HomeMy WebLinkAboutSR_ERC_Report_Purelander_SFR_and_ADU_241203_FinalDEPARTMENT OF COMMUNITY
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SR_ERC_Report_Purelander SFR and ADU_241203_Final
ENVIRONMENTAL REVIEW COMMITTEE REPORT
ERC Meeting Date: December 9, 2024
Project File Number: PR24-000069
Project Name: Purelander Critical Areas Variance for Single Family Residence and Accessory
Dwelling Unit Development
Land Use File Number: LUA24-000300, ECF, V-A
Project Manager: Nichole Perry, Associate Planner
Owner/Applicant: Yin Yin Leong, 11626 SE 61st Pl, Bellevue, WA 98006
Contact: Bill Granger, Re-Align Environmental, 14056 180th Ave SE, Renton, WA 98059
Project Location: 1828 NE 20th St, Renton, WA 98056 (APN 3343903201)
Project Summary: The applicant is requesting SEPA Environmental Review and a Reasonable Use
Variance to allow encroachment into a wetland buffer to provide property access
for constructing a two-story single-family home and accessory dwelling unit at 1828
NE 20th St, Renton, WA 98056 (APN 3343903201). The 1.15-acre parcel is located in
the Residential-4 (R-4) zoning district and is designated Residential Low Density
(RLD) in the Comprehensive Plan. The City of Renton (COR) Map has identified
moderate landslide hazards, wetland, and a Wellhead Protection Area Zone 1
Modified and Zone 2 on the subject site. The COR Map also lists two code
compliance cases (C06-0578 and C06-0704) on the property with the previous
owners for illegal fill of the wetland. There is very limited information on these cases
as to how much of the wetland was disturbed. It appears that a gravel driveway was
put in. However, the new property owners are going through the Variance process
and ensuring all environmental aspects have been evaluated through SEPA Review.
Due to the buffer encroachment, a detailed wetland mitigation plan has been
proposed to enhance and restore buffer areas to maintain ecological functions.
Exist. Bldg. Area SF: Vacant lot (remnant
concrete pad)
Proposed New Bldg. Area (footprint):
Proposed New Bldg. Area (gross):
5,287 sq. ft.
5,287 sq. ft.
Site Area: 1.15 acres Total Building Area GSF: 5,287 sq. ft.
STAFF
RECOMMENDATION:
Staff Recommends that the Environmental Review Committee issue a
Determination of Non-Significance with Mitigation DNS-M.
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 2 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
ENVIRONMENTAL REVIEW
In compliance with RCW 43.21C.240, the following environmental (SEPA) review addresses only those project
impacts that are not adequately addressed under existing development standards and environmental regulations.
A. Environmental Threshold Recommendation
Based on analysis of probable impacts from the proposal, staff recommends that the Responsible
Officials:
Issue a DNS-M with a 14-day appeal period.
B. Mitigation Measures
1. The applicant shall comply with the recommendations outlined in the Geotechnical Evaluation Report,
prepared by Pioneer Engineers, Inc., dated December 30, 2023 (Exhibit 8) and the Supplemental
Geotechnical Report, dated April 15, 2024 (Exhibit 9), and any future addenda.
2. The applicant shall comply with the Tree Retention/Planting Plan and Wetland Enhancement Plan,
prepared by LDC, dated July 22, 2024 (Exhibit 5), including invasive species removal and replanting with
native vegetation within the wetland buffer to achieve a 3.3:1 mitigation ratio and to ensure the protection
of retained trees and successful replanting efforts.
3. The applicant shall prepare and submit an Inadvertent Discovery Plan (IDP) prior to the start of any ground-
disturbing activities. The applicant shall provide notification to Tribes’ cultural committee prior to the start
of construction.
