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Transportation Engineering NorthWest
Transportation Planning | Design | Traffic Impact & Operations
11400 SE 8th Street, Suite 200, Bellevue, WA 98004 | Office (425) 889-6747
MEMORANDUM
DATE: September 6, 2019
TO: Rich Snyder
Sound Ford
FROM: Jeff Schramm / Curtis Chin, P.E.
TENW
SUBJECT: Transportation Impact Fee Estimate for the proposed
Sound Ford Collision Center – Renton, WA
TENW Project #5963
This memorandum documents the independent transportation impact fee estimate for the proposed Sound
Ford Collision Center project in Renton, WA. An independent transportation impact fee is allowed by the
Renton Municipal Code (RMC) 4-1-190 (H).
Project Description
The proposed Sound Ford Collision Center would be located at 715 Lind Avenue SW as shown in the
Attachment A vicinity map. The proposed project would convert 18,000 square feet (SF) within an existing
warehouse building into a collision center with 21 service bays. Sound Ford currently operates a 10,000
SF collision center with 12 service bays located at 750 Rainier Ave S.
Independent Transportation Impact Fee Estimate
Sound Ford Collision Center
TENW September 6, 2019
Page 2
Background
The independent traffic impact fee calculation for the proposed Sound Ford Collision Center is based on the
following: (1) use of the trip rate for warehouse (LUC 150) included in the current ITE Trip Generation Manual,
10th edition; and (2) use of local trip generation data collected at the existing Sound Ford collision center.
Existing Use Transportation Impact Fee Credit
Consistent with City of Renton methodology used to assess transportation impact fee credit for warehouse
uses, the transportation impact fee credit was calculated by factoring the CityÊs transportation impact fee rate
per SF for Mini-Warehouse by the ratio of the ITE weekday PM peak hour trip rate for Warehouse to the
weekday PM peak hour trip rate for Mini-Warehouse. Table 1 summarizes the resulting impact fee per SF
for Warehouse.
Table 1
Transportation Impact Fee Per SF for Warehouse
A B C D = A X B / C
Impact Fee for
Mini Warehouse
($/SF)1
Weekday PM Peak
Hour Trip Rate for
Warehouse 2
Weekday PM Peak
Hour Trip Rate for Mini
Warehouse 2
Corrected Impact
Fee for Warehouse
($/SF)
$1.86 0.19 0.17 $2.08
1. Per City of Renton 2019-2020 Transportation Impact Fee Schedule.
2. Per Institute of Transportation Engineers (ITE) Trip Generation Manual, 10th Edition.
The following Table 2 summarizes the resulting transportation impact fee credit for the existing 18,000 SF
warehouse space based on the derived rate of $2.08 per SF.
Table 2
Existing Transportation Impact Fee Credit
A B C = A X B
Impact Fee for
Warehouse ($/SF)
Existing Use
Building Area
Existing Use
Impact Fee Credit
$2.08 18,000 SF $37,440
As shown in the table above, the transportation impact fee credit for the existing Warehouse space is
$37,440.
Sound Ford Collision Center Trip Rate
To estimate the weekday PM peak hour trip generation rate for the new Sound Ford Collision Center, traffic
counts were collected at the existing 12 service bay Sound Ford Collision Center at 750 Rainer Ave S. Three
days of traffic counts were collected from Tuesday August 27th, 2019 through Thursday August 29th, 2019
between 4:00 and 6:00 p.m. to determine an average number of vehicle trips during the PM peak period.
Based on the data collected, an average of 5 vehicle trips occurred during the PM peak hour.
Independent Transportation Impact Fee Estimate
Sound Ford Collision Center
TENW September 6, 2019
Page 3
A summary of the traffic counts is provided in Attachment B. The resulting trip rate per service bay associated
with the Sound Ford Collision Center is shown in Table 3.
Table 3
Sound Ford Collision Center Trip Rate Calculation
A B C = A / B
3-day Average PM
Peak Hour Traffic
Count
Existing Collison
Center Service
Bays
PM Peak Hour Trip
Rate per Service Bay
5 trips 12 Service Bays 0.42
As shown in Table 3, the traffic counts collected result in a weekday PM peak hour trip rate of 0.42 trips per
service bay.
Proposed Use Independent Transportation Impact Fee Calculation
The independent transportation impact fee calculation for the proposed new Sound Ford Collision Center
was determined based on derived transportation impact fee rate per service bay based on the following:
· Derived PM peak hour trip generation rate = 0.42 trips per service bay
· Average Vehicle Occupancy (AVO) = 1.353*
· Percent New Trips = 100%
· 2019 cost per PM peak hour person trip ($5,145.01 per person trip)
As a result, an impact fee rate of $2,923.70 per service bay was determined (see Table 4 below).
