HomeMy WebLinkAboutERC_DNS-M_Determination_Applicant_Ltr_200617
June 22, 2020
Mark Clement
The Boeing Company
PO Box 3707, MC 66-102
Seattle, WA 98124
SUBJECT: ENVIRONMENTAL THRESHOLD (SEPA) DETERMINATION
Boeing Apron A Stormwater Upgrade, LUA20-000093, ECF, SSDP
Dear Mr. Clement:
This letter is written on behalf of the Environmental Review Committee (ERC) to advise you that they have
completed their review of the subject project and have issued a threshold Determination of Non-Significance-
Mitigated with Mitigation Measures. Please refer to the enclosed ERC Report, for a list of the Mitigation
Measures.
Appeals of the environmental determination must be filed pursuant to RMC 4-9-070.R. Please refer to the
enclosed ERC Report and Decision for more details. If you have any questions or desire clarification of the above,
please call me at (425) 430-7219.
For the Environmental Review Committee,
Alex Morganroth
Senior Planner
Enclosure
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
Project Location Map
ERC REPORT LUA18-000293
ENVIRONMENTAL REVIEW COMMITTEE REPORT
ERC MEETING DATE: June 22, 2020
Project File Number: PR20-000115, ECF, SSDP
Project Name: Boeing Apron A Stormwater Upgrade
Land Use File
Number:
LUA20-000093
Project Manager: Alex Morganroth, Senior Planner
Owner: The City of Renton, 1055 S Grady Way, Renton, WA 98057
Applicant/Contact: Mark Clement, PO Box 3707, MC 66-102, Seattle, WA 98124
Project Location: 616 W Perimeter Road, Renton, WA 98054
Project Summary: The applicant is requesting a Shoreline Substantial Development Permit and
Environmental (SEPA) Review for a utilities upgrade project at 616 W Perimeter Rd, the
Renton Municipal Airport (0723059007). The site is zoned IM - Medium Industrial and
is located in the Employment Area (EA) Comprehensive Plan Land Use designation.
Apron A is located on the eastern side of the airport property along the west bank of
the Cedar River. The site is located within the Shoreline Jurisdiction of the Cedar River,
Reach A, designated as Shoreline High Intensity. The applicant has proposed various
storm water conveyance system upgrades for the W-1 parking lot on Apron A as well as
the aircraft stall areas (stalls A1-A7) including the installation of 625 linear feet of new
conveyance pipe, six modular wetlands, and seven storm drainage catch basins. The
project would also include the installation of new spill containment valves, an oil/water
separator, and spill diversion system near the A7 aircraft stall area. No above-ground
structures are proposed as part of the project. Utility replacement work would occur
approximately 40 feet from the Cedar River OHWM at the closest point. No new
impervious surface would be added to the area and no trees and/or existing vegetation
would be removed as a result of the proposed project. The applicant provided a Stream
Study, Drainage Report, and Geotechnical Report with the application.
Exist. Bldg. Area SF: N/A Proposed New Bldg. Area (footprint)
Proposed New Bldg. Area (gross):
N/A
N/A
Site Area: 6,640,721 SF (153.2 acres) Total Building Area GSF: N/A
STAFF
RECOMMENDATION:
Staff Recommends that the Environmental Review Committee issue a Determination
of Non-Significance – Mitigated (DNS-M).
DocuSign Envelope ID: AD7CAF2A-ED12-4A88-ACD2-89EFB0E3A881
City of Renton Department of Community & Economic Development Environmental Review Committee Report
BOEING APRON A STORMWATER UPGRADE PROJECT LUA20-000093, ECF, SSDP
Report of June 22, 2020 Page 2 of 6
ERC REPORT LUA20-000093
PART ONE: 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
B. Mitigation Measures
1. The applicant shall comply with the recommendations of the geotechnical report prepared by S&EE, dated
March 20, 2020, or an updated report submitted at a later date.
2. If any Native American grave(s) or archaeological/cultural resources (Indian artifacts) are found all
construction activity shall stop in accordance with RCW 27.53.060 and 27.44.020, and the
owner/developer shall immediately notify the City of Renton planning department, concerned Tribes’
cultural committees, and the Washington State Department of Archeology and Historic Preservation.
