. All counts were performed during the mid-week period.
2.102H Carriage Drive SUl 4 Olympia, W~ 98502 ~ Office 360.352.1.n65 ~ r ax 360 3'>7 1 509 ~ www.SheaCarrlewell.corn
~ .i~•
~i~
Marijke Deutscher
March 23, 2011
Page 2 of 7
Data Set. Data was collected at three separate locations, and over three days at each location. This
allows the data to be averaged to minimize the effect of uncontrolled incidental events that might
otherwise compromise the data.
Using this criteria, Shea Carr Jewell (SCJ) staff applied the data collection methodology to the following
three daycare centers. Below is a breakdown of the primary site characteristics and functional
parameters of each study location:
Site #1: Mini-Skool Early Learning Center
Location: 4110 6th Ave NE, Lacey, WA
Size: 8,500 square feet
Site #2: Mini-Skool Early Learning Center
Location: 8911 Martin Way E, Lacey, WA
Size: 8,500 square feet
Site #3: Mini-Skool Early Learning Center
Location: 3910 Yelm Hwy SE, Olympia, WA
Size: 8,500 square feet
An aerial depiction of each site is attached to this study for reference purposes.
Table 1 provides a summary of the PM peak hour vehicle trips counted at the three sites identified
above.
Table 1. Data Collection Summary
Site Vehicle Trips
Time
Interval
End
4:15
4:30
4:45
5:00
5:15
5:30
5:45
6:00
Total
P k H r Tota I
Tuesday, March Ol, 2011
Out Total
5 8
3 10
8 12
9 17
9 19
6 16
14 23
8 13
62 118
38 75
In
3
7
4
8
10
10
9
5
56
37
Wednesday, March 02, 2011
In Out Total
2 6 8
7 4 11
6 8 14
6 8 14
10 5 15
14 11 26
9 15 24
3 10 13
57 67 124
39 39 78
Thursday, March 03, 2011
In Out Total
3 2 6
6 6 12
5 6 11
6 8 14
8 6 14
9 it 20
y y 18
10 15 25
56 63 119
36 41 77
Site Average: IN 37.33 OUT 39.33 TOTAL 76.67
,~,, - ,~ -
~1-+11-
Marijke Deutscher
March 23, 2011
Page 3 of 7
Time
Interval
End
4:15
4:30
4:45
5:00
5:15
5:30
5:45
6:00
Total
Pk Hr Total
Tuesday, February 15, 2011
In Out Total
4 4 8
9 3 12
6 7 13
8 7 15
6 y 15
8 7 15
9 9 18
2 4 6
52 50 102
31 32 63
Wednesday, February 16, 2011
In Out Total
2 5 7
6 6 12
8 5 13
6 7 13
8 4 12
13 10 23
11 li 22
4 9 13
58 57 115
38 32 70
Thursday, February 17, 2011
In Out Total
6 5 11
10 7 17
7 8 15
9 10 19
5 6 it
9 5 14
6 8 14
3 6 9
55 55 110
31 31 62
Site Average: IN 33.33 OUT 31.67 TOTAL 65.00
Site 3: 2910 Yelm Hwy SE, Olympia, WA
Time
Interval Tuesday, February 15, 2011 Wednesday, February 16, 2011 Thursday, February 17, 2011
End In Out Total In Out Total In Out Total
4:15 1 2 3 5 5 10 7 9 16
4:30 7 4 11 1 3 4 4 2 6
4:45 SO 9 19 8 4 12 10 5 15
5:00 S 8 13 4 5 9 5 5 10
5:15 S S 10 7 4 it 6 7 13
5:30 16 11 27 17 16 33 9 8 17
5:45 7 10 17 7 10 17 15 12 27
6:00 3 7 10 g 7 16 3 8 11
Total 54 56 110 58 54 112 59 56 115
Pk Hr Total 36 33 69 40 37 77 33 35 68
Site Average: IN 36.33 OUT 35.00 TOTAL 71.33
CHILD CARE CENTER PROGRAM
The Yelm Children's Center will operate according to a new corporate model that provides both
traditional child care services as well as school-related services. The standard child care program will
serve infants through children 5 years of age. The school services program will offer before and after
school care, preschool, pre-kindergarten and kindergarten. A preliminary floor plan showing the space
layout and program elements is attached to this memorandum.
