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STATE OF WASHINGTON
DEPARTMENT OF ECOLOGY
Northwest Region Office
PO Box 330316, Shoreline, WA 98133-9716 • 206-594-0000
August 31, 2022
Clark Close, Principal Planner
Planning Division
City of Renton
1055 South Grady Way
Renton, WA 98057
Re: Renton Retail Park
File# PR22-000235/LUA22-000291, Ecology SEPA# 202204178
Dear Clark Close:
Thank you for the opportunity to provide comments on the State Environmental Policy Act
(SEPA) notice of application utilizing the optional determination of non-significance
(ODNS/NOA) process for the Renton Retail Park project. Based on review of the checklist
associated with this project, the Department of Ecology (Ecology) has the following comments:
Section B, Environmental Elements; Subsection 3, Water; Subsection b, Ground Water:
Groundwater was observed as shallow as 4 feet below ground surface (bgs). Is dewatering
anticipated during soil removal and construction? If yes, please add information and protocol of
dewatering.
Section B, Environmental Elements; Subsection 7, Environmental Health:
The proposed project is located immediately adjacent to Boeing Renton facility, which is a
cleanup site with a cleanup site ID 820 and facility site ID 2097.
In subsection 7 (a)(1), it indicates that "At one time, the presence of vinyl chloride in
groundwater and soil gas was documented. Recently, additional soil, groundwater, and soil-gas
sampling was performed, which revealed no presence of VOC’s (including vinyl chloride) above
Model Toxics Control Act (MTCA) screening levels."
Due to the close proximity to the Boeing Renton facility, please provide contingency actions in
the event if subsurface work encounter soil and/or groundwater contamination. The
contingency actions should include mitigation measures to address the following:
Response: Revised Construction Mitigation Description as requested.
Clark Close
August 31, 2022
Page 2
Hazardous waste operations worker training, health/safety plan, and site control
requirements, per WAC 296-843.
Management of contaminated soil encountered during excavations, including
sampling, containment, and disposal at a permitted facility.
Management of contaminated ground water, if encountered, including sampling,
containment, and disposal at a permitted facility.
Thank you for considering these comments from Ecology. If you have any questions or would
like to respond to these comments, please contact Jing Song from the Toxics Cleanup Program
at (425) 229-2565 or by email at jing.song@ecy.wa.gov.
Sincerely,
Kelli Sheldon
SEPA Coordinator
Sent by email: Clark Close, cclose@rentonwa.gov
ecc: Jing Song, Ecology
Response: Revised Construction Mitigation Description as requested.