3. The applicant shall submit an Archaeological Monitoring and Inadvertent Discovery Plan MIDP to DAHP
and any interested Tribes for review prior to the start of any ground disturbing activities. Documentation
of the submittal shall be provided to the City of Renton prior to the issuance of building or construction
permits.
C. Exhibits
Exhibit 1: Environmental Review Committee (ERC) Report
Exhibit 2: Site Plan
Exhibit 3: Grading Plan
Exhibit 4: Construction Mitigation Description
Exhibit 5: Drainage Report, prepared by DOWL, dated March, 2020
Exhibit 6: Conceptual Drainage/Utilities Plan, prepared by DOWL, dated March 2020
Exhibit 7: Geotechnical Report, prepared by S&EE, dated March, 2020
Exhibit 8: Stream Study, prepared by Wood Environmental and Infrastructure Solutions, dated
March 31, 2020
Exhibit 9: Potential Levy Impact Letter, prepared by S&EE, dated March 19, 2020
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 subject site is located in an area with a known seismic hazard. As such the applicant submitted
a Geotechnical Report, prepared by S&EE, dated March, 2020 (Exhibit 7). The analysis in the report primarily
focused on the area within Apron A where new stormwater improvements are proposed. S&EE relied on the
soil characteristics observed in prior geotechnical reports prepared for Boeing for work on Apron A, as well
as new laboratory testing of a soil borings collected near the proposed work.
DocuSign Envelope ID: AD7CAF2A-ED12-4A88-ACD2-89EFB0E3A881
City of Renton Department of Community & Economic Development Environmental Review Committee Report
BOEING APRON A STORMWATER UPGRADE PROJECT LUA20-000093, ECF, SSDP
Report of June 22, 2020 Page 3 of 6
ERC REPORT LUA20-000093
Similar to the results of previous borings near the site, the new borings found fill approximately three to
eight feet (3’-8’) in thickness primarily consisting of loose sand with gravel. Native alluvial soils with varying
degrees of density then extend approximately 100 feet below the fill. Older alluvial soils consisting of
medium dense to dense sand, silt and silty clay were found up to a depth of between 150 and 170 feet.
S&EE estimates that the depth of the groundwater is approximately four to seven feet below the ground
surface and is likely to fluctuate due to Apron A’s close proximity to the river.
According to the City of Renton Critical Areas Maps, the project site is located in a seismic hazard area. The
submitted geotechnical report concluded that the project site is located in an area of high liquefaction
potential due the close proximity to the Seattle Fault. Even with the high potential for liquefaction near the
project area during an earthquake, the report finds the use of a conventional spread concrete footings to be
acceptable for any light-weight structures associated with the project (i.e. small utility structures). Due to
the close proximity to the river and high saturation potential of the soil, S&EE also makes recommendations
regarding the temporary excavations required during construction including recommendations on slope
angle and shoring methods. Lastly, the report makes a number of recommendations on the repaving of the
apron area including proof-rolling before pouring new concrete in order to find soft spots, introduction of
woven geotextile for subgrade stabilization, and the use of particular asphalt pavement types that would be
most appropriate for the soil on the site.
Due to the inclusion of specific recommendations provided in the geotechnical report, staff recommends as
a mitigation measure that the applicant comply with the recommendations in the provided report or an
updated report submitted with the construction permit. The geotechnical report would be required to be
submitted with the construction permit application for the utility work and compliance with the
recommendations would be reviewed at that time.
The applicant has indicated the project would result in approximately 21,745 square feet of replaced
impervious area. The project would not increase the impervious coverage on-site overall.
Mitigation Measures: The applicant shall comply with the recommendations of the geotechnical report
prepared by S&EE, dated March 20, 2020, or an updated report submitted at a later date.
Nexus: SEPA Environmental Review, RMC 4-4-060 Grading, Excavation and Mining Regulations
2. Air
Impacts: It is anticipated that some temporary air quality impacts could be associated with site work and
building construction required to complete the proposed project at this site. Project development impacts
during construction activities may include dust as a result of concrete replacement and utility work, as well
as exhaust from construction vehicles, equipment and/or machinery. These emissions would be temporary
and are anticipated to rapidly dissipate. Dust control would be mitigated through the use of temporary
erosion control measures, watering or other best management practices as identified in the construction
mitigation memo provided by the applicant (see Exhibit 4).
No further site specific mitigation is recommended for the identified impacts from typical vehicle and
construction exhaust.