C. Exhibits
Exhibit 1: Environmental Review Committee (ERC) Report
Exhibit 2: Floor Plans, prepared by CHC Architects, dated May 2, 2024
Exhibit 3: Grading, Paving and Drainage Plans, prepared by C2MY Engineers, dated June 21, 2024
Exhibit 4: Utilities, Water and Sewer Plan, prepared by C2MY Engineers, dated June 10, 2024
Exhibit 5: Tree Retention/Planting Plan and Wetland Enhancement Plan, prepared by LDC, dated
July 22, 2024
Exhibit 6: Level 1 Tree Assessment, prepared by Pacific Arboriculture, dated July 21, 2024
Exhibit 7: Drainage Technical Report, prepared by C2MY Engineers, LLC., dated May 29, 2024
Exhibit 8: Geotechnical Evaluation Report, prepared by Pioneer Engineers, Inc., dated December
30, 2023
Exhibit 9: Supplemental Geotechnical Report, prepared by Pioneer Engineers, Inc., dated April 15,
2024
Exhibit 10: Letter of Understanding for Geologic Risk, prepared by the property owner Yin Yin
Leong, dated June 17, 2024
Exhibit 11: Critical Areas Report, prepared by Re-Align Environmental, dated November 20, 2023
Exhibit 12: Addendum #1 – Critical Areas Report, prepared by Re-Align Environmental, dated
February 2, 2024
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 3 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
Exhibit 13: Critical Area Easement Description, prepared for by Eastside Consultants, Inc., dated
July 9, 2024
Exhibit 14: SEPA Environmental Checklist, prepared by Re-Align Environmental, dated September
2023
Exhibit 15: Construction Mitigation Description
Exhibit 16: Duwamish Tribe Comments, prepared by Duwamish Tribal Historic Preservation, dated
October 22, 2024
Exhibit 17: Public Comment Letter(s) and Staff responses from three (3) community members
D. Environmental Impacts
The proposal was circulated and reviewed by various City Departments and Divisions to determine whether
the applicant has adequately identified and addressed environmental impacts anticipated to occur in
conjunction with the proposed development. Staff reviewers have identified that the proposal is likely to have
the following probable impacts:
1. Earth
Impacts: The 1.15-acre subject property at 1828 NE 20th St is currently vacant, with remnants of a
concrete pad on-site. The applicant proposes grading and excavation to prepare the site for the
construction of a two-story single-family residence, an accessory dwelling unit, and the redevelopment
of an existing driveway.
According to the Geotechnical Evaluation Report, prepared by Pioneer Engineers, Inc., dated December
30, 2023 (Exhibit 8), subsurface conditions were explored on December 20, 2023, through four (4) test
pits to a maximum depth of 10 feet (10’). Test pit locations were determined based on existing surface
features, as illustrated in Figure 2. Subsurface exploration was monitored by a professional engineer
from Pioneer Engineers Inc. (PEI), who logged soil and groundwater conditions, observed site features,
and documented transitions in subsurface stratigraphy.
The subsurface soils encountered during the exploration were consistent across the test pits. An eight
to ten-inch (8-10”) layer of topsoil was underlain by tan-brown, silty fine sand, followed by medium-
dense recessional outwash consisting of light-brown fine to medium sand with trace silt, coarse gravel,
and occasional cobbles. The deeper layers transitioned to light-gray, medium to coarse sand with
coarse gravel, indicative of cleaner, coarser recessional outwash material. These findings, visually
classified using the Unified Soil Classification System (USCS) and referenced in the USDA Soil Texture
Triangle, are detailed in Figures 3, 4, and 5.
Groundwater seepage was observed in test pits at depths of seven to nine feet (7-9’) below the surface,
consistent with seasonal fluctuations. These conditions indicate the need for stabilization measures
during and after construction to prevent erosion and maintain site stability..
Grading and excavation activities are expected to involve cut-and-fill operations to create level building
pads and stable foundations. The geotechnical report recommends performing grading during the dry
season to reduce erosion risks. Recommendations include performing grading during the dry season,
using silt fencing, erosion control blankets, and straw mulch to stabilize disturbed areas and control
sedimentation.
