HomeMy WebLinkAboutERC_Notice_191217DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT
Planning Division
1055 South Grady Way, 6th Floor | Renton, WA 98057 | 425-430-7200, ext. 2
www.rentonwa.gov
OF ENVIRONMENTAL DETERMINATION
ISSUANCE OF A DETERMINATION OF
NON-SIGNIFICANCE - MITIGATED (DNS-M)
POSTED TO NOTIFY INTERESTED PERSONS OF AN ENVIRONMENTAL ACTION
DNSM: THE CITY OF RENTON ENVIRONMENTAL REVIEW COMMITTEE (ERC) HAS DETERMINED THAT THE PROPOSED
ACTION HAS PROBABLE SIGNIFICANT IMPACTS THAT CAN BE MITIGATED THROUGH MITIGATION MEASURES.
DATE OF NOTICE OF ENVIRONMENTAL
DETERMINATION:
December 17, 2019
PROJECT NAME/NUMBER: PR19-000453 Heather Downs Detention Pond WQ
Retrofit / LUA19-000293
PROJECT LOCATION: NE corner of SE 4th St and Union Ave SE (APN
3211100010)
APPLICANT/PROJECT CONTACT
PERSON:
Ken Srilofung / 1055 S Grady Way, Renton, WA 98057 /
ksrilofung@rentonwa.gov
LOCATION WHERE APPLICATION MAY
BE REVIEWED:
Applicant documents are available online through the City of Renton
Document Center website. See also http://bit.ly/32Oq5GH
PROJECT DESCRIPTION: The applicant, the City of Renton, is requesting Environmental (SEPA) Review
in order to convert an existing "back-up" type detention pond to a "flow-through" combination wetpond/detention pond
in order to improve the quality of water discharging into the Maplewood Creek. The site of the existing facility is within
a parcel (APN 3211100010) at the north-east corner of the intersection of Union Ave SE and SE 4th St. The parcel is
located in the R-6 zone and is approximately 8,400 sq. ft. in size. The site abuts single-family homes to the north and
east. The facility, which was constructed in 1983, provides flow control for approximately 29.8 acres of surrounding
residential properties. The existing pond provides little to no water quality treatment and primary functions as a back -
up pond rather than a flow-through-type pond. Water in the pond currently drains into a pipesystem that outfalls to
Maplewood Creek and eventually the Cedar River. Objectives of the proposed project include improving water quality
treatment performance and ensuring the pond meets the Washington Department of Ecology's standards for
stormwater facilities. Additional work may include limited vegetation and tree removal and replacement of an existing
fence around the facility. The applicant submitted a design report prepared by Loius Berger that includes hydrology and
geological analyses. Two preferred alternatives analyzed in depth in the report. Alternative 1 would create a two-cell
pond with an access road that divides the cells and provide 0.14 ac-ft of new wetpond storage, while Alternative 2 would
create a one-cell pond with a standard access road and would provide 0.17 ac-ft of new wetpond storage. Based on
factors including cost, wetpond storage capacity, and ease of construction, the report concludes that Alterative 2 is
preferable. The total construction cost was estimated at $409,000, part of which would be funded via a Department of
Ecology grant. The applicant intends to complete the project in the summer of 2021. A Wellhead Protection Area Zone
2 is present on the site according to COR maps.
Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on December 31, 2019,
together with the required fee with: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057.
Appeals to the Examiner are governed by City of RMC 4-8-110 and information regarding the appeal process may be
obtained from the Renton City Clerkâs Office, (425) 430-6510.
PUBLIC HEARING: If the Environmental Determination is appealed, a public hearing will be set and all parties notified.
NOTICE