Table 2 below summarizes the program schedules and number of participants in each program.
-~ `~'-
"~~
Table 2. Program Schedules and Participants
Marijke Deutscher
March 23, 2011
Page 4 of 7
Program Hours Number of Children
Standard Children's All Day 50 children.
Before & After School 10 children in the morning and 10
Care Before and after school hours children in the afternoon.
Morning Class 9-11:30am 15 children per class.
Preschool
Afternoon Class 12:30-3pm 15 children per class.
Pre-Kindergarten 9:00 am - 3:00 pm 15 children per class.
Kindergarten 9:00 am - 3:00 pm 15 children per class.
A trip generation rate was developed for the proposed children's center based on the data summarized
previously in Table 1 and the school services program outlined in Table 2. This process is detailed in the
following section. Morning program participants were assumed to have no impact in the PM peak hour
as related to this facility. Evening peak hour traffic generation did, however, take into account all the
afternoon classes, as the class end time is similar to typical school departure times.
TRIP GENERATION RATE
Trip generation rates for the two parts of the program (child care services and school services) included
in the Yelm Children's Center project are discussed below.
Children's Services Program
A trip generation rate was developed based on the trip data summarized in Table 1 and on the size of
the day care centers in the study. Each of these sites was developed based on a similar program, so
each building is 8,500 square feet in size. Table 3 below summarizes the trip generation data and
associated rate for each site, as well as the average of the three sites. ITE trip rate is included for
comparison.
The data in Table 3 clearly indicate that the local day care center sites generate fewer trips than
indicated by the ITE rate. The three study sites average 8.35 total trips per 1,000 square feet (sf) of floor
area in the PM peak hour, compared to the ITE rate of 12.46 trips/1,000 sf.
.~ ..
f .~-
~~
Table 3. Children's PM Peak Hour Trip Generation Rates
Marijke Deutscher
March 23, 2011
Page 5 of 7
ITE Total Trips
Data Source LU ITE Description Variable Units In Out Total Rate
Site #1 565 Day Care Center ksgft 8.500 37 39 77 9.02
Site #2 565 Day Care Center ksgft 8.500 33 32 65 7.65
Site #3 565 Day Care Center ksgft 8.500 36 35 71 8.39
Day Care Site Average 565 Day Care Center ksgft 8.500 36 35 71 8.35
ITE -Peak/Adjacent Street' 565 Day Care Center ksgft 8.500 50 56 106 12.46
11TE trip rates are taken from ITE's Trip Generation, 8`h Edition.
School Services Program
Trip generation data for existing school services programs similar in nature to that proposed with this
project are not readily available. The child care centers evaluated in the previous section of this study
did not have similar programs in place. The best source of trip generation data is ITE's Trip Generation,
which provides the trip generation rates listed in Table 4 below. These rates are based on either 1,000
square feet of floor area or the number of students. For the site plan provided for the Yelm Children's
Center (attached), 4,103 square feet are identified for child care spaces, 4,647 square feet are identified
for school services, and 946 square feet are support or administrative areas. The calculations
summarized in Table 4 assume half the admin/support spaces are allocated to school services and only
the afternoon school programs are used for student counts.
Table 4. School Services PM Peak Hour Trip Generation Rates
ITE Total Trips #
LU ITE Description Variable Units Rate In Out Total Studies
520 Elementary School - PM Peak students 55 0.15 4 5 8 20
Hour of Adjacent Street Traffic
520 Elementary School - PM Peak ksgft 5.120 1.21 3 3 6 10
Hour of Adjacent Street Traffic
11TE trip rates are taken from ITE's Trip Generation, 8`h Edition.