In addition, the geotechnical report also confirms that the site’s soils, particularly the recessional
outwash, are suitable for supporting lightweight structures and can bolster stormwater infiltration
capabilities. However, the stability of the driveway, protection of critical tree root zones, and
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 4 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
minimization of encroachment into the wetland buffer require additional measures. These measures
are outlined in the Tree Retention/Planting Plan and Wetland Enhancement Plan, prepared by LDC,
dated July 22, 2024 (Exhibit 5).The Supplemental Geotechnical Report (Exhibit 9) evaluates seismic risks
and concludes that liquefaction potential is low, provided the project adheres to the 2021 International
Building Code (IBC). The site’s designation as Site Class D under the IBC necessitates compliance with
design parameters to ensure structural integrity. As such, staff recommends a mitigation measure that
the applicant comply with the recommendations found in the submitted Geotechnical Evaluation
Report, prepared by Pioneer Engineers, Inc., dated December 30, 2023, and the Supplemental
Geotechnical Report, dated April 15, 2024 and any future addenda.
Mitigation Measures:
The applicant shall comply with the recommendations outlined in the Geotechnical Evaluation Report,
prepared by Pioneer Engineers, Inc., dated December 30, 2023 (Exhibit 8), and the Supplemental
Geotechnical Report, dated April 15, 2024 (Exhibit 9), as well as any future addenda. These measures
include performing grading during the dry season to reduce erosion risks and using erosion control
measures, such as silt fencing, straw mulch, and erosion control blankets, to stabilize disturbed areas
and control sedimentation. Structural stabilization shall be implemented as specified in the
geotechnical reports, including measures to address seismic risks consistent with the 2021
International Building Code (IBC).
✓ Additionally, the applicant shall adhere to the Tree Retention/Planting Plan and Wetland Enhancement
Plan, prepared by LDC, dated July 22, 2024 (Exhibit 5), to ensure protection of critical tree root zones
and minimize encroachment into the wetland buffer. This includes the removal of invasive species and
replanting with native vegetation as specified in the Wetland Enhancement Plan to support ecological
stability.
Nexus: State Environmental Policy Act (SEPA) Environmental Review; City of Renton Comprehensive
Plan Policy L-36; RMC 4-3-050 Critical Areas Regulations; and RMC 4-4-060 Grading, Excavation, and
Mining Regulations.
2. Water
a. Wetland, Streams, Lakes
Impacts: Due to the presence of a wetland on the western and southern portions of the project
site, the applicant submitted a Critical Areas Report, prepared by Re-Align Environmental, dated
November 20, 2023 (Exhibit 11), and an Addendum #1 – Critical Areas Report, prepared by Re-
Align Environmental, dated February 2, 2024 (Exhibit 12). These studies included an analysis of
existing conditions and the potential impacts of the proposed development on the wetland and its
associated buffer.
The wetland has been classified as a Category IV wetland, consistent with the Washington State
Wetland Rating System. The wetland scores six (6) for water quality, five (5) for hydrology, and
three (3) for habitat, for a total score of 14 (a Category IV on the rating form). A Category IV has a
critical area buffer width of 50 feet (50’) and a structure setback beyond the buffer of 15 feet (15’).
Field observations and studies confirm that this wetland is a slope wetland, supported by surface
water runoff and shallow groundwater seepage. The wetland covers 10,050 square feet onsite and
extends an additional 9,100 square feet offsite, resulting in a total wetland area of 19,150 square
feet. The wetland provides limited hydrological functions, including sediment trapping and minor
stormwater retention. Vegetation within the wetland and its buffer is heavily impacted by invasive
species, such as Himalayan blackberry and reed canarygrass, which dominate the buffer and
reduce its ecological value and habitat complexity.