Mitigation Measures: No further mitigation recommended.
Nexus: N/A
3. Water
a. Storm Water
Impacts: The applicant submitted a Preliminary Drainage Plan and Technical Information Report (TIR)
prepared by DOWL, dated March 20, 2020 (Exhibit 8). The project contains greater than 2,000 square feet of
replaced impervious surface and therefore the development is subject to Full Drainage Review in accordance
with the 2017 Renton Surface Water Design Manual (RSWDM). Based on the City of Renton’s flow control
DocuSign Envelope ID: AD7CAF2A-ED12-4A88-ACD2-89EFB0E3A881
City of Renton Department of Community & Economic Development Environmental Review Committee Report
BOEING APRON A STORMWATER UPGRADE PROJECT LUA20-000093, ECF, SSDP
Report of June 22, 2020 Page 4 of 6
ERC REPORT LUA20-000093
map, the site falls within the Peak Rate Flow Control Standard area matching Existing Site Conditions and is
within the Lake Washington and Cedar River Drainage Basin. All nine core requirements and the six special
requirements have been discussed in the TIR.
The project site is located within the Lake Washington and Cedar River drainage basin. The flowpath from the
project site discharge point is less than a half mile to the 100-year floodplain of Lake Washington; therefore,
the project qualifies for the direct discharge exemption in accordance with Section 1.2.3.1 of the 2017 RSWDM
and must adhere to all requirements thereof.
The project is classified as a redevelopment project in accordance with the definition of redevelopment
project provided in the RSWDM. As a redevelopment project, the project is exempt from Core Requirement
#8 – Water Quality as it meets the exemption criteria outlined in Section 1.2.8 of the RSWDM - #3 Cost
Exemption for Parcel Redevelopment Projects. However, the applicant has elected to provide enhanced water
quality treatment prior to discharge in order to provide a benefit to Lake Washington and its aquatic habitat.
Project water quality treatment will consist of surface water conveyance to oil/water separator vaults, which
will direct surface water to several Linear Modular Wetland systems prior to discharge to the outfalls in Lake
Washington.
A Construction Stormwater General Permit from Department of Ecology will be required if grading and
clearing of the site exceeds one acre. A Stormwater Pollution Prevention Plan (SWPPP) is required for this site.
b. Wetlands, Streams, Lakes
Impacts: The project site is located along the western shore of the Cedar River, a Shoreline of the State. Reach
A of the Cedar River Shoreline is designated as High Intensity at the project location. Due to the utility work
being located within 200 feet of the OHWM of the Cedar River, the applicant prepared a Standard Stream
Study Narrative prepared by Wood Infrastructure and Environmental Solutions and dated March 31, 2020
(Exhibit 8). The submitted report identified existing riparian and aquatic conditions in the area directly
adjacent to the proposed utility work on Apron A. Due to the channeling of the river and highly-developed
nature of both river banks, the report states that the extremely limited riparian areas near the project site
likely provide little ecological function. The report concludes that regardless of how the areas function, work
on the proposed project would occur outside of these narrow riparian areas and are unlikely to impact the
Cedar River’s aquatic or riparian habitats.
The proposed project would be confined to the airport property and no trees or riparian vegetation would be
removed. No new lighting is proposed as part of the project and no components of the subject project would
occur below the OHWM of the Cedar River. According to the consultant, the project would result in no net
loss of ecological function in either the Cedar River’s riparian zone or aquatic zone within 100 feet upstream
and downstream of the project site. In addition, the applicant submitted a Construction Mitigation Description
that identifies erosion control best practices that would be utilized to prevent contaminants from entering
the river (Exhibit 4). Therefore based on the finding of no net loss of ecological functions from the consultant
and proposed erosion control measures, staff does not recommend any specific mitigation measures related
to impacts to the Cedar River.
Mitigation Measures: No further mitigation required.
Nexus: Not applicable
4. Wildlife
Impacts: According to the Environmental Checklist submitted by the applicant, the project is located in an
area of threatened species under the Endangered Species Act, the Puget Sound Chinook salmon and Puget
Sound steelhead trout. The utility work proposed would occur as close as 20 feet away from the Cedar River
OHWM, a distance within the 200 foot shoreline buffer. Based on the Standard Stream Study Narrative
submitted by the applicant (Exhibit 8), no net loss of ecological function is anticipated as a result of the project.