The data in Table 4 represent the only available ITE rates for the PM peak hour of adjacent street traffic,
which is the period analyzed in Traffic Impact Analyses (TIAs) and used in the City of Yelm's TFC
program. Therefore, LU 520 as characterized by ITE represents the best available data for trip
generation calculations for the school services portion of the Yelm Children's Center project. For the
purposes of this evaluation, the square footage rate will be used for consistency with the other (child
care) use, with the resulting rate of 1.21 PM peak hour trips per 1,000 square feet of floor area.
NON-PRIMARY TRIPS
Off-site impacts from project-generated trips must also take into account factors that reduce the new-
to-network trips. Most jurisdictions have in place a methodology to account for Pass-ey trips (trips
drawn to the project from the immediately adjacent road) and/or Diverted-Linked trips (trips attracted
from nearby roads). Some of these rates are based on ITE data, but ITE does not have rates for many
land uses, including LU 565 "Day Care Center." The City of Yelm allows a default value of 25% to account
for non-primary trips for a day care land use.
~ Marijke Deutscher
March 23, 2011
Page 6 of 7
ITE regularly publishes technical papers on a variety of transportation topics, but the only available
resource on pass-by trip rates for day care centers was published in ITE's 1990 Compendium of Technical
Papers. In "Trip Generation of Day Care Centers," Preston W. Hitchens, Jr. summarizes data collected at
six day care centers. The study included a survey of parents picking up their children, and from this data
Hitchens developed the following break-down of trip types:
• 24% Primary Trips
• 44% Pass-By Trips
• 32%Diverted-Linked Trips
With 76% of the trips as non-primary, this study is consistent with the criteria in developing a day care
center site that dictates easy access and visibility on major commuter routes. However, while this is not
very recent data and is not specific to the South Puget Sound region, it does suggest the City of Yelm's
default pass-by rate is appropriately conservative and should be applied to the child care portion of this
project.
TRIP GENERATION CALCULATION
Table 5 presents the trip generation calculation for the Yelm Children's Center project. This calculation
takes into account the data collected at the three South Puget Sound day care centers, as well as the trip
generation identified for the school services portion of the project. The City of Yelm's default 25% non-
primarytrip factor is applied to the child care portion of the project only. Based on the findings of this
study, the project will generate 35 new PM peak hour trips.
Table 5. Yelm Children's Center PM Peak Hour Trip Generation
Totat Trips Non- Net PM
ITE LU
ITE Description
Variable
Units
Rate
In
Out
Total Primary
9'o Peak Hr
Trips
565 Day Care Center ksgft 4.576 8.35 19 19 38 25 29
520 Elementary School - PM Peak
Hour of Adjacent Street Traffic ksgft 5.120 1.21 3 3 6 0 6
9.696 22 22 44 35
ITE trip rates are taken from ITE's Trip Generation, 8`h Edition.
CONCLUSION
This study has shown that the three day care study sites are significantly and consistently below the ITE
trip generation rate. A trip generation rate of 8.35 trips per 1,000 square feet of floor area is shown to
bean appropriate measure for the child care portion of the facility.
For the school services portion of the project, the best available data for trip generation is contained in
ITE's Trip Generation for LU 520 Elementary School-PM Peak Hour of Adjacent Street Traffic. A trip
generation rate of 1.21 trips per 1,000 square feet of floor area is shown to bean appropriate measure
for the school services portion of the facility.
Non-primary trips have also been shown to be a significant factor, and must be accounted for in the trip
generation calculation. A reduction of 25% for non-primary trips would maintain an appropriately
conservative trip estimate for calculation of TFC fees.
i- .~. "
~~
M~uijke I)i~utscht~i
Marcar I ~, 1U1
I'a(;~~ / of /
If tf~e information f~rovided in this mer»oranrltnn is al~i~h~~tl to the I~rt>fx~s~~ri Y~~hrr l;triklrrn'ti t:<<ntrr, th~~
City may calculate the Traffic Facility Charge as follows:
35 Nr~( PM I'enk 1 four 1 ri/~s
x $:1,321 %FC /'rr 1'M I'ecrk 1lnur ~l~ri~~
$46,23`i
Please let us know if you have any questions or need clarification on the inforrnatinn Irres~~ntt+ti within
this mernorandurn. -Thank you.