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 5 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
The proposed development includes the construction of a 4,549 square-foot single-family
residence and a 738 square-foot accessory dwelling unit, as shown in the Floor Plans, prepared by
CHC Architects, dated May 2, 2024 (Exhibit 2). Both proposed structures are located outside the
wetland and its buffer. However, the existing driveway, which provides access to the site,
encroaches into the 50-foot (50’) wetland buffer and requires redevelopment to meet current
standards. The Grading, Paving, and Drainage Plans, prepared by C2MY Engineers, dated June 21,
2024 (Exhibit 3), show that driveway redevelopment would impact approximately 0.14 acres of the
wetland buffer. Grading would be confined to the existing impervious surface footprint to minimize
further encroachment and the applicant is proposing to use permeable pavement for the driveway
to reduce stormwater runoff impacts. Additionally, stormwater treatment systems, such as
biofiltration swales or infiltration trenches, are planned to ensure that runoff from the driveway
does not degrade the wetland buffer or downstream water quality. As compensation for the buffer
impact, the applicant is proposing enhancement of the 0.23-acre wetland in order to increase plant
diversity and to improve wildlife forage opportunities in the wetland, including the removal of
invasive species and replanting with native vegetation, such as Pacific willow, black cottonwood,
and salmonberry, to restore the wetland buffer. Restoration of the remaining 0.23-acre buffer area
outside of the driveway is also being proposed as part of the Tree Retention/Planting Plan and
Wetland Enhancement Plan. All restoration work would follow the five-year monitoring and
maintenance plan to ensure the establishment of native vegetation and the removal of invasive
regrowth. Therefore, staff is recommending a mitigation measure that the applicant comply with
the Tree Retention/Planting Plan and Wetland Enhancement Plan, prepared by LDC, dated July 22,
2024, including invasive species removal and replanting with native vegetation within the wetland
buffer to achieve a 3.3:1 mitigation ratio and to ensure the protection of retained trees and
successful replanting efforts.
Mitigation Measures: The applicant shall comply with the Tree Retention/Planting Plan and
Wetland Enhancement Plan, prepared by LDC, dated July 22, 2024, including invasive species
removal and replanting with native vegetation within the wetland buffer to achieve a 3.3:1
mitigation ratio and to ensure the protection of retained trees and successful replanting efforts.
Nexus: State Environmental Policy Act (SEPA) Environmental Review; RMC 4-3-050 Critical Areas
Regulations; and RMC 4-4-130 Tree Retention and Land Clearing Regulations.
b. Ground Water
Impacts: The City of Renton (COR) mapping system identifies the subject property as being located
within Wellhead Protection Area Zones 1 Modified and Zone 2. No construction work is proposed
within the Downtown Wellhead Protection Zone 1. However, construction activities, including
grading and excavation, may result in potential groundwater interactions due to the site’s shallow
water table, as documented in the Geotechnical Evaluation Report, prepared by Pioneer Engineers,
Inc., dated December 30, 2023 (Exhibit 8), and the Supplemental Geotechnical Report, prepared
by Pioneer Engineering, Inc., dated April 15, 2024 (Exhibit 9). Groundwater seepage was observed
in test pits at depths of seven to nine feet (7-9’), consistent with seasonal fluctuations.
Open conveyance systems or infiltration facilities designed to manage stormwater may require
liners to protect groundwater quality, as stipulated in the 2022 Renton Surface Water Design
Manual. These measures are critical to prevent contamination of wellhead protection zones.
Furthermore, the City of Renton’s grading and excavation regulations require that imported fill
exceeding 50 cubic yards within Wellhead Protection Zone 1 or 100 cubic yards within Zone 2 be
accompanied by a source statement certified by a qualified professional or confirmed as originating
from a Washington State Department of Transportation (WSDOT) approved source.
