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PUBLIC WORKS DEPARTMENT
M E M O R A N D U M
DATE: December 1, 2020
TO: Jill Ding, Senior Planner
FROM: Amanda Pierce, Surface Water Utility Engineer
CC: Becca Ochiltree, BHC Consultants
Will Rus so, Kleinfelder
SUBJECT: Burnett and Williams Water Quality Retrofit Project - Site Investigation
The Burnett and Williams Water Quality Retrofit Project is proposed to take place within the City
of Renton requiring a Critical Areas Exemption and Shoreline Exemption. As part of the
exemption process, certain application materials are required and attached.
Project Narrative
The City of Renton Public Works Surface Water Utility has a design project under contract to
design improvements for the exis ting storm water infrastructure and design water quality devices
for retrofit. The project site is located from Burnett Ave S to Williams Ave S, and S 2 nd Street to
the Cedar River. This project requires site and subsurface exploration to characterize subs urface
soil conditions , support project engineering, and prepare permits . The project proposes to drill
four hollow-stem auger borings to log standard penetration test blow counts and collect soil
samples for analysis. The borings will be advanced to betwe en 20 to 30 feet below the existing
ground surface and may utilize a slurry to combat soil heave. Boring holes will be backfilled
according to Washington State regulations using bentonite pellets; the volume of spoils
generated from drilling is less than 10 CY of material. The project area encompasses
approximately 180,000 SF or 4 acres, with approximately 17,400 SF within critical areas and
regulated shoreline.
The site exploration activity is seeking a shoreline exemption based on site exploration and
investigation activities that are prerequisite to permit preparation. The activity does not interfere
with normal public use of the surface waters, has no significant adverse impact on the
environment, the activity does not involve the installation of any st ructure and will be restored to
conditions prior to activity. The anticipated dates of work are D ecember 7th, 2020 through March
1st, 2021.
The project is located on land used for public right-of -way, public parks , and public trails.
Coordination with Ci ty of Renton Parks Department has been made to obtain a right -of-entry
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permit. Coordination with City of Renton Community and Economic Development for a right -of -
way permit.
The area is also located within the following critical areas: Sensitive slopes , s pecial flood hazard
areas, seismic hazard areas, high intensity regulated shoreline, and wellhead protection area
zone 1. There will be assessments on wetlands, a stream study, biological assessment, and critical
areas assessment to determine pertinent information such as the ordinary high water mark and
critical habitats . The work will facilitate a geotechnical report to get a better understanding of the
geologic risk of the area. The work does not impact drainage or require re -grading at this time, as
the surface will be returned to existing conditions. The soil and drainage conditions are to be
assessed based on the feasibility study to mitigate potential hazards. As this project is in design
and not a construction project, there is no construction or market value associated. The borings
and site exploration will not require the removal of any trees or land clearing. The existing
shoreline is defined as high intensity which is suitable for public or private access.
Attachments
Land Use Permit Master App lication Form
Waiver Form
Neighborhood Detail Map
Site Plan
Shoreline Exemption