N:AProjects\290 OeuCscfier\0290.03 Yelm Day Care-Trip Generation Study\Phasc Ot rrip C,encration Study\r2eport\TM ZOL L 0 i11 1Yip Gen
Study (Yelm).docx
~? ~~~
,.
..,- .~~
c~
:~a.. ~~
;•~:,
~ rta
,g~ , _~+" a ~ K
~ _: P e
~~
Z #
f~
a !Q ~!
i ~~
i ~ ~+
,edt'
a ~ ,~i
F
"~
~ ~~ , ~ € fi s ate'
r-~ e
~~
~
~
~' t
. , t ta T- "
Ers
. ~ d;
,
~. °Y
~ ~i .
, _
~ ~ ~ ~
t.~
~~ i~,kE ~~~;~
a
~ ~ 3
'y~R~.n - _
C xax ~
h s.4- ~.~
5
~. ~~ ~:~
c~
~~`
~ ~ ~ r ~ ~ ~ ~
1~ & :.
C.. ~ - 4 ~ ,
s- ~ } ~.
.,t~ r fy
£ ~ rrx9
R: ~ ~~
-~.-
~~ ,~ ~~~
!! ` t~~
+,~i
.i 3 \ €'
as
FF r'
• 4 $ :!f
t;
s~'~t,
^tT
^4~ ~
o- ' ~~ ~
:~
,fit dig '~
}_ ..a'te' ',; .. °.
v Q ~-
~, ~ ~
c 3
U ~ N
~ ~
f0 ~
V
.6 v
c
s °1
U ~
GJ ~
L
61
`3
v
v
u
i J
f0
*k J W
~" a
N (Lp Q
W
L
O ~
Y
H O
e-I
~..~
C ~
_ -...
~~''
`'
;;~~
c ~
U ~ N
i ~ ~
~ '++
v
~_ ~
c
t a
U ~
~ ~
v ~
Y
~-p!r
~~ 'P~ ` P
~'~ t .
~., ~ F '3 s~.` yc
~# _.
f
~° ,~
-~ ~„ t `
- ~~•
~ ~'
L
=3
v
v >:
no ~+
c ~
~= J
N t6 W
Y't J ~
~ T
H ~ C
W
O tCC~o
Y G
H i..~
C ~
~3
...7
W
W
1,,~~ ~
+~~ ~
U
Q
W
I
T re ~
{ R
~ > ~
U ~ N
C
L ~' ~
~ L
V
t ~
U ~
~ ~:
r',
,~ .__
~~5,
f
~;
f ~",
~~~ ~.
~~}~~
~ t~.~
Q
W
I
~ ' ~ ..~
a~ -,
C
'n ; ,
~;.3;
,. ~„
:;: _.
;,
~~„~>. : : W,..., :.,...,.~, Wax ~~, _,,,:,,::::,. ; ~,~~~,i
U ~_i_ in
c
Ql .~U 0
~ c5
u
.~ u
c
~'
V t~
E °'
r
c
ro
u.
b
n
r~
.~
.~
p.
.~.~
~4~I
~~, i
~_.~~! ..
{'-
` Y ~y,.
~` 1-:.
~ t;
~..r
:!,
l~
:~:
~~
TRANSMITTAL
We look forward to meeting you to discuss the project. Please feel free to call me if you have any
questions.
l„ ~t Jean Carr, LEED AP
Principal
Shea Carr Jewell
N:\Projects\290 Deutscher\290.05 Yelm Day Care Site\Phase 01-Site Plan Review Application\T.2011-0301 SPR transmittal.docx