According to the report, the no net loss determination is primarily a result of the developed nature of the site
DocuSign Envelope ID: AD7CAF2A-ED12-4A88-ACD2-89EFB0E3A881
City of Renton Department of Community & Economic Development Environmental Review Committee Report
BOEING APRON A STORMWATER UPGRADE PROJECT LUA20-000093, ECF, SSDP
Report of June 22, 2020 Page 5 of 6
ERC REPORT LUA20-000093
and nearby river bank, the lack of vegetation removal in the proposal, and the fact that no new lighting is
proposed.
Mitigation Measures: None
Nexus: N/A
5. Historic and Cultural Preservation
Impacts: In the SEPA checklist the applicant indicated that they completed a search of the Washington
State Information System of Architectural and Archaeological Records Data. The Checklist concludes that
the system did not identify any properties within the project area as being on the historic property inventory
or register.
The northern portion of the airport was once under the surface of Lake Washington. In addition the Black
River used to run out of the lake, flow south through the airport and then west. Based on the probability of
the subject site being along the banks of an old river channel and lake shore there is a higher likelihood of
cultural resources discovery, through ground disturbing activity. As such, staff recommends as a mitigation
measure that if any Native American grave(s) or archaeological/cultural resources (Indian artifacts) are
found all construction activity shall stop in accordance with RCW 27.53.060 and 27.44.020, and the
owner/developer shall immediately notify the City of Renton planning department, concerned Tribes’
cultural committees, and the Washington State Department of Archeology and Historic Preservation. The
SEPA checklist indicates that if any archaeological resources are encountered a professional Archaeologist
would be called to assess the significance of the find.
Due to parts of the proposed project that would occur under the existing pervious surface, the applicant is
recommended to hire a professional archeologist to monitor ground disturbing activities. In addition, the
applicant shall prepare an archaeological monitoring and inadvertent discovery plan (MIDP) to be submitted
to DAHP and the interested Tribes for review prior to any ground disturbance.
Mitigation Measures:
1. If any Native American grave(s) or archaeological/cultural resources (Indian artifacts) are found all
construction activity shall stop in accordance with RCW 27.53.060 and 27.44.020, and the
owner/developer shall immediately notify the City of Renton planning department, concerned Tribes’
cultural committees, and the Washington State Department of Archeology and Historic Preservation.
2. The applicant shall submit an Archaeological Monitoring and Inadvertent Discovery Plan MIDP to
DAHP and any interested Tribes for review prior to the start of any ground disturbing activities.
Documentation of the submittal shall be provided to the City of Renton prior to the issuance of
building or construction permits.
Nexus: SEPA Environmental Review, RCW 27.53 Archaeological Sites and Resources, and RCW 27.44 Indian
Graves and Records.
E. Comments of Reviewing Departments
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 listed under Exhibit 10 “Plan Review Comments to
Applicant.”
Copies of all Review Comments are contained in the Official File and may be attached to this report.
DocuSign Envelope ID: AD7CAF2A-ED12-4A88-ACD2-89EFB0E3A881
DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT
Planning Division
1055 South Grady Way, 6th Floor | Renton, WA 98057 | 425-430-7200, ext. 2
www.rentonwa.gov
PLEASE FOLLOW THE DOCUMENT CENTER LINK TO SEE ASSOCIATED PROJECT DOCUMENTS.
IF YOU NEED ADDITIONAL ASSISTANCE YOU MAY CONTACT THE CITY OF RENTON,
DEPARTMENT OF COMMUNITY & ECONOMIC DEVELOPMENT AT (425) 430-7200, EXT. 2.
PLEASE INCLUDE THE PROJECT NUMBER WHEN CALLING FOR PROPER FILE IDENTIFICATION.
