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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:December 8, 2020
TO:Justin Johnson, P.E.
City of Renton
FROM:Curtis Chin, P.E.
TENW
SUBJECT:Updated Trip Generation Memo
Renton Walmart Pickup Expansion – Renton, WA
TENW Project No. 2020-263
This memorandum documents the trip generation estimate for the proposed expansion of the existing Walmart
Supercenter located at 743 Rainier Avenue S in Renton, WA. This is an update to our previous trip generation
memo dated May 23, 2019 to reflect the current proposed site plan which includes a larger expansion area.
Project Description
The existing Walmart is located at 743 Rainier Avenue S in Renton, WA as shown in the Attachment A
vicinity map. The proposed project would expand the existing 150,158 square foot (SF) Walmart with
4,547 SF of new building area on the north side of the building. The purpose of the proposed expansion is
to support Walmart’s Online Grocery Pickup (OGP) program. Vehicular access to/from the project would
be provided via the existing site driveways located on SW 7th Street, Rainier Avenue S, and SW Grady
Way. No new site driveways are proposed as part of the proposed project. A preliminary site plan concept
is shown in Attachment B.
Updated Trip Generation Memo
Renton Walmart Expansion
TENW December 8, 2020
Page 2
Trip Generation
Because the proposed expansion is to support Walmart’s OGP program, which is provided as a convenience
to existing customers, the overall trip generation for the Renton Walmart is not expected to change due to the
expansion. However, as a conservative approach, new trips associated with the 4,547 SF expansion were
estimated using methodology included in the Institute of Transportation Engineers (ITE) Trip Generation
Manual, 10th Edition for Land Use Code (LUC) 813 (Free-Standing Discount Superstore). Adjustments to the
trip generation estimates were made to account for pass-by trips which are made by vehicles that are already
on adjacent streets and make intermediate stops at the site en-route to a primary destination (e.g. on the way
home from work). The resulting net new weekday daily, AM, and PM peak hour trips associated with the
proposed expansion are summarized in Table 1. Detailed trip generation calculations are included in
Attachment C.
Table 1
Renton Walmart Expansion – Trip Generation Summary
New Trips Generated
Time Period In Out Total
Weekday Daily 87 86 173
Weekday AM Peak Hour 4 4 8
Weekday PM Peak Hour 7 7 14
As shown in Table 1, the proposed expansion of the existing Walmart is estimated to generate 173 new
weekday daily trips with 8 new trips occurring during the weekday AM peak hour and 14 new trips occurring
during the weekday PM peak hour.
Conclusion
The City of Renton Traffic Impact Analysis Policy Guidelines for New Development includes a 20 peak hour
trip threshold for the requirement of a traffic study. Because the project is estimated to generate less than 20
new weekday AM or PM peak hour trips, a traffic study would not be required for the proposed project per
city guidelines.
If you have any questions regarding the information presented in this memo, please call me at (425) 250-
5003 or email me at chin@tenw.com
cc: Ryan James, P.E., Galloway
Jeff Weeder, Galloway
Jeff Schramm, TENW Principal
Attachments
Updated Trip Generation Memo
Renton Walmart Expansion
ATTACHMENT A
Site Vicinity
Updated Trip Generation Memo
Renton Walmart Expansion
ATTACHMENT B
Preliminary Site Plan
Updated Trip Generation Memo
Renton Walmart Expansion
ATTACHMENT C
Trip Generation Calculations
ITE
Land Use Unit s1 LUC2 In Out Trip Rate2 In Out Tot al
Daily
Proposed Use:
Free-Standing Discount Superst ore 4,547 GFA 813 50%50%50.70 116 115 231
Pass-By Trips 3 25%-29 -29 -58
Net New Dai l y Tr i ps = 87 86 173
AM Peak Hour
Proposed Use:
Free-Standing Discount Superst ore 4,547 GFA 813 56%44%1.85 4 4 8
Pass-By Trips 3 0%0 0 0
Net New AM Peak Hour Tr i ps = 4 4 8
PM Peak Hour
Proposed Use:
Free-Standing Discount Superst ore 4,547 GFA 813 49%51%4.33 10 10 20
Pass-By Trips 3 29%-3 -3 -6
Net New PM Peak Hour Tr i ps = 7 7 14
Not es:
1. GFA = Gross Floor Area.
2. Inst it ut e of Transport at ion Engineers, Tri p Generat ion Manual , 10t h Edit i on.
3. Pass-by percent based on st udi es document ed in t he ITE Tri p Generat i on Handbook , 3rd Edi t ion. No AM pass-by dat a av ailable.
Directional
Dist ribution Trips Generat ed