Trip Generation Report 001Tr spor'ceuan
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February 16, 2006
Mr. Jeff Kennedy
Twin County Credit Union
PO Box 718
Olympia, WA 98507-0718
Re: Twin County Credit Union Expansion
Trip Generation/Impact Fee Report
Dear Mr. Kennedy:
We are pleased to present this trip generation/impact fee report for the proposed
2,585 SF expansion of the Twin County Credit Union. The project site is located at
1105 W. Yelm Avenue (SR 510) in the City of Yelm, WA. The scope of this study is
based on the City of Yelm Municipal Code Chapter 15.40, Concurrency Management,
and the Pre-Application Meeting comments, dated May 4, 2005, provided by the City of
Yelm Community Development Department.
PROJECT DESCRIPTION
This project proposes to expand the existing Twin County Credit Union building
by 2,585 SF. It will also increase the number ofdrive-in teller lanes from two to four
lanes. There will be a maximum of 15 employees at the site after the project is
completed. Jerone W. Morrissette & Associates Inc. told us that they used 15
employees maximum for the sewer calculations. Site access is from W. Yelm Avenue
and will remain unchanged.
EXISTING CONDITIONS
The Twin County Credit Union building currently has 3,342 SF and two drive-in
teller lanes. Access to the site is from W. Yelm Avenue, which has two driveways.
Based on conversations with Mr. Jeff Kennedy, there are currently ten employees at the
sRe during the PM peak hour.
TRIP GENERATION
The trip generation estimates are calculated using the data in the Institute of
Transportation Engineers (ITE) Trip Generation, Seventh Edition, 2003. The Twin
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Mr. Jeff Kennedy
Twin County Credit Union
2/16/2006
Page 2
County Credit Union is a Drive-in Bank, which is land use code 912. Banks in this
category may also serve patrons who walk into the building. Trip generation rates for
Drive-in Banks are given for three independent variables: employees, 1000 SF gross
floor area, and drive-in lanes. This data is a weighted average from studies which have
been conducted from the mid-1970s to the 2000s throughout the United States.
The Twin County Credit Union project will increase the square footage of the
building from 3,342 SF to 5,927 SF, which is a 77% increase. The number of
employees will increase from 10 to 15, which is a 50% increase. The drive-in lanes will
increase from two to four, including an ATM lane, which is a 100% increase. The size
of the site remains constant but there will be a reduction in parking spaces from 41 to
36, or 12%.
In recent years banking options have changed. Both ATMs and Internet banking
have changed the nature of in person transactions at banks. ATMs at the site generate
trips 24 hours a day instead of just during the traditional hours that the bank is open.
This is true for both walk-in and drive-in ATMs. Thus, many trips which used to happen
during the PM peak hour before the bank or credit union closed can now be made at
any time. Since many quick transactions (deposits, cash withdrawals) can now be done
at the customer's convenience without regard to whether or not the bank is open, it is
expected that a higher percentage of transactions occurring while the bank is open
would now be lengthier transactions, such as loan applications.
The ITE Trip Generation Handbook states that when a choice of independent
variables is available, the preferred independent variable is one that appears to be a
"cause' for the variation in trip ends generated by the land use. The Twin County Credit
Union project is an expansion to an existing building. This project includes providing
larger offices and more work space for existing employees, so square footage may not
be the best choice of independent variable in this case. The increase in employees will
allow the credit union to serve more customers, who generate trips to and from the site.
The increase in drive-in lanes will increase the queue space available for customers,
but how fast they move through the queue and off the site is dependent on the
employees serving the drive-in lanes, except for ATMs. Trip Generation does not
include any data relating specifically to ATMs, except to state that drive-in lanes with
ATMs are included in the count for number of drive-in lanes. Based on currently
available data, we recommend using number of employees as the independent variable
to calculate trip generation for this project.
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Mr. Jeff Kennedy
Twin County Credit Union
2/16/2006
Page 3
Table 1 shows the estimated vehicle trip generation for the proposed Twin
County Credit Union building during the street traffic PM peak hour based on number of
employees. A vehicle trip is defined as a single or one direction vehicle movement with
either the origin or destination (exiting or entering) inside the study site. The trip
generation values shown in Table 1 account for all site trips made by all vehicles for all
purposes, including employees, customers, and delivery vehicle trips.
Table 1: PM Peak Hour Trio Generation
Employees Trips per
employee Total Trips
Current 10 8.65 87
Future 15 8.65 130
Increase 5 8.65 43
As shown in Table 1, approximately 43 net new PM peak hour vehicle trips are
expected to be generated by the proposed Twin County Credit Union project on an
average weekday.
Access to Twin County Credit Union is directly off SR 510, also known as W.
Yelm Avenue in the area of this project. This portion of SR 510 is classifed as a minor
arterial by WSDOT. Average daily traffic in 2004 was approximately 15,000 vehicles.
Trio Generation Handbook defines apass-by trip as an intermediary stop on the way
from an origin to a primary trip destination without a route diversion. For Land Use 912,
Drive-in Bank, the average pass-by trip percentage is 47. The total trips are reduced by
the number of pass-by trips to determine the number of new trips generated by this
project. This is shown in Table 2.
Table 2: PM Peak Hour New Trips
Total Trips Per Cent
pass-by Number
Pass-by
New Trips
Current 87 47% 41 46
Future 130 47% 61 gg
Increase 43 47% 20 23
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Mr. Jeff Kennedy
Twin County Credit Union
2/16/2006
Page 4
TRANSPORTATION FACILITY CHARGE
Chapter 15.40, Concurrency Management, of the Yelm Municipal Code requires
that development projects pay a Transportation Facility Charge (TFC) in order to
mitigate system-wide traffic impacts to City streets. The City has adopted a TFC of
$750.00 per PM peak hour trip. Using this rate and the 23 new PM peak hour trips from
Table 1, the TFC is $750.00 x 23 = $17,250.00.
CONCLUSIONS AND RECOMMENDATIONS
The Twin County Credit Union project should agree to pay the Citys
Transportation Facility Charge for the new trips generated by the project based on the
increase in number of employees. Using the City's TFC rate of $750.00 per PM peak
hour trip, the Twin County Credit Union project is calculated to have a TFC of
$17,250.00.
Please contact me if you have any questions.
truly yours,
VHB:JTH
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MIRAI TRANSPORTATION
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Victor H. Bishop, P.E.
Pdncipal Traffic Engineer
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