OF ENVIRONMENTAL DETERMINATION
ISSUANCE OF A DETERMINATION OF NON-SIGNIFICANCE (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:
June 22, 2020
PROJECT NAME/NUMBER: PR20-000115 Boeing Apron A Stormwater Upgrade/
LUA20-000093, ECF, SSDP
PROJECT LOCATION: 301 E Perimeter Rd (APN 0723059007)
APPLICANT/PROJECT CONTACT PERSON: Mark Clement, The Boeing Company / Mark Clement, PO Box 3707, MC 66-
102, Seattle, WA 98124 / mark.d.clement@boeing.com / 206-617-2944
LOCATION WHERE APPLICATION MAY BE
REVIEWED:
Applicant documents are available online through the City of Renton
Document Center website. See also https://bit.ly/2VcZBhC
PROJECT DESCRIPTION: The applicant, the Boeing Company, is requesting a Shoreline Substantial
Development Permit and Environmental (SEPA) Review for a utilities upgrade project at 616 W Perimeter Rd, the Renton
Municipal Airport (0723059007). The site is zoned IM - Medium Industrial and is located in the Employment Area (EA)
Comprehensive Plan Land Use designation. Apron A is located on the eastern side of the airport property along the Cedar
River. The site is located within the Shoreline Jurisdiction of the Cedar River, Reach A, designated as Shoreline High
Intensity. The applicant has proposed various storm water conveyance system upgrades for the W-1 parking lot on Apron
A as well as the aircraft stall areas (stalls A1-A7) including the installation of 625 linear feet of new conveyance pipe, six
modular wetlands, and seven storm drainage catch basins. The project would also include the installation of new spill
containment valves, an oil/water separator, and spill diversion system near the A7 aircraft st all area. No above-ground
structures are proposed as part of the project. Utility replacement work would occur approximately 40 feet from the
Cedar River OHWM at the closest point. No new impervious surface would be added to the area and no trees and/or
existing vegetation would be removed as a result of the proposed project. The applicant provided a Stream Study,
Drainage Report, and Geotechnical Report with the application.
When the DNS-M becomes appealable, the appeal period will be 14 days.
NOTICE
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
SIGNATURES:
Martin Pastucha, Administrator
Public Works
Date Rick M. Marshall, Administrator
Renton Regional Fire Authority
Date
for
for
Kelly Beymer, Administrator
Community Services Department
Date Cliff Long, Econ. Dev. Director Date
Interim CED Administrator
Interim Chair
ENVIRONMENTAL (SEPA) DETERMINATION OF
NON-SIGNIFICANCE - MITIGATED (DNS-M)
PROJECT NUMBER: PR20-000115
APPLICANT: Mark Clement, The Boeing Company /Mark Clement, PO Box 3707, MC 66-102,
Seattle, WA 98124 / mark.d.clement@boeing.com
PROJECT NAME: Boeing Apron A Stormwater Upgrade
PROJECT DESCRIPTION: The applicant, the Boeing Company, is requesting a Shoreline Substantial
Development Permit and Environmental (SEPA) Review for a utilities upgrade project at 616 W Perimeter Rd, the Renton
Municipal Airport (0723059007). The site is zoned IM - Medium Industrial and is located in the Employment Area (EA)
Comprehensive Plan Land Use designation. Apron A is located on the eastern side of the airport property along the Cedar
River. The site is located within the Shoreline Jurisdiction of the Cedar River, Reach A, designated as Shoreline High
Intensity. The applicant has proposed various storm water conveyance system upgrades for the W-1 parking lot on Apron
A as well as the aircraft stall areas (stalls A1-A7) including the installation of 625 linear feet of new conveyance pipe, six
modular wetlands, and seven storm drainage catch basins. The project would also include the installation of new spill
containment valves, an oil/water separator, and spill diversion system near the A7 aircraft stall area. No above-ground
structures are proposed as part of the project. Utility replacement work would occur approximately 40 feet from the Cedar
River OHWM at the closest point. No new impervious surface would be added to the area and no trees and/or existing
vegetation would be removed as a result of the proposed project. The applicant provided a Stream Study, Drainage
Report, and Geotechnical Report with the application.
PROJECT LOCATION: 301 E Perimeter Rd (APN 0723059007)
LEAD AGENCY: City of Renton
Environmental Review Committee
Department of Community & Economic Development
The City of Renton Environmental Review Committee has determined that it does not have a probable significant adverse
impact on the environment. An Environmental Impact Statement (EIS) is not required under RCW 43.21C.030(2)(c).
Conditions were imposed as mitigation measures by the Environmental Review Committee under their authority of
Section 4-9-070D Renton Municipal Code. These conditions are necessary to mitigate environmental impacts identified
during the environmental review process. When the DNS becomes appealable, the appeal period will be 14 days.
DATE OF DECISION: June 22, 2020
DocuSign Envelope ID: AD7CAF2A-ED12-4A88-ACD2-89EFB0E3A881
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