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 6 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
To minimize impacts on groundwater recharge areas, Best Management Practices (BMPs) for
stormwater control are outlined in the Grading, Paving, and Drainage Plans, prepared by C2MY
Engineers, dated June 21, 2024 (Exhibit 3). These BMPs include measures such as sediment traps,
stormwater filters, and temporary erosion control blankets, which are designed to prevent
sedimentation and protect water quality.
Mitigation Measures: None recommended.
Nexus: Not applicable.
c. Storm Water
Impacts: The proposed development would add approximately 13,822 square feet of new and
replaced impervious surfaces, triggering Full Drainage Review under the 2022 Renton Surface
Water Design Manual (RSWDM). According to the Drainage Technical Report, prepared by C2MY
Engineers, LLC., dated May 29, 2024 (Exhibit 7), stormwater runoff generated by the new
impervious surfaces would be managed using infiltration systems designed to meet Core and
Special Requirements outlined in the RSWDM.
The Grading, Paving, and Drainage Plans, prepared by C2MY Engineers, dated June 21, 2024
(Exhibit 3), propose the use of permeable pavement for the driveway and infiltration trenches
located outside the wetland buffer to mitigate stormwater impacts. These features are designed
to enhance groundwater recharge while reducing runoff. Stormwater from the driveway
turnaround would be treated with a proprietary treatment system or a biofiltration swale, ensuring
compliance with city water quality standards.
To further mitigate stormwater impacts, the project includes flow control devices designed to
reduce peak discharge rates and prevent downstream flooding. These features ensure that the
development does not contribute to localized or downstream drainage issues. Public comments
(Exhibit 17) did not identify specific concerns related to stormwater. However, staff reviewed the
stormwater design plans and determined that the proposed measures comply with city standards
for flow control and water quality treatment. It is anticipated that the requirements set forth by
the 2022 City of Renton Surface Water Design Manual (2022 RSWDM), or a future stormwater
manual adopted by the City of Renton, would be sufficient to mitigate stormwater impacts
generated by the proposed development and no specific mitigation measures are recommended.
Mitigation Measures: None recommended.
Nexus: Not applicable.
3. Vegetation
Impacts: The proposed development would require the removal of vegetation within the wetland
buffer to accommodate the construction of the driveway and associated grading activities. According
to the Tree Retention/Planting Plan and Wetland Enhancement Plan, prepared by LDC, dated July 22,
2024 (Exhibit 5), the project site contains 28 trees, of which 13 would be retained. The trees to be
removed are located within the wetland buffer or along the alignment of the existing driveway. Tree
removal is necessary to improve site access while minimizing additional encroachment into the
wetland buffer.
The wetland buffer is currently dominated by invasive vegetation, including Himalayan blackberry and
reed canarygrass, which have reduced its ecological functions, contributed to soil erosion, and limited
native species establishment. The Wetland Enhancement Plan proposes removing invasive vegetation
and replanting native species, such as Pacific willow, black cottonwood, and salmonberry, to improve
habitat quality, stabilize soils, and enhance the wetland buffer’s ecological functions.
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 7 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
Mitigation measures outlined in the Tree Retention/Planting Plan and Wetland Enhancement Plan
would restore vegetation within the wetland buffer, resulting in improved habitat conditions and
alignment with city standards. These measures aim to balance vegetation removal with significant
restoration efforts to support long-term ecological health.
Public comments (Exhibit 17) raised concerns about vegetation removal and its potential impacts on
habitat quality. However, staff determined that the proposed mitigation plan meets or exceeds city
requirements and is expected to result in long-term environmental benefits, including increased
habitat complexity, soil stabilization, and improved buffer functionality. Staff is recommending that
the applicant comply with the Tree Retention/Planting Plan and Wetland Enhancement Plan to ensure
the protection of retained trees and successful replanting efforts. See mitigation measure above under
“Water.” No further mitigation is being proposed.
Mitigation Measures: None recommended.
Nexus: Not applicable.