*It should be noted the AVO used in the calculation is consistent with AVO included in the City of RentonÊs
Rate Study for Impact Fees for Transportation.
Table 4
Sound Ford Collision Center Transportation Impact Fee Rate
A B C D E = A X B X C X D
Trip Rate
(PM Trips/service bay) AVO1
Percent
New Trips
Cost Per PM
Person Trip (2019) Impact Fee Rate
0.42 1.353 100% $5,145.01 $2,923.70 per
service bay
1 Per City of Renton Rate Study for Impact Fees for Transportation, dated July 5, 2016.
Independent Transportation Impact Fee Estimate
Sound Ford Collision Center
TENW September 6, 2019
Page 4
Table 5 summarizes the resulting independent transportation impact fee.
Table 5
Proposed Use Transportation Impact Fee
A B C = A X B
Impact Fee for Vehicle
Service Facility
($/service bay)
Proposed
Number of
Service Bay
Proposed
Independent
Transportation
Impact Fee
$2,923.70 21 $61,397.70
As shown in Table 5, the proposed independent transportation impact fee for the proposed new Sound Ford
Collision Center is $61,397.70; note that this calculation does not include credit for the existing warehouse,
which is addressed in the next section.
Resulting Independent Net Transportation Impact Fee
The resulting net transportation impact fee is calculated by applying the existing transportation impact fee
credit toward the independent transportation impact fee for the proposed Sound Ford Collision Center. As
shown in Table 6, the resulting net transportation impact fee is $23,957.70 ($61,397.70 – $37,440).
Table 6
Net Transportation Impact Fee
A B C = A - B
Proposed Use
(Collision Center)
Less Existing Use
(Warehouse)
Net Transportation
Impact Fee
$61,397.70 $37,440 $23,957.70
If you have any questions regarding the information presented in this memo, please contact Jeff Schramm at
(425) 250-0581 or schramm@tenw.com.
Attachments:
A. Project Vicinity Map
B. Sound Ford Collision Center Existing Counts
Independent Transportation Impact Fee Estimate
Sound Ford Collision Center
ATTACHMENT A
Vicinity Map
Independent Transportation Impact Fee Estimate
Sound Ford Collision Center
ATTACHMENT B
Sound Ford Collision Center Existing PM Peak Hour Counts
Tuesday 8/27/19 – Thursday 8/29/19
Sound Ford Collision Center
750 Rainier Ave S, Renton, WA 98057
Existing Trip Generation Summary - Weekday PM Peak
Tuesday, 8/27/19
Interval
Begin In Out Total
4:00 PM 0 0 0
4:15 PM 1 1 2
4:30 PM 0 0 0
4:45 PM 0 2 2 4 4:00 pm - 5:00 pm
5:00 PM 0 0 0 4 4:15 pm - 5:15 pm
5:15 PM 0 0 0 2 4:30 pm - 5:30 pm
5:30 PM 1 2 3 5 4:45 pm - 5:45 pm
5:45 PM 0 2 2 5 5:00 pm - 6:00 pm
1 4 5 Peak Hour is 4:45 pm - 5:45 pm
Wednesday, 8/28/19
Interval
Begin In Out Total
4:00 PM 0 0 0
4:15 PM 1 1 2
4:30 PM 0 0 0
4:45 PM 0 0 0 2 4:00 pm - 5:00 pm
5:00 PM 0 0 0 2 4:15 pm - 5:15 pm
5:15 PM 0 0 0 0 4:30 pm - 5:30 pm
5:30 PM 0 0 0 0 4:45 pm - 5:45 pm
5:45 PM 0 2 2 2 5:00 pm - 6:00 pm
1 1 2 Peak Hour is 4:00 pm - 5:00 pm
Thursday, 8/29/19
Interval
Begin In Out Total
4:00 PM 1 1 2
4:15 PM 0 1 1
4:30 PM 0 0 0
4:45 PM 0 0 0 3 4:00 pm - 5:00 pm
5:00 PM 1 0 1 2 4:15 pm - 5:15 pm
5:15 PM 1 0 1 2 4:30 pm - 5:30 pm
5:30 PM 2 3 5 7 4:45 pm - 5:45 pm
5:45 PM 0 0 0 7 5:00 pm - 6:00 pm
4 3 7 Peak Hour is 4:45 pm - 5:45 pmPeak Hour 7
Total Trips
Hourly Totals
Hourly Totals
Peak Hour
5
Total Trips
Hourly Totals
Peak Hour
2
Total Trips
9/5/2019