4. Wildlife
Impacts: The proposed development is expected to cause temporary disturbances to wildlife during
construction activities, including noise, vibrations, and human presence. According to the Critical Areas
Report, prepared by Re-Align Environmental, dated November 20, 2023 (Exhibit 11), and Addendum
#1 – Critical Areas Report, dated February 2, 2024 (Exhibit 12), the project site provides limited habitat
for wildlife due to the dominance of invasive species within the wetland buffer. Observed species
include black-tailed deer, eastern gray squirrels, crows, robins, and other suburban-adapted wildlife
commonly found in developed areas.
No threatened or endangered species were identified within the site boundaries. The proposed Tree
Retention/Planting Plan and Wetland Enhancement Plan, prepared by LDC, dated July 22, 2024 (Exhibit
5), includes the restoration of degraded buffer areas through the removal of invasive species and the
replanting of native vegetation, such as Pacific willow, black cottonwood, and salmonberry. These
efforts are expected to improve the quality of wildlife habitat over time by providing forage, cover, and
nesting opportunities, thus enhancing the overall ecological value of the wetland buffer.
Public comments (Exhibit 17) expressed concerns about the impact of vegetation removal on wildlife
habitat. However, staff reviewed the proposed mitigation measures and determined that the planned
restoration would adequately address habitat degradation. The improvements to the buffer area are
expected to result in long-term benefits for wildlife by increasing habitat complexity and supporting
diverse species. Staff is recommending that the applicant comply with the Tree Retention/Planting Plan
and Wetland Enhancement Plan to ensure the protection of retained trees and successful replanting
efforts. See mitigation measure above under “Water.” No further mitigation is being proposed.
Mitigation Measures: None recommended.
Nexus: Not applicable.
5. Historic and Cultural Preservation
Impacts: The project site is located within the ancestral lands of the Duwamish people. According to
the SEPA Environmental Checklist, prepared by Re-Align Environmental, dated September 2023
(Exhibit 14), no known cultural or archaeological resources are currently documented on the property.
However, the Department of Archaeology and Historic Preservation (DAHP) and the Duwamish Tribal
Historic Preservation Office have identified the area as culturally significant with a moderate
probability of encountering unknown archaeological deposits due to its proximity to historical
waterways and cultural landmarks.
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
City of Renton Department of Community & Economic Development
Purelander Critical Areas Variance for a Single-Family Residence and
Accessory Dwelling Unit Development
Staff Report to the Environmental Review Committee
LUA 24-000300, ECF, V-A
Report of December 9, 2024 Page 8 of 8
SR_ERC_Report_Purelander SFR and ADU_241203_Final
The Duwamish Tribe submitted a comment letter (Exhibit 16) emphasizing the cultural importance of
the area and recommending an Inadvertent Discovery Plan (IDP), especially for activities disturbing
native soils below fill or impervious surfaces. The Tribe also highlighted the presence of four historical
and ancestral Duwamish place names within approximately one mile of the site and noted that DAHP’s
WISAARD predictive model advises an archaeological survey due to a high risk of encountering cultural
resources. Additionally, the Tribe expressed concerns about potential impacts to mature native trees,
which they consider culturally significant, and recommended their preservation where possible. The
Tribe supports the use of native vegetation for landscaping, removal of invasive species, and dark-sky-
compliant lighting to reduce light pollution and preserve favorable conditions for traditional practices.
Staff notes the applicant has already proposed replanting with native vegetation according to the Tree
Retention/Planting Plan and Wetland Enhancement Plan (Exhibit 5). As such, staff recommends as a
mitigation measure that the applicant prepare and submit an Inadvertent Discovery Plan (IDP) prior to
the start of any ground-disturbing activities. The applicant shall provide notification to Tribes’ cultural
committee prior to the start of construction.
Mitigation Measures: The applicant shall prepare and submit an Inadvertent Discovery Plan (IDP) prior
to the start of any ground-disturbing activities. The applicant shall provide notification to Tribes’
cultural committee prior to the start of construction.
Nexus: State Environmental Policy Act (SEPA) Environmental Review; RCW 27.53 Archaeological Sites
and Resources; RCW 27.44 Indian Graves and Records; and City of Renton Comprehensive Goals and
Policies, L-AA, L-45, and L-46.
The proposal has been circulated to City Department and Division Reviewers. Where applicable, their
comments have been incorporated into the text of this report and/or “Advisory Notes to Applicant.”
✓ Copies of all Review Comments are contained in the Official File and may be attached to this report.
The Environmental Determination decision will become final if the decision is not appealed within the 14-day
appeal period (RCW 43.21.C.075(3); WAC 197-11-680).
Environmental Determination Appeal Process: Appeals of the environmental determination must be filed in
writing on or before 5:00 p.m. on December 23, 2024. Appeals must be submitted electronically to the City Clerk
at cityclerk@rentonwa.gov or delivered to City Hall 1st floor Lobby Hub Monday through Friday. The appeal fee,
normally due at the time an appeal is submitted, will be collected at a future date if your appeal is submitted
electronically. The appeal submitted in person may be paid on the first floor in our Finance Department. Appeals
to the Hearing Examiner are governed by RMC 4-8-110 and additional information regarding the appeal process
may be obtained from the City Clerk’s Office, cityclerk@rentonwa.gov.
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7
CITY OF RENTON
DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT
STAFF REPORT TO THE ENVIRONMENTAL REVIEW COMMITTEE
EXHIBITS
Project Name:
Purelander Critical Areas Variance for Single Family
Residence and Accessory Dwelling Unit Development
Land Use File Number:
LUA24-000300, ECF, V-A
Date of Meeting:
December 9, 2024
Staff Contact:
Nichole Perry
Associate Planner
Project Contact:
Bill Granger, Re-Align
Environmental, 14056 180th
Ave SE, Renton, WA 98059
Project Location:
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The following exhibits are included with the ERC Report:
Exhibit 1: Environmental Review Committee (ERC) Report
Exhibit 2: Floor Plans, prepared by CHC Architects, dated May 2, 2024
Exhibit 3: Grading, Paving and Drainage Plans, prepared by C2MY Engineers, dated June 21, 2024
Exhibit 4: Utilities, Water and Sewer Plan, prepared by C2MY Engineers, dated June 10, 2024
Exhibit 5: Tree Retention/Planting Plan and Wetland Enhancement Plan, prepared by LDC, dated
July 22, 2024
Exhibit 6: Level 1 Tree Assessment, prepared by Pacific Arboriculture, dated July 21, 2024
Exhibit 7: Drainage Technical Report, prepared by C2MY Engineers, LLC., dated May 29, 2024
Exhibit 8: Geotechnical Evaluation Report, prepared by Pioneer Engineers, Inc., dated December
30, 2023
Exhibit 9: Supplemental Geotechnical Report, prepared by Pioneer Engineers, Inc., dated April 15,
2024
Exhibit 10: Letter of Understanding for Geologic Risk, prepared by the property owner Yin Yin
Leong, dated June 17, 2024
Exhibit 11: Critical Areas Report, prepared by Re-Align Environmental, dated November 20, 2023
Exhibit 12: Addendum #1 – Critical Areas Report, prepared by Re-Align Environmental, dated
February 2, 2024
Exhibit 13: Critical Area Easement Description, prepared for by Eastside Consultants, Inc., dated
July 9, 2024
Exhibit 14: SEPA Environmental Checklist, prepared by Re-Align Environmental, dated September
2023
Exhibit 15: Construction Mitigation Description
Exhibit 16: Duwamish Tribe Comments, prepared by Duwamish Tribal Historic Preservation, dated
October 22, 2024
Exhibit 17: Public Comment Letter(s) and Staff responses from three (3) community members
Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7